Two-channel tunable lighting systems with controllable equivalent melanopic lux and correlated color temperature outputs
The present disclosure provides lighting systems suitable for generating white light. The lighting systems can have a first lighting channel configured to produce a first white light having a first color point and a first spectral power distribution, a second lighting channel configured to produce a second white light having a second color point and a second spectral power distribution, and a control system configured to independently change the intensity of each of the first lighting channel and the second lighting channel. The first lighting channels can have LEDs having an emission with a first peak wavelength of between about 440 nm and about 510 nm. The second lighting channels can have LEDs having an emission with a second peak wavelength of between about 380 nm and about 420 nm. The disclosure provides methods of generating white light using the lighting systems described.
1. A lighting system comprising:
a first white lighting channel configured to produce a first white light having a first color point and a first spectral power distribution and exhibiting a first Equivalent Melanopic Lux (EML) value;
a second white lighting channel configured to produce a second white light having a second color point and a second spectral power distribution and exhibiting a second Equivalent Melanopic Lux (EML) value wherein the second EML value is at least twice that of the first EML value; and
a control system configured to independently change the intensity of each at least one of the first lighting channel and the second lighting channel;
wherein the first white light and second white light combined together form a third white light having a third color point and a third spectral power distribution;
wherein the control system is further configured to change the intensity of each of the first lighting channel and the second lighting channel to provide the third white light with the third color point at a plurality of points along a predefined path near the black body locus in the 1931 CIE Chromaticity Diagram between and including both the first color point and the second color point;
wherein the first spectral power distribution has a first circadian-stimulating energy characteristic, the second spectral power distribution has a second circadian stimulating energy characteristic, and the third spectral power distribution has a third circadian-stimulating energy characteristic; wherein the third white light at each of the plurality of points along the predefined path has an Ra value greater than or equal to 80.
2. The lighting system as claimed in claim 1 , wherein the first color point has a CCT between about 4000K and about 6500K.
3. The lighting system of claim 1 , wherein the first color point has a CCT of about 4000K.
4. The lighting system of claim 1 , wherein the second color point has a CCT between about 2700K and about 1800K.
5. The lighting system of claim 1 , wherein the second color point has a CCT of about 2400K.
6. The lighting system of claim 1 , wherein the first lighting channel comprises an LED having an emission with a first peak wavelength of between about 440 nm and about 510 nm.
7. The lighting system of claim 1 , wherein the second lighting channel comprises an LED having an emission with a second peak wavelength of between about 380 nm and about 420 nm.