High intensity discharge lamp for use in e.g. road lighting, has tungsten electrodes extending into

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A lamp (10) closes a discharge vessel (12) a. Tungsten electrodes (20, 22) extend into the discharge vessel (12). A ionizable filling (18) is within the vessel (12) sealed. The filling (18) a buffer gas closes and a halide component a, including a rare earth halide. A source (40) of oxygen, which includes a lanthanide oxide is in the discharge vessel (12) present. The source (40) is for a regenerative cycle ready oxygen of oxygen, of the darkening of the tungsten from the electrodes by lamp walls (20, 22) reduced.