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US 2012/0056534 A1Published application
Thallium iodide-free ceramic metal halide lamp
AssigneeGeneral Electric Company
InventorLei Deng
Life of this patent
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Abstract
The present disclosure relates to a discharge lamp able to be operated at less than full rated power without suffering undesirable color shift, loss of lumen maintenance or loss of lamp efficacy. It finds particular application in connection with ceramic metal halide lamps having no thallium iodide in the dose thereof.
Claims19
A lamp comprising:
- a discharge vessel;
- electrodes operatively associated with the discharge vessel;
- and
- an ionizable fill sealed within the vessel, wherein the 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 combinations thereof.
7 more elements
A method of forming a lamp, comprising:
- providing a discharge vessel;
- sealing an ionizing fill within the vessel, wherein the 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 combinations thereof;
- and optionally one of indium halide or cesium halide;
- and
- positioning electrodes within the discharge vessel to energize the fill in response to a voltage applied thereto,
- wherein the lamp, when operated at less than 50% of its nominal lamp power, exhibits an MPCD of less than 6.
9 more elements
Dependencies are inferred from the claim text.