| 摘要 |
A metal halide discharge lamp (10) comprises a lamp body (11) and a chamber (14) formed within the body (11). A pair of electrodes (15) and (16) extends into the chamber (14) and have electrode tips (15A) and (16A) spaced apart from one another. A discharge medium composition is sealed within the chamber (14) that generates a plasma, which generates visible light. The composition comprises a rare gas, a first metal halide that produces a luminous flux and a second metal halide that generates a desired lamp operating voltage. The composition may also comprise a metal, sealed in the chamber (14), in elemental form and is not derived from the first metal halide or the second metal halide. The second metal halide serves as a substitute for mercury for purposes of generating desired lamp operating voltage.
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