| 摘要 |
PROBLEM TO BE SOLVED: To provide a metal halide lamp having a color temperature of 6,000°K or more, with light emission efficiency improved, and with visibility enhanced at bad weather such as rain. SOLUTION: Mercury, buffer gas and gadolinium halide by 5% or more and 60% or less to a sum total of metal halide, at least one or more of halides of rare-earth metals including cerium, neodymium, praseodymium, dysprosium, holmium, thulium and lutetium, and that, sodium halide by less than 25% to the sum total of the metal halide are to be contained in an arc tube made of quartz glass equipped with a pair of electrodes. COPYRIGHT: (C)2010,JPO&INPIT
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