Lighting assembly

• US 9,516,818 B2
• Filed: 09/16/2010
• Issued: 12/13/2016
• Est. Priority Date: 09/18/2009
• Status: Active Grant

• Current Assignee: Valoya Oy
• Original Assignee: Valoya Oy
• Inventors: Aikala, Lars
• Primary Examiner(s): COUGHLIN, ANDREW J
• Application Number:
  US13/390,370
• Publication Number:
  US 20120159845A1
• Time in Patent Office: 2,280 Days
• US Class Current: 1/1
• CPC Class Codes: A01G 7/045 with electric lighting
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
• CPC Class Codes: H05B 45/30 Driver circuits
• CPC Class Codes: Y02P 60/14 Measures for saving energy, e.g. in green houses

Abstract

A lighting fixture for facilitating plant growth and a light emitting component. The fixture includes a single light emission source LED device which provides at least two emission peaks in the wavelength range of 300-800 nm and at least one of the emission peaks has Full Width of Half Maximum (FWHM) at least 50 nm or higher. The emission peaks of the LED match well with a plant photosynthesis response spectrum and is therefore particularly suitable for high efficiency artificial lighting.

Claims

1. A horticultural light, comprising:

at least two Light Emitting Diodes (LEDs) emitting light including far red light in a wavelength range from 700 nm-800 nm and reducing green light below the light intensity in each of the bands adjacent to the green light, the emitted light including spectral emission peaks matching carotenoid and chlorophyll absorption peaks, the at least two LEDs having first spectral characteristics with maximum 50 nm full width of half maximum and a peak wavelength in a range of 400 to 500 nm; and

at least one adjustable dial configured to adjust at least one peak wavelength of the first spectral characteristics.

2. The light of claim 1, wherein at least a part or the whole of an emission at wavelengths of 500-600 nm is minimized and/or omitted and/or to be reduced below an intensity in a 400-500 nm band and below the intensity in a 600-700 nm band.

3. The light of claim 1, wherein the at least two LEDs have spectral characteristics with a freely adjustable peak in a wavelength range from 500 to 800 nm and that exhibit at least 30 nm full width of half maximum.

4. The light of claim 3, further comprising at least one electronic control system to switch first and the second LEDs independently on and off or alternatively dim independently by 0-100% power.

5. The light of claim 1, wherein emission intensities of spectral characteristics of the LEDs are adjustable.

6. The light of claim 1, wherein the at least two LEDs are of a first type and a second type, a ratio of LEDs of the first type to LEDs of the second type being 1 to 100.

7. The light of claim 1, wherein a photosynthetic photon flux (PPF) value of the light per Watt is 0.35 or higher.

8. The light of claim 1, wherein an emission decay rate difference of first and second spectral characteristics amounts to less than 20% during a first 10,000 hours usage, or during a first 25,000 hours usage.

9. The light of claim 1, wherein spectral emission characteristics, intensity, peak wavelength and full width of half maximum are controlled with selection and concentration of phosphor material.

10. The light of claim 1, wherein spectral emission characteristics, intensity, peak wavelength and full width of half maximum are controlled with blue emission characteristics of a LED chip.

11. The light of claim 1, wherein the at least two LEDs include a first LED that has phosphorescent spectral characteristics of a freely adjustable peak wavelength in the range of 500 nm to 800 nm range that exhibit at least 30 nm full width of half maximum, and first emission intensities of spectral characteristics adjustable in any ratio.

12. The light of claim 11, wherein the at least two LEDs include a second LED with one or more luminescent spectral characteristics with maximum 50 nm full width of half maximum and peak wavelength in the range of 400 to 500 nm, and optional phosphorescent spectral characteristics having freely adjustable peak wavelengths in the range of 450 nm to 800 nm.

13. The light of claim 1, wherein an up-conversion of LED emission is established by one or more of at least one semiconductor quantum dot, phosphor material, and sulfide material.

15. A method for enhancing plant growth, comprising:

the at least one light of claim 1 emitting light to at least one plant.

16. The light of claim 1, wherein the at least two LEDs have second and third spectral characteristics having freely adjustable peak wavelengths in a range from 450 nm to 800 nm.

14. A light for facilitating plant growth, comprising:

at least two luminescent UV light emitting diodes (LEDs), with external emission characteristics, the luminescent UV LEDs emitting light including far red light in a wavelength range from 700 nm-800 nm and reducing green light below the light intensity in each of the bands adjacent to the green light, the emitted light including spectral emission peaks matching carotenoid and chlorophyll absorption peaks; and

at least one adjustable dial configured to adjust phosphorescent emission intensities of the emitted light from the at least two LEDs in any ratio to accommodate plant growth,

wherein the at least two LEDs have spectral characteristics with maximum 50 nm full width of half maximum and a peak wavelength in a range of 400 to 500 nm.

17. A horticultural light, comprising:

at least two Light Emitting Diodes (LEDs) emitting light including far red light in a wavelength range from 700 nm-800 nm and reducing green light below the light intensity in each of the bands adjacent to the green light, the emitted light including spectral emission peaks matching carotenoid and chlorophyll absorption peaks, whcrcin the at least two LEDs having spectral characteristics with maximum 50 nm full width of half maximum and a peak wavelength in a range of 400 to 500 nm; and

at least one adjustable dial configured to adjust at least one peak wavelength of the spectral characteristics,

wherein a wavelength up-conversion of radiation power of the LEDs is formed by at least two phosphor materials.