Electric lamp and discharge devices: systems – Discharge device load – Plural gases or vapors in the discharge device
Patent
1984-10-05
1986-07-15
Dixon, Harold
Electric lamp and discharge devices: systems
Discharge device load
Plural gases or vapors in the discharge device
313571, 313573, 313634, 313639, 313642, 315200R, H01J 1720, H01J 1104
Patent
active
046008624
ABSTRACT:
A high-pressure sodium lamp is connected to a d.c. power supply through a ballast, to operate it with a current containing a d.c. component. The relation between the ratio l/d of the inter-electrode distance l (mm) to the inner diameter d (mm) of the arc tube of the high-pressure sodium lamp and the sodium vapor pressure P.sub.Na (kPa) in the arc tube is maintained at P.sub.Na .gtoreq.6.0 (l/d-5.8), thus making it possible to operate the high-pressure sodium lamp with a current containing a d.c. component without causing a significant color separation which otherwise might be the result of cataphoresis.
REFERENCES:
patent: 2094694 (1937-10-01), Bol et al.
patent: 3054922 (1962-09-01), Louden et al.
patent: 3898504 (1975-08-01), Akutsu et al.
patent: 4539513 (1985-09-01), Ganser et al.
Ito Kazuhiko
Katsura Takashi
Koyama Kazutaka
Ogata Yoshiro
Ozawa Masataka
Dixon Harold
Matsushita Electric - Industrial Co., Ltd.
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