The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 2018
Filed:
May. 01, 2015
Applicant:
Cree, Inc., Durham, NC (US);
Inventors:
Yuequan Hu, Morrisville, NC (US);
Eric Low, North Point, HK;
Assignee:
Cree, Inc., Durham, NC (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B 37/00 (2006.01); H05B 39/00 (2006.01); H05B 41/00 (2006.01); H05B 33/08 (2006.01); G09G 3/34 (2006.01);
U.S. Cl.
CPC ...
H05B 33/0854 (2013.01); H05B 33/0815 (2013.01); H05B 33/0818 (2013.01); G09G 3/3406 (2013.01); H05B 33/0809 (2013.01); H05B 33/0824 (2013.01); H05B 33/0842 (2013.01); H05B 33/0845 (2013.01); H05B 33/0851 (2013.01); Y02B 20/345 (2013.01); Y02B 20/346 (2013.01); Y02B 20/347 (2013.01); Y02B 20/42 (2013.01);
Abstract
A lighting fixture includes a solid-state lighting source, such as an LED light source. A control module of the lighting fixture uses temperature sensing circuitry to determine a relative ambient temperature. When the ambient temperature is above a defined ambient temperature threshold, a drive signal is provided to the solid-state light source at a target drive level that corresponds to a normal light output level. When the ambient temperature is below the ambient temperature threshold, the drive signal is provided to the solid-state light source at a reduced drive level, which is lower than the target drive level.