Light-Emitting Diode (LED) is mainly two-lead, single color (3 lead for bi-color LED and 4 lead for tri-color LED) semiconductor light source. It is a p–n junction diode, which emits light when activated by providing suitable voltage across its leads. LEDs are available across the infrared, visible and ultraviolet wavelengths, with low to very high brightness. LEDs are commonly used as indicators in electronic circuits, display, electronic signage etc. Advance uses includes aviation lighting, automotive headlamps, advertising, general lighting, traffic signals, and camera flashes.
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