Electric lamp and discharge devices: systems – Electric switch in the supply circuit
Patent
1982-05-11
1986-06-03
Moore, David K.
Electric lamp and discharge devices: systems
Electric switch in the supply circuit
315360, 315307, H02B 108
Patent
active
045932344
ABSTRACT:
An apparatus for controlling illuminating lamps. Ambient light of the surroundings is sensed, and a timer is turned on when the ambient light falls below a predetermined level. When the timer times out, the illuminating lamps are turned on provided that the ambient light is still below a predetermined level. A second timer is activated which turns the illuminating lamps off automatically a predetermined time after they are turned on regardless of the ambient light level. Before the lamps are turned off, a warning signal is issued to allow people using the illumination time to leave. The warning may be audible or may comprise flashing or dimming the illuminating lamps for a predetermined time. The intensity of each illuminating lamp can be independently varied to accommodate different lighting requirements.
REFERENCES:
patent: 4151515 (1979-04-01), Pease et al.
patent: 4172998 (1979-10-01), Beling et al.
patent: 4198563 (1980-04-01), Elssner
patent: 4209728 (1980-06-01), Membreno
patent: 4242614 (1980-12-01), Vatis et al.
patent: 4249160 (1981-02-01), Chilvers
patent: 4292570 (1981-09-01), Engel
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