Electric lamp and discharge devices: systems – With radiant energy sensitive control means
Patent
1995-04-03
1996-12-03
Gonzalez, Frank
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
315224, 315291, 315308, 315DIG4, H05B 3702
Patent
active
055811582
ABSTRACT:
A compact auxiliary circuit modifies the operation of a low-voltage control circuit associated with an electronic dimming gas discharge lamp ballast. The auxiliary circuit modifies the output of the control circuit to reduce the brightness of the lamps when excess ambient light is available, and increases the brightness of the lamps as available ambient light is reduced. The auxiliary circuit is located in a small housing which mounts in a knockout plug of a fluorescent ceiling fixture. In a preferred embodiment, the auxiliary circuit includes a photocell that obtains information on ambient light levels through an ambient light gathering prism mounted through a ceiling tile near the fixture, and connected to the circuit housing by a flexible fiber optic cable. A single auxiliary circuit according to the invention can be connected to vary the brightness of a large number of lamps.
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Lamp Intensity Control, I.B.M. Technical Disclosure Bulletin, vol. 8, No. 8, Jan. 1966.
Etta Industries, Inc.
Ferguson Jr. Gerald J.
Gonzalez Frank
Ratliff Reginald A.
Smith Evan R.
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