METHOD OF MAKING HIGH COLOR RENDERING (CRI) LED LIGHTS AND HIGH COLOR RENDERING INDEX LED LIGHTS

• US 20120176787A1
• Filed: 01/10/2012
• Published: 07/12/2012
• Est. Priority Date: 01/10/2011
• Status: Abandoned Application

• Current Assignee: William Yu
• Original Assignee: William Yu
• Inventors: Yu, William
• Application Number:
  US13/347,421
• Publication Number:
  US 20120176787A1
• Time in Patent Office: Days
• US Class Current: 362/231
• 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: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/24 using electrical feedback from LEDs or from LED modules
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

A high color rendering index light and method of forming the same wherein the light is formed from at least two light emitting diodes each having color temperatures which are close enough to one another to be visually the same and which are connected in series and wherein each of which has a different color rendering index and wherein at least one of the at least two light emitting diodes has a high Color Rendering Index Value of at least Ra 80.

Claims

1. A method of forming a high color rendering index light emitting diode light consisting of at least two light emitting diodes, the method comprising the steps of:

A. Selecting at least two light emitting diodes having color temperatures which are close enough to one another to be visually the same and wherein each of which has a different color rendering index and lumen efficacy, and wherein at least one of the at least two light emitting diodes has a high Color Rendering Index Value of at least Ra 80, and at least one of the at least two types of LEDs has a high lumen efficacy, and

B. Connecting the at least two light emitting diodes in electrical series.

2. The method of claim 1 wherein the two light emitting diodes are selected having color temperatures between 2700K and 3000K and wherein the two light emitting diodes are within 50K of one another.

3. The method of claim 1 wherein the two light emitting diodes are selected having color temperatures between 3000K to 4000K and wherein the two light emitting diodes are within 60K of one another.

4. The method of claim 1 wherein the two light emitting diodes are selected having color temperatures between 4000K to 5000K and wherein the two light emitting diodes are within 75K of one another.

5. The method of claim 1 wherein the two light emitting diodes are selected having color temperatures between 5000K to 6500K and wherein the two light emitting diodes are within 100K of one another.

6. The method of claim 1 wherein the two light emitting diodes are selected having color temperatures between 6500K to 9000K and wherein the two light emitting diodes are within 150K of one another.

7. The method of claim 1 wherein the two light emitting diodes are blue LED chips and coating the blue LED chips with at least a yellow phosphor.

8. The method of claim 7 including coating the LED chips with a combination of yellow, green and red phosphors.

9. The method of claim 1 wherein the two light emitting diodes are each a combination of red and blue LED chips in a common same LED package and coating the LED packages with at least a yellow phosphor.

10. The method of claim 9 including coating the LED packages with a combination of yellow and green phosphors.

11. A high color rendering index light comprising;

at least two light emitting diodes each having color temperatures which are close enough to one another to be visually the same and wherein each of which has a different color rendering index and lumen efficacy, and wherein at least one of the at least two light emitting diodes has a high Color Rendering Index Value of at least Ra 80, and at least one of the at least two types of LEDs has a high lumen efficacy, and the at least two light emitting diodes being connected in electrical series to one another.

12. The high color rendering index light of claim 11 wherein the two light emitting diodes are selected having color temperatures between 2700K and 3000K and wherein the two light emitting diodes are within 50K of one another.

13. The high color rendering index light of claim 11 wherein the two light emitting diodes are selected having color temperatures between 3000K to 4000K and wherein the two light emitting diodes are within 60K of one another.

14. The high color rendering index light of claim 11 wherein the two light emitting diodes are selected having color temperatures between 4000K to 5000K and wherein the two light emitting diodes are within 75K of one another.

15. The high color rendering index light of claim 11 wherein the two light emitting diodes are selected having color temperatures between 5000K to 6500K and wherein the two light emitting diodes are within 100K of one another.

16. The high color rendering index light of claim 11 wherein the two light emitting diodes are selected having color temperatures between 6500K to 9000K and wherein the two light emitting diodes are within 150K of one another.

17. The high color rendering index light of claim 11 wherein the two light emitting diodes are blue LED chips coated with at least a yellow phosphor.

18. The high color rendering index light of claim 17 wherein the LED chips are coated with a combination of yellow, green and red phosphors.

19. The high color rendering index light of claim 11 wherein the two light emitting diodes are each a combination of red and blue LED chips in a common same LED package, and wherein each package is coated with at least a yellow phosphor.

20. The high color rendering index light of claim 19 wherein each of the LED packages are coated with a combination of yellow and green phosphors.