METAL HALIDE LAMP AND LIGHTING UNIT UTILIZING THE SAME

摘要

Metal halide lamp (1) comprising envelope (10) of a ceramic and a pair of electrodes (16) and comprising light emission tube (6) having a metal halide sealed thereinside, wherein when the distance between the electrodes (16) is referred to as EL (mm) and when the maximum inner diameter of region across the distance (EL) between the electrodes (16) of the light emission tube (6) is referred to as D<SUB>i</SUB> (mm), the relationship EL/D<SUB>i </SUB>> 4.0 is satisfied, and wherein the metal halide contains at least a sodium halide and a neodymium halide. Thus, there can be provided metal halide lamp (1) that while maintaining high efficiency, attains improvement of color characteristics.