US 2003/0189412 A1 · LIGHTING FIXTURE FOR PRODUCING A BEAM OF LIGHT HAVING A CONTROLLED LUMINOUS FLUX SPECTRUM

Abstract

An improved 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.

Claims43

Dependent claims

A lighting fixture for producing a beam of light having a luminous flux spectrum emulating that of a beam of light produced by a predetermined light source having an incandescent lamp, such light source being free of a filter that modifies the luminous flux spectrum of the light emitted by the lamp, the lighting fixture comprising:

a plurality of groups of light-emitting devices, each such group configured to emit light having a distinct luminous flux spectrum;
and
a controller configurable to supply selected amounts of electrical power to the plurality of groups of light-emitting devices, such that the groups cooperate to produce a composite beam of light having a prescribed luminous flux spectrum that has a normalized mean deviation across the visible spectrum of less than about 30% relative to the luminous flux spectrum of a beam of light produced by the predetermined light source to be emulated.

A lighting fixture for producing a beam of colored light having a prescribed luminous flux spectrum, the lighting fixture comprising:

a plurality of groups of light-emitting devices, each such group configured to emit light having a distinct luminous flux spectrum;
and
a controller configurable to supply selected amounts of electrical power to the plurality of groups of light-emitting devices, such that the groups cooperate to produce a composite beam of light;
wherein the composite beam of light has a prescribed luminous flux spectrum having substantial energy only within a contiguous bandwidth of less than about 200 nanometers when the controller supplies prescribed maximum amounts of electrical power to all of the groups of light-emitting devices.

1 more element

A lighting fixture for producing a beam of light having a prescribed luminous flux spectrum, the lighting fixture comprising:

a plurality of groups of light-emitting devices, each such group configured to emit light having a distinct luminous flux spectrum, and at least two of the plurality of groups including different quantities of devices;
and
a controller configurable to supply selected amounts of electrical power to the plurality of groups of light-emitting devices, such that the groups cooperate to produce a composite beam of light having a prescribed luminous flux spectrum.

A lighting fixture for producing a beam of light having a prescribed luminous flux spectrum, the lighting fixture comprising:

three or more groups of light-emitting devices, each such group configured to emit light having a distinct luminous flux spectrum with a predetermined peak flux wavelength and a predetermined spectral half-width;
wherein the peak flux wavelength of each of the four or more groups of light-emitting devices is spaced less than about 50 nanometers from the peak flux wavelength of another of the groups of light-emitting devices;
and wherein the spectral half-width of each of the four or more groups of light-emitting devices is less than about 40 nanometers;
and
a controller configurable to supply selected amounts of electrical power to the four or more groups of light-emitting devices, such that the groups cooperate to produce a composite beam of light having a prescribed luminous flux spectrum.

2 more elements

Dependencies are inferred from the claim text.

Lighting fixture for producing a beam of light having a controlled luminous flux spectrum

Life of this patent

Lighting fixture for producing a beam of light having a controlled luminous flux spectrum

Life of this patent

Abstract

Claims43