Warm white fluorescent lamp having good efficacy and color rende

Details Warm white fluorescent lamp having good efficacy and color rende Warm white fluorescent lamp having good efficacy and color rende

1979-07-17

1981-04-21

Demeo, Palmer C.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

H01J 6144

Patent

active

042635306

ABSTRACT:
Fluorescent lamp has warm-white color and both high efficacy and good color rendition. This performance is achieved by utilizing a broad-band-emitting apatite-structured calcium fluorophosphate activated by predetermined percentages of antimony and manganese and narrow red-orange-emitting yttrium oxide activated by a predetermined percentage of tervalent europium.

REFERENCES:
patent: 2488733 (1949-11-01), McKeag et al.
patent: 3602758 (1971-08-01), Thornton et al.
patent: 4075532 (1978-02-01), Piper et al.
patent: 4079287 (1978-03-01), Soules et al.

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