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

• US 20150128488A1
• Filed: 07/08/2013
• Published: 05/14/2015
• Est. Priority Date: 07/11/2012
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Tanase, Cristina, Hikmet, Rifat Ata Mustafa, Nicole, Celine Catherine Sarah, Casper, Lars Christian, Van Echtelt, Esther Maria
• Granted Patent: US 10,448,579 B2
• Time in Patent Office: Days
• US Class Current: 47/58.1LS
• CPC Class Codes: A01G 7/045 with electric lighting
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21V 9/32 characterised by the arrangement of the photoluminescent material
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y02P 60/14 Measures for saving energy, e.g. in green houses

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.

Claims

1. A lighting device capable of providing horticulture light having a spectral light distribution with at least light intensity at a first wavelength selected from the range of 400-475 nm and at a second wavelength selected from the range of 625-800 nm, the lighting device comprising a plurality of light emitting diodes (LEDs) configured to generate LED light having a wavelength selected from 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 comprises 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 at said first wavelength,

a second light generating part comprises a second subset of the plurality of light emitting diodes wherein downstream 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 into converted light with the second wavelength, wherein the second light generating part is configured to provide second light, comprising at least part of said converted light, and the second light having a second spectral light distribution with at least light intensity at said second wavelength,

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;

the two or more subsets of the plurality of light emitting diodes are independently controllable.

2. The lighting device according to claim 1, wherein the light conversion element comprises an organic dye configured to convert at least part of the LED light into said converted light, with the second wavelength.

3. The lighting device according to claim 1, wherein the second light generating part is configured to provide second light, having a second spectral light distribution with at least light intensity at a red wavelength selected from the range of 625-675 nm and at a far red wavelength, larger than the red wavelength, selected from the range of 675-750 nm.

4. The lighting device according to claim 1, wherein the light conversion element is provided by a foil.

5. The lighting device according to claim 1, wherein downstream the optical path of each LED of the first subset of the plurality of light emitting diodes a light transmissive element is configured, the light transmissive element configured to transmit at least part of the LED light.

6. The lighting device according to claim 3,

wherein said first spectral light distribution is substantially in the range of 400-475 nm and said second spectral light distribution is substantially in the range of 625-800 nm.

7. The lighting device according to claim 1, wherein the first light generating part and the second light generating part have an elongated shape and are arranged parallel.

8. The lighting device according to claim 1, wherein the first subset comprises a plurality of light emitting diodes (10) and wherein the second subset comprises a plurality of light emitting diodes.

9. The lighting device according to claim 1, comprising a plurality of first light generating parts and a plurality of second light generating parts.

10. The lighting device according to claim 9, wherein first light generating parts and the second light generating parts are configured in a 2D array of alternating first light generating parts and second light generating parts.

11. The lighting device according to claim 9, wherein the plurality of first or second light generating parts are arranged with a pitch (p) between neighboring first respectively second light generating parts in the range of 5-30 cm.

12. The lighting device according to claim 9, comprising a third light generating part (100c), comprising a third subset (10c) of the plurality of light emitting diodes (100), the third light generating part (100c) configured to provide third light (111c) having a spectral light distribution which differs from the first spectral light distribution and the second spectral light distribution, wherein the three or more subsets (10a,10b, 10c) of the plurality of light emitting diodes (10) are independently controllable.

13. The lighting device according to claim 9, wherein the plurality of light emitting diodes are arranged in a plurality of light chambers.

14. A method of illuminating crop comprising illuminating at least part of the crop with horticulture light from the lighting device according to claim 1.

15. The method according to claim 14, comprising varying the spectral intensity distribution of the horticulture light as a function of one or more of (a) the addressed part of the crop, (b) the time of the day, (c) the light intensity and light distribution of other light than the horticulture light, (d) the type of crop, (e) the growth stage of the crop, (f) the stage of a fruit, (g) the time to harvest, (h) the time from harvest, and (i) position in horticulture arrangement.