Lighting system having dimming capabilities

Details Lighting system having dimming capabilities Lighting system having dimming capabilities

1976-12-28

1978-03-21

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Multiple filament load devices

315 64, 315 67, 315320, 313316, H01J 744, H01J 1346, H01J 1734, H01J 1978

Patent

active

040805484

ABSTRACT:
A lighting system provided with a plurality of filaments, the wattage ratings of which differ in a predetermined relationship. The filaments are selectively energized so that the light intensity of the lamp may be varied in steps, without a change in color temperature which otherwise results when the intensity is varied in response to a varying voltage applied to a single filament.

REFERENCES:
patent: 1513407 (1924-10-01), Lombos
patent: 1819690 (1931-08-01), Ricker
patent: 2217794 (1940-10-01), Davis, Jr.
patent: 2874331 (1959-02-01), Otto
patent: 3408523 (1968-10-01), Demarest et al.
patent: 3416020 (1968-12-01), Carley
patent: 3508114 (1970-04-01), Johansson et al.
patent: 3579030 (1971-05-01), Bentham et al.

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