US Patent No. 9,089,032

SYSTEM AND METHOD FOR COLOR TUNING LIGHT OUTPUT FROM AN LED-BASED LAMP


Patent No. 9,089,032
Issue Date July 21, 2015
Title System And Method For Color Tuning Light Output From An Led-based Lamp
Inventorship David Bowers, San Jose, CA (US)
Thomas Poliquin, Aptos, CA (US)
Dustin Cochran, Boulder Creek, CA (US)
Assignee LUMENETIX, INC., Scotts Valley, CA (US)

Claim of US Patent No. 9,089,032

1. A method of performing a search in a one-dimensional search space within chromaticity space quantifying illumination, the
method comprising:
providing a target illumination spectrum and an illumination search space;
configuring a predetermined distance threshold from the target illumination spectrum; and
narrowing the illumination search space to match the target illumination spectrum by:
selecting by a processor a plurality of points in the illumination search space, wherein the plurality of points correspond
to operating levels of light emitting diodes (LEDs) in an LED-based lamp;

determining by the processor a preferred point from the plurality of selected points, wherein the preferred point corresponds
to a light generated by the LED-based lamp that has a lamp spectrum closest to the target illumination spectrum out of the
plurality of points;

discarding by the processor a portion of the illumination search space that does not include the preferred point, wherein
the discarded portion of the illumination search space is at least a buffer zone away from the preferred point; and

iterating by the processor the narrowing of the illumination search space in a remaining narrowed search space until one of
the selected points provides a final lamp spectrum within the predetermined distance threshold of the target illumination
spectrum.