A halogen lamp, also known as a tungsten halogen lamp or
quartz iodine lamp, is an incandescent lamp that has a small amount of a halogen
such as iodine or bromine added. The combination of the halogen gas and the
tungsten filament produces a halogen cycle chemical reaction which redeposits
evaporated tungsten back onto the filament, increasing its life and maintaining
the clarity of the envelope. Because of this, a halogen lamp can be operated at
a higher temperature than a standard gas-filled lamp of similar power and
operating life, producing light of a higher luminous efficacy and color
temperature. The small size of halogen lamps permits their use in compact
optical systems for projectors and illumination.
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