| 摘要 |
In a metal halide lamp, xenon gas having a pressure of at least 3 atmospheres at room temperature and at least a metal halide including indium iodide are sealed in a discharge space not containing mercury. If the volume of the discharge space is denoted by V (mm<SUP>3</SUP>), the electric power applied to the arc tube by P (W), and the weight of the indium iodide by X (mug), these parameters are set so as to satisfy a relationship (P/V)(X/V)<SUP>0.2</SUP>>3.0. A continuous emission spectrum can thereby be produced by indium over the entire visible wavelength range, thus obtaining a mercury-free metal halide lamp that is usable as an excellent white light source suitable for data projectors, automobile lamps, headlights, and other systems and devices.
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