A light generating system comprising a first, second, and third light generating device and a control system

Abstract

The invention provides a light generating system (1000) comprising a first light generating device (110), a second light generating device (120), a third light generating device (130), and a control system (3000); wherein: (A) the first light generating device (110) comprises a first solid state light source (10) configured to generate first light source light (11) and a first luminescent converter (2100); (B) the second light generating device (120) comprises a second solid state light source (20) configured to generate second light source light (21) and a second luminescent converter (2200); (C) the third light generating device (130) comprises a third solid state light source (30) configured to generate third light source light (31) and a third luminescent converter (2300); (D) the first, second, and third luminescent converter (2100, 2200, 2300) comprise a narrowband luminescent material (400); wherein the first and second luminescent converter (2100, 2200) further comprise a green-yellow luminescent material (200) and a broadband luminescent material (300); (E) the green-yellow luminescent material (200) is configured to convert the first and second light source light (11, 21) into green-yellow luminescent material light (201); (F) the broadband luminescent material (300) is configured to convert (a) the first and second light source light (11, 21) and / or (b) the green-yellow luminescent material light (201) into broadband luminescent material light (301) having a broadband centroid wavelength (λcb) of 600-670 nm; (G) the narrowband luminescent material (400) is configured to convert the first, second, and third light source light (11,21,31) into narrowband luminescent material light (401) having a narrowband centroid wavelength (λcn) of 610-650 nm; (H) the first light generating device (110) is configured to generate white first device light (111); (I) the second light generating device (120) is configured to generate white second device light (121); wherein: (i) a relative spectral power of the broadband luminescent material light (301) and / or the narrowband luminescent material light (401) in the second device light (121) differs from that in the first device light (111); (J) the third light generating device (130) is configured to generate third device light (131) having a third device centroid wavelength (λcd3) of 610-650 nm; (K) the light generating system (1000) is configured to generate system light (1001) comprising the first, second, and / or third device light (111,121,131); and (L) the control system (3000) is configured to control a spectral power distribution of the system light (1001) by individually controlling the first, second, and third light generating device (110, 120, 130).

Description

[0001] 2024PF80392

[0002] 1

[0003] A light generating system comprising a first, second, and third light generating device and a control system

[0004] FIELD OF THE INVENTION

[0005] The invention relates to a light generating system. The invention further relates to a lighting device comprising the light generating system.

[0006] BACKGROUND OF THE INVENTION

[0007] Light generating systems are known in the art. For instance, US2024120448A1 describes a red-light emitting device comprising: a blue LED chip; and a photoluminescence material comprising a narrowband red fluoride phosphor and a broadband red phosphor. The narrowband red phosphor may comprise a manganese-activated fluoride phosphor of composition K2SiF6:Mn4+, K2GeF6:Mn4+, and K2TiF6:Mn4+.

[0008] SUMMARY OF THE INVENTION

[0009] Conventional light generating systems (e.g. incandescent or fluorescent lamps) are rapidly being replaced by light emitting diode (LED) based lighting solutions. LED-based lighting solutions may generally comprise a light source and a luminescent converter, wherein the luminescent converter may comprise multiple types of phosphors, e.g. a yellow and a red phosphor, to produce especially white light with a suitable color temperature. To provide white light with a good representation of (strong) red colors, the use of a phosphor (or “luminescent material”) providing red luminescent material light may be needed.

[0010] However, prior art solutions may have problems providing a reliable red color (over time and / or during operation), as phosphors may be thermally quenched, or may degrade over time, allowing less red light to be emitted from the phosphor. Hence, a color discrepancy may occur over time and / or during operation, leading to a worse representation of red colors and requiring such LED-based lighting solutions to be discarded well before their prospected lifespan has passed. This is undesirable from an economic and durability standpoint. Further, it may be desirable to adjust a spectral power distribution of a system light in the red wavelength range, to allow control over e.g. a color rendering index of said system light. Hence, it is an aspect of the invention to provide an alternative light generating system,2024PF80392

[0011] 2

[0012] which preferably further at least partly obviates one or more of above-described drawbacks. The present invention may have as object to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.

