In the process of light emitting, the filament temperature is very high, such as air is very easy to burn due to oxidation, and smart scientists have found an effective method in continuous tests, is to add inert gas mixture. The interior of the lamp is often filled with argon nitrogen gas mixture, used as a protective gas, so that the lamp durable, both of which are inert gases, not easy to heat expansion, a good protection of the lamp and tungsten wire life. Lamp filled with argon and welding metal used to protect the principle of gas is the same, tungsten wire at the same temperature, in argon evaporation is less than the vacuum, which greatly extends its use time, and there is a key point is in the discharge process argon can emit a lot of light, the lamp brightness is greatly enhanced, improve the luminous rate.

In addition, users will ask "if the effect is so good, why can't it be added separately". In fact, because high-purity gas is not easy to get and the price is high, it is not economical.