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A halogen lamp (also called tungsten halogen, quartz-halogen, and quartz iodine lamp) is an incandescent lamp consisting of a tungsten filament sealed in a compact transparent envelope that is filled with a mixture of an inert gas and a small amount of a halogen, such as iodine or bromine.
Close-up of a tungsten filament inside a halogen lamp. The two ring-shaped structures left and right are filament supports. The halogen lamp reduces uneven evaporation of the filament and eliminates darkening of the envelope by filling the lamp with a halogen gas at low pressure, along with an inert gas.
For safety reasons, some metal-halide fixtures have a backup tungsten-halogen incandescent lamp that operates during cool-down and restrike. Once the metal halide restrikes and warms up, the incandescent safety light is switched off. A warm lamp also tends to take more time to reach its full brightness than a lamp that is started completely cold.
The bulbs used are referred to as lamps. Stage lighting instruments typically use incandescent lamps, tungsten-halogen lamps, encapsulated arcs, or LEDs. [1] Most theatrical lamps are tungsten-halogen (or quartz-halogen), an improvement on the original incandescent design that used halogen gas instead of an inert gas.
HID lamps are used in high-performance bicycle headlamps, as well as flashlights and other portable lights, because they produce a great amount of light per unit of power. As the HID lights use less than half the power of an equivalent tungsten-halogen light, a significantly smaller and lighter-weight power supply can be used.
Halogen lamps are incandescent lamps filled with highly pressurized inert gas combined with a small amount of halogen gas (bromine or iodine); this lengthens the life of the filament (see Halogen lamp#Halogen cycle). This leads to a much longer life of halogen lamps than other incandescent lamps.
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