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October 24, 2018

WHAT YOU NEED TO KNOW BEFORE YOU PURCHASING LED DISPLAYS?

LED Sign Basics

We can see LED display everywhere,but what is the determined factor for its price,do you think of ot before youbuying one? there are 3 industry terms for LED signs you need to understand.

  • Pixel
  • Pitch
  • Matrix

The individual LEDs are are grouped together in what is known as a 'pixel'. The number of LEDs in each pixel varies. There could be one LED or there could be 25 LEDs in one pixel.

The major factor which determines the number of LEDs in a pixel is the 'pitch' of the pixels in the LED sign. The pitch is the distance from the center of one pixel to the center of the next pixel. The pitch determines how crisp the image will be.

If there are 2 LED signs sitting side by side and each one is the same height and width but they have different pitches, the LED sign with the smaller, tighter pitch, will have more pixels and thus a better resolution.

Selecting the right pitch when you are purchasing an LED sign may save you money as well as getting you the appropriate resolution for your particular application so make sure you read the section on choosing the right size LED sign.

The third term is 'matrix'. The matrix is made up of the number of pixel high and the number of pixels wide of an LED sign is. The matrix is what determines the physical size of the sign. If an LED sign is 24 pixels tall and 96 pixels wide, the matrix is 24x96.

With monochrome led signs and with an indoor led sign, the matrix determines how many lines of text you can put on the sign as well as how many characters will fit on each line. With programmable color LED signs the matrix determines how much total space you have. A quick word or caution, having the correct height to width ratio is CRITICAL in color LED signs, you should always consult an LED sign professional for help determining the best matrix for a color LED sign.

So to sum it up...

  • Groups of LEDs make Pixels
  • The distance between pixels, the pitch, determines the resolution
  • The number of vertical and horizontal pixels determines the matrix which determines the number of lines in the sign and the number of charcters per line.

Color or Monochrome?

The first question you need to ask yourself is do I need a color LED sign or Outdoor Electronic Monochrome LED Displays. Most sign salesmen will tell you that a color LED sign is more effective. I'm not one of those guys. Color can be more effective for some applications but not all applications. The only thing you can say about color LED Displays that is true for every application is that it is more expensive than monochrome LED signs.

So how do you know if the additional cost is justified? Ask yourself this question: "Can my product or service be sold with a picture?".

If you sell insurance there are probably no pictures that will help you sell your product, words will sell your product.

If you sell cars you can definately sell your product with pictures.

If you answered "No" then properly sized Monochrome Electronic LED Signs are probably the way to go. A properly sized monochrome LED sign is just as, if not more, effective as a color LED sign if picures and video are not helpful. You will also save a bundle in aquiring the sign.

If you answered yes, you should consider a color LED sign. They do cost more but if images can help you sell, the additional cost might be justified. Talk to an LED sign professional for help determining if a color LED sign is the way to go.

How big should my LED display be?

Properly answering this requires a careful review of the location for the sign as well as the specific application. If you talk to a sign salesperson who does not inspect your property and ask questions about your application, be very wary, they are probably more interested in making a sale than in making sure you get the right LED sign.

There are several factors that must be considered. For instance:

  • Speed Limit of Traffic
  • Lanes of Traffic
  • Stop signs or Stop lights
  • Viewing Distance
  • Sign Height/Elevation
  • Content

And the list goes on.

Of all the items listed above, content is the most involved. If you are getting a monochrome LED sign you need to know what you want to say AND the most effective way to say it. Then you must consider the traffic patterns. The speed limit and viewing distance will affect the the viewing time. Your towns sign ordinance can also have an impact here.

Once you have all that information (actually you need more information than that but those are the basics) you can determine your matrix (scroll back up for a review of what the matrix is).

Now you need to determine the correct pitch. A smaller/tighter pitch will make the minimum character size smaller.

So, if your LED sign will be viewed from a long distance by people in cars travelling 45mph you will need a larger character size to make sure the traffic can read it. That means you will need a larger pitch.

If your sign will be close to the traffic and the speed limit is 25mph you can use a small character size, and smaller pitch, and your message will still be readable.

Determining the matrix and the pitch is even more complicated if you are getting a color LED sign because you must carefully consider the application as well as the aspect ratio.

As a rule of thumb, with color LED Displays, the smaller the matrix and the larger the pitch, the grainier the picture on the LED sign will be.

Viewing distance also plays a role in how high of a resolution you need. If the LED sign will be viewed from a long distance you do not need as much fine detail. The closer the viewer is to the LED sign, the more detail you need. You must carefully consider what kind of content you will putting on the LED sign and the viewing distance.

If all of this seems complicated and possibly a bit overwhelming, don't worry, that is what we are here for. We have a process for going over all the details of your location and application. Then, and only then, we will make a recommendation to you.

Remember, if your LED sign is too big, you wasted money. If your LED Display is too small, you wasted money. Only a properly sized LED sign will give you the most bang for your buck (also known as the best ROI).

Things to watch out for when purchasing an LED sign

The true cost of an LED Display is in the number of individual LEDs in the sign. The size of the box housing the LEDs isn't really important when it comes to pricing, in fact, that box is relatively inexpensive. The circuit boards which control the LED sign aren't the key factor in pricing, like the box they are relatively inexpensive. The key factor is the number of LEDs in the sign.

If you are considering acquiring an LED sign that is 32 pixels high and 96 pixels long and you are looking at two different brands which appear to be almost identical, even the pricing is close, which LED sign is the better bargain? There is one key piece of information you need to start to answer that question: How many LEDs are in each pixel?

Remember, pixels are groups or clusters of individual LEDs. The LED sign in this example has 3072 PIXELS (32 pixels high x 96 pixels wide). If one brand has 8 LEDs in each pixel than you are getting 24,576 LEDs. If the other brand only has 4 LEDs per pixel you are getting 12,288 LEDs.

LED density is a good indicator for comparing LED display performance. Just like your car's engine, more cylinders generally mean more power. More LEDs per pixel generally mean higher brightness and better performance. A low brightness, unreadable LED display will not help you increase your sales because it's less likely your customers will notice and read what you have to say.

The answer is probably getting pretty clear. More LEDs equals more brightness, more clarity, more attention, more customers.

