The many shades of LED
A LED (light-emitting diode) is a semiconductor device that when powered by current, emits visible light. The light is beautiful and bright and in most cases monochromatic. However, in today’s market, you are now able to find colorful LEDs: Red, Blue and Green. But did you know there are actually many more colors?
First of, what differentiates a colorful LED from another is the material and the proportion of the composition. For example, a red LED will contain aluminum gallium phosphide (AlGaInP or AlInGaP) while a blue LED will contain indium gallium nitride (InGaN). The quantity of the material will also make the color variate from blue to green or red to orange.
The most common colors known are Red, Blue, Green, Yellow, Purple and Orange. But since the combinations are limitless, the color variations and intensities are also creating more variables. But it doesn’t stop there! There are more “neutral” colors of LED available for everyday lighting. You have the bright white LED lights, but there are many color variations available too (as shown in the chart below). In fact, in the lighting industry, we like to measure the color of the light on a temperature scale referred to as Kelvin (K).
Here’s a quick color reference guide:
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