Constant color temperature and intensity illumination source

Details Constant color temperature and intensity illumination source Constant color temperature and intensity illumination source

1988-12-05

1990-05-01

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

315151, G05D 2500

Patent

active

049220896

ABSTRACT:
A source of illumination of constant color temperature and intensity including a lamp the color temperature of the light from which is dependent on the power applied to the lamp. There is a device for measuring the intensity of portions of the spectrum of the light and for providing signals indicative of those intensities. Means responsive to the signals adjust the power to achieve the selected color temperature. A light modulator adjusts the intensity without affecting color temperature. There is a spherical mirror centered on the lamp and the modulator is located between the lamp and the mirror and controls the brightness of the image of the lamp formed on the lamp by the spherical mirror.

REFERENCES:
patent: 3650624 (1972-03-01), Yamada
patent: 3986022 (1976-10-01), Hyatt
patent: 4449821 (1984-05-01), Lee
patent: 4692607 (1987-09-01), LaBelle et al.

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