Why do halogen lamps last longer than incandescent?
The life of incandescent and halogen lamps, referred to as tungsten filament lamps, is limited by the state of the filament. The filament is the wire inside the bulb that produces light when heated. The lamp will not work if the filament is broken which may occur as a result of the application of force, such as dropping the bulb, or by lack of tungsten in a particular area over the filament. During the operation of tungsten filament lamps, tungsten from the filament evaporates into the gas inside the lamp. When the tungsten comes in contact with a cool surface it will condense. Often, with incandescent products, the tungsten condenses on the bulb wall. Because the tungsten is redeposited on the wall instead of the filament, the filament grows thin over time. Eventually, there will be a point on the filament with so little tungsten that the filament will break and the lamp will stop working. Halogen lamps have a special gas inside their bulb containing halogens. The halogen gas facilita
