US 12,666,510 B2Granted

Lighting apparatus

AssigneeShu-Mei Ku

InventorCheng-Tao Yang

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Abstract

A lighting apparatus includes a light source unit including first, second and third white light source groups each of which is capable of emitting a white light, and a control unit. The first, second and third white light source groups have different correlated color temperatures. The control unit is electrically connected to the light source unit, and controls brightness of the first, second and third white light source groups to allow a light mixed by the first, second and third white light source groups to be substantially similar to sunlight.

Claims19

Dependent claims

A lighting apparatus, comprising:

a light source unit including a first white light source group, a second white light source group and a third white light source group each of which is capable of emitting a white light, wherein
in a CIE chromaticity diagram, chromaticity coordinates of said first white light source group, said second white light source group and said third white light source group are defined as a first coordinate, a second coordinate and a third coordinate, respectively,
said first white light source group, said second white light source group and said third white light source group have different correlated color temperatures,
in the CIE chromaticity diagram, a first line has three line segments each of which interconnects two corresponding ones of the first coordinate, the second coordinate and the third coordinate, said first line intersecting a blackbody radiation locus, and enclosing and defining a first chromaticity region, a portion of the blackbody radiation locus being located within the first chromaticity region,
in the CIE chromaticity diagram, a chromaticity coordinate of a light mixed by said first white light source group, said second white light source group and said third white light source group is defined as a mixed light coordinate,
in the CIE chromaticity diagram, the second coordinate is positioned within a quadrilateral region formed by four lines interconnecting a first point represented by coordinate of (x=0.47095, y=0.417), a second point represented by coordinate of (x=0.36139, y=0.36706), a third point represented by coordinate of (x=0.53479, y=0.5279) and a fourth point represented by coordinate of (x=0.37516, y=0.44772) in an xy chromaticity space;
and
a control unit that is electrically connected to the light source unit, such that when said control unit provides an electrical energy to said light source unit to control brightness of each of said first white light source group, said second white light source group and said third white light source group, the mixed light coordinate moves within the first chromaticity region.

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Dependencies are inferred from the claim text.

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Abstract

A lighting apparatus, comprising:

a light source unit including a first white light source group, a second white light source group and a third white light source group each of which is capable of emitting a white light, wherein
in a CIE chromaticity diagram, chromaticity coordinates of said first white light source group, said second white light source group and said third white light source group are defined as a first coordinate, a second coordinate and a third coordinate, respectively,
said first white light source group, said second white light source group and said third white light source group have different correlated color temperatures,
in the CIE chromaticity diagram, a first line has three line segments each of which interconnects two corresponding ones of the first coordinate, the second coordinate and the third coordinate, said first line intersecting a blackbody radiation locus, and enclosing and defining a first chromaticity region, a portion of the blackbody radiation locus being located within the first chromaticity region,
in the CIE chromaticity diagram, a chromaticity coordinate of a light mixed by said first white light source group, said second white light source group and said third white light source group is defined as a mixed light coordinate,
in the CIE chromaticity diagram, the second coordinate is positioned within a quadrilateral region formed by four lines interconnecting a first point represented by coordinate of (x=0.47095, y=0.417), a second point represented by coordinate of (x=0.36139, y=0.36706), a third point represented by coordinate of (x=0.53479, y=0.5279) and a fourth point represented by coordinate of (x=0.37516, y=0.44772) in an xy chromaticity space;
and
a control unit that is electrically connected to the light source unit, such that when said control unit provides an electrical energy to said light source unit to control brightness of each of said first white light source group, said second white light source group and said third white light source group, the mixed light coordinate moves within the first chromaticity region.

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