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Halogen

The Halogen Lamp

A halogen 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. The combination of the halogen gas and the tungsten filament produces a halogen-cycle chemical reaction, which redeposits evaporated tungsten on the filament, increasing its life and maintaining the clarity of the envelope. This allows the filament to operate at a higher temperature than a standard incandescent lamp of similar power and operating life; this also produces light with higher luminous efficacy and colour temperature. The small size of halogen lamps permits their use in compact optical systems for projectors and illumination. The Halogen lamp was invented by Elmer Fridrich in 1955. These lamps were commonly used in household lighting, small display lamps and outdoor flood lighting. They were very popular in the 1990’s to the 2000’s for spot lighting in Kitchens or glass cupboards before LEDS took over.