The mercury vapor in the discharge tube in the lamp generates gas under low pressure (less than 102Pa) to emit ultraviolet light. The ultraviolet light irradiates the phosphor of the outer glass bulb to emit illuminating light.

Tungsten wire is used to heat and emit light, and high-temperature-resistant quartz glass is used as the lamp tube. A small amount of halogen element is filled in it to increase the light effect and protect the filament. Metal sodium is filled in the discharge tube to When sodium is heated, it turns into sodium vapor, and the air pressure is very high, so the light efficiency is very high. The sodium vapor emits light when electrified, but the light color turns yellow, which is technically called poor color rendering. There are also low-pressure sodium lamps, which have very high light efficiency but poor color rendering, and are not commonly used in China. Using this design process, other rare metals such as indium, gallium or other rare metals are charged into the discharge tube to make various single-color lamps with high brightness.

Taboos in the use of light bulbs

The impact of changes in power supply voltage on personality and lifespan: The light bulb is designed to comply with the voltage recorded in the trademark. Changes in power supply voltage will obviously cause changes in characteristics. If you use a voltage that is higher than the specification, the lifespan will be shortened. On the contrary, if you use a voltage that is too low, although the life of the lamp will be extended, the brightness will be reduced.

When the bulb is lit, the filament temperature will become very high, causing the temperature of the bulb and the lamp cap to rise. When the temperature rises, it will seriously affect the safety of wiring and etc., and when the bulb temperature Overheating will shorten the life of the lamp after it is installed in the lamp, so in order to avoid this situation, you need to pay attention to ventilation to reduce the temperature.

Reference for the above content? Baidu Encyclopedia-Light Bulb