Electric lamp and discharge devices – With gas or vapor – Having a particular total or partial pressure
Patent
1991-02-13
1992-03-17
Yusko, Donald J.
Electric lamp and discharge devices
With gas or vapor
Having a particular total or partial pressure
313573, 313620, 313634, H01J 1728
Patent
active
050971760
ABSTRACT:
The invention relates to a high-pressure sodium discharge lamp which under nominal operating conditions radiates white light with a maximum color rendering index R.sub.a of more than 80. Since the wall load is above 80 W/cm.sup.2 under nominal operating conditions, a color temperature T.sub.c of at least 2800.degree. K. can be achieved with a luminous efficacy of more than 40 lm/W.
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"A New High-Pressure Sodium Lamp with High Color Acceptability", H. Akutsu, Y. Watarai, N. Saito, H. Mizuno, Journal of IES/Jul. 1984, pp. 341-349.
"A New 50 W Super High-Pressure Sodium Lamp-Arc Tube Design and Energy Balance", Y. Ogata and N. Saito, Journal of IES/Summer 1988, pp. 105-117.
De Hair Johannes T. W.
Eerdekens Monique M. F.
Keijser Robertus A. J.
van der Sande Johannes H. M.
Patel N. D.
U.S. Philips Corporation
Wieghaus Brian J.
Yusko Donald J.
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