METAL-HALIDE LAMP AND LIGHTING DEVICE

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PROBLEM TO BE SOLVED : To provide a metal-halide lamp with an improved start-up property. SOLUTION : The metal-halide lamp is provided with an arc tube part 11 forming a discharge space 14, a transparent airtight vessel 1 having a pair of sealing parts 121, 122 formed at either side of the arc tube part 11, a discharge medium 15 essentially not containing mercury with metal halide and rare gas sealed in the discharge space 14, metal foils 21, 22 sealed to the sealing parts 121, 122, and a pair of electrodes 31, 32 with base ends connected to the metal foils 21, 22, and tip ends arranged in opposition inside the discharge space 14. On an outer surface of the arc tube part 11, a conductive film 5 is formed almost continuously from an interface between the arc tube part 11 and the pair of sealing parts 121, 122 to the other interface. COPYRIGHT : (C)2007, JPO&INPIT