Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy controlled regulation of the current supply...
Patent
1980-10-23
1982-08-31
Dixon, Harold A.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy controlled regulation of the current supply...
315308, H05B 3702
Patent
active
043474616
ABSTRACT:
A circuit for controlling the power supplied to a lamp includes a sensor, located at the lamp, which measures the portion of the lamp's output which is reflected from an illuminated area. This sensor is connected to a sensing circuit which measures the reflectance of the illuminated area. Using this reflectance measurement, the total illumination incident on a work space, both from the light source and from other illumination sources, is determined and this total incident illumination is adjusted by adjusting the power supplied to the light source to provide a controlled illumination. The ability to measure reflectance of the illuminated area using a sensor at the light source itself permits the manufacture of a light source which will self-adjust to illuminate a work area at a desired incident illumination level, without adjustment of the light after installation, and without a requirement that the light source be adjusted if the reflectance of the work area changes.
REFERENCES:
patent: 4009387 (1977-02-01), Nuver
patent: 4236101 (1980-11-01), Luchaco
patent: 4273999 (1981-06-01), Pierpoint
Dixon Harold A.
Elving Robert L.
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