A high-pressure discharge lamp which is suitable for motor vehicle
headlights, has an improved color point stability close to the black body
locus, a high color temperature, and a high luminous efficacy (lm/w). The
high-pressure discharge lamp includes an inner vessel with a discharge
chamber, with at least two electrodes extending into the discharge
chamber, and an outer bulb surrounding the inner vessel. The discharge
chamber contains an ionizable filling including at least one rare gas,
0-10 mg of mercury, and a metal halide mixture. The metal halide mixture
includes 40-80% by weight of sodium halide, 25-55% by weight of scandium
halide, 1-15% by weight of indium halide, and 0-34% by weight of thallium
halide.