Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Patent
1994-12-29
1996-09-03
Patel, Nimeshkumar D.
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
313112, H01J 6135, H01J 6140
Patent
active
055526659
ABSTRACT:
An electric lamp having a luminescent layer on the lamp envelope which produces visible light when impinged by ultraviolet radiation generated within the lamp. An undercoat for the luminescent layer increases the luminous efficacy of the lamp. The undercoat comprises an agglomerated particulate material of predominantly gamma alumina having a primary crystallite size of less than about 0.05 .mu.m. The undercoat is effective to increase the luminous efficacy of certain fluorescent lamps so that they meet the minimum efficacy requirements of the Energy Policy Act of 1992.
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Patel Nimeshkumar D.
Philips Electronics North America Corporation
Wieghaus Brian J.
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