The high pressure sodium vapor lamp has a very high light output and is mainly used for street lighting.
Inside a high-pressure sodium vapor lamp is a discharge vessel (burner), which consists of transparent alumina ceramics. The discharge vessel is filled with sodium and another noble gas. To protect and isolate thermally burner and some thick metal cable is pressed into balls or elliptical-shaped glass tube. Metal wires are also used to supply electricity. If the light is in operation, the temperature in the discharge vessel of about 1,000 ° C and pressure of the gas is very high, because of this they are named.

