Patent ID: 6060829
Filing Date: 2000-05-09
Classification: H01J

Abstract:
A high-pressure metal halide lamp comprising:a sealed light-transmittent discharge vessel (1) having a pair of opposed seals (2) and enveloping a discharge space (3) which has a gas filling comprising rare gas and metal halides;a pair of tungsten electrodes (5) oppositely disposed in the discharge space (3);a pair of current lead-through conductors (6) located in respective said seals and issuing from the discharge vessel; anda pair of electrodes rods, each rod having a first portion (71) consisting of tungsten adjacent the electrode and a second portion (72) having a core of tungsten and a skin of at least 90% by weight of rhenium, rest tungsten and being secured to a respective current lead-through conductor (6), each said first and second portion having a common boundary which is located where the temperature is 1900-2300.degree. K during operation.