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Method for controlling greenhouse light

  • US 5,818,734 A
  • Filed: 06/12/1996
  • Issued: 10/06/1998
  • Est. Priority Date: 06/12/1996
  • Status: Expired due to Term
First Claim
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1. A method for controlling greenhouse light through selective actuation of a supplemental lighting system disposed in a greenhouse, said supplemental lighting system comprising at least one electric lamp which can be turned on to increase the photosynthetic photon flux (PPF) to which an interior of said greenhouse is exposed, said method comprising the steps of:

  • a) periodically calculating at a plurality of time intervals a desired total target value of the accumulated PPF to which said interior of said greenhouse is to be exposed during said intervals;

    b) periodically determining at said plurality of time intervals the total amount of accumulated PPF to which said interior of said greenhouse is exposed;

    c) comparing said target value of PPF to said determined amount of PPF for each said time interval; and

    d) if said determined amount of PPF exceeds said target value of PPF for any of said time intervals, then turning off said supplemental lighting system at least until the next time interval if it is not already off.

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