Automotive halogen lamps, also known as tungsten-halogen bulbs and quartz bulbs, are a variant of incandescent lamps:

1. Halogen lamps are made with a tungsten filament, but are encased in a smaller quartz glass shell. Because the glass shell is so close to the filament, it would melt easily if it were made of glass. The gas inside the glass shell is made up of different gases that make up a halogen lamp set. These gases have a very interesting property: they combine with tungsten vapor;

2. If the temperature is not high enough, the tungsten atoms bound to the halogen gases evaporate and are redeposited on the filament. This cyclic process makes the filament last a lot of time. Also, it can run hot filaments, which means you get more light energy. You're still getting a lot of heat, but because the quartz glass shell is so close to the filament, it's hotter compared to a normal bulb;

3. Halogen bulbs can also operate at higher temperatures than normal incandescent bulbs, and they're brighter and more efficient. However, at this temperature, ordinary glass may soften, so halogen bulbs need to use quartz glass with a higher melting point. And because quartz glass can not block ultraviolet light, so halogen bulbs are usually and need to use a separate ultraviolet filter;

4, halogen bulbs on the crystal glass if there is oil, it will cause the glass temperature varies, reducing the life of the bulb. Therefore, when replacing halogen bulbs, avoid touching the glass of the bulb. If your fingers touch it should be cleaned with alcohol.

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