Metal halide lamp and lighting apparatus
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United States of America Patent
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Mar 3, 2015
Grant Date -
Mar 20, 2014
app pub date -
Jul 26, 2011
filing date -
Jul 26, 2011
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Abstract
Provided is a metal halide lamp having a ceramics arc tube, wherein a rated power is 35 to 100 W and a color temperature is 2800 to 3700 K, wherein halogen additives as light emission materials are included in the arc tube, wherein the halogen additives consists of (1) cerium (Ce); (2) sodium (Na); (3) calcium (Ca); (4) thallium (Tl); and (5) rare earth metal comprising at least one of dysprosium (Dy), thulium (Tm), and holmium (Ho), and the halogen additives are iodide compounds, wherein, for respective composition ratios of the halogen additives for (1) to (4), cerium iodide is 1.5 mol % to 3.0 mol %; sodium iodide is 45 mol % to 90 mol %; calcium iodide is 5 mol % to 15 mol %; and thallium iodide is 2 mol % to 7 mol %.
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