| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high pressure discharge lamp emitting white light with high efficiency and high color rendering, having a stable life characteristics with small variation of characteristics depending on the lighting direction, using a ceramic arc tube hardly generating fade-out. SOLUTION: At least rare earth metal halide and sodium halide are filled inside the ceramic arc tube as a filling material, and the weight ratio of neodymium halide contained in the rare earth metal halide against the total quantity of the rare earth metal halide is 1-25%, and the weight ratio of the sodium halide against the rare earth metal halide is 10-50%. The high pressure discharge lamp emits light with correlated color temperature of 5,000-7,000K. COPYRIGHT: (C)2005,JPO&NCIPI
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