Compared with ordinary incandescent lamps, iodine-tungsten lamps greatly reduce the evaporation of tungsten, prolong the service life, and improve the working temperature and luminous efficiency of iodine-tungsten lamps. The average life of an ordinary incandescent lamp is 1000 hours, and the iodine-tungsten lamp is half longer than it, and the luminous efficiency is increased by 30%. From the point of view, the iodine-tungsten lamp is particularly small and exquisite. The same 500-watt bulb, the volume of the iodine-tungsten lamp is only 1% of the incandescent lamp. In addition to iodine, its glass bulb is filled with inert gas, which is small and strong, and the inflation pressure is as high as 1.5 to 10 atmospheres.
Depending on the application, iodine-tungsten lamps can be divided into several types: some iodine-tungsten 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 iodine-tungsten lamps have high power and can radiate a large amount of light energy. It is suitable for lighting in large workshops, squares, stadiums, airports, ports, etc. Some iodine-tungsten lamps are the main source of news photography, color photography, and film photography and projection. The high power, small size and light weight are its main advantages. In some laser devices, iodine-tungsten lamps can also be used as optical pumps.
The iodine-tungsten lamp has high luminous efficiency, high brightness and compact structure. These are the strengths of traffic vehicles. Nowadays trains, especially spotlights, fog lights, main headlights, etc. on cars, are gradually switching to iodine-tungsten lamps.
The most common iodine-tungsten lamp has a slender figure like a pen. The main body of the lamp is a quartz tube with a diameter of 10 to 12 mm and a softening point of up to 1700 °C. The filament is supported by a support ring at a certain distance on the filament, and the rectangular flat block at both ends of the lamp is a sealing portion for ensuring that it is electrically conductive and does not leak.
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