Tunable white lighting system with high color fidelity and adjustable melanopic content
A light emitting device includes four primary light sources, the first light source emits light with an emission spectrum having a first peak in a wavelength in a range of 420-440 nm and a second peak in a wavelength range of 530-580 nm, the second light source emits light with an emission spectrum having a peak in a wavelength in a range of 470-500 nm, the third light source emits light with an emission spectrum having a peak in a wavelength range of 530-580 nm, and the fourth light source emits light with an emission spectrum having a peak in a wavelength range of 580-660 nm.
1 . A lighting device comprising:
a first primary light source, the first primary light source comprising a first pump die configured to emit first pump light having a peak light emission wavelength in a range of 420-440 nm, and a first downconverter configured to absorb a portion of first pump light and emit a first downconverter light having a peak emission in a wavelength range of 530-580 nm, a portion of unconverted first pump light and first downconverter light combine to form a first light;
a second primary light source, the second primary light source comprising a second pump die configured to emit second pump light having a peak light emission wavelength in a range of 470-500 nm, and a second downconverter configured to absorb a portion of second pump light and emit a second downconverter light having a peak emission in a wavelength range of 495-580 nm, a portion of unconverted second pump light and second downconverter light combine to form a second light;
a third primary light source, the third primary light source comprising a third pump die configured to emit third pump light having a peak light emission wavelength in a range of 440-460 nm, and a third downconverter configured to absorb substantially all third pump light and emit a third downconverter light having a peak emission in a wavelength range of 530-580 nm, substantially all of the third pump light is converted to third downconverter light to form a third light; and
a fourth primary light source, the fourth primary light source comprising a fourth pump die configured to emit fourth pump light having a peak light emission wavelength in a range of 440-460 nm, and a fourth downconverter configured to absorb substantially all fourth pump light and emit a fourth downconverter light having a peak emission in a wavelength range of 580-660 nm, substantially all of fourth downconverter light is converted to form a fourth light.
2 . The light emitting device of claim 1 , wherein the first light has an MDER less than 0.35.
3 . The light emitting device of claim 1 , wherein second light has an MDER greater than 0.65.
4 . The lighting device of claim 1 , wherein first primary light source comprises a first electrical connection for providing a first bias to the first pump die, the second primary light source comprises a second electrical connection for providing a second bias to the second pump die, the third primary light source comprises a third electrical connection for providing a third bias to the third pump die, and the fourth primary light source comprises a fourth electrical connection for providing a fourth bias to the fourth pump die.
5 . The lighting device of claim 4 , further comprising a controller, the controller configured to independently input a first bias to control an amount of first light, a second bias to control an amount of second light, a third bias to control an amount of third light, and a fourth bias to control an amount of fourth light.
6 . The light emitting device of claim 5 , wherein the controller comprises a memory configured to store one or more sets of predetermined first, second, third, and fourth bias values for providing a combined light formed from the amount of first light, the amount of second light, the amount of third light, and the amount of fourth light, the combined light having a CCT value, a luminous flux value, and one of an Ra value, a TM-30-18 Rf value, an Rcs,h1value, or an MDER value.
7 . The light emitting device of claim 6 , wherein the combined light has a CCT value between 2000K and 10000K, a Ra value>80, and an MDER value between 0.25 to 1.39.
8 . The light emitting device of claim 1 , wherein the first light has a CIE 1976 color point in the range of 0.18<u′<0.4, v′<0.42, the second light has a color point in the range of u′<0.18, v′>0.25, the third light has a color point in the range of 0.18<u′<0.25, v′>0.53, and the fourth light has a color point in the range of u′>0.35, v′>0.50.
9 . A light emitting device comprising:
a first primary light source configured to emit a first light having a CIE 1976 color point in the range of 0.18<u′<0.4, v′<0.42;
a second primary light source configured to emit a second light having a CIE 1976 color point in the range of u′<0.18, v′>0.25;
a third primary light source configured to emit a third light having CIE 1976 color point in the range of 0.18<u′<0.25, v′>0.53; and
a fourth primary light source configured to emit a fourth light having a CIE 1976 color point in the range of u′>0.35, v′>0.50.
10 . The lighting device of claim 9 , wherein the first light has an MDER less than 0.35.
11 . The lighting device of claim 9 , wherein the second light has an MDER greater than 0.65.
12 . The lighting device of claim 9 , wherein an adjustable amount of the first light, an adjustable amount of the second light, an adjustable amount of the third light, and an adjustable amount of the fourth light are configured to combine to form a combined light.
13 . The lighting device of claim 12 , wherein the combined light maintains a Ra>90 for CCT(K) values between 2000K and 10000K.
14 . The lighting device of claim 12 , wherein the combined light has an MDER in the range of 0.25 to 1.39.
15 . The lighting device of claim 12 , wherein an MDER of the combined light can be varied between 90% to 100% of a reference source MDER while maintaining a set CCT(K) and a Ra>80, the reference source is a black body radiator below CCT values of 5000K, and a CIE D illuminant above CCT values of 5000K.
16 . The lighting device of claim 9 , wherein first primary light source comprises a first electrical connection for providing a first bias to the first pump die, the second primary light source comprises a second electrical connection for providing a second bias to the second pump die, the third primary light source comprises a third electrical connection for providing a third bias to the third pump die, and the fourth primary light source comprises a fourth electrical connection for providing a fourth bias to the fourth pump die.
17 . The lighting device of claim 16 , further comprising a controller electrically connected to each of the first electrical connection, second electrical connection, third electrical connection, and fourth electrical connection, the controller providing the first bias, second bias, third bias, and fourth bias, the controller including a memory, the memory configured to store first, second, third, and fourth bias values for producing a combined light with CCT(K) values in a range of 2000K to 10000K and MDER in a range of 0.25 to 1.39.
18 . A lighting device comprising:
a plurality of first primary light sources, each first primary light source comprising a violet pump die and green phosphor disposed on the violet pump die, the violet pump die and green phosphor contained in a first package;
a plurality of second primary light sources, each second primary light source comprising a cyan-blue pump die and a green phosphor disposed on the cyan-blue pump die, the cyan-blue pump die and green phosphor contained in a second package and configured to emit a light having a CIE 1976 color point in the range of u′<0.18, v′>0.25;
a plurality of third light sources, each third primary light source comprising a royal-blue pump die and a green phosphor disposed on the royal-blue pump die, the royal-blue pump die and green phosphor contained in a third package; and
a plurality of fourth primary light sources, each fourth primary light source comprising another royal-blue pump die and a red phosphor disposed on the another royal-blue pump die, the another royal-blue pump die and red phosphor contained in a fourth package,
the first, second, third, and fourth packages are each separate packages.
19 . The lighting device of claim 18 , wherein the first package emits a light having an MDER less than 0.35.
20 . The lighting device of claim 18 , wherein the second package emits a light having an MDER greater than 0.65.