Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy controlled regulation of the current supply...
Patent
1981-11-27
1987-09-22
Moore, David K.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy controlled regulation of the current supply...
315149, 315134, H05B 3702
Patent
active
046957693
ABSTRACT:
A photosensor for detecting the light intensity of an external light source, usually the sun, which is illuminating an area is used as the sensor for a control network of an artificial lighting system for that same area to compensate for light intensity variations. The voltage output from the photosensor is applied to a logarithmic-to-linear device which is used as an input to a comparator for producing an inverse output that drives the artificial lighting system. The logarithmic-to-linear device inserts an element into the overall control system that provides compensation that corresponds to the perceived linear light change of intensity that actually occurs when there is an actual logarithmic light change.
REFERENCES:
patent: 3582659 (1971-06-01), Dekker
patent: 3723014 (1973-03-01), Nanba
patent: 3971984 (1976-07-01), Bench
patent: 4233564 (1980-11-01), Kerbel
patent: 4236101 (1980-11-01), Luchaco
Moore David K.
Wide-Lite International
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