Definitions for "High-Pressure Sodium Lamp"
Keywords:  hid, sodium, hps, lamp, mercury
Sodium vapour lamp in which the partial pressure of the vapour during operation is of the order of 104 Pa - for example, SON and SON-T lamps.
HID lamp where radiation is produced from sodium vapor at relatively high partial pressures (100 torr). HPS is essentially a "point source".
A high-intensity discharge (HID) lamp whose light is produced by radiation from sodium vapor (and mercury).