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Photoelectric lamp control with timer adjustable by light blockage

  • US 6,194,847 B1
  • Filed: 04/21/1999
  • Issued: 02/27/2001
  • Est. Priority Date: 04/21/1999
  • Status: Expired due to Fees
First Claim
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1. A light control apparatus comprising:

  • a light sensing means which produces an input signal representative of the amount of light present at said sensing means;

    logic means for comparing said input signal with a prescribed signal value and for comparing the rate of change of said input signal with a prescribed rate of change, for selecting between a programming mode and a normal mode of operation according to said comparisons, and for providing output signals for each of said modes; and

    a power switching means coupled between a source of electrical power and a load which controls the application of said power to said load in response to said output signal from said logic means.

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