The number of LEDs per pixel is also important because of degradation. Generally speaking, an LED diode will lose about 20% of its initial brightness after the first 2000 hours of use (about 3 months). After that, the LED's brightness degrades very slowly until it dies at the estimated lifetime of 100,000 hours (about 11 years). When shopping for an LED sign, it is important to keep in mind that the manufacturer's claimed display brightness will drop about 20% after 2 to 3 months of operation.

Another consideration is the viewing angle of the sign. LEDs can put out a single, narrow beam of light like a flashlight, or they can put out a wide beam across a room like a light bulb. LEDs put out about the same amount of light no matter what type they are - but the "high-beam" LEDs with a narrow angle focus more light into one small spot, whereas the "wide angle" LEDs spread their light across the horizon. So, if you were to stand in front of a sign made from "high-beam" LEDs with narrow viewing angles, you would see an extremely bright sign, as long as you stood directly in front of it, but the minute you walked away from the front of the sign, where the "high beam" is focused, you would see nothing but black.

With wide viewing angle LEDs, the image is visible in consistent brightness and uniform colors throughout the entire viewing range of the display. A quality LED sign will have 140� of viewing angle which maintains the highest color accuracy and extends reading times.

There are 3 ways to build LED signs.

The first is to solder the LEDs directly to the circuits boards AND put a plexiglass face over the LED sign face to weatherproof it. There are several drawbacks to this method. First the plexiglass shield will cause glare from the sun which will make your sign harder to read during the day. Second, beacuse the LEDs are soldered to the circuit board. If one LED goes out you sign has to be turned off, opened up, and an entire board must be replaced. This will cause a quilting effect in your sign where one section is brighter then the surrounding areas.

The second, and next best method, is to solder the LEDs directly to the circuit board but seal the entire face of the sign, without a plexiglass face shield. This eliminates the sun glare problem but it still has all the other drawbacks of the first method.

The third, and best, method is to use individually sealed pixels. With this method each pixel can be removed individually without turning off and opening the sign. This eliminates all the drawbacks of the other two methods.

Your biggest hurdle in buying an LED sign

The biggest thing to watch out for is sign sales people. I am not saying they are dishonest, most of them are very honest, hard working people. Most of them also lack the experience and/or knowledge to properly size and program an LED sign. They are expert tradesmen who really know how to build and install signs but LED signs have special issues that require special expertise.

Make sure that whoever you are dealing with is an expert at properly sizing and programming LED signs.

If they do not take the time to roll up their sleeves and really dig into your application and circumstances you need to be very wary of them. An LED sign is not a one size fits all, one phone call, purchase. They require careful planning and consideration. Do yourself a favor and talk to a professional.

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October 05, 2018

HOW TO CHOOSE THE IDEAL AND SUITABLE LED SCREEN?

With the gradual maturity of LED industry technology, LED display screen has been widely used in shopping malls, indoor and outdoor sports venues, airports and high-speed railway passenger information system display, and so on, widely favored by the public. Demand for LED displays has soared, and manufacturers are competing to sell them. The quality and price of LED displays on the market are uneven and far apart. Customers themselves lack the ability to distinguish the LED display. It makes the shoppers at a loss. So what should we pay attention to when we buy LED display screen?

Step one: refresh rate
Smartphones, with stripes of water ripple against the lighted LED display, indicate a low refresh rate.

The second step: consistency.
See to see the display effect of lighting the screen, see whether the screen is even, there are color blocks, indicating poor consistency.
The third step: defend the grayscale.
Look at the gradient to open the gray detection tool, see whether the gray gradient is smooth, right brighter than left is normal, otherwise it shows that there is a gray problem.

The fourth step: brightness.
The suitable LED display screen is not the brighter the better, the outdoor non-sunny choice brightness (> 4000CD/M2), outdoor sunny choice brightness (> 5000CD/M2), indoor pursuit of low brightness (> 600CD/M2) can be.

The fifth step: Approach
Watch the ghost to open the detection tool, close to see whether there are ghosts on the display screen, the screen with ghost phenomenon seems unclear.

The sixth step: purchase
Choose a big brand to buy LED display screen, the pre-sale, sale, after-sales requirements are very high, do not be greedy for small and cheap, choose a big brand to have a reliable service guarantee. Choose a supplier with strength and word of mouth to purchase.

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September 28, 2018

THE INFLUENCE OF LED BEADS ON THE SMALL PIXEL PITCH HD LED SCREEN

1. The influence of lamp beads on the brightness of LED display screen with small spacing

The brightness of micro-distance LED display depends on the current flowing into the LED beads and the brightness function of the LED beads themselves. The higher the applied current of LED beads, the greater the luminous brightness of micro-distance LED display screen. Excellent quality LED beads have outstanding light conversion rate. Minimal applied current can announce high luminous light, which has advantages of saving power consumption and maintaining the stability of micro-distance LED display screen.

2. Effect of lamp beads on runaway rate of LED display with small spacing

Because the micro-distance LED display screen is composed of tens of thousands or even hundreds of thousands of sets of red, green and blue LED pixels, the failure of any color LED will affect the overall visual effect of the display screen. Generally speaking, according to industry experience, the loss of power should not be more than three-tenths of ten thousand before the LED display is installed 72 hours after aging, and the loss of power of high-quality LED beads is very low. The runaway rate of micro-distance LED display with high-quality LED beads can be controlled in 100,000 parts. One is below.

3.The influence of lamp beads on the life of LED display screen with small spacing

The theoretical life of LED beads is 100,000 hours, which is much longer than the working life of other parts of micro-distance LED display screen. Therefore, only the quality assurance of LED beads, suitable working current, reasonable PCB heat dissipation planning and careful production process of the display screen are needed. LED beads will be one of the most useful components in the whole display screen, and the micro-selection of high-quality LED beads is needed. The service life of the LED display can reach 100,000 hours and the MTBF can reach 50,000 hours.

4. Effect of lamp beads on viewing angle of LED display with small spacing

The angle of micro distance LED display is decided by the angle of LED bead. Nowadays, indoor display screen mostly uses LED beads with horizontal or straight view angle, which makes the level/straight view point of micro-distance LED display reach 160 degrees of view angle.

