Tungsten halogen lamp is a gas filled incandescent lamp with part of halogen group elements or halides in the filled gas.In ordinary incandescent lamps, the high temperature of the filament causes the evaporation of tungsten, and the evaporated tungsten precipitates on the glass shell, resulting in the blackening of the bulb glass shell.In 1959, people invented the halogen tungsten lamp, which eliminated this blackening phenomenon by using the principle of halogen tungsten cycle.Tungsten halogen lamps can be divided into 6 categories according to their purposes: ① Tungsten halogen lamps for lighting.It is also divided into three types: high-voltage double ended lamp, low-voltage single ended lamp and multi plane cold reflection low-voltage directional lamp, which are widely used for indoor lighting in shops, shop windows, exhibition halls and families. ②Automobile halogen tungsten lamp.It is also divided into front lamp, low beam lamp, turn lamp, brake lamp, etc. ③Infrared and ultraviolet radiation halogen tungsten lamp.Infrared radiation tungsten halogen lamps are used in heating equipment and photocopiers, and ultraviolet radiation tungsten halogen lamps have been used in the curing process of dental curing powder. ④Photographic halogen tungsten lamp.It has replaced ordinary tungsten filament incandescent lamps in stage, film, television and news photography lighting. ⑤Instrument halogen tungsten lamp.Used in modern microscope, projector, slide and medical instruments and other optical instruments. ⑥Cold reflecting instrument halogen tungsten lamp.It is used on portable electronic projectors, slide projectors, medical and industrial endoscopes, dental surgery coloring curing, color photo printing and other optical instruments.
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