Go Green With LED Lights in your Homes and Gardens

History and introduction of LED lightings

LED’s have been around since the 60s, but have mostly been relegated to showing the time in an alarm clock or the battery level of a video camera. Its use as a source of illumination was a challenging one for scientists. Light Emitting Diodes or LED Lightings- differ from traditional light sources in the way they produce light. In incandescent bulbs, a tungsten filament is heated by electric current until it glows or emits light. In a fluorescent lamp, an electric arc excites mercury atoms, which emit ultraviolet (UV) radiation. After striking the phosphor coating on the inside of glass tubes, the UV radiation is converted and emitted as visible light. On other hand LED’s are diodes made from semi-conductor materials. This is why they are referred to as “solid state” devices and relies on indium gallium nitride to convert electricity into photons with help of direct current (DC) instead of alternating current (AC) There are other types of Lights which on the principle of solid state objects like semi conductor but LED's are the most relevant for general illumination. It consists of a chip of semi-conducting material treated to create an electric circuit. An LED is usually a small area source, often with extra optics added to the chip that shapes its radiation pattern. The specific wavelength or color emitted by the LED depends on the materials used to make the diode. It depends on the composition and condition of the semi conducting material used, and can be infrared, visible, or near-ultraviolet. Red LED’s are based on aluminum gallium arsenide (AlGaAs). Blue LED’s are made from indium gallium nitride (InGaN) and green from aluminum gallium phosphide (AlGaP). "White" light is created by combining the light from red, green, and blue (RGB) LED’s or by coating a blue LED with yellow phosphor. LED based lights are still under development but it is predicted it will radically change the energy consumption patterns of the world over the next few years. As such there’s a phenomenal amount of resources being devoted to improving LED technology worldwide. The U.S. has committed an uncharacteristically large amount of industrial policy support for LED research and development. Asia is a hotbed of cutting-edge manufacturing technology and Europe and Canada have led the way in energy efficient initiatives accompanied by some of some of the most innovative design styles you can find anywhere.