Patent ID: 6528946
Filing Date: 2003-03-04
Classification: H01J,H05B,Y02B

Abstract:
A metal halide discharge lamp which essentially permits disusing mercury, comprising:(a) a refractory and light-transmitting hermetic vessel; (b) a pair of electrodes fixed to said hermetic vessel, the distance between said pair of electrodes being 1 to 6 mm; and (c) a discharge medium sealed in the hermetic vessel and containing a first halide, a second halide, and Xe gas, (i) said first halide being a halide of a metal which achieves a desired light emission, (ii) said second halide having a relatively high vapor pressure so as to act as a buffer gas to maintain a lamp voltage and contributing to the lamp voltage more than the first halide, and (iii) said Xe gas being sealed in a pressure of at least one atmosphere.