LED can also be designed to produce certain wavelengths of light depending on the semiconductor relied on. As an example, aluminum gallium arsenide is for red LED, aluminum gallium phosphide is for greed LED, and also indium gallium nitride is for blue LED.
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Both flashlights and headtorches from Lenser are obviously based on LED technology. Generally, an LED contains 2 kinds of semiconductors that have varying abilities in the conduction of electrical power: