LED lamps with improved quality of light

• US 10,557,595 B2
• Filed: 11/28/2018
• Issued: 02/11/2020
• Est. Priority Date: 09/18/2009
• Status: Active Grant

• Current Assignee: Korrus Incorporated (MKD Electric, Inc.)
• Original Assignee: Soraa, Inc.
• Inventors: David, Aurelien J. F., Trottier, Troy A., Krames, Michael R.
• Primary Examiner(s): Vu, Jimmy T
• Application Number:
  US16/203,045
• Publication Number:
  US 20190195441A1
• Time in Patent Office: 440 Days
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• CPC Class Codes: F21K 9/62 using mixing chambers, e.g. housings with reflective walls
• 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: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 13/14 the elements being filters or photoluminescent elements, reflectors and refractors
• CPC Class Codes: F21V 23/02 the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
• CPC Class Codes: F21V 23/04 the elements being switches safety devices F21V25/00
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 7/04 Optical design
• CPC Class Codes: F21V 9/38 Combination of two or more photoluminescent elements of different materials
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• 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 27/153 in a repetitive configuration, e.g. LED bars
• 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 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H01L 33/32 : containing nitrogen
• CPC Class Codes: H01L 33/483 : Containers
• 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 33/505 : characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/60 : Reflective elements

Abstract

LED lamp systems having improved light quality are disclosed. The lamps emit more than 500 lm and more than 2% of the power in the spectral power distribution is emitted within a wavelength range from about 390 nm to about 430 nm.

Claims

1. An illumination system comprising:

at least one LED device configured to emit LED light having a peak emission wavelength within a range 405-430 nm, said at least one LED device having an external quantum efficiency greater than 45% measured at an ambient temperature of 25°

C. and at a current density of 40 A/cm2;

a wavelength conversion material optically coupled to said at least one LED device and configured to emit converted light; and

wherein said illumination system emits emitted light comprising a combination of said LED light and said converted light, said emitted light has a spectral power distribution (SPD) having a CCT and a CIE whiteness, and wherein said SPD has a first power from 380 nm to 800 nm and a second power from 390 nm to about 430 nm, wherein said second power is a sufficient portion of said first power such that said CIE whiteness is at least equal to a reference CIE whiteness of a blackbody radiator having the same CCT.

2. The illumination system of claim 1, wherein said second power is at least at least 4% of said first power.

3. The illumination system of claim 1, wherein said second power is less than 25% of said first power.

4. The illumination system of claim 1, wherein said emitted light has a chromaticity on or below the Planckian Locus.

5. The illumination system of claim 1, wherein said CCT is between 3300 K and 5300 K.

6. The lighting system of claim 1, wherein said emitted light has a color rendering index (CRI) greater than 80.

7. The illumination system of claim 2, wherein SPD has a cyanosis observation index (COI) below 3.3.

8. A lighting fixture comprising the lighting system of claim 1.

9. A method of using the lighting fixture of claim 8 in a medical setting.

10. An illumination system comprising:

at least one LED device configured to emit LED light having a peak emission wavelength within a range 405-430 nm;

a wavelength conversion material optically coupled to said at least one LED device and configured to emit converted light; and

wherein said illumination system emits emitted light comprising a combination of said LED light and said converted light, said emitted light has a spectral power distribution (SPD) having a peak between 390 nm and 430 nm and a valley between 470 nm and 490 nm, wherein said valley has a low point of essentially zero, wherein said SPD has a first power from 380 nm to 800 nm and a second power from 390 nm to about 430 nm, wherein said second power is at least 4% of said first power.

11. The illumination system of claim 10, wherein said second power is less than 25% of said first power.

12. The illumination system of claim 10, wherein said valley has a width of at least 20 nm.

13. The illumination system of claim 12, wherein said valley has a band between 480 and 490 with an intensity of about 0.

14. The illumination system of claim 10, wherein said emitted light has a chromaticity on or below the Planckian Locus.

15. The illumination system of claim 10, wherein said emitted light has an R9 above 50.

16. A lighting fixture comprising the lighting system of claim 10.

17. A method of using the lighting fixture of claim 16 in a medical setting.