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Photoelectric load control system and method

  • US 5,895,986 A
  • Filed: 04/30/1997
  • Issued: 04/20/1999
  • Est. Priority Date: 04/30/1997
  • Status: Expired due to Term
First Claim
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1. A photoelectric load control system for applying power to a light as a function of light level and as a function of the length of each night, the system comprising:

  • switching means for selectively applying power to the light for turning the light on and off;

    light sensitive means for providing a signal which varies between a first state and a second state in response to the light level; and

    processor means, responsive to said signal, for activating said switching means, said processor including;

    means for activating said switching means to turn the light on in response to one of the said states,means for timing the total length of night each night,means for computing the period of darkness after the light is turned on,means for determining when the computed period of darkness equals or exceeds a predetermined percentage of the timed total length of night, andmeans, responsive to the means for determining, for activating said switching means to turn the light off after the computed period of darkness equals or exceeds the predetermined percentage of the total length of night.

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