| what is halogen tungsten lamp lighting small knowledge? - China lighting network
Tungsten halogen lamp is made using the halogen circulation principle of incandescent lamp, it is to improve the light of the characteristics of photosynthetic efficiency and life span. As we know, to make the incandescent lamp high luminous efficiency, will raise the temperature of filament, and the higher the temperature of the filament, tungsten evaporation is the faster, the filament thinner and burn out quickly. At the same time, tungsten evaporation deposition on the blister blister black, and reduces the luminous efficiency of lamps. To manufacture high luminous efficiency of tungsten, tungsten solution to increase the temperature of the tungsten reduce evaporation of the contradiction. Tungsten halide volatile, if make tungsten halide formation, is deposited on the blister in the decomposition of filament on or near a filament, tungsten return to let evaporation filament, both to prevent black light bulbs, and extend the lamp life. Tungsten halogen circulation process is after the light, from the tungsten filament evaporation spread to wall, under the appropriate temperature, the tungsten atoms with the halogen atoms, generate halide, generate halide molecule and spreading filament, near because of the filament temperature is higher, for tungsten and halogen halide and decomposition. Decomposition of tungsten is back on the filament, halogen, for the next cycle reaction. Fluorine, chlorine, bromine, iodine, such as halogen theoretically can be done in tungsten filament lamp recycling, they cycle reaction is the main difference between the required temperature is different, and the light bulb inside other interact with different levels, in theory and practice is more successful iodine tungsten lamp and bromine tungsten lamp. Iodine tungsten lamp has two kinds of vertical circular and tubular. Horizontal tubular halogen lamp burning requirements, to no more than 4 degrees, otherwise it will due to the uneven of convection caused by iodine tungsten cycle filament. Its advantage is higher than incandescent lights, light color is good, long life, small volume, etc. Deficiency is the ignition point, purple iodine vapor to absorb part of the visible light, make the lighting effect and color temperature drop, in order to prevent gas convection caused local black glass shell, is asked for ignition point position. Bromine tungsten lamp to overcome the problems of iodine tungsten lamp, hydrogen bromide absorption of visible light, 4% higher than that of iodine tungsten lamp luminous efficiency 5%, also can improve the color temperature, the ignition position does not affect its chemical circulation, glass shell and filament can be designed into any shape. Due to these advantages, in the film and television lighting and other aspects of replace the halogen lamp. YanZhiXiang
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