| 摘要 |
A metal halide lamp according to the present invention includes: an outer tube 2; an inner tube 3 that is provided in the outer tube 2, has a sealing portion 10 in at least one end portion, and is made of quartz glass; an inner tube 3 provided in the outer tube 2; and an arc tube 4 provided in the inner tube 3, wherein assuming that the outer tube 2 has a maximum outer diameter A (mm), the inner tube 3 has a maximum outer diameter B (mm), and the metal halide lamp 1 consumes P (W) of power, the following relationships are satisfied: 0.06 �¢ P + 15.8 ‰ A ‰ 25 , 0.05 �¢ P + 9.0 ‰ B , and 1.14 ‰ A / B ,
where P satisfies 20 W ‰ P ‰ 130W |
