Patent ID: 7352132
Filing Date: 2008-04-01
Classification: F21S,H01J

Abstract:
1. A metal halide lamp comprising: a refractory, light-transmitting hermetic vessel; a pair of electrodes sealed in the hermetic vessel; a discharge medium including a halide and a rare gas; and metal storing means storing at least one selected from the group consisting of potassium (K), rubidium (Rb) and cesium (Cs), the metal storing means being heated during lighting and gradually discharging the at least one metal in the hermetic vessel, wherein an emission power ratio of visible light with wavelengths of 380 to 780 nm to near-infrared light with wavelengths of 750 to 1100 nm is 0.5:1 to 4.0:1 during stable lighting, and wherein the halide of the discharge medium contains a halide of at least one selected from the group consisting of potassium (k), rubidium (RB) and cesium (Cs).