Light admitting means for photocell-controlled lighting fixture

Details Light admitting means for photocell-controlled lighting fixture Light admitting means for photocell-controlled lighting fixture

1975-09-08

1977-05-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, 350 96R, G02B 514

Patent

active

040230341

ABSTRACT:
Fixed indoor ceiling-mounted lighting fixtures can be inexpensively and simply dimmed automatically in response to natural daylight availability, by photocell-controlled relay.
An illustration of the technique is shown for modification of a two-ballast four-lamp fluorescent fixture, to reduce consumption of electrical energy by fifty percent when daylight permits.

REFERENCES:
patent: 3051035 (1962-08-01), Root
patent: 3153172 (1964-10-01), Sun Ling
patent: 3274392 (1966-09-01), Harling
patent: 3621269 (1971-11-01), Misencik
patent: 3892962 (1975-07-01), Whited

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