Patent ID: 7233110
Filing Date: 2007-06-19
Classification: H01J

Abstract:
1. A metal halide lamp comprising: a refractory, light-transmitting airtight container defining therein a discharge space with an internal volume of not more than 0.1 cc; a pair of electrodes sealed in the airtight container, opposing each other with a distance of not more than 5 mm interposed therebetween; and a discharge medium sealed in the airtight container and including a metal halide material and a rare gas, the metal halide material including a first halide material and a second halide material, the first halide material containing a scandium (Sc) halide and a sodium (Na) halide, the second halide material containing at least one selected from the group consisting of an indium (In) halide and a zinc (Zn) halide, the discharge medium containing substantially no mercury, wherein a load on a wall of the airtight container in a stable state is not less than 50 W/cm A/B≦0.21 where A represents an intensity of an impurity chromium (Cr) spectrum included in lighting spectra, and B represents an intensity of a scandium (Sc) spectrum included in the lighting spectra.