Automatic energy control lighting system with automatically...

Details Automatic energy control lighting system with automatically... Automatic energy control lighting system with automatically...

H - Electricity

05

B

315/42

H05B 41/38 (2006.01) G05D 25/02 (2006.01) H05B 41/392 (2006.01)

Patent

CA 1071294

ABSTRACT OF THE DISCLOSURE An automatically variable d.c. voltage source supplies a control signal to a dimmer circuit that controls the brightness of a high intensity gas discharge lamp in response to a varying d.c. voltage. The automatically variable d.c. voltage source produces a varying d.c. voltage at its output which is functionally related to the difference between a voltage from a stable reference voltage source and a voltage produced by a photocell circuit which is responsive to the light level of an area illuminated by the lamp controlled by the dimmer circuit. The variable d.c. source includes circuitry for indicating relamping conditions.

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