Excess light turn-off circuit

Details Excess light turn-off circuit Excess light turn-off circuit

1983-02-23

1984-05-15

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Electric switch controlled by the radiant energy responsive...

250205, 250214AL, 315158, 315360, H05B 3702

Patent

active

044490747

ABSTRACT:
An illumination control device controls the level of artificial lighting depending upon the intensity of natural light in the area being controlled. A single adjustment is used to set the switching point at which the illumination control device becomes operative. An indicator is provided to indicate the adjustment status before a change in the artificial light condition occurs. A filter is employed to produce turn-on and turn-off time delays which differ from one another and are automatically changed in accordance with the instantaneous light level which exists prior to a necessary circuit switching operation.

REFERENCES:
patent: 4135116 (1979-01-01), Smith
patent: 4236101 (1980-11-01), Luchaco
patent: 4346331 (1982-08-01), Hoge

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