Fluorescent lighting system

Details Fluorescent lighting system Fluorescent lighting system

1988-10-11

1991-02-12

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Plural load device systems

Plural discharge device loads

315210, 315317, 315318, 315319, 315295, HO5B 4138

Patent

active

049927051

ABSTRACT:
A fluorescent lighting system capable of providing three levels of illumination includes a first circuit in which a line voltage supply is connected to an electronic ballast which drives four fluorescent lamps. Each fluorescent lamp serves as the center lamp in one of four three-lamp parabolic fixtures. A second circuit is comprised of a second line voltage source connected in parallel with two similar electronic ballasts which drive the side fluorescent lamps in the three-lamp parabolic fixtures. When the first circuit is powered, the center lamps in all parabolic fixtures are illuminated to provide a first level of illumination. When the second circuit is powered, the side lamps in all parabolic fixtures are illuminated to provide a second level of illumination. A third level of illumination is provided when both the first and second circuits are powered and all three lamps in all four parabolic fixtures are illuminated.

REFERENCES:
patent: 3778676 (1973-12-01), Keller
patent: 4006384 (1977-02-01), Elms et al.
patent: 4234820 (1980-11-01), Widmayer
patent: 4277726 (1981-07-01), Burke
patent: 4475062 (1984-10-01), Radenkovich et al.
patent: 4488092 (1984-12-01), Chikuma
patent: 4641061 (1987-02-01), Munson

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