Melanopic light system with high CRI using cyan direct emitters
The invention provides a light generating system ( 1000 ) comprising one or more first light generating devices ( 110 ), one or more second light generating devices ( 120 ), and one or more third light generating devices ( 130 ), wherein: —the one or more first light generating devices ( 110 ) are configured to generate white first device light ( 111 ) having a first color rendering index CRI 1 and a first correlated color temperature Tc 1 ; —the one or more second light generating devices ( 120 ) are configured to generate white second device light ( 121 ) having a second color rendering index CRI 2 and a second correlated color temperature Tc 2 ; —the one or more third light generating devices ( 130 ) are configured to generate third device light ( 131 ) having a third dominant wavelength λd 3 selected from the range of 470-500 nm; —CRI 1 −CRI 2 ≥10; CRI 1 ≥85; Tc 2 −Tc 1 ≥1000K; Tc 1 ≤3500K; and Tc 2 ≥3000K; and—the light generating system ( 1000 ) is configured to generate system light ( 1001 ) comprising one or more of the first device light ( 111 ), the second device light ( 121 ), and the third device light ( 131 ).
1. A tunable light generating system comprising one or more first light generating devices, one or more second light generating devices, and one or more third light generating devices, wherein:
the one or more first light generating devices are configured to generate white first device light having a first color rendering index (CRI 1 ) and a first correlated color temperature (Tc 1 );
the one or more second light generating devices are configured to generate white second device light having a second color rendering index (CRI 2 ) and a second correlated color temperature (Tc 2 );
the one or more third light generating devices are configured to generate third device light having a third dominant wavelength (λd 3 ) selected from the range of 470-500 nm;
CRI 1 −CRI 2 ≥10; CRI 1 ≥85; Tc 2 −Tc 1 ≥1000 K; Tc 1 ≤3500 K; and Tc 2 ≥3000 K; and
the tunable light generating system is configured to generate system light comprising one or more of the white first device light, the white second device light, and the third device light,
the tunable light generating system further comprising (i) a first LED string comprising the one or more first light generating devices, and (ii) a second LED string comprising the one or more second light generating devices and the one or more third light generating devices, and
the tunable light generating system being configured to control the ratio of the first LED string and the second LED string.
2. The tunable light generating system according claim 1 , wherein Tc 1 ≤3400 K and wherein Tc 2 ≥3400 K.
3. The tunable light generating system according to claim 1 , wherein the third dominant wavelength (λd 3 ) is selected from the range of 470-490 nm.
4. The tunable light generating system according to claim 1 , wherein the third dominant wavelength (λd 3 ) is selected from the range of 478-484 nm.
5. The tunable light generating system according to claim 1 , wherein Tc 2 −Tc 1 ≥2500K; CRI 1 −CRI 2 ≥15; and CRI 1 ≥90.
6. The tunable light generating system according to claim 1 , wherein in an operational mode of the light generation system the system light has a CRI of at least 80, a Color Rendering R9 (R9) value of at least 50, and a Melanopic Daylight Efficacy Ratio (MDER) value selected from the range of 0.45-1.3, wherein MDER is defined as:
MDER
=
1.104
*
∑
λ
=
3
8
0
7
8
0
SPD
(
λ
)
m
(
λ
)
Δ
λ
∑
λ
=
3
8
0
7
8
0
SPD
(
λ
)
V
(
λ
)
Δ
λ
(
eq
.
3
a
)
wherein SPD(λ) is the spectral power distribution of the system light, m(λ) is the melanopic sensitivity function, and V(λ) is the photopic luminosity function.
7. The tunable light generating system according to claim 1 , wherein the white second device light comprises (i) a first emission band having a peak wavelength below 490 nm and having a first full width at half maximum defined by a first smaller wavelength and a first larger wavelength (λb 1 R), and (ii) a second emission band having maximum intensity at a wavelength selected from the range of 500-650 nm and having a second full width at half maximum defined by a second smaller wavelength (λb 2 B) and a second larger wavelength, wherein 35 nm≤λb 2 B−λb 1 R≤55 nm.
8. The tunable light generating system according to claim 1 , wherein the system light has a color point within about 15 SDCM from the Black Body Locus (BBL).
9. The light generating system according to claim 8 , wherein the one or more second light generating devices comprises n2 second light generating devices and the one or more third light generating devices comprises n3 third light generating devices, wherein n2≥1 and n3≥1, and wherein n3/n2≥0.25.
10. The tunable light generating system according to claim 1 , wherein the one or more first light generating devices comprises n1 first light generating devices, the one or more second light generating devices comprises n2 second light generating devices, and the one or more third light generating devices comprises n3 third light generating devices, wherein n1≥6, n2≥3, and n3≥3, wherein the third light generating devices have shortest distances to each other, wherein the shortest distances ≤3.5 cm.
11. The tunable light generating system according to claim 1 , further comprising a control system configured to control (i) at least one of the one or more first light generating devices, (ii) at least one of the one or more second light generating devices, and (iii) at least one of the one or more third light generating devices.
12. The tunable light generating system according to claim 11 , further comprising an input device selected from the group consisting of a user interface, a time device, and a sensor, wherein the control system is configured to control a spectral power distribution of the system light in response to a signal of the input device.
13. The tunable light generating system according to claim 6 , further comprising a control system configured to control (i) at least one of the one or more first light generating devices, (ii) at least one of the one or more second light generating devices, and (iii) at least one of the one or more third light generating devices, and
wherein the control system is configured to control in an operational mode the spectral power distribution of the system light while maintaining the defined MDER value.
14. The tunable light generating system according to claim 1 , configured to generate in one or more operational modes white system light comprising the white first device light, the white second device light and the third device light, wherein the system light has a CRI of at least 80 and a Color Rendering R9 (R9) of at least 85.
15. A lamp or a luminaire comprising the tunable light generating system according to claim 1 .