The biggest difference between a halogen bulb and an incandescent lamp is that the glass envelope of the halogen lamp is filled with some halogen gas (usually iodine or bromine). The working principle is: when the filament is heated, the tungsten atoms are evaporated and then turned to the glass. The tube wall moves, and when approaching the glass tube wall, the tungsten vapor is cooled to about 800 ° C and combined with halogen atoms to form a tungsten halide (tungsten iodide or tungsten bromide). The tungsten halide continues to move toward the center of the glass tube and returns to the oxidized filament. Since the tungsten halide is a very unstable compound, it will be decomposed into halogen vapor and tungsten after heat, so that the tungsten is in the filament. It is deposited on top to make up for the part that is evaporated. Through this regeneration cycle, the service life of the filament is not only greatly extended (almost four times that of incandescent lamps), but also because the filament can work at higher temperatures, resulting in higher brightness, higher color temperature and Higher luminous efficiency.

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