Can Quartz Glass Be Used as the Bulb Shell of Iodine Tungsten Lamp?

Quartz glass can be used as bulb shell of iodine tungsten lamp.Iodine tungsten lamp is one of the first choice products in green lighting engineering in China. It has the characteristics of high light efficiency, small volume and energy saving, and is suitable for the design and shape of various lamps and lanterns. It is widely used in lighting field.

The structure of an iodine tungsten lamp is simple and is mainly composed of a tungsten bulb shell and other parts. Because the temperature of the tube wall must make tungsten iodide not adhere to the tube wall, the glass shell of the iodine tungsten lamp is smaller than that of the original incandescent lamp, and the load on the tube wall is high. Normally, quartz glass with high-temperature resistance is used as the bulb shell. 

The successful development of quartz iodine tungsten lamp is a great progress in incandescent lamp technology. The main component of quartz glass is silicon dioxide (SiO₂), which has a small thermal coefficient of 5.5 × 10^-7/℃ and a high melting point and high transparency at high temperatures. The strength of quartz glass reaches the maximum when it approaches the annealing temperature with the increase in temperature. This characteristic can maximize the iodine-tungsten cycle in the bulb while maintaining the stability of the shell. Moreover, the shear modulus, Young's modulus, and damping Poisson's ratio modulus of quartz glass is suitable for the bulb shell of iodine tungsten lamp with the increase of temperature.

Quartz glass as the bulb shell of iodine tungsten lamp also has some shortcomings. It can't cut off ultraviolet light, so it will emit invisible light with the ultraviolet band. Based on the characteristics of quartz glass, iodine tungsten lamp has specific precautions and application scenarios. On the one hand, it is necessary to protect the bulb from ultraviolet radiation in daily use. On the other hand, it will be used in medicine to treat some skin diseases or bronzed skin that can be exposed to the sun indoors.

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