US Patent No. 10,477,636

LIGHTING SYSTEMS HAVING MULTIPLE LIGHT SOURCES


Patent No. 10,477,636
Issue Date November 12, 2019
Title Lighting Systems Having Multiple Light Sources
Inventorship Raghuram L. V. Petluri, Cerritos, CA (US)
Paul Pickard, Acton, CA (US)
Assignee ECOSENSE LIGHTING INC., Los Angeles, CA (US)

Claim of US Patent No. 10,477,636

1. A lighting system, comprising:a first light source that includes a first semiconductor light-emitting device and includes a first lumiphor configured for converting light emissions of the first semiconductor light-emitting device having a first spectral power distribution into first light source emissions having another spectral power distribution being different than the first spectral power distribution, wherein the first light source is configured for emitting the first light source emissions as having a first color point, wherein the first color point is located between an isotherm of a correlated color temperature of about 4800K and an isotherm of a correlated color temperature of about 2500K, and wherein the first color point is located within a distance of about equal to or less than 0.006 delta(uv) away from a Planckian-black-body locus of the International Commission on Illumination (CIE) 1931 XY chromaticity diagram;
a second light source that includes a second semiconductor light-emitting device, wherein the second light source is configured for emitting second light source emissions having a second color point, wherein the second color point is located between an isotherm of a correlated color temperature of about 2900K and an isotherm of a correlated color temperature of about 1700K; and
a third light source that includes a third semiconductor light-emitting device, wherein the third light source is configured for emitting third light source emissions having a third color point, wherein the third color point is located between a line-of-purples of the CIE 1931 XY chromaticity diagram and an isotherm of a correlated color temperature of about 1500K, and wherein the third light source is configured for emitting the third light source emissions as having a dominant- or peak-wavelength being within a range of between about 590 nanometers and about 700 nanometers;
wherein the lighting system forms combined light emissions having a series of combined color points, wherein the combined light emissions include the first light source emissions, and the second light source emissions, and the third light source emissions; and
wherein the lighting system causes the series of the combined color points of the combined light emissions to emulate color points of an incandescent light emitter by causing a progression of the series of the combined color points to remain below the Planckian-black-body locus throughout a light brightening/dimming curve of correlated color temperatures (CCTs).