	US 12,185,680 B2
	Red and far-red light ratio during growth of basil
Celine Catherine Sarah Nicole, Eindhoven (NL)
Assigned to SIGNIFY HOLDING B.V., Eindhoven (NL)
Appl. No. 17/801,679
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed Feb. 26, 2021, PCT No. PCT/EP2021/054796 § 371(c)(1), (2) Date Aug. 23, 2022, PCT Pub. No. WO2021/170783, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 20159978 (EP), filed on Feb. 28, 2020.
Prior Publication US 2023/0128621 A1, Apr. 27, 2023
Int. Cl. A01G 22/15 (2018.01); A01G 7/04 (2006.01); H05B 47/16 (2020.01)

CPC A01G 7/045 (2013.01) [A01G 22/15 (2018.02); H05B 47/16 (2020.01)]

14 Claims

1. A horticulture lighting arrangement, comprising a lighting system configured to provide horticulture light having a controllable spectral power distribution, and a control system configured to control the spectral power distribution of the horticulture light; wherein in an operational mode of the horticulture lighting arrangement the horticulture lighting arrangement is configured to provide the horticulture light according to an on-off schedule wherein consecutively an on-period and an off-period are applied, wherein:

the horticulture light comprises one or more of first horticulture light comprising a wavelength selected from the range of 400-600 nm, red light comprising a wavelength selected from the range of 600-700 nm, and far-red light comprising a wavelength selected from the range of 700-800 nm;

the on-period lasts in the range of 12-20 hours and the off-period lasts in the range of 4-12 hours, wherein the on-period comprises an end-of-day period at the end of the on-period, wherein the end-of-day period lasts in the range of 0.5-4 hours;

wherein during a substantial part of the on-period before the end-of-day period a R/Fr ratio, defined as a ratio of light intensity of the red light in terms of μmol/m²/s of photons in the wavelength range selected from the range of 600-700 nm to light intensity of the far-red light in terms of μmol/m²/s of photons in the wavelength range selected from the range of 700-800 nm, is selected from the range of 4-20, and during a substantial part of the end-of-day period the R/Fr ratio is selected from the range of 0.1-4,

wherein the R/Fr ratio during said substantial part of the on-period is larger than the R/Fr ratio during said substantial part of the end-of-day period,

wherein a contribution of the far-red light to the horticulture light during said substantial part of the end-of-day period is substantially higher than a contribution of the far-red light to the horticulture light during said substantial part of the on-period,

wherein the horticulture lighting arrangement is configured to provide during the on-period the horticulture light with an average intensity selected from the range of 100-600 μmol/m²/s, and

wherein the horticulture light during the substantial part of the on-period before the end-of-day period comprises 5-20% of the photons in wavelength range of 400-500 nm, 0-30% of the photons in wavelength range of 500-600 nm, 50-95% of the photons in wavelength range of 600-700 nm, and 0-6% of the photons in wavelength range of 700-800 nm, and the horticulture light during the substantial part of the end-of-day period comprises 0-10% of the photons in wavelength range of 400-500 nm, 0-15% of the photons in wavelength range of 500-600 nm, 0-80% of the photons in wavelength range of 600-700 nm, and 20-100% of the photons in wavelength range of 700-800 nm.