High efficiency LED lamp

• US 9,328,876 B2
• Filed: 03/19/2014
• Issued: 05/03/2016
• Est. Priority Date: 03/19/2014
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Wilcox, Kurt, Keller, Bernd, Ibbetson, James, Ekbote, Ashish, Gupta, Nalini
• Primary Examiner(s): Bowman, Mary Ellen
• Application Number:
  US14/219,627
• Publication Number:
  US 20150267879A1
• Time in Patent Office: 776 Days
• US Class Current: 1/1
• CPC Class Codes: F21K 9/27 Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• 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 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2113/17 forming a single encapsulated light source
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A LED lamp includes a plurality of red LEDs and a plurality of blue LEDs, a phosphor covering at least the plurality of blue LEDs, where the lamp has an LPW of at least 200 in a steady state operation.

Claims

1. A LED lamp comprising:

a plurality of red LEDs and a plurality of blue LEDs, a phosphor covering at least the plurality of blue LEDs, where the lamp has a lumens per watt of at least 200 in a steady state operation.

2. The lamp of claim 1 where the plurality of blue LEDs and the plurality of red LEDs are operated from a single driver.

3. The lamp of claim 1 wherein the plurality of blue LEDs and the plurality of red LEDs are mounted in a plurality of LED components, each of the LED components comprising at least one blue LED and at least one red LED.

4. The lamp of claim 3 wherein the plurality of LED components extend in a linear path.

5. The lamp of claim 3 wherein the at least one blue LED and the at least one red LED are mounted on a substrate.

6. The lamp of claim 5 wherein the substrate has a surface that is exposed to the light generated by the at least one blue LED and the at least one red LED, the exposed surface of the substrate being covered in a reflective material.

7. The lamp of claim 6 wherein the reflective material comprises white reflective paint.

8. The lamp of claim 5 wherein the substrate comprises a printed circuit board.

9. The lamp of claim 3 wherein the LED component comprises two blue LEDs and two red LEDs.

10. The lamp of claim 3 wherein the plurality of LED components are mounted on a printed circuit board.

11. The lamp of claim 3 wherein each of the plurality of LED components are covered in a phosphor globe.

12. The lamp of claim 11 wherein the phosphor globe comprises a narrow green Barium Orthosilicate phosphor.

13. The lamp of claim 11 wherein the globe comprises a quartz globe.

14. The lamp of claim 11 wherein the globe is substantially spherically shaped.

15. The lamp of claim 3 further comprising a light diffusing lens covering the LED components.

16. The lamp of claim 1 wherein the blue LEDs comprise LEDs that produce approximately 745000 μ

W at 350 mA with a dominant wavelength between approximately 448 and 453 nm.

17. The lamp of claim 1 wherein the red LEDs comprise LEDs that produce approximately 167 lumens per watt at 30 mA with a dominant wavelength between 608 and 614 nm.

18. The lamp of claim 1 wherein the plurality of blue LEDs and the plurality of red LEDs are connected in a single string.

19. The lamp of claim 1 wherein the phosphor is provided on a dome where all of the plurality of blue LEDs are under the dome.

20. The lamp of claim 1 wherein white light is generated having a CRI of approximately 80.

21. The lamp of claim 1 wherein the luminous flux generated by the lamp is at least 3000.

22. The lamp of claim 1 wherein the lamp has a Duv of 0.002095.

23. The lamp of claim 1 wherein the lamp has a S/P ratio of 1.25.

24. The lamp of claim 1 wherein the lamp has a correlated color temperature (CCT) of approximately 3079.

25. The lamp of claim 1 wherein the lamp has a color rendering index (CRI) of at least 79.

26. The lamp of claim 1 wherein the lamp has a dominant wavelength of 581 nm with a peak wavelength at 616 nm.

27. The lamp of claim 3 wherein the LED components comprise four red LEDs and two blue LEDs.

28. The lamp of claim 14 wherein the red LEDs are positioned outside of the phosphor globes.

29. A LED lamp comprising:

a plurality of red LEDs and a plurality of blue LEDs, a phosphor covering at least the plurality of blue LEDs, where the lamp has a lumens per watt of at least 200 in a steady state operation, a color temperature range of about 3000 k, and within 10 MacAdam ellipses of the Black Body locus.