5. Influence of lamp beads on pixel distance of LED display screen with small spacing

The size of the LED bead affects the pixel distance and the whole screen resolution of the LED display. SMD0707 LED beads are mainly used with the micro-distance LED display below P1.5, SMD1010 LED beads are mainly used for P1.6, P1.9, P2.0 micro-distance LED display, SMD2121 LED beads are mainly used for P2.5, P3 micro-distance LED display. On the premise of unchanged point distance, LED beads can increase the size of the display area, reduce the sense of particles, but because of the black area reduction, will reduce the contrast; on the contrary, LED beads reduce the scale, reduce the display area, increase the sense of particles, increase the area of the black area, add contrast.

6. Effect of lamp beads on luminance / chroma / white balance consistency of small spacing LED display screen

Micro-distance LED display is composed of numerous red, green and blue LED pixels. The consistency of brightness and wavelength of each color LED determines the brightness consistency, white balance consistency and chroma consistency of the whole display screen. Generally speaking, display manufacturers require equipment suppliers to supply 5nm wavelength and 1:1.3 luminance LED beads, which can be graded by equipment suppliers through spectrophotometer. Because LED beads have viewpoints, micro-distance LED displays have the same viewpoint orientation, that is, when viewed from different viewpoints, their brightness will increase or decrease. In this way, the view consistency of red, green and blue LED will seriously affect the consistency of the white balance of different viewpoints, and directly affect the fidelity of the video color of the display screen. To achieve the matching consistency of the brightness changes of red, green and blue LEDs at different viewpoints, it is necessary to make strict scientific planning on the packaging lens planning and raw material selection, which depends on the technical level of packaging suppliers. If the normal direction white balance of the display is better, if the LED beads'viewpoint consistency is not good, the whole screen white balance effect of different viewpoints will be bad. The viewpoint consistency characteristics of LED beads can be measured by an integrated LED viewpoint tester, especially for medium and advanced display screens.

7. The influence of lamp beads on the static electricity of LED screen screen with small spacing.

LED lamp beads are semiconductor devices, sensitive to static electricity, very easy to lead to static failure, so anti-static ability to the life of the display is very important. High quality LED beads can satiate 50Hz, 1500V (AC RMS) test voltage for 1 minute without insulation breakdown.

8. Effect of lamp beads on attenuation characteristics of LED display with small spacing

LED display after a long period of work will show a decline in brightness and display color is not consistent with the phenomenon, mainly because of the brightness of the LED beads caused by attenuation. The attenuation of LED bead brightness will result in the decrease of the whole screen brightness. Red, green, blue LED brightness fluctuations will form the inconsistency of LED display color, which is what we often say the phenomenon of display screen spent. High quality LED beads can control brightness attenuation. According to the standard of 1000 hours room temperature lighting 20mA, red attenuation should be less than 2%, blue and green attenuation should be less than 10%, so blue and green LED in the display screen planning as far as possible do not use 20 mA current, it is best to use only 70% to 80% of the rated current. The attenuation characteristics are related to the characteristics of red, green and blue LEDs, but the attenuation is affected by the current, PCB board heat dissipation planning and the operating environment temperature of the display screen.

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September 27, 2018

THE IMPORTANT PARAMETERS OF LED DISPLAY

With the continuous development of the economy and society, the application range of LED displays has become more and more extensive. Whether you are walking in the streets or in the bustling city square and high-end entertainment venues, you can see the LED display. Following is LED Display Parameter Description.

Pixel

It is the smallest unit that can be independently controlled on the screen. PIXEL is an abbreviation of pictureelement. On a three-color screen, pixels consist of three parts: red, green, and basket. Each part consists of one or several leds. Theoretically, they are individually adjusted. The brightness of red, green and blue can be expressed in any color.

Pitch

The distance between the centers of adjacent pixels. The smaller the distance, the shorter the viewing distance.

Resolution

Usually used for digital display devices, representing the total number of pixels, generally written in a wide X high form, such as 800X600.

Viewing angle

The maximum brightness that can be seen when the observer is facing, when the viewer moves to the left or right, the brightness is reduced, and when the brightness is reduced to half of the maximum brightness, the angle at this time is added to the The sum of the angles obtained by moving in the opposite direction is called the horizontal viewing angle and the vertical viewing angle is measured in the same manner. The perspective manufacturers will give parameters.

Brightness

Brightness is the most important parameter in any display device. The main unit of brightness is called candela, which is represented by CD. The brightness of a single LED is usually millicarandelas, MCD, ie one thousandth of a CD, and the brightness of one square meter of LEDs is added together to obtain the brightness per unit area. NITS says 1 NITS=1 CD/m2

Visual distance

For various LED displays, the best viewing distance should be the smallest distance that the human eye can't distinguish between pixels. This distance is about 3400 times the distance between points. The viewing distance between TV and computer is usually less than this requirement, but the acceptable distance can not be less than 1700 times the distance between points.

Picture update rate/refresh rate

The rate at which the screen image is updated, usually expressed in Hertz (Hz), is different from the frame rate.

Frame rate

The number of image frames displayed per second on the screen, usually depends on the input signal (25fpsforPAL, 30fpsforNTSC)

Field frequency

Half frame of PAL and NTSC, because PAL and NTSC are interlaced scanning, only reveal the half frame picture every refresh.

Pure green and true green

In the past 30 years, various colors of LEDs have been successively developed. First, red, yellow, yellow-green, blue LEDs and pure green LEDs were successively invented by Nichia engineers in the 1990s. It is now possible to manufacture LED full-color screens. The video LED screen must use pure green. If you use yellow green, the color is definitely not true. If the number of green tubes in a pixel is more than the number of red and blue tubes, it must be a yellow-green tube, because yellow The brightness of the green is not enough, you must use more than one, but the yellow-green LED is cheap.

Color temperature

The brightness of red, green and blue must be balanced to accurately restore the true color. In other words, the white color of the LED must be white instead of pink. If red, green and blue are all at the highest brightness, the mixed colors are usually not white. In order to get white (usually called 6500K color temperature), one or two of the red, green and blue lights must be turned down. To get the correct white color, you must Measured repeatedly to adjust the brightness, this process called white balance, LED display price.

Grayscale

The number of colors that an LED screen can represent depends on the RGB three-color gray scale. In a standard full-color screen, it is 256 levels of gray. For stadium full-color LED systems, 256 gray levels are not enough to accurately recover Restore color. Also known as color depth, refers to the number of different brightness, red, green and blue have their own grayscale, in a full-color system is generally 256 levels of gray, can produce 256X256X256 = 16,777,216 kinds of colors, called 24-bit color in PC, It is called an 8-bit system in LED display systems.

