Because the light source of high pressure sodium lamp close to monochrome, color is not easy, so it is suitable for the color is not too important, but because of its high efficiency, about 2 times as high pressure mercury lamp, long life of 1000 hours, can ignite, not only power again in 1 minutes, through fog and strong ability. It is widely used square, station, airport, highway and so on.
The basic structure of the high-pressure sodium lamp, mainly composed of filaments, bimetal thermal relay, discharge tube, glass shell, etc., it consists of translucent polycrystalline alumina ceramic material, filled with mercury and mercury sodium agent, mercury vapor to produce high pressure, made of tungsten filament filament spiral or woven into the store a certain amount of alkaline earth metal oxide shape, when the filament heating, alkaline earth metal oxide emission. Double metal role is: when the lamp power, the current through the ballast, thermal resistance, double sheet metal forming pathway, thermal resistance heating, double metal pieces, instantaneous electromotive force generated by the ballast the inert gas ionization discharge tube, temperature, mercury with gasification discharge, the sodium become gaseous discharge resulting from light,
The lamp is a new type of electric light source with high efficiency, the efficiency can be as high as 100lm/w, with high pressure and low pressure sodium lamp two. In the glass enclosure is made of a special glass discharge tube, the tube is filled with proper amount of sodium, mercury and an inert gas, between the discharge tube and glass shell vacuum, in order to reduce the influence of environmental temperature on the lamp.
