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Method and apparatus for controlling plant growth with artificial light

  • US 5,269,093 A
  • Filed: 12/02/1991
  • Issued: 12/14/1993
  • Est. Priority Date: 11/30/1990
  • Status: Expired due to Term
First Claim
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1. An apparatus for controlling growth of plants, comprising:

  • a growth chamber to contain the plants,a lighting fixture including a plurality of light sources for irradiating the plants,wherein each of said plurality of light sources of said lighting fixture is switched and controlled and said plurality of light sources generate light wherein a ratio of photon flux density in a first range of 660±

    5 nm to 730±

    5 nm is 0.1 to 15.0, in a second range of 600-700 nm to 700-800 nm is 0.5 to 7.0, and in a third range of 400-700 nm to 700-8000 nm is 1.0 to 22.0.

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