1940s fluorescent lamps, which uses the principle of gas discharge light energy. Because the light emitted mainly ultraviolet radiation, infrared radiation or less , So luminous efficiency than incandescent this replace incandescent lamps, energy saving of 75%, life expectancy increased from 8 to 10 times. It is now commonly used in fluorescent lamps main Fluorescent lamps have high lumen single capped fluorescent lamps, energy-saving lamps (compact fluorescent lamps), has been used very widely, the leading commercial and industrial lighting . Commonly used in offices, shopping malls, the main house and the general public buildings, with an optional light color, high illumination to balance economic advantages can be achieved. It also Issued many beautiful colored light. This is the nature of the chemicals contained in the phosphor coated with magnesium tungstate example, made of blue and white shade Coated with boric acid cadmium hair pink shade. After through design innovation, the development of the phosphor, and the electronic control circuit applications, the performance of fluorescent lamps Improved.