Dimmable metal halide HID lamp with good color consistency

Details Dimmable metal halide HID lamp with good color consistency Dimmable metal halide HID lamp with good color consistency

2007-07-17

2007-07-17

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Having a particular total or partial pressure

C313S637000, C313S643000, C313S568000, C313S570000

Reexamination Certificate

active

11103080

ABSTRACT:
Metal halide lighting with good color during dimming may be obtained. An appropriate balance of commonly used metal halides (NaI, DyI3, CeI3, CaI2, TlI) is dosed in the lamp. No mercury is used. A higher than typical xenon fill pressure from 50 to 500 Kilopascals may be used to help control thermal properties and voltage. If necessary, modulation of the power at acoustic resonance frequencies may be used to straighten and center the arc. Efficient and pleasant white output is obtained. As the power is reduced, the chromaticity either (1) remains fairly constant or (2) drifts acceptably towards warm pinkish colors. Large factors of attenuation in output can be realized. The lumen output was reduced by at least a factor of twenty in one sample as the power was dimmed from 70 to 20 watts.

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patent: 2005/0179401 (2005-08-01), Stockwald
patent: 2005/0248279 (2005-11-01), Lambrechts et al.

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