Lamp color matching and control systems and methods

• US 8,796,948 B2
• Filed: 05/18/2010
• Issued: 08/05/2014
• Est. Priority Date: 11/10/2009
• Status: Expired due to Fees

• Current Assignee: Lumenetix, Inc. (ERP Power, LLC)
• Original Assignee: Lumenetix, Inc. (ERP Power, LLC)
• Inventors: Weaver, Matthew, Gsoedl, Juergen
• Primary Examiner(s): VU, JIMMY T
• Application Number:
  US12/782,038
• Publication Number:
  US 20110109445A1
• Time in Patent Office: 1,540 Days
• Field of Search: 315/152, 315/158, 315/185.R, 315/291, 315/294, 315/307, 315/308, 315/312
• US Class Current: 315/294
• 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 45/28 using temperature feedback
• CPC Class Codes: H05B 47/19 via wireless transmission

Abstract

Lamp color matching and control systems and methods are described. One embodiment includes a lighting node and a controller. The lighting node can include a plurality of light emitting diodes configured for illumination and further configured for optical communication with the controller, a communicator configured for radio communication with the controller, a memory configured to store a node identifier, a control logic, and a temperature sensor. The controller can include an optical sensor configured to sense the correlated color temperature and brightness of the lighting node and further configured for optical communication with the lighting node, and a communicator configured for radio communication with the lighting node. The controller can calibrate the lighting node as well as perform light copy and paste, light following, and light harvesting operations with the lighting node.

Claims

1. A method for color matching an output of a lighting node comprising a plurality of lamps, the method comprising:

receiving at the lighting node a correlated color temperature setting;

determining at the lighting node a temperature of the lighting node-utilizing a temperature sensor of the lighting node;

determining in the lighting node a luminous flux of a plurality of lamps of the lighting node required to output the received correlated color temperature from the lighting node based on a color mixing plan;

determining in the lighting node a current required by each of the plurality of lamps based on the luminous flux, the temperature, and a function for the current used to generate a given luminous flux over a range of luminous flux values and temperatures for each of the plurality of lamps, wherein the function for the current is modeled individually for each of the plurality of lamps; and

operating the plurality of lamps with the determined current.

2. The method of claim 1, further including receiving a brightness setting, wherein determining the luminous flux is further based on the received brightness setting.

3. The method of claim 1, further including determining in the lighting node duty cycle control required to deliver the required current to each of the plurality of lamps, and the plurality of lamps are operated with the required current and duty cycle control.

4. The method of claim 1, further comprising re-determining the current required by each of the plurality of lamps when the measured temperature changes.

5. The method of claim 1, wherein measuring a temperature of the lighting node comprises measuring a temperature of the lighting node at each of the plurality of lamps.

6. The method of claim 1, further comprising reducing the determined luminous flux of the plurality of lamps to prevent the temperature of the lighting node from exceeding a maximum operating temperature.

7. The method of claim 1, wherein the color mixing plan includes a look-up table of points on curves of luminous flux as a function of correlated color temperature.

8. The method of claim 1, wherein the color mixing plan includes a functional approximation set of coefficients.

9. The method of claim 1, wherein the plurality of lamps each include one or more light emitting diodes (LEDs).

10. A lighting node comprising:

a plurality of lamps;

a temperature sensor;

a memory;

a logic, wherein the logic is configured to;

determine a temperature at the lighting node utilizing the temperature sensor;

determine a luminous flux of the plurality of lamps required to output a correlated color temperature from the lighting node based on a color mixing plan stored in the memory;

determine a current required by each of the plurality of lamps based on the luminous flux, the determined temperature, and a generated model for each of the plurality of lamps, wherein the generated model includes a function for the current used to generate a luminous flux over a range of luminous flux values and temperatures; and

activate the plurality of lamps at the determined current.

11. The lighting node of claim 10, wherein the logic is further configured to determine duty cycles required to deliver the required current to each of the plurality of lamps, and the plurality of lamps are operated at the determined duty cycles.

12. The lighting node of claim 10, wherein the logic is further configured to throttle the luminous flux of the plurality of lamps if the temperature of the plurality of lamps equals or exceeds a maximum operating temperature.

13. The lighting node of claim 10, wherein the logic is further configured to determine a luminous flux of the plurality of lamps to output the correlated color temperature based on a received brightness target for the lighting node.

14. The lighting node of claim 10, wherein the temperature sensor senses a temperature of two or more of the plurality of lamps.

15. The lighting node of claim 10, further comprising a receiver configured to receive the correlated color temperature.

16. The lighting node of claim 15, wherein the receiver receives the correlated color temperature wirelessly.

17. The lighting node of claim 15, wherein the receiver is a wireline device.

18. The lighting node of claim 10, wherein each of the plurality of lamps includes one or more light emitting diodes (LED), and wherein the memory further stores the generated models for each LED in the plurality of lamps.