GAMMA correction

This is a way to reduce the number of gray scales by transforming functions to produce a color and contrast that is closer to the real environment. The actual color of full-color screens is subject to many restrictions. At night, the brightness of the screen body must be reduced. The color will be reduced, therefore, the digital RGB display color is certainly less than the 16M color, in order to solve this problem, you need a higher level of gray, 1Bill color system (red, green and blue 1024 color) can be more realistic color , because from the 256 gray scale expanded to 1024, greatly enriched the number of colors that can be expressed.

Virtual Pixel Technology

Also known as a shared pixel or a dynamic pixel, a pixel that is 4 times the physical pixel is rapidly sent to the physical pixel by parity and even-odd rows. The effect is equivalent to reducing the pitch by half, and the cost is basically the same as the conventional method. Compared to the basic increase, but it can do 4 times the original resolution.

Consistency

The quality of the entire picture largely depends on the consistency of the LED. The problem of consistency is the inherent problem of LEDs when LEDs are produced. Their brightness, viewing angle, and other characteristics are actually not uniform. These parameters are distributed in a certain range. The better the manufacturer's process control, the smaller this range, and the use of LEDs provided by high-quality manufacturers can reduce the workload of debugging. The sensitivity of the human eye to color and brightness is quite high, and the difference between LEDs is easily noticeable, especially in high-brightness display systems. Designers must adopt various techniques to eliminate this difference. , increase consistency, LED display manufacturers.

Color difference

LED large-screen combination of red, green and blue to produce a variety of colors, but these three colors are made of different materials, the viewing angle is different, the spectrum distribution of different LED are changed, these differences can be observed It is color difference. When observing the LED at a certain angle, its color changes, and the ability of the human eye to judge the color of the real picture (such as a movie picture) is better than the picture produced by the observation computer.

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September 13, 2018

THE INFLUENCE OF LED BEADS ON THE SMALL PIXEL PITCH HD LED SCREEN

1. The influence of lamp beads on the brightness of LED display screen with small spacing

The brightness of micro-distance LED display depends on the current flowing into the LED beads and the brightness function of the LED beads themselves. The higher the applied current of LED beads, the greater the luminous brightness of micro-distance LED display screen. Excellent quality LED beads have outstanding light conversion rate. Minimal applied current can announce high luminous light, which has advantages of saving power consumption and maintaining the stability of micro-distance LED display screen.

2. Effect of lamp beads on runaway rate of LED display with small spacing

Because the micro-distance LED display screen is composed of tens of thousands or even hundreds of thousands of sets of red, green and blue LED pixels, the failure of any color LED will affect the overall visual effect of the display screen. Generally speaking, according to industry experience, the loss of power should not be more than three-tenths of ten thousand before the LED display is installed 72 hours after aging, and the loss of power of high-quality LED beads is very low. The runaway rate of micro-distance LED display with high-quality LED beads can be controlled in 100,000 parts. One is below.

3.The influence of lamp beads on the life of LED display screen with small spacing

The theoretical life of LED beads is 100,000 hours, which is much longer than the working life of other parts of micro-distance LED display screen. Therefore, only the quality assurance of LED beads, suitable working current, reasonable PCB heat dissipation planning and careful production process of the display screen are needed. LED beads will be one of the most useful components in the whole display screen, and the micro-selection of high-quality LED beads is needed. The service life of the LED display can reach 100,000 hours and the MTBF can reach 50,000 hours.

4. Effect of lamp beads on viewing angle of LED display with small spacing

The angle of micro distance LED display is decided by the angle of LED bead. Nowadays, indoor display screen mostly uses LED beads with horizontal or straight view angle, which makes the level/straight view point of micro-distance LED display reach 160 degrees of view angle.

5. Influence of lamp beads on pixel distance of LED display screen with small spacing

The size of the LED bead affects the pixel distance and the whole screen resolution of the LED display. SMD0707 LED beads are mainly used with the micro-distance LED display below P1.5, SMD1010 LED beads are mainly used for P1.6, P1.9, P2.0 micro-distance LED display, SMD2121 LED beads are mainly used for P2.5, P3 micro-distance LED display. On the premise of unchanged point distance, LED beads can increase the size of the display area, reduce the sense of particles, but because of the black area reduction, will reduce the contrast; on the contrary, LED beads reduce the scale, reduce the display area, increase the sense of particles, increase the area of the black area, add contrast.

6. Effect of lamp beads on luminance / chroma / white balance consistency of small spacing LED display screen

Micro-distance LED display is composed of numerous red, green and blue LED pixels. The consistency of brightness and wavelength of each color LED determines the brightness consistency, white balance consistency and chroma consistency of the whole display screen. Generally speaking, display manufacturers require equipment suppliers to supply 5nm wavelength and 1:1.3 luminance LED beads, which can be graded by equipment suppliers through spectrophotometer. Because LED beads have viewpoints, micro-distance LED displays have the same viewpoint orientation, that is, when viewed from different viewpoints, their brightness will increase or decrease. In this way, the view consistency of red, green and blue LED will seriously affect the consistency of the white balance of different viewpoints, and directly affect the fidelity of the video color of the display screen. To achieve the matching consistency of the brightness changes of red, green and blue LEDs at different viewpoints, it is necessary to make strict scientific planning on the packaging lens planning and raw material selection, which depends on the technical level of packaging suppliers. If the normal direction white balance of the display is better, if the LED beads'viewpoint consistency is not good, the whole screen white balance effect of different viewpoints will be bad. The viewpoint consistency characteristics of LED beads can be measured by an integrated LED viewpoint tester, especially for medium and advanced display screens.

7. The influence of lamp beads on the static electricity of LED screen screen with small spacing.

LED lamp beads are semiconductor devices, sensitive to static electricity, very easy to lead to static failure, so anti-static ability to the life of the display is very important. High quality LED beads can satiate 50Hz, 1500V (AC RMS) test voltage for 1 minute without insulation breakdown.

