Industry Patents
Patent: 6683423
Lighting Apparatus for Producing a Beam of Light Having a Controlled Luminous Flux Spectrum
(Click image for PDF of full patent)
| Patent Number: |
6683423 |
| Title: |
Lighting Apparatus for Producing a Beam of Light Having a Controlled Luminous Flux Spectrum |
| 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.
|
| Country of Issue: |
US |
| First Named Inventor: |
Cunningham |
| Assignee: |
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| Continuation or Divisional of: |
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| International Classification: |
H05B 37/00 |
| US Classification: |
315/312 |
| Issue Date: |
01-27-2004 |
| Filing Date: |
04-08-2002 |
| Application : |
10/118828 |
| Notes: |
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| Link to Patent at freepatentsonline.com: |
6683423 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
6683423 at Google Patents |
1. The Google Patents and World Patent Family links will likely not work until a few weeks
after the patent has issued - they take a while to get new patents in their systems.
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