Metal-halide discharge lamp for projection purposes

Details Metal-halide discharge lamp for projection purposes Metal-halide discharge lamp for projection purposes

H - Electricity

01

J

H01J 61/20 (2006.01) H01J 61/12 (2006.01) H01J 61/86 (2006.01)

Patent

CA 2182423

A metal halide discharge lamp for projection purposes with a light-transparent discharge vessel in which two electrodes stand opposite one another, contains an ionizable 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/cm2 are obtained. In addition, cesium can be added optionally for the highest specific arc powers.

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