| 摘要 |
A high-pressure mercury vapor discharge lamp comprises an arc tube in which a pair of electrodes are provided and in which a rare gas as a starting gas, a material from which a free halogen is to be produced during a lighting operation, and mercury are enclosed. The arc tube satisfies X/L>=88, in which X(W) is a lighting operation power and L (mm) is a distance between the electrodes. The high-pressure mercury vapor discharge lamp satisfies the following expression:in which phi (mm) is the inner diameter of the arc tube. Therefore, the high-pressure mercury vapor discharge lamp has a high luminance, a good emission spectrum, and a long life.
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