A light-emitting diode (LED) is a two-lead semiconductor light source. It is a basic pn-junction diode, which emits light when activated. When a fitting voltage is applied to the leads, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is called electroluminescence, and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor.
Early LEDs were often used as indicator lamps for electronic devices, replacing small incandescent bulbs. They were soon packaged into numeric readouts in the form of seven-segment displays, and were commonly seen in digital clocks. Recent developments in LEDs permit them to be used in virtually all general lighting applications. LEDs have many advantages over other light sources including lower energy consumption, longer lifetime, improved physical robustness, smaller size, and faster switching.
Advanced Lighting technologies NZ Ltd provide options from Cree, Pracht, Flextronics and Carmanah brands to meet any lighting application requirement.