METAL-HALIDE DISCHARGE LAMP FOR PROJECTION PURPOSES

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A metal halide discharge lamp for projection purposes with a light-transpare nt discharge vessel in which two electrodes stand opposite one another, contain s anionizable filling, comprised of mercury, inert gas, halogen, a rare-earth metal (RE), preferably dysprosium, as well as niobium. Arc instability is very small due to the niobium, even with specific arc powers of up to 200 W per mm of arc length. With a color temperature of 5000 K, luminous densities of more than 45 kcd/cm are obtained. In addition, cesium can be added optionally for the highest specif ic arc powers.