Automatic energy control lighting system with automatically vari

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

1976-07-19

1977-02-22

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

315151, 315144, 315158, G01J 132, H05B 4136

Patent

active

040093875

ABSTRACT:
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.

REFERENCES:
patent: 3558892 (1971-01-01), Seeley
patent: 3599037 (1971-08-01), Grace
patent: 3609451 (1971-09-01), Edgerly, Jr.
patent: 3681654 (1972-08-01), Quinn
patent: 3894265 (1975-07-01), Holmes et al.
Prot: IBM Technical Disclosure Bulletin, vol. 7, No. 9, 2/65, p. 841.

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