Led Lights
A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices, and are increasingly used for lighting sources and lighted signs. Introduced as an 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.
The LED is based on the semiconductor diode. When a diode is forward biased (switched on), electrodes can then recombine with holes within the device, releasing energy in the form of photons. This effect is called electrolumenesense and the color of the light (corresponding to the energy of the photon) is determined by the energy cap of the semiconductor. An LED is very small in area (less than 1 mm2), and integrated optical components are used to shape its radiation pattern and assist in reflection. LEDs present advantages over incandescent light sources including lower energy consumption , longer lifetime, improved robustness, smaller size, faster switching, and greater durability and reliability. However, they are expensive and require more precise current and heat management than traditional light sources. Current LED products for general lighting and lighted signs are more expensive to buy than fluorescent lamp sources of comparable output.