Light the LED flashlight light source used is the LED light source. Thirty DuoNian ago, people first LED successful development, that is the most LED early LED only a very narrow radiation spectrum light output, "bian to focus on red to yellow range. In the 90 s Nakamura and his colleagues exhibition T a GaN manufacturing with the blue LED. Blue LED development that has a broader spectrum width of the strong light LED to become possible. Research At present, the strong light is usually the GaN LED to blue leds and have aluminum garnet phosphors, or a combination of red and green with LED LE D, blu-ray LE D according to certain mixing ratio and get. (Stringfellow Craford and from closing ten LED technology research) LE D in energy saving and long life of great potential, is to promote the technology into lighting in the world of two COINS to reason.

In the past few years, the technology has a remarkable development. At present, some that appeared on the market strong light the LED flashlight efficacy has reached 10 lm/W to 151 m/W. Strong light LE D development success, has become one of the symbols of money to solid state physics: that is the technical achievements may have applied to building lighting. Many soil industry make home to solid state physics technology will make the building lighting technology of the great changes happened coin optimism. Although LED the efficacy maintained a steady growth, but a single LED device can out of total flux is still very low, usually less than 1 lumen. Many developers are positive development of the high power LE D device. In order to achieve the effect of high power, usually by technology including: will DuoGe small power LED together, increase of semiconductor devices, so that the device can accumulate ICI bear large drive current, through the change of the launch of semiconductor equipment of the shape of the surface, use of total reflection reduce hole the absorption of light by so as to improve the efficiency of the light output.

LE D technology development is an industry as the foundation, soil so the technique has with other light source, the development of the technology is more abundant than. LED by 10 will be widely used in building lighting, many manufacturers to build market started racing to develop type LED light source. This is a high practical value of common illumination in LED light source, and new in soil on the industry production to be able to achieve the standardized production, has the economic benefits and to make this an LED light source with people can accept color. Some other good development prospect of the source of the light technology such as: CFL, optical fiber optics and various types of energy-saving lamp, can't say has fully met the above requirement.