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The basic luminous principle of halogen lamp is the same as that of incandescent lamp, which is to conduct enough current to the tungsten filament to make the filament heat to incandescent state and emit light. The difference is that the halogen elements of the halogen lamp are filled with some halogen elements, which are generally iodine or bromine. The existence of these halogen elements can slow down the loss of tungsten filament at high temperature, prolong the life of the filament, and also enable the filament to work at higher temperatures, thereby obtaining higher brightness, color temperature and luminous efficiency. At present, most of the car's headlights are halogen lamps.
The structure is simple and the cost is low.
Brightness is easy to control and adjust.
The light has good color rendering and strong penetration.
Compared with ordinary incandescent lamp, it has long service life, high color temperature and high luminous efficiency.
Compared with xenon lamp, the luminous efficiency is still low, and most of the energy is lost in the form of heat.
The life span of xenon lamp is only one tenth of that of xenon lamp.
The color temperature is lower than that of xenon lamp.
Working principle of halogen lamp:
When the tungsten filament is heated, the tungsten atoms are evaporated and move towards the glass tube wall. When approaching the glass tube wall, the tungsten vapor is cooled to about 800 ℃ and combined with halogen atoms to form tungsten halide (tungsten iodide or tungsten bromide). Tungsten halide continues to move to the center of the glass tube, and then returns to the oxidized filament. Because tungsten halide is a very unstable compound, it will decompose into halogen vapor and tungsten again when heated. In this way, tungsten will be deposited on the filament to make up for the evaporated part. Through this regeneration cycle process, the service life of the filament is not only greatly extended (almost four times of that of the incandescent lamp), but als