Automatic light dimmer for gas discharge lamps

Details Automatic light dimmer for gas discharge lamps Automatic light dimmer for gas discharge lamps

1994-03-21

2000-09-26

Shingleton, Michael B

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315360, 315DIG4, 315194, 315276, H05B 3702

Patent

active

061246840

ABSTRACT:
A power saving dimming apparatus for gas discharge lamps activates a system of gas discharge lamps through a phototransistor network sensitive to the infrared spectrum rather than the normal visible spectrum. The phototransistor network allows power to be supplied to the apparatus, resulting in the turning on of the lamps whenever daylight conditions exist which are insufficient to produce infrared light. When power is applied to the apparatus, either at initial turn on or after a momentary interruption, the apparatus applies full power to the primaries of the lamp ballasts for a preselected time period, thus ensuring all the lamps in the system light. After the preselected time period has passed, the apparatus automatically dims the lamps and maintains them in the dimmed state.

REFERENCES:
patent: 3944876 (1976-03-01), Helmuth
patent: 4147961 (1979-04-01), Elms
patent: 4697122 (1987-09-01), Hoffer
patent: 4950963 (1990-08-01), Sievers
patent: 5043635 (1991-08-01), Talbott et al.

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