Lamp with controllable spectral output

Details Lamp with controllable spectral output Lamp with controllable spectral output

1995-06-07

1998-09-08

Powell, Mark R.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

313638, 313 35, H01J 6112, H01J 6504, H01J 6152

Patent

active

058049223

ABSTRACT:
The spectral energy characteristic of a discharge lamp is controlled by changing the density of the fill substance. The spectral characteristic can be shifted while substantially maintaining its shape by changing the density of the fill. A sulfur or selenium containing discharge lamp which is operated at a pressure of at least about 1 atmosphere contains a low ionization potential substance in the fill. Characteristics which are improved are one or more of spatial color uniformity, extinguishing characteristics, and bulb starting reliability. Particular substances which are added to the fill are alkalai metal containing substances, III B metal containing substances, and alkaline earth metal containing substances. When light is reflected back into the bulb, the light which is re-emitted is stronger in the higher wavelengths.

REFERENCES:
patent: 3911318 (1975-10-01), Spero et al.
patent: 4501993 (1985-02-01), Mueller et al.
patent: 4695757 (1987-09-01), Ury et al.
patent: 4918352 (1990-04-01), Hess et al.
patent: 4978891 (1990-12-01), Ury

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