Plant illumination system
First Claim
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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Accused Products
Abstract
An improved method to produce artificial light for plant cultivation, an illumination device with a semiconductor light emission solution and device suited for plant cultivation in a greenhouse environment are described. The best mode is considered to be a lighting device with binary alloy quantum dots (110, 120, 130, 140, 150, 160) made by colloidal methods to produce a size distribution of quantum dots that produces an emission spectrum similar to the photosynthetically active radiation (PAR) spectrum. The methods and arrangements allow more precise spectral tuning of the emission spectrum for lights used in plant (310, 311) cultivation. Therefore unexpected improvements in the photomorphogenetic control of plant growth, and further improvements in plant production are realized.
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Citations
10 Claims
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1. A lighting system, comprising:
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a housing defining a dark cavity with zero sunlight therein; and at least one horticultural lighting fixture configured to emit a spectrum including a 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, and a fifth spectral feature in the far-red wavelength range of 700-800 nm, wherein the 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, and the fifth spectral feature has a non-zero relative intensity that is below the maximum relative intensity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification