Working Principle of Halogen Bulb

2019-10-17 14:49:01

Halogen bulb, referred to as halogen bulb or halogen lamp. The halogen gas such as iodine or bromine is injected into the bulb. At high temperature, the sublimated tungsten wire will react with halogen chemically. After cooling, the tungsten will solidify on the tungsten wire again, forming a balanced cycle and avoiding premature fracture of the tungsten wire. When the filament is heated, the tungsten atoms are evaporated and move towards the glass tube wall. When the filament is close to the glass tube wall, the tungsten vapor is cooled to about 800 ℃ and combined with halogen atoms to form tungsten halide. Tungsten halogen lamp is the principle of thermal radiation light source. It is filled with special working gas. Its composition is 95% mixture gas (Dibromomethane and krypton gas) and 5% high-purity nitrogen. These gases establish the tungsten halogen cycle in the lamp. Through the recycling process, the service life of the filament is not only greatly extended (almost four times as long as that of the incandescent lamp), but also because the filament can work at a higher temperature, thereby obtaining a higher brightness, a higher color temperature and a higher luminous efficiency. The halogen cycle keeps the bulb clean and almost constant light output for a lifetime. Halogen bulb must be made of fused silica (quartz) or high melting point glass (such as aluminosilicate glass).