[0013] According to a first aspect, the invention provides a light generating system comprising a first light generating device, a second light generating device, a third light generating device, and a control system. The first light generating device may comprise a first solid state light source and a first luminescent converter. Especially, the first solid state light source may be configured to generate first light source light having a first peak emission wavelength (λp₁) selected from the range of 380-500 nm, such as from the range of 380-490 nm. Further, the first luminescent converter may be configured in a light receiving relationship with the first solid state light source. The second light generating device may comprise a second solid state light source and a second luminescent converter. Especially, the second solid state light source may be configured to generate second light source light having a second peak emission wavelength (λp₂) selected from the range of 380-500 nm, such as from the range of 380-490 nm. Further, the second luminescent converter may be configured in a light receiving relationship with the second solid state light source. The third light generating device may comprise a third solid state light source and a third luminescent converter. Especially, the third solid state light source may be configured to generate third light source light having a third peak emission wavelength (λp₃) selected from the range of 380-500 nm, such as from the range of 380-490 nm. Further, the third luminescent converter may be configured in a light receiving relationship with the third solid state light source. Each of the first luminescent converter, the second luminescent converter, and the third luminescent converter may comprise a narrowband luminescent material. Additionally, the first luminescent converter and the second luminescent converter may each further comprise a green-yellow luminescent material and a broadband luminescent material. The greenyellow luminescent material may be configured to convert at least part of respectively the first light source light and the second light source light received by the green-yellow luminescent material into green-yellow luminescent material light. Especially, the greenyellow luminescent material light may have a green-yellow centroid wavelength (λcg) individually selected (for each of the first light generating device and the second light generating device) from the range of 480-600 nm, such as from the range of 490-590 nm. Further, the broadband luminescent material may be configured to convert at least part of respectively the first light source light and the second light source light received by the broadband luminescent material into broadband luminescent material light. Additionally or2024PF80392

[0014] 3

[0015] alternatively, the broadband luminescent material may be configured to convert at least part of the green-yellow luminescent material light received by the broadband luminescent material into broadband luminescent material light. The broadband luminescent material light may have a broadband centroid wavelength (Xcb) individually selected (for each of the first light generating device and the second light generating device) from the range of 590-680 nm, such as from the range of 600-670 nm. Further, the broadband luminescent material light may comprise at least one emission band having a broadband full width at half maximum FWHMb of > 50 nm, such as > 60 nm. The narrowband luminescent material may be configured to convert at least part of respectively the first light source light, the second light source light, and the third light source light received by the narrowband luminescent material into narrowband luminescent material light. Especially, the narrowband luminescent material light may have a narrowband centroid wavelength (λcn) individually selected (for each of the first light generating device, the second light generating device, and the third light generating device) from the range of 600-660 nm, such as from the range of 610-650 nm. Further, the narrowband luminescent material light may comprise at least one emission band having a narrowband full width at half maximum FWHMn of < 50 nm, such as < 40 nm. The first light generating device may be configured to generate first device light comprising at least part of the first light source light, the green-yellow luminescent material light, the broadband luminescent material light, and the narrowband luminescent material light. Especially, the first device light may be white light having a first correlated color temperature (CCTi).

[0016] Further, the second light generating device may be configured to generate second device light comprising at least part of the second light source light, the green-yellow luminescent material light, the broadband luminescent material light, and the narrowband luminescent material light. Especially, the second device light may be white light having a second correlated color temperature (CCT2). In embodiments, (CCT2 - CCTi) > 300 K may apply, such as (CCT2 - CCTi) > 500 K. Further, a relative spectral power of the broadband luminescent material light in the second device light may differ from a relative spectral power of the broadband luminescent material light in the first device light. Additionally or alternatively, a relative spectral power of the narrowband luminescent material light in the second device light may differ from a relative spectral power of the narrowband luminescent material light in the first device light. In embodiments, the third light generating device may be configured to generate third device light comprising the narrowband luminescent material light. The third device light may especially have a third device centroid wavelength (λcd3) selected from the range of 600-660 nm, such as from the range of 610-650 nm. Further, the2024PF80392

