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:
Jan. 27, 2004
Filed:
Apr. 08, 2002
David W. Cunningham, Los Angeles, CA (US);
Other;
Abstract
An improved lighting apparatus, suitable for use as part of a lighting fixture, is disclosed, having a plurality of groups of distinct light-emitting devices, e.g., light-emitting diodes, that can be controlled to produce a beam of light having a wide variety of complex luminous flux spectra, including, but not limited, to spectra that closely emulate that of any one of a number of conventional light sources, with or without a conventional chemical dye filter. Each group of light-emitting devices is configured to emit light having a distinct luminous flux spectrum. A controller supplies selected amounts of electrical power to two or more groups of the plurality of groups of light-emitting devices, such that the groups cooperate to produce a composite beam of light having a selected luminous flux spectrum. The spectrum can be controlled to have a normalized mean deviation across the visible spectrum, relative to that of a beam of light to be emulated, of less than about 30%. This a marked improvement over all known lighting fixtures of the kind including multiple groups of distinct light sources. The groups of light-emitting devices are configured to include independently selected quantities of devices. Further, the groups of light-emitting devices are configured to each have a spectral half-width of less than about 40 nanometers (nm) and to have a peak flux wavelength that is spaced less than about 50 nm from that of an adjacent group.