Lighting assembly

• US 8,549,787 B2
• Filed: 06/09/2010
• Issued: 10/08/2013
• Est. Priority Date: 09/18/2009
• Status: Active Grant

• Current Assignee: Valoya Oy
• Original Assignee: Valoya Oy
• Inventors: Aikala, Lars
• Primary Examiner(s): Hayes, Kristen C
• Application Number:
  US12/797,215
• Publication Number:
  US 20100259190A1
• Time in Patent Office: 1,217 Days
• Field of Search: 47/581.LS, 47/10.1 R
• US Class Current: 47/58.1LS
• 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 comprises 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 lighting fixture comprising:

a first Light Emitting Diode having first, second, and third spectral characteristics including a peak in the wavelength range from 600 to 700 nm, a peak in the wavelength range from 440 to 500 nm, and a peak in the wavelength range from 500 to 600 nm respectively, the first spectral characteristics being arranged to exhibit a full width of half maximum of at least 50 nm or more, and the second spectral characteristics having a maximum of 50 nm full width of half maximum; and

an up-conversion unit including a material configured to provide that all or part of an emission at a frequency of 600-800 nm is generated using a whole or partial wavelength up-conversion of radiation power of the first Light Emitting Diode, the up-conversion unit providing that all or part of an emission at wavelengths of 500-600 nm is arranged to be reduced below an intensity in a 400-500 nm band and below an intensity in a 600-700 nm band.

2. The lighting fixture of claim 1, wherein the first Light Emitting Diode has additional spectral characteristics with a freely adjustable peak in the wavelength range from 500 to 800 nm and arranged to exhibit at least 30 nm full width of half maximum.

3. The lighting fixture of claim 1, wherein emission intensities of the first, second and third spectral characteristics of the first Light Emitting Diode are arranged to be adjustable.

4. The lighting fixture of claim 1, further comprising a second Light Emitting Diode with at least one of first spectral characteristics with a maximum of 50 nm full width of half maximum and a peak wavelength in the range of 400 to 500 nm and optionally second and third spectral characteristics arranged to have a freely adjustable peak wavelengths in the range from 450 nm to 800 nm.

5. The lighting fixture of claim 1, further comprising a second Light Emitting Diode with at least one phosphorescent spectral characteristics with a maximum of 50 nm full width of half maximum and a peak wavelength in the range of 400 to 500 nm, and phosphorescent second and third spectral characteristics having freely adjustable peak wavelengths in the range of 450 nm to 800 nm by said up-conversion unit.

6. A method of providing light for at least one plant, utilizing the horticultural lighting fixture of claim 1.

7. A method of enhancing plant growth by emitting light from the horticultural lighting fixture of claim 1 onto at least one plant.