Methods and apparatus for controlling a color temperature of lighting conditions Number:7,520,634 from the United States Patent and Trademark Office (PTO) owispatent

Title: Methods and apparatus for controlling a color temperature of lighting conditions

Abstract: Methods and apparatus in which at least one first LED generates first radiation having a first spectrum, and at least one second LED generates second radiation having a second spectrum different than the first spectrum. One or more controllers control at least one of the first radiation and the second radiation so as to control at least a color temperature of visible radiation. In one example, one or more sensors monitor at least one characteristic of sample radiation and provide one or more sensor signals to the one or more controllers, which in turn control at least the color temperature of the visible radiation based at least in part on the at least one sensor signal. In various implementations, the sample radiation may be ambient illumination (e.g., natural-light and/or light from other light sources), may be the visible radiation itself (e.g., to provide feedback to the one or more controllers), or generally any desired lighting condition to simulate.

Patent Number: 7,520,634 Issued on 04/21/2009 to Ducharme,   et al.

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Inventors:	Ducharme; Alfred D. (Orlando, FL), Morgan; Frederick M. (Quincy, MA), Lys; Ihor A. (Milton, MA), Dowling; Kevin J. (Westford, MA), Mueller; George G. (Boston, MA)
Assignee:	Philips Solid-State Lighting Solutions, Inc. (Burlington, MA)
Appl. No.:	11/322,891
Filed:	December 30, 2005

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Related U.S. Patent Documents

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	Application Number	Filing Date	Patent Number	Issue Date
	09716819	Nov., 2000	7014336
	09213581	Dec., 1998	7038398
	60166533	Nov., 1999
	60201140	May., 2000
	60235678	Sep., 2000
	60071281	Dec., 1997
	60068792	Dec., 1997
	60078861	Mar., 1998
	60079285	Mar., 1998
	60090920	Jun., 1998

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Current U.S. Class:	362/276 ; 362/231; 362/800
Current International Class:	F21V 23/04 (20060101)
Field of Search:	362/231,251,260,263,265,276,295,394,800

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