8. Effect of lamp beads on attenuation characteristics of LED display with small spacing

LED display after a long period of work will show a decline in brightness and display color is not consistent with the phenomenon, mainly because of the brightness of the LED beads caused by attenuation. The attenuation of LED bead brightness will result in the decrease of the whole screen brightness. Red, green, blue LED brightness fluctuations will form the inconsistency of LED display color, which is what we often say the phenomenon of display screen spent. High quality LED beads can control brightness attenuation. According to the standard of 1000 hours room temperature lighting 20mA, red attenuation should be less than 2%, blue and green attenuation should be less than 10%, so blue and green LED in the display screen planning as far as possible do not use 20 mA current, it is best to use only 70% to 80% of the rated current. The attenuation characteristics are related to the characteristics of red, green and blue LEDs, but the attenuation is affected by the current, PCB board heat dissipation planning and the operating environment temperature of the display screen.

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August 13, 2018

SOME KNOWLEADGE POINTS ABOUT LIGHT SPECTRUM AND PLANT GROWTH

Most of the photosynthetic activity is in the blue and red frequencies.

The amount of photosynthetic activity under each light spectrum 

 

Blue light (430nm-450nm) 
Those wavelengths encourage vegetative growth and are essential in lighting for seedlings and young plants during the vegetative stage of their growth cycle, especially when “stretching” must be reduced or eliminated.  It also stimulates the production of secondary pigments which can enhance colors and is known to also stimulate Terpene (i.e. fragrance) production.

 

Red light (640nm-680nm)
Red light affects phytochrome reversibility and is the most important for flowering and fruiting regulation. These wavelengths encourage stem growth, flowering and fruit production, and chlorophyll production.
The 660nm wavelength has a very strong photosynthetic action and also exhibits the highest action on red-absorbing phytochrome regulated germination, flowering and other processes. Most effective for light cycle extension or night interruption to induce flowering of long-day plants or to prevent flowering of short-day plants.

Green light (500nm-550nm) 
Most green light is reflected off the plant and plays a much smaller role in plant growth. However, there are some important aspects of light in this range so a certain amount of light in this spectrum range is beneficial. Green light is sometimes used as a tool for eliciting specific plant responses such as stomatal control, phototropism, photomorphogenic growth and environmental signaling. When combined with blue, red and far-red wavelengths, green light completes a comprehensive spectral treatment for understanding plant physiological activity. The function of green light is less well understood than the other spectrums, and there are only certain species of plants that require green light for normal growth. It’s effects appear to be very strain specific.

 

Photosynthesis isn't the only light-driven process in plants. Secondary metabolites (compounds) are created in a process called photomorphogenesis, many based on colors of light not used directly for photosynthesis.

 

Ultraviolet light (10nm-400nm) 
Near-UV light is a very important contributor for plant colors, tastes and aromas。
Studies show that 385 nm UV light promotes the accumulation of phenolic compounds, enhances antioxidant activity of plant extracts, but does not have any significant effect on growth processes.  UVB has also been demonstrated to elevate THC levels in Cannabis*

 

Far red (730nm)
Although the 730nm wavelength is outside the photosynthetically active range, it has the strongest action on the far-red absorbing form of phytochrome, converting it back to the red-absorbing form. It becomes necessary for plants requiring relatively low values of the phytochrome photoequilibrium to flower. Can be used at the end of each light cycle to promote flowering in short-day plants such as Cannabis.
Also, a higher ratio of far-red to red than found in sunlight can trigger the shade stretch response- where a plant when sensing it is shaded based on an elevated ratio of far-red to red- will stretch to try to elevate its canopy above its competitors.

 

--Above information are from network.

 

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July 01, 2018

THE IMPORTANT PARAMETERS OF LED DISPLAY

With the continuous development of the economy and society, the application range of LED displays has become more and more extensive. Whether you are walking in the streets or in the bustling city square and high-end entertainment venues, you can see the LED display. Following is LED Display Parameter Description.

Pixel

It is the smallest unit that can be independently controlled on the screen. PIXEL is an abbreviation of pictureelement. On a three-color screen, pixels consist of three parts: red, green, and basket. Each part consists of one or several leds. Theoretically, they are individually adjusted. The brightness of red, green and blue can be expressed in any color.

Pitch

The distance between the centers of adjacent pixels. The smaller the distance, the shorter the viewing distance.

Resolution

Usually used for digital display devices, representing the total number of pixels, generally written in a wide X high form, such as 800X600.

Viewing angle

The maximum brightness that can be seen when the observer is facing, when the viewer moves to the left or right, the brightness is reduced, and when the brightness is reduced to half of the maximum brightness, the angle at this time is added to the The sum of the angles obtained by moving in the opposite direction is called the horizontal viewing angle and the vertical viewing angle is measured in the same manner. The perspective manufacturers will give parameters.

Brightness

Brightness is the most important parameter in any display device. The main unit of brightness is called candela, which is represented by CD. The brightness of a single LED is usually millicarandelas, MCD, ie one thousandth of a CD, and the brightness of one square meter of LEDs is added together to obtain the brightness per unit area. NITS says 1 NITS=1 CD/m2

Visual distance

For various LED displays, the best viewing distance should be the smallest distance that the human eye can't distinguish between pixels. This distance is about 3400 times the distance between points. The viewing distance between TV and computer is usually less than this requirement, but the acceptable distance can not be less than 1700 times the distance between points.

Picture update rate/refresh rate

The rate at which the screen image is updated, usually expressed in Hertz (Hz), is different from the frame rate.

Frame rate

The number of image frames displayed per second on the screen, usually depends on the input signal (25fpsforPAL, 30fpsforNTSC)

Field frequency

Half frame of PAL and NTSC, because PAL and NTSC are interlaced scanning, only reveal the half frame picture every refresh.

Pure green and true green

In the past 30 years, various colors of LEDs have been successively developed. First, red, yellow, yellow-green, blue LEDs and pure green LEDs were successively invented by Nichia engineers in the 1990s. It is now possible to manufacture LED full-color screens. The video LED screen must use pure green. If you use yellow green, the color is definitely not true. If the number of green tubes in a pixel is more than the number of red and blue tubes, it must be a yellow-green tube, because yellow The brightness of the green is not enough, you must use more than one, but the yellow-green LED is cheap.

Color temperature

The brightness of red, green and blue must be balanced to accurately restore the true color. In other words, the white color of the LED must be white instead of pink. If red, green and blue are all at the highest brightness, the mixed colors are usually not white. In order to get white (usually called 6500K color temperature), one or two of the red, green and blue lights must be turned down. To get the correct white color, you must Measured repeatedly to adjust the brightness, this process called white balance, LED display price.

