| 摘要 |
An arc tube (6) of a metal halide lamp (1) has a ceramic envelope (10), a pair of electrodes (16), and metal halides enclosed therein. The arc tube (6) satisfies the relationship EL/Di>4.0, where EL represents the distance between the pair of electrodes (16) in mm, Di represents the maximum inside diameter of the arc tube (6) measured in mm at a portion positionally corresponding to the gap between the pair of electrodes (16). In addition, the metal halides enclosed within the arc tube (6) include at least sodium halide and neodymium halide. With this configuration, the metal halide lamp (1) achieves an improved emission color characteristic, while maintaining high lamp efficiency.
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