Methods and apparatus for generating and modulating white light illumination conditions

• US 7,959,320 B2
• Filed: 01/22/2007
• Issued: 06/14/2011
• Est. Priority Date: 11/18/1999
• Status: Expired due to Fees

• Current Assignee: Signify North America Corporation (Signify N.V.)
• Original Assignee: Philips Solid-State Lighting Solutions (Koninklijke Philips N.V.)
• Inventors: Cella, Charles H., Mueller, George G., Dowling, Kevin J., Morgan, Frederick M., Ducharme, Alfred D., Lys, Ihor A.
• Primary Examiner(s): Lee; Jong-Suk (James)
• Assistant Examiner(s): Neils; Peggy A.
• Application Number:
  US11/625,608
• Publication Number:
  US 20070115658A1
• Time in Patent Office: 1,604 Days
• Field of Search: 362/612, 362/613, 362/555, 362/800, 362/276, 362/802, 362/234, 362/231, 313/486, 313/489, 313/485, 313/483
• US Class Current: 362/231
• CPC Class Codes: A45D 42/10 illuminated
• CPC Class Codes: A45D 44/02 Furniture or other equipment specially adapted for hairdressers' rooms and not covered elsewhere hairdressers' chairs A47C1/04
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/22 using optical feedback
• CPC Class Codes: H05B 45/325 Pulse-width modulation [PWM]
• CPC Class Codes: H05B 45/3577 Emulating the dimming characteristics, brightness or colour temperature of incandescent lamps
• CPC Class Codes: H05B 45/3578 Emulating the electrical or functional characteristics of discharge lamps
• CPC Class Codes: H05B 45/38 using boost topology
• CPC Class Codes: H05B 47/155 Coordinated control of two or more light sources
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

Methods and apparatus for generating and modulating white light illumination conditions. Examples of applications in which such methods and apparatus may be implemented include retail environments (e.g., food, clothing, jewelry, paint, furniture, fabrics, etc.) or service environments (e.g., cosmetics, hair and beauty salons and spas, photography, etc.) where visible aspects of the products/services being offered are significant in attracting sales of the products/services. Other applications include theatre and cinema, medical and dental implementations, as well as vehicle-based (automotive) implementations. In another example, a personal grooming apparatus includes one or more light sources disposed in proximity to a mirror and configured to generate variable color light, including essentially white light, whose color temperature may be controlled by a user.

Claims

1. A method of providing illumination in a marketplace, comprising:

a) illuminating at least one article in the marketplace with essentially white light from a plurality of LEDs, the marketplace comprising a consumer environment configured for the sale or purchase of goods and services, the plurality of LEDs comprising a first white LED providing a first output having a first spectrum and a first color temperature, the first white LED including a first phosphor, the first white LED generating a first wavelength that is converted by the first phosphor to provide the first spectrum, and a second LED providing a second output having a second spectrum and a second color temperature, the first spectrum being different than the second spectrum; and

b) independently controlling at least one of the first white LED and the second LED so as to vary a third color temperature and a spectral content of the essentially white light.

2. The method of claim 1, wherein the step b) comprises a step of independently controlling at least one of the first output and the second output in response to execution of a program.

3. The method of claim 1, wherein the step b) comprises a step of independently controlling at least one of the first output and the second output in response to at least one sensed condition.

5. The method of claim 1, wherein the step b) comprises independently controlling one of a UV component and an IR component of the essentially white light.

6. The method of claim 1, wherein the step b) comprises a step of controlling at least one of the first output and the second output so as to simulate at least one indoor lighting condition.

7. The method of claim 1, wherein the step b) comprises a step of controlling at least one of the first output and the second output so as to simulate at least one outdoor lighting condition.

8. The method of claim 1, wherein the at least one article comprises at least one of a food item, an article of jewelry, an article of clothing, an article of furniture, a vehicle, a cosmetic item, an item associated with home decor, an article of furniture, a personal body part, a photograph, and a piece of artwork.

9. The method of claim 1, wherein the marketplace comprises an environment configured for the provision of personal grooming or beauty-related goods or services.

4. A method of providing illumination in a marketplace, comprising:

a) illuminating at least one article in the marketplace with essentially white light from a plurality of LEDs, the marketplace comprising a consumer environment configured for the sale or purchase of goods and services, the plurality of LEDs comprising a first white LED providing a first output having a first spectrum and a first color temperature, the first white LED including a first phosphor, the first white LED generating a first wavelength that is converted by the first phosphor to provide the first spectrum, and a second LED providing a second output having a second spectrum and a second color temperature, the first spectrum being different than the second spectrum; and

b) independently controlling at least one of the first white LED and the second LED so as to vary a third color temperature and a spectral content of the essentially white light,

wherein the step b) comprises a step of independently controlling at least one of the first white LED and the second LED in response to at least one action of a person in the vicinity of the at least one article.

