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Light sources and methods for illuminating plants to achieve effective plant growth

  • US 8,826,589 B2
  • Filed: 06/06/2012
  • Issued: 09/09/2014
  • Est. Priority Date: 06/06/2012
  • Status: Active Grant
First Claim
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1. A method of growing a plant or a plant propagule, comprising:

  • obtaining said plant or said plant propagule and an electrically-powered light source;

    powering said electrically-powered light source with an amount of input power to generate an incident light;

    illuminating, for a period of time, a growth area of said plant or said plant propagule with said incident light having a spectral profile defined by a first set of wavelengths, a second set of wavelengths and a third set of wavelengths;

    achieving, using said incident light, a dry weight from growth of said plant or said plant propagule that is greater than that achieved if said growth area of said plant or said plant propagule was grown by illuminating using another incident light with said amount of input power for substantially said period of time, and said another incident light includes said first set of wavelengths and said third set of wavelengths, but does not include said second set of wavelengths;

    wherein said dry weight refers to a weight of partial or entire grown said plant or said plant propagule obtained after drying such that grown said plant or said plant propagule is substantially free of moisture, and wherein said first set of wavelengths includes wavelengths that are between about 400 nm and about 470 nm, said second set of wavelengths includes wavelengths that are between about 526 nm and about 570 nm, and said third set of wavelengths includes wavelengths that are between about 626 nm and about 700 nm, andwherein said first set of wavelengths comprises between about 12% and about 16% of said light illuminating said plant or plant propagule and said second set of wavelength comprises between about 19% and about 25% of said light illuminating said plant or plant propagule and said third set of wavelength comprises between about 27% and about 35% of said light illuminating said plant or plant propagule.

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