Grayscale

The number of colors that an LED screen can represent depends on the RGB three-color gray scale. In a standard full-color screen, it is 256 levels of gray. For stadium full-color LED systems, 256 gray levels are not enough to accurately recover Restore color. Also known as color depth, refers to the number of different brightness, red, green and blue have their own grayscale, in a full-color system is generally 256 levels of gray, can produce 256X256X256 = 16,777,216 kinds of colors, called 24-bit color in PC, It is called an 8-bit system in LED display systems.

GAMMA correction

This is a way to reduce the number of gray scales by transforming functions to produce a color and contrast that is closer to the real environment. The actual color of full-color screens is subject to many restrictions. At night, the brightness of the screen body must be reduced. The color will be reduced, therefore, the digital RGB display color is certainly less than the 16M color, in order to solve this problem, you need a higher level of gray, 1Bill color system (red, green and blue 1024 color) can be more realistic color , because from the 256 gray scale expanded to 1024, greatly enriched the number of colors that can be expressed.

Virtual Pixel Technology

Also known as a shared pixel or a dynamic pixel, a pixel that is 4 times the physical pixel is rapidly sent to the physical pixel by parity and even-odd rows. The effect is equivalent to reducing the pitch by half, and the cost is basically the same as the conventional method. Compared to the basic increase, but it can do 4 times the original resolution.

Consistency

The quality of the entire picture largely depends on the consistency of the LED. The problem of consistency is the inherent problem of LEDs when LEDs are produced. Their brightness, viewing angle, and other characteristics are actually not uniform. These parameters are distributed in a certain range. The better the manufacturer's process control, the smaller this range, and the use of LEDs provided by high-quality manufacturers can reduce the workload of debugging. The sensitivity of the human eye to color and brightness is quite high, and the difference between LEDs is easily noticeable, especially in high-brightness display systems. Designers must adopt various techniques to eliminate this difference. , increase consistency, LED display manufacturers.

Color difference

LED large-screen combination of red, green and blue to produce a variety of colors, but these three colors are made of different materials, the viewing angle is different, the spectrum distribution of different LED are changed, these differences can be observed It is color difference. When observing the LED at a certain angle, its color changes, and the ability of the human eye to judge the color of the real picture (such as a movie picture) is better than the picture produced by the observation computer.

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March 16, 2018

THE DIFFERENCE BETWEEN FLEXIBLE LED LIGHT STRIP AND LED RIGID LIGHT STRIPS

1. LED rigid light strips are assembled with PCB hard boards. The advantage of the hard light bar is that it is relatively easy to fix, and it is convenient to process and install; the disadvantage is that it cannot be bent freely and is not suitable for irregular places. The LED rigid strip bar has 30 LEDs,36 LEDs, 60 LEDs 72 LEDs, and 120 LEDs and support customized.

2. Flexible LED light strips are assembled with FPC circuit board, assembled with patch LED, so that the thickness of the product is only the thickness of a coin, does not occupy space; the general specification has 30 LEDs, 60 LEDs, 120 LEDs, 240 LEDs etc., different users have different specifications. And it can be cut at will, or it can be extended at will and the illumination is not affected. The FPC material is soft and can be bent, folded and wound freely, and can be moved and stretched in three dimensions without breaking. It is suitable for use in irregular places and small spaces, and because it can be bent and wound arbitrarily, it is suitable for arbitrarily combining various patterns in advertising decoration.

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February 18, 2018

LED WAREHOUSE LIGHTING: WHAT IS THE BEST LED PRODUCT FOR MY APPLICATION?

Industrial facilities consume a tremendous amount of energy. Accordingly, and as you might expect, these buildings are expensive to operate. Keeping the lights on is a significant part of your facility’s cost of operations, and you may be consuming and paying for much more than you need to if you’re using conventional lighting fixtures. Fortunately, there has never been a better time to look for new energy efficient lighting solutions. LEDs are changing the landscape and are available in all of the most commonly used fixtures in commercial buildings.

LED Warehouse Lighting: What is the best LED product for my Application?

  • High Bay Fixtures are often used in warehouse settings which have ceilings approximately 25 ft and higher. They are used to light both horizontal and vertical working planes, and can be used with a variety of reflectors. Typically, high bay lighting fixtures have used fluorescent bulbs or metal halide bulbs in the past. While these types of industrial lighting have their advantages, LED high bay fixtures will outperform fluorescents and metal halides in important ways.
  • Low Bay Fixtures are used in warehouses and other commercial facilities where both ceilings and mounting height are lower. High bay lights are not appropriate in these buildings because they may not distribute light properly. Like high bays, low bay lighting fixtures also typically use metal halide and fluorescent bulbs...but both are quickly losing ground to LED warehouse lighting fixtures.
  • Linear Strip Lights are a great fit for large places like department stores or grocery stores. Some of their benefits include a smaller footprint and a cleaner look. When you consider LED strip lights for commercial spaces, there is also a smaller energy footprint as well. Historically, T12 and T8 light fixtures have been used when industrial strip lighting is required or desired.
  • Recessed Troffer lights come in three standard sizes: 1’ x 4’, 2’ x 2’, and 2’ x 4’. Conventional Troffer fixtures often include T12 and/or T8 Fluorescent lamps, ranging from 2-4 lamps per fixture.  They can be surface mounted, pendant mounted, or chain-hung.  LED Troffer solutions can consist of new LED fixtures, or LED Linear Tube retrofits, with the best option depending on existing operating conditions.  Troffer applications exist in a variety of Warehouse and Industrial buildings and facilities.  Whether you choose recessed or surface-mounted depends on ceiling fit and desired light performance.

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January 19, 2018

WHAT IS HIGH BAY LIGHTING, AND WHAT APPLICATIONS BENEFIT FROM IT?

Whenever a large indoor space needs to be illuminated, high bay lighting is usually appropriate. Consider spaces like manufacturing facilities, gymnasiums, warehouses, large department stores, factories, and more; these facilities are typically vast and cover a lot of vertical as well as horizontal space. This requires powerful lighting to provide the appropriate foot-candle levels to adequately illuminate. High bay lighting fixtures typically hang from the ceiling via hooks, chains or pendants, or they may be fixed to the ceiling directly (similar to troffer lights).