10. A method of providing illumination in a marketplace, comprising:

illuminating a first article in a first portion of the marketplace with first essentially white light produced by a first plurality of LEDs comprising at least one first white LED including a first phosphor, the first plurality of LEDs comprising a first LED having a first spectrum and a first color temperature and a second LED having a second spectrum and a second color temperature, the first spectrum being different than the second spectrum, wherein at least one of the first LED and the second LED includes the at least one first white LED generating a first wavelength that is converted by the first phosphor to provide one of the first spectrum and the second spectrum;

illuminating a second article in a second portion of the marketplace with second essentially white light produced by a second plurality of LEDs comprising at least one second white LED, the second plurality of LEDs comprising a third LED having a third spectrum and a fourth LED having a fourth spectrum, the third spectrum being different than the fourth spectrum, wherein at least one of the third LED and the fourth LED includes the at least one second white LED; and

controlling a light output of at least one of the first LED, the second LED, the third LED and the fourth LED such that at least one of the first color temperature and the second color temperature of the first light is controlled independently of a color temperature of the second light.

11. The method of claim 10, wherein the step of controlling a light output comprises adjusting the light output of at least one of the first LED, the second LED, the third LED and the fourth LED such that the first color temperature of the first light is different than the second color temperature of the second light.

12. The method of claim 10, wherein the marketplace comprises a consumer environment configured for the purchase of goods or services.

13. The method of claim 10, wherein the marketplace is configured for the provision of grooming or beauty-related goods or services.

14. The method of claim 10, wherein at least one of the first and second articles comprises at least one of a food item, an item of jewelry, an article of clothing, a cosmetic item, an item associated with home decor, an item of furniture, a vehicle, a personal body part, a photograph, and a piece of artwork.

15. The method of claim 10, wherein the first article is predominantly a first color and the second article is predominantly a second color, the first color being substantially different than the second color.

16. The method of claim 14, wherein the first article and the second article are a same type.

17. The method of claim 14, wherein the first article and the second article are different types.

18. The method of claim 10, wherein the step of controlling the light output comprises reducing at least one of an ultraviolet component and an infrared component in at least one of the first light and the second light.

19. The method of claim 10, wherein the step of controlling the light output comprises varying the first light and the second light in a coordinated manner.

20. The method of claim 10, wherein the first plurality of LEDs and the second plurality of LEDs form at least a portion of a networked lighting system, and wherein the step of controlling comprises controlling the light output of at least one of the first LED, the second LED, the third LED and the fourth LED based on at least one network control signal.

21. The method of claim 10, wherein the step of controlling comprises a step of controlling the light output of at least one of the first LED, the second LED, the third LED and the fourth LED in response to at least one sensed condition.

22. A method of providing illumination in a marketplace, comprising:

illuminating a first article in a first portion of the marketplace with first essentially white light produced by a first plurality of LEDs comprising at least one first white LED including a first phosphor, the first plurality of LEDs comprising a first LED having a first spectrum and a first color temperature and a second LED having a second spectrum and a second color temperature, the first spectrum being different than the second spectrum, wherein at least one of the first LED and the second LED includes the at least one first white LED generating a first wavelength that is converted by the first phosphor to provide one of the first spectrum and the second spectrum;

illuminating a second article in a second portion of the marketplace with second essentially white light produced by a second plurality of LEDs comprising at least one second white LED, the second plurality of LEDs comprising a third LED having a third spectrum and a fourth LED having a fourth spectrum, the third spectrum being different than the fourth spectrum, wherein at least one of the third LED and the fourth LED includes the at least one second white LED; and

controlling a light output of at least one of the first LED, the second LED, the third LED and the fourth LED such that at least one of the first color temperature and the second color temperature of the first light is controlled independently of a color temperature of the second light,

wherein the step of controlling comprises a step of controlling the light output of at least one of the first LED, the second LED, the third LED and the fourth LED in response to at least one action of a person associated with the marketplace.

23. A method of illumination, comprising:

A) illuminating a first room with first essentially white light;

B) measuring a first spectral content of the first essentially white light;

C) illuminating a second room with second essentially white light produced by a plurality of LEDs, a first white LED of the plurality of LEDs having a first spectrum and a first color temperature, the first white LED including a first phosphor, the first white LED generating a first wavelength that is converted by the first phosphor to provide the first spectrum, and a second LED of the plurality of LEDs having a second spectrum and a second color temperature, the first spectrum being different than the second spectrum; and

D) adjusting a light output of at least one of the first white LED and the second LED such that a second spectral content of the second light is substantially the same as the first spectral content of the first light.

24. The method of claim 23, wherein D) comprises adjusting the light output of at least one of the first white LED and the second LED such that a color temperature of the second light is substantially the same as a color temperature of the first light.

25. The method of claim 23, wherein A) comprises generating the first essentially white light using at least one LED-based light source that does not include the first white LED and the second LED.