LED means (L) ight (E) mitting (D) iode = Light Emitting Diode
The light emitting diode (LED) light source is a semiconductor. LEDs used as indicator lamps in many devices, and increasingly used for lighting. Introduced as a practice as electronic material in 1962, the beginning of the LEDs emit low-intensity red light, but modern versions are available throughout the visible, ultraviolet and infrared wavelengths, with very high brightness. When a light-emitting diode is switched on, electrons are able to recombine with holes inside the device, releasing energy in the form of photons. This effect is called electroluminescent and color of light (corresponding to the photon energy) is determined by the energy gap of the semiconductor. The LED have many advantages over other sources of light bulbs, including lower power consumption, longer life, improved strength, greater durability and reliability.