Illumination apparatus for simulating dynamic light conditions

• US 6,554,439 B1
• Filed: 05/15/2000
• Issued: 04/29/2003
• Est. Priority Date: 05/15/2000
• Status: Expired due to Fees

• Current Assignee: Mclean Hospital (Mass General Brigham, Inc.)
• Original Assignee: Mclean Hospital (Mass General Brigham, Inc.)
• Inventors: Teicher, Martin H., Lowen, Steven B.
• Primary Examiner(s): HUSAR, STEPHEN F
• Application Number:
  US09/570,966
• Time in Patent Office: 1,079 Days
• Field of Search: 362/1, 362/21, 362/234, 362/231, 362/276, 362/293, 315/155, 315/360, 600/27, 607/88, 607/95
• US Class Current: 362/2
• CPC Class Codes: F21S 10/02 changing colors F21S10/002 - F21S10/007, F21S10/04 take precedence
• CPC Class Codes: F21S 8/006 Solar simulators, e.g. for testing photovoltaic panels
• CPC Class Codes: F21V 23/0442 activated by means of a sensor, e.g. motion or photodetectors
• CPC Class Codes: F21V 23/0457 the sensor sensing the operating status of the lighting device, e.g. to detect failure of a light source or to provide feedback to the device
• CPC Class Codes: F21V 9/40 with provision for controlling spectral properties, e.g. colour, or intensity
• CPC Class Codes: G01J 2003/1278 Mask with spectral selection

Abstract

An apparatus for generating artificial light that closely simulates the intensity and spectrum of natural light and other dynamic light conditions. The apparatus includes a collection of light sources of various colors which are controlled by a computer. Attached to the computer is a sensor that measures the spectral qualities of the light produced by the light sources. The sensor sends this information to the computer which then adjusts the light sources to generate the desired light conditions.

Claims

1. An apparatus for generating artificial light that mimics a desired dynamic light condition, comprising:

(a) multiple illumination sources emitting light of different wavelengths;

(b) means for detecting spectral characteristics of the sum of said emitted light and transmitting said characteristics to a computer; and

(c) means for sending control signals from said computer to said illumination sources to control the intensity of illumination from a plurality of said illumination sources to alter said spectral characteristics so that the light mimics the desired dynamic light condition over time.

2. The apparatus of claim 1, wherein said dynamic light condition is natural light.

3. The apparatus of claim 1, wherein said illumination sources comprise a white light source, a blue light source, a yellow light source, and a red light source.

4. The apparatus of claim 1, wherein said means for detecting spectral characteristics comprises a collection of photocells.

5. The apparatus of claim 1, wherein said computer is a stand-alone personal computer.

6. The apparatus of claim 1, wherein said apparatus further comprises an electronic driver capable of translating low-level control signals generated by standard computer peripherals into high-power signals for directly controlling said illumination sources.

7. The apparatus of claim 1, wherein said illumination sources further comprise at least one rotating filter.

8. The apparatus of claim 4, wherein said means for detecting spectral characteristics further comprises a collection of filters.

9. A method for delivering artificial light that mimics a dynamic light condition comprising the following steps:

(a) emitting light of different wavelengths from multiple illumination sources;

(b) detecting spectral characteristics of the sum of said emitted light and transmitting said characteristics to a computer;

(c) sending control signals from said computer to said illumination sources to control the intensity of illumination from a plurality of said illumination sources; and

(d) altering said spectral characteristics so that the light mimics the dynamic light condition over time.

10. The method of claim 9, wherein said dynamic light condition is natural light.

11. The method of claim 9, wherein said light is used to alter natural patterns of animal behavior.

12. The method of claim 9, wherein said light is used to facilitate seasonal behavior in animals.

13. The method of claim 12, wherein said seasonal behavior is mating.

14. The method of claim 9, wherein said light is used to inhibit seasonal behavior in animals.

15. The method of claim 9, wherein said light is used to modify seasonal behavior in animals.

16. The method of claim 9, wherein said light is used to treat a light-sensitive psychological disorder.

17. The method of claim 16, wherein said psychological disorder is selected from the group consisting of SAD, depression, sleep disorders, jet lag, chronobiologic disorders, and circadian rhythm disorders.

18. The method of claim 9, wherein said light is used to facilitate natural cycles of plant growth, flowering, or fruit production.

19. The method of claim 9, wherein said light is used to inhibit natural cycles of plant growth, flowering, or fruit production.

20. The method of claim 9, wherein said light is used to modify cycles of plant growth, flowering or fruit production.

21. A method for calibrating an illumination device comprising the following steps:

(a) applying a power level to an illumination source of said illumination device so that the illumination source emits light;

(b) allowing the level of emitted light to reach equilibrium;

(c) detecting intensity or spectral characteristics of said emitted light;

(d) storing said characteristics of said emitted light;

(e) increasing said power level and repeating steps (a) through (d); and

(f) repeating steps (a) through (e) for each illumination source of said illumination device.