THALLIUM IODIDE-FREE CERAMIC METAL HALIDE LAMP

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PROBLEM TO BE SOLVED : To provide a discharge lamp capable of being operated at less than the full rated power without suffering undesirable color shift, loss of lumen maintenance or loss of lamp efficacy. SOLUTION : A ceramic metal halide lamp fill is free of halides of thallium but includes : (a) an inert gas, (b) mercury, and (c) a further halide component including : (i) an alkali metal halide, (ii) an alkaline earth metal halide, and (iii) at least one of a rare earth halide selected from the group consisting of lanthanum and cerium, and optionally praseodymium, neodymium, and samarium, and a combination thereof. COPYRIGHT : (C)2012, JPO&INPIT