Various industries and facilities require high bay lighting. Some of the most common are:

Warehouses

Industrial facilities

Manufacturing facilities

School and university gymnasiums

Municipal facilities like community centers or recreation centers

Commercial applications like department stores

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January 14, 2018

LED WAREHOUSE LIGHTING: WHAT IS THE BEST LED PRODUCT FOR MY APPLICATION?

Industrial facilities consume a tremendous amount of energy. Accordingly, and as you might expect, these buildings are expensive to operate. Keeping the lights on is a significant part of your facility’s cost of operations, and you may be consuming and paying for much more than you need to if you’re using conventional lighting fixtures. Fortunately, there has never been a better time to look for new energy efficient lighting solutions. LEDs are changing the landscape and are available in all of the most commonly used fixtures in commercial buildings.

LED Warehouse Lighting: What is the best LED product for my Application?

  • High Bay Fixtures are often used in warehouse settings which have ceilings approximately 25 ft and higher. They are used to light both horizontal and vertical working planes, and can be used with a variety of reflectors. Typically, high bay lighting fixtures have used fluorescent bulbs or metal halide bulbs in the past. While these types of industrial lighting have their advantages, LED high bay fixtures will outperform fluorescents and metal halides in important ways.
  • Low Bay Fixtures are used in warehouses and other commercial facilities where both ceilings and mounting height are lower. High bay lights are not appropriate in these buildings because they may not distribute light properly. Like high bays, low bay lighting fixtures also typically use metal halide and fluorescent bulbs...but both are quickly losing ground to LED warehouse lighting fixtures.
  • Linear Strip Lights are a great fit for large places like department stores or grocery stores. Some of their benefits include a smaller footprint and a cleaner look. When you consider LED strip lights for commercial spaces, there is also a smaller energy footprint as well. Historically, T12 and T8 light fixtures have been used when industrial strip lighting is required or desired.
  • Recessed Troffer lights come in three standard sizes: 1’ x 4’, 2’ x 2’, and 2’ x 4’. Conventional Troffer fixtures often include T12 and/or T8 Fluorescent lamps, ranging from 2-4 lamps per fixture.  They can be surface mounted, pendant mounted, or chain-hung.  LED Troffer solutions can consist of new LED fixtures, or LED Linear Tube retrofits, with the best option depending on existing operating conditions.  Troffer applications exist in a variety of Warehouse and Industrial buildings and facilities.  Whether you choose recessed or surface-mounted depends on ceiling fit and desired light performance.

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December 29, 2017

WHAT ARE THREE MAJOR BENEFITS OF USING LED LIGHTING TECHNOLOGY FOR ALL APPLICATIONS?

It’s no secret that LED lighting technology has surpassed the capabilities of conventional lighting in important ways. In addition to the considerations discussed above, there are three general benefits of LED lighting that apply to all lighting applications.

Decreased maintenance requirements.

As discussed above, LED lights have a lifespan that is four to forty times longer than many conventional bulbs. This means fewer replacements for bulbs that wear out. LED lighting technology also generates light differently than typical fuel and filament lighting, by using a diode instead. This means that there are fewer moving pieces to break, and consequently, fewer repairs or replacements. Maintenance is an especially important consideration when it comes to industrial lighting or warehouse lighting. By definition, high bay lights have higher mounting heights, which means that changing a bulb requires some specialized equipment or creativity. Scaffolding, catwalks, and hydraulic lifts are generally used to swap or replace bulbs, and each of these can result in additional maintenance or equipment costs. Again, the lifespan of industrial LED lighting means that fixtures need to be changed much less often, which means savings for your bottom line.

Improved lighting quality.

Industrial LED lighting and high bay lights will typically score better in a head-to-head comparison against most other bulbs when it comes to Color Rendering Index (CRI), Correlated Color Temperature (CCT), and Foot Candles. CRI is a measurement of a light’s ability to reveal the actual color of objects as compared to an ideal light source (natural light). In non-technical terms, CCT generally describes the “glow” given off by a bulb - is it warm (reddish), or cold (bluish white)? Footcandles compare the amount of light coming from a source and the amount of light hitting the desired surface; they’re basically a measure of efficiency. On all three fronts, LED lights perform very well.

Increased energy efficiency.

Not only do LED lights generate light differently, they also distribute light differently than conventional lighting solutions, which results in less energy required to provide the same output. How does that work? First, many conventional lights waste a lot of the energy they produce by emitting it as heat (this is especially the case with metal halide lighting). Second, most conventional lights are omnidirectional, which means that they output light in 360 degrees. So, a lot of light is wasted pointing at a ceiling, or being diluted because it has to be redirected through the use of fixtures. Industrial LED lighting for applications that require high bay lights eliminates these two problems of wasted energy (through heat loss and omnidirectional emission).

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August 12, 2017

HOW TO CHOOSE LED FLOODLIGHTS?

How to choose LED floodlights?
Precautions when purchasing:
1, LED floodlight brightness (MCD) is different, the price is different, the more LED lamp beads, the greater the brightness, the natural price is not cheap, the general LED lamp bead is also a high-tech product, in order to ensure the follow-up floodlights The stability of the use process, it is recommended to choose a regular brand manufacturer to buy LED floodlights.

2, the anti-static ability is also considered, the anti-static ability of the LED, its long service life, and therefore high price, usually anti-static than 700V LED can be used for LED lighting.

3, the same wavelength of the LED, so the color is the same, this kind of LED floodlights natural price is more expensive, if the LED floodlights are required to have the same color, the price will be higher.

4, leakage current is also very important, LED floodlights are unidirectional conductive illuminators, if there is reverse current, it is called leakage, LED leakage current is large, its service life is short, the current is slightly larger, you can burn Bad lamp beads, so the price of this type of LED floodlights is relatively low, it is recommended not to buy this type of lamps.

5, the lighting angle considerations, LED lighting angle is different, its lighting effect is not the same, the natural price is not the same, the general special lighting angle, the price is higher, no matter whether you want to buy LED floodlights have such requirements It is recommended to consider this factor in the purchase process.

6, the consideration of the chip factor, the illuminator of the LED floodlight is a wafer, the price of the different wafers is very different.

