US 7,768,192 B2Granted

Lighting device and lighting method

AssigneeCree LED Lighting Solutions, Inc.

InventorsAntony Paul Van De Ven, Gerald H. Negley

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Abstract

A lighting device comprising sources of visible light comprising solid state light emitters and/or luminescent materials emitting three or four different hues. A first group of the sources, when illuminated, emit light of two hues which, if combined, would produce illumination having coordinates within an area on a 1931 CIE Chromaticity Diagram defined by points having coordinates: 0.59, 0.24; 0.40, 0.50; 0.24, 0.53; 0.17, 0.25; and 0.30, 0.12. A second group of the sources is of an additional hue. Mixing light from the first and second groups produces illumination within ten MacAdam ellipses of the blackbody locus. Also, a lighting device comprising a white light source having a CRI of 75 or less and at least one solid state light emitters and/or luminescent material. Also, methods of lighting.

Claims78

Dependent claims

A lighting device comprising:

a plurality of sources of visible light, said sources of visible light each being independently selected from among solid state light emitters and luminescent materials, each source of visible light, when illuminated, emitting light of a hue, said sources of visible light, when illuminated, emitting in total three different hues,
said sources of visible light comprising a first group of sources of visible light and a second group of sources of visible light,
said first group of sources of visible light comprising sources of visible light which, when illuminated, emit light of two hues which, if mixed in the absence of any other light, produce a first group mixed illumination which would have x,y color coordinates which are within an area on a 1931 CIE Chromaticity Diagram defined by five points having x,y coordinates:
0.59, 0.24;
0.40, 0.50;
0.24, 0.53;
0.17, 0.25;
and 0.30, 0.12,
said second group of sources of visible light comprising at least one source of visible light of a first additional hue,
wherein mixing of light from said first group of sources of visible light and light from said second group of sources of visible light produces a first group-second group mixed illumination of a hue which is within ten MacAdam ellipses of at least one point on a blackbody locus on said 1931 CIE Chromaticity Diagram.

7 more elements

A lighting device comprising:

a plurality of sources of visible light, said sources of visible light each being independently selected from among solid state light emitters and luminescent materials, each source of visible light, when illuminated, emitting light of a hue, said sources of visible light, when illuminated, emitting in total four different hues,
said sources of visible light comprising a first group of sources of visible light and a second group of sources of visible light,
said first group of sources of visible light comprising sources of visible light which, when illuminated, emit light of two hues which, if mixed in the absence of any other light, produce a first group mixed illumination which would have x,y color coordinates which are within an area on a 1931 CIE Chromaticity Diagram defined by five points having x,y coordinates:
0.59, 0.24;
0.40, 0.50;
0.24, 0.53;
0.17, 0.25;
and 0.30, 0.12,
said second group of sources of visible light comprising at least one source of visible light of a first additional hue and at least one source of visible light of a second additional hue;
wherein mixing of light from said first group of sources of visible light and light from said second group of sources of visible light produces a first group-second group mixed illumination of a hue which is within ten MacAdam ellipses of at least one point on a blackbody locus on said 1931 CIE Chromaticity Diagram.

7 more elements

A lighting device comprising:

a plurality of sources of visible light, said sources of visible light each being independently selected from among solid state emitters and luminescent materials, each of said sources of visible light, when illuminated, emitting light of a hue, said sources of visible light, when illuminated, emitting in total at least three different hues,
said sources of visible light comprising a first group of sources of visible light and a second group of sources of visible light,
said first group of sources of visible light comprising sources of visible light which, when illuminated, emit light of at least two hues which, if mixed in the absence of any other light, produce a first group mixed illumination which would have color x,y coordinates which are within an area on a 1931 CIE Chromaticity Diagram defined by five points having x,y coordinates:
0.59, 0.24;
0.40, 0.50;
0.24, 0.53;
0.17, 0.25;
and 0.30, 0.12,
said second group of sources of visible light comprising at least one additional source of visible light,
wherein mixing of light from said first group of sources of visible light and light from said second group of sources of visible light produces a first group-second group mixed illumination of a hue which is within ten MacAdam ellipses of at least one point on a blackbody locus on said 1931 CIE Chromaticity Diagram,
and wherein an intensity of at least one of said hues is at least 35% of an intensity of said first group-second group mixed illumination.

