High Pressure Mercury (Vapour) Lamp

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)

English