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 on 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.
Read more about Halogen Lamp: History, Halogen Cycle, Effect of Voltage On Performance, Spectrum, Safety, Applications, Disposal
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... A similar reaction like that of MoO2 is used in halogen lamps ... The tungsten is evaporated from the tungsten filament and converted with traces of oxygen and iodine into the WO2I2, at the high temperatures near the filament the compound decomposes back to tungsten oxygen and iodine ...
... Halogen lamps are usually much smaller than standard incandescents, because for successful operation a bulb temperature over 200 °C is generally necessary ... glass is a safety precaution, reducing UV emission and because halogen bulbs can occasionally explode during operation ... optical control, also they have higher efficiencies (lumens per watt) and better lives than non halogen types ...
... Halogen lamps do not contain any mercury ... none of the materials making up their halogen lamps would cause the lamps to be classified as hazardous waste ...
Famous quotes containing the word lamp:
“Thus he struggled, by every method, to keep his light shining before men. Surely the lighthouse-keeper has a responsible, if an easy, office. When his lamp goes out, he goes out; or, at most, only one such accident is pardoned.”
—Henry David Thoreau (1817–1862)