THORIUM-FREE QUARTZ METAL HALIDE LAMPS

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A thorium-free quartz metal halide lamp including an outer lamp envelope (120) defining an envelope space (122); a base (130) sealably connected to the outer lamp envelope (120); a discharge vessel (110) defining an inner discharge space (112), the discharge vessel (110) being disposed in the envelope space (122); at least two electrodes (114) projecting into the inner discharge space (112), the at least two electrodes (114) being thorium-free; and filling material disposed in the inner discharge space (112), the filling material including sodium iodide and at least one rare earth iodide, the filling material being thorium-free.