Patent ID: 7486026

Claim:
A lamp comprising: a discharge vessel; electrodes extending into the discharge vessel; and a discharge sustaining fill sealed within the discharge vessel, the fill comprising: mercury; an inert gas; and a halide component comprising: 0.12-0.5 μmol/cm 3 of cesium halide, a total of 0.1-1.6 μmol/cm 3 of at least one of indium halide and thallium halide, a total of 0.3-1.5 μmol/cm 3 of at least one rare earth halide selected from dysprosium halide, holmium halide, neodymium halide and thulium halide, and 0.30-2.0 μmol/cm 3 of gadolinium halide; a total of less than 0.2 μmol/cm 3 of halides other than cesium, gadolinium, thallium, indium, dysprosium, holmium, thulium, mercury, and neodymium, and wherein in operation without a jacket at an arc wall loading of at least 2 watts/mm 2 , the lamp has a color temperature of from 7000K to 14,000K and a color rendering index (Ra) of at least 70.