Patent ID: 6107742
Filing Date: 2000-08-22
Classification: H01J

Abstract:
A metal halide lamp comprising a pair of electrodes and a discharge vessel filled with:at least one metal halide comprising at least one rare earth metal halide;halogen in excess of the stoichiometry of said metal halide(s);mercury; anda rare gas;wherein the amount of said mercury is between 7.7 mg/cc and 9.9 mg/cc, said excess halogen is 25-100% (in terms of atoms) of the halogen included in said metal halide(s), and the rated tube power for a 200V rated tube voltage is 200 W-3000 W, andwherein said metal halide comprises at least one rare earth metal selected from the group consisting of Dy, Tm and Ho, at least one element selected from the group consisting of Tl and Cs, and at least one halogen.