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Metal Halogen Lamps
Metal Halogen Lamps
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Metal halide lamp is an electric lamp that generates light by electric arc discharge in a mixture of mercury vapors and metal halide (metal compounds with bromine or iodine). They are similar to the mercury lamps but containing additional metal compounds in electric arc tube, which improve the efficiency and color rendering (whiteness) of the light. Metal halogen lamps have a high luminous efficacy at around 75-100 lumens per Watt, which is about twice the efficiency of mercury lamps and 3 to 5 times the efficiency of incandescent lamps. Also, metal halide bulbs have a moderately long life (from 6000 to 15000 hours - slightly shorter than mercury lamps one) and emit an intense white light.
As one of the most effective sources of CRI white light, metal halide lamps are one of the fastest growing products in the lighting industry. They are widely used for lighting of large spaces in commercial, industrial and public buildings, such as parking lots, playgrounds, factories, shops and etc. . The lamp is composed of a small ceramic or quartz electric arc tube, which is containing gas and an arrester and it is enclosed in a larger glass balloon. In this large bubble has coating which serves as a filtration of the generated ultraviolet (UV) light. Similar to other lamps with high efficient discharge, they work under high pressure (4-20 atmospheres) and require special fixtures for safe handling and electrical ballast. They, also require a warm-up period of several minutes to reach its maximum luminous intensity, so that they are usually not used for indoor lighting housing which switches on and off frequently.
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