Metal halide lamp with an ionizable filling comprising at least one inert gas, mercury and metal ha

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A metal halide fill for forming an ionizable fill comprises at least one inert gas, mercury and metal halides, the fill comprising the constituents Hg halide, Na halide, Tl halide and halides of the rare earths. This fill may be contained in particular in the discharge vessel of a metal halide lamp which has an outer bulb.