H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/43
H05B 41/24 (2006.01) H05B 41/30 (2006.01)
Patent
CA 1095116
LD-7122 ABSTRACT OF THE DISCLOSURE High pressure sodium vapor lamps containing sodium or both sodium and mercury are raised in color temperature and improved in color rendition by pulse operation. During the pulse there is considerable enhancement and broadening of the sodium lines at 449, 467, 498 and 568 nm., and the development of a continuum from 400 to 450 nms., and also the appearance of visible mercury lines in lamps containing mercury. Optimum results with lamps in size ratings from 50 to 1000 watts are obtained with pulse repetition rates from 500 to 2000 hz. and duty cycles from 10 to 30°. The color temperature may be increased from the common value of 2050°K to as high as 2700°K with subsantially no re- duction in efficacy, or even higher if some reduction is efficacy is acceptable.
275374
Company General Electric
Eckersley Raymond A.
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