high-pressure mercury lamp
high-pressure mercury vapour lamp
high-intensity discharge lamp in which the major portion of the light is produced, directly or indirectly, by radiation from mercury operating at a partial pressure in excess of 100 kPa
Note 1 to entry: The term "high-pressure mercury lamp" includes clear, phosphor-coated (mercury fluorescent) and blended lamps. In a fluorescent mercury discharge lamp, the light is produced partly by the mercury vapour and partly by a layer of phosphors excited by the ultraviolet radiation of the discharge.
Note 2 to entry: This entry was numbered 845-07-20 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-535 in CIE S 017:2011.