The wafers in Japan and the United States are relatively expensive. Generally, the price of wafers in Taiwan and China is lower than that of Japan and the United States (CREE), and the size of the wafer also affects the illumination of LED floodlights. Generally, the quality of large-wafer LEDs is better than that of small wafers.

7. The colloid is a factor that must be considered in the LED floodlight purchase process because it is related to the longevity of the life of the floodlight. Generally, the colloid of ordinary LED is generally epoxy resin, and the high-quality outdoor LED Lighting should be UV and fire resistant, so LEDs with UV and fire retardant are more expensive.

If LED floodlights are used outdoors, it is recommended to choose LEDs with UV and fire retardant when purchasing.

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July 27, 2017

HOW TO CHOOSE LED FLOODLIGHTS?

How to choose LED floodlights?
Precautions when purchasing:
1, LED floodlight brightness (MCD) is different, the price is different, the more LED lamp beads, the greater the brightness, the natural price is not cheap, the general LED lamp bead is also a high-tech product, in order to ensure the follow-up floodlights The stability of the use process, it is recommended to choose a regular brand manufacturer to buy LED floodlights.

2, the anti-static ability is also considered, the anti-static ability of the LED, its long service life, and therefore high price, usually anti-static than 700V LED can be used for LED lighting.

3, the same wavelength of the LED, so the color is the same, this kind of LED floodlights natural price is more expensive, if the LED floodlights are required to have the same color, the price will be higher.

4, leakage current is also very important, LED floodlights are unidirectional conductive illuminators, if there is reverse current, it is called leakage, LED leakage current is large, its service life is short, the current is slightly larger, you can burn Bad lamp beads, so the price of this type of LED floodlights is relatively low, it is recommended not to buy this type of lamps.

5, the lighting angle considerations, LED lighting angle is different, its lighting effect is not the same, the natural price is not the same, the general special lighting angle, the price is higher, no matter whether you want to buy LED floodlights have such requirements It is recommended to consider this factor in the purchase process.

6, the consideration of the chip factor, the illuminator of the LED floodlight is a wafer, the price of the different wafers is very different.

The wafers in Japan and the United States are relatively expensive. Generally, the price of wafers in Taiwan and China is lower than that of Japan and the United States (CREE), and the size of the wafer also affects the illumination of LED floodlights. Generally, the quality of large-wafer LEDs is better than that of small wafers.

7. The colloid is a factor that must be considered in the LED floodlight purchase process because it is related to the longevity of the life of the floodlight. Generally, the colloid of ordinary LED is generally epoxy resin, and the high-quality outdoor LED Lighting should be UV and fire resistant, so LEDs with UV and fire retardant are more expensive.

If LED floodlights are used outdoors, it is recommended to choose LEDs with UV and fire retardant when purchasing.

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June 14, 2017

HOW TO PAIR YOUR LED DIMMER WITH LIGHTS

When you first connected your dimmer/controller, don't panic if you find that the remote control can no longer control the lights. 

 

This is because the LED dimmer/ controller has lost its connection to the remote control.

All you need to do is pair them again by pressing both SPEED - and SPEED + for a few seconds.

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March 20, 2017

LED FLOODLIGHT INSTALLATION TIPS AND PRECAUTIONS.

LED floodlight installation tips and precautions.

First, the steps
1, install the guardrail, punch holes in the wall, the spacing according to the actual requirements, generally within 3 cm
2, do anti-static measures, such as the workbench should be grounded, workers wear the corresponding electrostatic clothing, anti-static measures, because different grades of LED floodlights of different quality, the anti-static ability is different
3, installation attention to sealing, poor sealing, directly affect the service life of LED floodlights
4, LED floodlight wiring is best not to exceed 25 cm, the transformer power can be relatively long, otherwise, it will affect the brightness
the installation notes
1, try to use the series LED form because the LED floodlight voltage difference is special. The peak current of ordinary LED is maintained at 80 mA, and the reverse voltage is above and below 6V. When designing the circuit, pay attention to the peak voltage and current at this extreme value.
2, the welding voltage is less than 25 watts, the soldering iron only controls the bare SMD LED under the high temperature of 300 degrees Celsius, do not squeeze its epoxy part, or wipe with a hard object, because the LED lamp is very fragile Very easy to damage, welding time is 3 seconds. LED floodlights are widely used, so the installation tips and precautions are very important.

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March 03, 2017

ARE THE PROJECTION LAMP AND THE FLOODLIGHT THE SAME KIND OF LAMP?

Are the projection lamp and the floodlight the same kind of lamp?

A floodlight is a luminaire that specifies illumination on the illuminated surface that is higher than the surrounding environment. Also known as the spotlight. Typically, it can be aimed in any direction and has structures that are unaffected by climatic conditions. Mainly used for large-area job mines, building outlines, stadiums, overpasses, monuments, parks and flower beds. Therefore, almost all large-area lighting fixtures used outdoors can be regarded as floodlights. The angle of the exit beam of the floodlight is narrow and wide, ranging from 0° to 180°. The beam is particularly narrow and is called a searchlight.

Floodlight, English name: Floodlight Floodlight is a point source that can be uniformly illuminated in all directions. Its illumination range can be adjusted arbitrarily, and it is represented by a regular octahedron icon in the scene. Floodlights are one of the most widely used sources in renderings, and standard floodlights are used to illuminate the entire scene. Multiple floodlights can be applied to the scene. In order to produce a better effect, the shooting light bulb is loaded into a large reflecting umbrella for use as a high-intensity diffusing light source. Although it is indispensable for lighting in the shed, it is also one of the light sources with good lighting effects for general amateur indoor photography. Two is not a kind of light.

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February 10, 2017

HOW TO INSTALL A DIMMER SWITCH FOR LED STRIP

Dimmers range in size from small units the size of domestic light switches to high-power units used in large theatrical or architectural lighting installations. Small domestic dimmers are generally directly controlled, although remote control systems (such as X10) are available. Modern professional dimmers are generally controlled by a digital control system like DMX or DALI. In newer systems, these protocols are often used in conjunction with ethernet.

For LED strip, most time we can use IR or RF controller/dimmer with remote to control them easily. This is especially essential for RGB strip.

About how to install a dimmer switch for your strip, 3 common applications are shown below:

Connecting methods shown in the picture are simple samples, for a large project or complex installation, some more accessories are needed. And special case needs special analysis, if you have questions about this, you can ask help from us by sending mail to us.

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