High Pressure Mercury (Vapour) Lamp
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2-3-370
A mercury vapour lamp, with or without a coating of phosphor, in which during operation the partial pressure of the vapour is of the order of 105 newtons per square metre (1 atmosphere) or more.
Reference: C.I.E.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