8 more elements

A method of lighting, comprising:

mixing light from a plurality of sources of visible light, said sources of visible light each being independently selected from among solid state light emitters and luminescent materials, each source of visible light, when illuminated, emitting light of a hue, said sources of visible light, when illuminated, emitting in total three different hues,
said sources of visible light comprising a first group of sources of visible light and a second group of sources of visible light,
said first group of sources of visible light comprising sources of visible light which, when illuminated, emit light of two hues which, if mixed in the absence of any other light, produce a first group mixed illumination which would have x,y color coordinates which are within an area on a 1931 CIE Chromaticity Diagram defined by five points having x,y coordinates:
0.59, 0.24;
0.40, 0.50;
0.24, 0.53;
0.17, 0.25;
and 0.30, 0.12,
said second group of sources of visible light comprising at least one source of visible light of a first additional hue,
wherein mixing of light from said first group of sources of visible light and light from said second group of sources of visible light produces a first group-second group mixed illumination of a hue which is within ten MacAdam ellipses of at least one point on a blackbody locus on said 1931 CIE Chromaticity Diagram.

7 more elements

A method of lighting, comprising:

mixing light from a plurality of sources of visible light, said sources of visible light each being independently selected from among solid state light emitters and luminescent materials, each source of visible light, when illuminated, emitting light of a hue, said sources of visible light, when illuminated, emitting in total four different hues,
said sources of visible light comprising a first group of sources of visible light and a second group of sources of visible light,
said first group of sources of visible light comprising sources of visible light which, when illuminated, emit light of two hues which, if mixed in the absence of any other light, produce a first group mixed illumination which would have x,y color coordinates which are within an area on a 1931 CIE Chromaticity Diagram defined by five points having x,y coordinates:
0.59, 0.24;
0.40, 0.50;
0.24, 0.53;
0.17, 0.25;
and 0.30, 0.12,
said second group of sources of visible light comprising at least one source of visible light of a first additional hue and at least one source of visible light of a second additional hue;
wherein mixing of light from said first group of sources of visible light and light from said second group of sources of visible light produces a first group-second group mixed illumination of a hue which is within ten MacAdam ellipses of at least one point on a blackbody locus on said 1931 CIE Chromaticity Diagram.

7 more elements

A method of lighting, comprising:

mixing light from a plurality of sources of visible light, said sources of visible light each being independently selected from among solid state emitters and luminescent materials, each of said sources of visible light, when illuminated, emitting light of a hue, said sources of visible light, when illuminated, emitting in total at least three different hues,
said sources of visible light comprising a first group of sources of visible light and a second group of sources of visible light,
said first group of sources of visible light comprising sources of visible light which, when illuminated, emit light of at least two hues which, if mixed in the absence of any other light, produce a first group mixed illumination which would have color x,y coordinates which are within an area on a 1931 CIE Chromaticity Diagram defined by five points having x,y coordinates:
0.59, 0.24;
0.40, 0.50;
0.24, 0.53;
0.17, 0.25;
and 0.30, 0.12,
said second group of sources of visible light comprising at least one source of visible light,
wherein mixing of light from said first group of sources of visible light and light from said second group of sources of visible light produces a first group-second group mixed illumination of a hue which is within ten MacAdam ellipses of at least one point on a blackbody locus on said 1931 CIE Chromaticity Diagram,
and wherein an intensity of at least one of said hues is at least 35% of an intensity of said first group-second group mixed illumination.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/613,714Filed 20 Dec 2006 · us provisional application
Priority: 21 Dec 2005
Published: US 2007/0139920 A121 Jun 2007
Granted: 3 Aug 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

F21K 9/00
Light sources using semiconductor devices as light-generating elements
F21K 9/60
Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers: optical arrangements…
G09G 3/2003
For presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged…:…
H05B 45/20
Circuit arrangements for operating light-emitting diodes [LED]: controlling the colour of the light