Light Emitting Diode (LED)

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Introduction

"A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices and are increasingly used for other lighting. Introduced as a practical electronic component in 1962, early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet and infrared wavelengths, with very high brightness."

Source and more info: http://en.wikipedia.org/wiki/Light-emitting_diode


Further Readings