Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1977-06-13
1979-01-30
Chatmon, Jr., Saxfield
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
313220, 313227, 315107, 315105, H05B 3702, H05B 3904, H05B 4136
Patent
active
041374843
ABSTRACT:
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 35%. The color temperature may be increased from the common value of 2050.degree. K to 2500.degree. K with reduction in lamp efficacy of only about 20% from conventional 60 Hz operation. Even higher color temperatures may be obtained if further reduction of efficacy is acceptable.
REFERENCES:
patent: 3707649 (1972-12-01), Kottenstette
patent: 3898504 (1975-08-01), Akutsu et al.
patent: 3914649 (1975-10-01), Hug
patent: 4052636 (1977-10-01), Strok
Chatmon, Jr. Saxfield
General Electric Company
Kempton Lawrence R.
Legree Ernest W.
Neuhauser Frank L.
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