Lighting device capable of providing horticulture light and method of illuminating horticulture
First Claim
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, anda 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, andwherein 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.
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Abstract
The invention provides a lighting device (100) with light emitting diodes (10) configured to generate light (11) having a wavelength selected from the range of 400-475 nm, wherein the lighting device (100) comprises at least two light emitting parts (100a, 100b). The first light emitting part (100a) comprises a first subset (10a) of light emitting diodes (10), and is configured to provide a first light (111a) having the first spectral light distribution substantially in the range of 400-475 nm. The second light emitting part (100b) comprises a second subset (10b) of light emitting diodes (10) and comprising a light conversion element (20) configured to convert at least part of the light (11) generated from the second subset (10b) of the plurality of light emitting diodes (10) into the second light (111b), with the second spectral light distribution substantially in the range of 625-800 nm. The first subset (10a) of the plurality of light emitting diodes (10) and the second subset (10b) of the plurality of light emitting diodes (10) are independently controllable.
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Citations
15 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A lighting device for providing horticulture light having a spectral light distribution with a light intensity at a first wavelength within a range of 400-475 nm and at a second wavelength within a range of 625-800 nm, the lighting device comprising:
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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 second light generating part consisting 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, consistently 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 plurality of light chambers, each of said chambers comprising walls and a top surface, thereby forming a cavity, and each of said light chambers containing less than two of the light emitting diodes, wherein the light emitting diodes of the second subset of the plurality of light emitting diodes are each arranged in one of a subset of the light chambers, wherein each light chamber of that subset comprises the light conversion element being positioned on the top surface of the light chamber, and wherein 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.
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14. A method of illuminating crop comprising:
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positioning a lighting device at a distance 10-50 cm from the crop, and illuminating at least part of the crop with horticulture light from the lighting device; wherein the lighting device is configured to provide horticulture light having a spectral light distribution with a light intensity at a first wavelength range of 400-475 nm and at 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, wherein the lighting device comprises at least two light generating parts, wherein 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 at least light intensity essentially within said first wavelength range, and a second light generating part consisting 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 essentially within the second wavelength range, wherein the second light generating part is configured to provide second light, comprising at least part of said converted light, wherein the light conversion element is noncontiguous with any light emitting surface of each LED of the second subset, 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, and wherein 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. - View Dependent Claims (15)
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Specification