Halogen lamp, also known as tungsten halogen bulb, is a type of incandescent lamp. The principle is to inject a halogen gas such as iodine or bromine into the bulb. At high temperatures, the sublimated tungsten wire chemically interacts with the halogen, and the sublimated tungsten re-solidifies on the tungsten wire to form a balanced cycle that prevents premature rupture of the tungsten wire. Therefore halogen bulbs last longer than incandescent lamps.
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