| 摘要 |
PROBLEM TO BE SOLVED: To provide a ceramic metal halide lamp high in efficiency, prevented from extinction and having a long service life with little change in lamp characteristics during light control. SOLUTION: The metal halide lamp comprises an arc tube 7 with a pair of electrode parts 25, 27 held in a light transmitting ceramic discharge container 23 filled with rare gas and a halide serving as a luminescent substance. The halide contains at least cerium halide 29, and a metallic compound 30 having a melting point of 680°C or lower and a boiling point of 1,550°C or higher is filled in the discharge container 23. COPYRIGHT: (C)2008,JPO&INPIT
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