| Definition: | 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 lamps, phosphor-coated (mercury fluorescent) lamps 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.
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