Variable photoelectric cell

Details Variable photoelectric cell Variable photoelectric cell

1979-09-25

1981-07-28

Lechert, Jr., Stephen J.

Illumination

Automatic substitution of power supply or light source

362145, 362276, 362254, F21V 1904

Patent

active

042813654

ABSTRACT:
An illumination control device for regulating the illumination in a controlled lighting area responds to natural illumination to control artificial lighting. The illumination control device turns the artificial light on and off at independently variable natural illumination levels to provide a hysteresis between the turn-on and turn-off points of the artificial lights. In addition, a variable time delay is included in the illumination control device to delay the turn-off of the lights for a variable period of time after the natural light level has risen above the level required for artificial light turn-off. Furthermore, the illumination control device includes a circuit for turning on all of the lights, regardless of the natural illumination level, when the circuit is initially energized so that the lights can be checked by maintenance personnel.

REFERENCES:
patent: 4152752 (1979-05-01), Niemi

Affiliated with

Also associated with

Rating

Variable photoelectric cell does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Variable photoelectric cell, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable photoelectric cell will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-551664