what causes the difference in color between leds?
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LEDs produce different colors by using various materials which produce photons at different wavelengths. Those individual wavelengths appear as light of different colors. ... Blue, green and cyan LEDs use the indium gallium nitride (InGaN) system.
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The yellow color you see on bare LEDs are the color of phosphor, which is used to convert the blue light emitted from the chip into a wide spectrum, the visually white light.
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Do LED lights emit blue light? Yes—but no more blue light (pdf) than other lightbulbs, provided they give off the same balance of shorter and longer light wavelengths. “Warmer” light has more of a yellow tone to it, while “cooler” light, which is similar to daylight, appears a little bluer.
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LED. The advantage of LED is the extra long life, and, they all have no problem coming on in very cold temperatures. In fact, LEDs get more efficient as the ambient temperature gets lower. ... LEDs require air flow around the bulb to remove heat from the fins or heat sink.
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When an electron and an electron hole collide, a small amount of energy is released as a photon. The result is the visible light we see in an LED. LEDs are wired in series-parallel just like the traditional bulbs we described above. Unlike incandescent lights, however, LEDs do not typically make use of shunts.
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LED light sources are based on the Kelvin system of measure. A warm color temperature is typically 3,000K or less. A "cool" white bulb commonly has a color temperature of 4,000K and higher on the Kelvin scale.
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Not all LED's are dimmable. The box should say if they are dimmable. Usually if they are dimmable, the instructions might say something like dimmable with standard dimmers.
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LCD and LED screens bear one primary difference, which is the backlighting. A monitor screen requires a backlight that can allow the device to create an image on the screen. LCDs use Cold Cathode Fluorescent Lamps (CCFL) as backlights and LED laptop screens use Light Emitting Diodes (LED) as backlights.
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So, LED screens have more contrast, more brightness, consume less energy, and have better response times. LCDs on the other hand are a lot cheaper, have lower response times, lower contrast and brightness rates but have more chance to prevent a possible burn-in. Overall, LED screens seem like a better choice.
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Warm lights have lower color temperatures, and therefore appear more yellow, while cool lights have higher color temperatures, and appear whiter or bluer. Warm white ranges from 2200K to about 3000K, while cool white is a round 4000K.
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Standard RGB LED strip uses a 3-in-1 LED chip made up of red, green and blue chips. It can produce a wide range of colours by mixing the three and looks almost white with all three at full brightness.
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RGB LED controllers work on a much simpler principal. They alter the power on each of the three channels (red, green and blue) to create a specific colour mix. To generate a purple colour, for example, the red and blue channels would be wound up, and the green channel turned off completely.
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['To cycle through the available backlight colors press Fn+C keys .', 'White, Red, Green and Blue are active by default; up to two custom colors can be added to the cycle in the System Setup (BIOS).']
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There are various hazards associated with different wavelengths of light; however, the type and amount of eye damage LED lights can cause depends on the colour and intensity. LED grow lights with higher levels of blue and UV diodes can be harmful, similarly all-white lights that emit a cooler white light.
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One is to use individual LEDs that emit three primary colors—red, green and blue—and then mix all the colors to form white light. The other is to use a phosphor material to convert monochromatic light from a blue or UV LED to broad-spectrum white light, similar to a fluorescent lamp.
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Computers use RGB because their screens emit light. The primary colors of light are RGB, not RYB. There's no yellow in this square: It just looks yellow.
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LED, which stands for “light emitting diodes,” differs from general LCD TVs in that LCDs use fluorescent lights while LEDs use those light emitting diodes. Also, the placement of the lights on an LED TV can differ. The fluorescent lights in an LCD TV are always behind the screen.