high-pressure sodium lamp
high-pressure sodium vapour lamp
high-intensity discharge lamp in which the light is produced mainly by radiation from sodium vapour operating at a partial pressure of the order of 10 kPa
Note 1 to entry: The term "high-pressure sodium lamp" includes electric lamps with clear or diffusing bulb.
Note 2 to entry: This entry was numbered 845-07-23 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-536 in CIE S 017:2011.