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卤钨灯是在灯内充人微量卤族元素，使蒸发钨与卤元素起化学反应，以克服普通白炽灯玻璃壳易发黑的缺陷，其工作原理与白炽灯基本相似，即利用灯丝电阻电流的热效应（电能转换为热能），使灯丝温度升高发光。也属于热辐射电光源，由于充入的卤元素不同，卤钨灯有碘钨灯和溴钨灯之分，而它们的工作原理是相同的。
Halogen tungsten lamp is filled with trace halogen elements in the lamp to make the evaporated tungsten react with halogen elements, so as to overcome the defect that the glass shell of ordinary incandescent lamp is prone to blackening. Its working principle is basically similar to that of incandescent lamp, that is, to use the thermal effect of resistance current of filament (electric energy converted into thermal energy) to make the filament temperature rise and light up. It is also a kind of thermal radiation electric light source. Due to the different halogen elements, tungsten halogen lamps can be divided into iodine tungsten lamps and bromine tungsten lamps, and their working principles are the same.