Halogen lamp

A halogen lamp operating in its fitting with the protecting glass removed
A Halogen lamp behind a round UV filter. A separate filter is included with some halogen light fixtures to remove UV light.
Xenon Halogen Lamp (105 W) for replacement purposes with an E27 screw base
A close-up of a halogen lamp

A halogen lamp, also known as a tungsten halogen, quartz-halogen or quartz iodine lamp, is an incandescent lamp consisting of a tungsten filament sealed into 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. The combination of the halogen gas and the tungsten filament produces a halogen cycle chemical reaction which redeposits evaporated tungsten to 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.

History

A carbon filament lamp using chlorine to prevent darkening of the envelope was patented [1] in 1882, and chlorine-filled "NoVak" lamps were marketed in 1892. [2] The use of iodine was proposed in a 1933 patent, [3] which also described the cyclic redeposition of tungsten back onto the filament. In 1959, General Electric patented [3] a practical lamp using iodine. [4]

In 2009, the EU began its phase-out of inefficient bulbs. The production and importation of directional mains-voltage halogen bulbs was banned on 1 September 2016. Non-directional halogen bulbs are set to follow on 1 September 2018. [5]

Other Languages
беларуская: Галагенавая лямпа
Cymraeg: Golau halogen
Bahasa Indonesia: Lampu halogen
italiano: Lampada alogena
Nederlands: Halogeenlamp
српски / srpski: Халогена сијалица
srpskohrvatski / српскохрватски: Halogena sijalica
svenska: Halogenlampa
Türkçe: Halojen lamba
українська: Галогенова лампа
Tiếng Việt: Đèn halogen
粵語: 石英燈
中文: 卤素灯泡