Thallium-free metal halide fill for discharge lamps and...

Details Thallium-free metal halide fill for discharge lamps and... Thallium-free metal halide fill for discharge lamps and...

2006-03-14

2006-03-14

Patel, Vip (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

C313S637000

Reexamination Certificate

active

07012375

ABSTRACT:
A thallium-free metal halide fill for ceramic metal halide lamps is provided wherein the fill comprises mercury, sodium iodide, an alkaline earth iodide selected from calcium iodide, strontium iodide, barium iodide, or combinations thereof, and a rare-earth iodide selected from cerium iodide, dysprosium iodide, holmium iodide, thulium iodide, or combinations thereof. In a preferred embodiment, the fill allows dimming of discharge lamps containing same to about 60% of rated power without substantially affecting the color of the emitted light.

REFERENCES:
patent: 5424609 (1995-06-01), Geven et al.
patent: 6404129 (2002-06-01), Hendricx et al.
patent: 6501220 (2002-12-01), Lambrechts et al.
patent: 6525476 (2003-02-01), Geijtenbeck et al.
patent: 6620272 (2003-09-01), Zaslavsky et al.
patent: 6717364 (2004-04-01), Zhu et al.

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