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Plant illumination system

  • US 10,653,073 B2
  • Filed: 05/16/2019
  • Issued: 05/19/2020
  • Est. Priority Date: 03/17/2011
  • Status: Active Grant
First Claim
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1. A lighting system, comprising:

  • a housing defining a dark cavity with zero sunlight therein; and

    at least one horticultural lighting fixture configured to emit a spectrum includinga first spectral feature in the form of a spectral peak having its peak wavelength in the blue wavelength range of 425-475 nm,a second spectral feature in the form of a spectral valley having its base value in the cyan wavelength range of 475-500 nm,a third spectral feature in the form of a broad-band spectral feature extending throughout the green wavelength range of 500-600 nm,a fourth spectral feature in the form of a spectral peak having its peak wavelength in the red wavelength range of 625-675 nm, anda fifth spectral feature in the far-red wavelength range of 700-800 nm,whereinthe fourth spectral feature has a maximum relative emission intensity that is the highest relative emission intensity within the spectrum,the first spectral feature has a highest relative emission intensity that is non-zero but less than the maximum relative emission intensity,the third spectral feature has a highest relative emission intensity that is non-zero but less than the maximum relative emission intensity,the base value of second spectral feature is below all relative intensities of the third spectral feature, andthe fifth spectral feature has a non-zero relative intensity that is below the maximum relative intensity.

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