US 8,506,114 B2 · Lighting devices, methods of lighting, light filters and methods of filtering light

Abstract

A lighting device comprising a white light source, a filter which filters blue light from the white light, and a second light source which emits red light and/or reddish-orange light. In some embodiments, the white light source comprises a solid state light emitter. A method of lighting, comprising illuminating a white light source, illuminating a red and/or reddish-orange light source, the light sources being positioned and oriented such that the light mixes, and filtering blue light from the mixed light. A method of lighting, comprising illuminating a white light source, filtering blue light from the white light, and illuminating a red and/or reddish-orange light source. A light filter, comprising a first filter component which has a wall region and a window region, and a second filter component comprising two or more reflection regions. Also, methods of filtering.

Claims38

Dependent claims

A lighting device comprising:

a first light source which, if illuminated, emits white light at a first color point;
a first filter which, if said white light emitted from said first light source is directed toward said first filter, would filter at least some blue light from said white light to form modified light at a second color point which is different from the first color point;
and
a second light source which, if illuminated, emits light of at least one color selected from among the group consisting of red light and reddish-orange light,
wherein a mixture of said modified light and light emitted from said second light source would produce mixed light which is white light having x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within ten MacAdam ellipses of at least one point on a 1931 CIE Chromaticity Diagram blackbody locus.

2 more elements

A method of lighting, comprising:

illuminating a first light source, whereby said first light source emits a first light mixture, said first light mixture comprising blue light and other light, said first light mixture appearing white at a first color point;
illuminating a second light source, whereby said second light source emits second light of at least one color selected from among the group consisting of red light and reddish-orange light, and
filtering at least a portion of said blue light from said first light mixture so that the first light mixture minus said portion of blue light would be at a second color point which different from the first color point,
a mixture of said first light mixture and said second light minus said portion of blue light providing filtered mixed light, said filtered mixed light being white light at a color point which is within ten MacAdam ellipses of at least one point on a 1931 CIE Chromaticity Diagram blackbody locus.

1 more element

Dependencies are inferred from the claim text.

Lighting devices, methods of lighting, light filters and methods of filtering light

Life of this patent

Lighting devices, methods of lighting, light filters and methods of filtering light

Life of this patent

Abstract

Claims38