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Title:
APPARATUS, METHOD TO CHANGE LIGHT SOURCE COLOR TEMPERATURE WITH REDUCED OPTICAL FILTERING LOSSES
Document Type and Number:
WIPO Patent Application WO/2011/088363
Kind Code:
A3
Abstract:
The efficiency and color temperature of a lighting device may be improved by using wavelength shifting material, such as a phosphor, to absorb less desired wavelengths and transmit more desired wavelengths. A reflective filter (e.g., dichroic or dielectric mirror material) may pass desired wavelengths while returning or reflecting less desired wavelengths away from an optical exit back toward wavelength shifting material which may either be disposed in the optical path or on the periphery of the light source.

Inventors:
REED WILLIAM G (US)
RENN JOHN O (US)
Application Number:
PCT/US2011/021359
Publication Date:
December 22, 2011
Filing Date:
January 14, 2011
Export Citation:
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Assignee:
EXPRESS IMAGING SYSTEMS LLC (US)
REED WILLIAM G (US)
RENN JOHN O (US)
International Classes:
F21V13/02; F21V9/00; F21Y101/02
Domestic Patent References:
WO2004068182A22004-08-12
Foreign References:
JP2009071254A2009-04-02
JP2009105379A2009-05-14
Other References:
See also references of EP 2524165A4
Attorney, Agent or Firm:
ABRAMONTE, Frank et al. (Suite 5400701 Fifth Avenu, Seattle Washington, US)
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