A tungsten lamp filled with a halogen element or a halide such as bromine iodine is called a halogen lamp or a tungsten halogen lamp. Since quartz glass is used as a glass bulb, a halogen lamp is often called a quartz lamp. Since the temperature of the halogen filament is greatly increased, the luminous efficiency of the halogen lamp is much higher than that of the ordinary incandescent lamp. What makes the halogen lamp particularly attractive is its small size and variety of specifications. Especially the lamp cup can reflect the light concentratedly. Compared with the scattering type light source, it consumes the same electric power and can obtain much stronger illumination. Therefore, people think that the halogen lamp is “extra brightâ€, which makes the surface of the object more beautiful, the brilliance is more dazzling, and even it has a charming flashing effect.
In real life, tungsten halogen lamps have a very wide range of applications: some tungsten halogen lamps can emit a large amount of invisible infrared rays, and have high thermal efficiency, which is an ideal heat source for heating and drying; some tungsten halogen lamps have high power and can radiate a large amount. The light energy is suitable for lighting in large workshops, wide-ranging sports tasting ports, etc. Some tungsten halogen lamps are light sources for photojournalism, color photolithography, and film photography and projection; The brightness is large and the structure is compact. These are the strengths of traffic vehicles. Nowadays trains, especially spotlights, fog lights, main headlights, etc. on cars, are gradually switching to tungsten halogen lamps.
Since the early 1960s, China has begun trial production of tubular iodine-tungsten lamps filled with iodine. Now, the tungsten-halogen lamps produced in China have been sold well in the world, occupying a very important position in the field of light source export. In 2005, China exported a total of 1.45 billion types of tungsten halogen lamps, with a total value of more than 300 million US dollars, and exported destinations to 155 countries and regions on five continents.
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