High pressure metal vapor discharge lamp.

摘要

A high pressure metal vapor discharge lamp is disclosed which comprises a discharge tube (14) disposed in an outer jacket (10), the discharge tube having electrodes (22) and containing a filling comprising a starting rare gas composed primarily of xenon at a pressure from 40 to 200 Torr; means (50) for starting the discharge tube comprising a glow starter (52) comprising a pair of contacts spaced apart not more than 2.5 mm from each other, and containing a gas composed primarily of argon at a pressure of at least 7 Torr, the pressure in the glow starter (Pg) being related to the pressure in the discharge tube (Pi) according to the expression P9 ≤ - Pi + 19.25; and a starting electric conductor (46) adapted to contact the discharge tube on starting thereof and to separate from the discharge tube after starting.