HIGH-PRESSURE DISCHARGE LAMP AND IMAGE PROJECTION DEVICE USING THE SAME

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This invention provides a high-pressure discharge lamp comprising a light transparent bulb having a hermetically sealed discharge space, opposed electrodes provided in the discharge space, and a discharge medium sealed in the discharge space. The discharge medium comprises at least one first halide selected from Sc and/or rare earth metals other than Sc, a second halide of at least one of Fe, Zn, and Al, which has relatively high vapor pressure, and a rare gas, and is substantially free from mercury. The high-pressure discharge lamp is characterized in that not less than 30% by weight of the first and second halides is accounted for by a bromide.