US Patent No. 10,448,579

LIGHTING DEVICE CAPABLE OF PROVIDING HORTICULTURE LIGHT AND METHOD OF ILLUMINATING HORTICULTURE


Patent No. 10,448,579
Issue Date October 22, 2019
Title Lighting Device Capable Of Providing Horticulture Light And Method Of Illuminating Horticulture
Inventorship Lars Christian Casper, Eindhoven (NL)
Cristina Tanase, Eindhoven (NL)
Rifat Ata Mustafa Hikmet, Eindhoven (NL)
Celine Catherine Sarah Nicole, Eindhoven (NL)
Esther Maria Van Echtelt, Eindhoven (NL)
Assignee SIGNIFY HOLDING B.V., Eindhoven (NL)

Claim of US Patent No. 10,448,579

1. A lighting device for providing horticulture light having a spectral light distribution with a light intensity within a first wavelength range of 400-475 nm and within a second wavelength range of 625-800 nm, the lighting device comprising:a plurality of light emitting diodes (LEDs) configured to generate LED light having a wavelength essentially within said range of 400-475 nm, wherein the plurality of light emitting diodes are configured in an array,
the lighting device further comprising at least two light generating parts:
a first light generating part consisting of a first subset of the plurality of light emitting diodes, wherein the first light generating part is configured to provide first light having a first spectral light distribution with a light intensity essentially within said first wavelength range, and
a plurality of second light generating parts wherein each second light generating part consists of a second subset of the plurality of light emitting diodes, wherein downstream of the optical path of each LED of the second subset of the plurality of light emitting diodes a light conversion element is configured, the light conversion element configured to convert at least part of the LED light generated by the second subset of the plurality of light emitting diodes into converted light having a wavelength that is essentially within the second wavelength range, wherein the second light generating part is configured to provide second light, consisting essentially of said converted light,
wherein the light conversion element is noncontiguous with any light emitting surface of each LED of the second subset, and
wherein the spectral light distributions, in the first wavelength range and the second wavelength range, of the first light and the second light are different,
the lighting device further comprising a control unit whereby the first subset of the plurality of light emitting diodes and the second subset of the plurality of light emitting diodes are independently controllable to thereby enable electronically controlling the intensity of the first light and the second light.