[0017] 4

[0018] light generating system may be configured to generate system light comprising one or more of the first device light, the second device light, and the third device light. Especially, the control system may be configured to control, in an operational mode of the light generating system, a spectral power distribution of the system light in the wavelength range of 380-780 nm by individually controlling the first light generating device, the second light generating device, and the third light generating device. In embodiments, the system light, in said operational mode, may be white light. Especially, the system light may have a correlated color temperature selected from the range of 1500-7000 K, such as from the range of 2000-6500 K. Additionally or alternatively, the system light may have a color rendering index of at least 75, such as at least 80. Hence, in specific embodiments, the invention provides a light generating system comprising a first light generating device, a second light generating device, a third light generating device, and a control system; wherein: (A) the first light generating device comprises a first solid state light source and a first luminescent converter; wherein the first solid state light source is configured to generate first light source light having a first peak emission wavelength (λp1) selected from the range of 380-490 nm; wherein the first luminescent converter is configured in a light receiving relationship with the first solid state light source; (B) the second light generating device comprises a second solid state light source and a second luminescent converter; wherein the second solid state light source is configured to generate second light source light having a second peak emission wavelength (λp₂) selected from the range of 380-490 nm; wherein the second luminescent converter is configured in a light receiving relationship with the second solid state light source; (C) the third light generating device comprises a third solid state light source and a third luminescent converter; wherein the third solid state light source is configured to generate third light source light having a third peak emission wavelength (λp₃) selected from the range of 380-490 nm; wherein the third luminescent converter is configured in a light receiving relationship with the third solid state light source; (D) each of the first luminescent converter, the second luminescent converter, and the third luminescent converter comprises a narrowband luminescent material; wherein the first luminescent converter and the second luminescent converter each further comprise a green-yellow luminescent material and a broadband luminescent material; (E) the green-yellow luminescent material is configured to convert at least part of respectively the first light source light and the second light source light received by the green-yellow luminescent material into green-yellow luminescent material light; wherein the green-yellow luminescent material light has a green-yellow centroid wavelength (λcg) individually selected from the range of 490-590 nm; (F) the2024PF80392

[0019] 5

[0020] broadband luminescent material is configured to convert at least part of (a) respectively the first light source light and the second light source light and / or (b) the green-yellow luminescent material light received by the broadband luminescent material into broadband luminescent material light; wherein the broadband luminescent material light has a broadband centroid wavelength (Xcb) individually selected from the range of 600-670 nm; wherein the broadband luminescent material light comprises at least one emission band having a broadband full width at half maximum FWHMb of > 60 nm; (G) the narrowband luminescent material is configured to convert at least part of respectively the first light source light, the second light source light, and the third light source light received by the narrowband luminescent material into narrowband luminescent material light; wherein the narrowband luminescent material light has a narrowband centroid wavelength (Xcn) individually selected from the range of 610-650 nm; wherein the narrowband luminescent material light comprises at least one emission band having a narrowband full width at half maximum FWHMn of < 40 nm; (H) the first light generating device is configured to generate first device light comprising at least part of the first light source light, the green-yellow luminescent material light, the broadband luminescent material light, and the narrowband luminescent material light; wherein the first device light is white light having a first correlated color temperature (CCTi); (I) the second light generating device is configured to generate second device light comprising at least part of the second light source light, the green-yellow luminescent material light, the broadband luminescent material light, and the narrowband luminescent material light; wherein the second device light is white light having a second correlated color temperature (CCT2); wherein (CCT2 - CCTi) > 500 K; wherein one or more of the following applies: (i) a relative spectral power of the broadband luminescent material light in the second device light differs from a relative spectral power of the broadband luminescent material light in the first device light, and (ii) a relative spectral power of the narrowband luminescent material light in the second device light differs from a relative spectral power of the narrowband luminescent material light in the first device light; (J) the third light generating device is configured to generate third device light comprising the narrowband luminescent material light; wherein the third device light has a third device centroid wavelength (λcd3) selected from the range of 610-650 nm; (K) the light generating system is configured to generate system light comprising one or more of the first device light, the second device light, and the third device light; and (L) the control system is configured to control, in an operational mode of the light generating system, a spectral power distribution of the system light in the wavelength range of 380-780 nm by individually controlling the2024PF80392

[0021] 6

[0022] first light generating device, the second light generating device, and the third light generating device, wherein the system light in that operational mode is white light having a correlated color temperature selected from the range of 2000-6500 K and a color rendering index of at least 80. Such a light generating system may especially facilitate adjusting the ratio between (red) broadband (BB) luminescent material light and (red) narrowband (NB) luminescent material light in the system light, by adjusting the relative intensities of the first device light, second device light, and third device light in the system light. Further, such a light generating system may facilitate that, would the narrowband luminescent material degrade and / or be thermally quenched, the control system may be configured to adjust a relative contribution of the third device light to the system light to maintain a color point and / or correlated color temperature of the system light. Especially, such a light generating system may facilitate changing the NB-red to BB-red phosphor (light) ratio in white light at constant CCT.

[0023] The light generating system may comprise the first solid state light source. Further, the second light generating device may comprise the second solid state light source. Additionally, the third light generating device may comprise the third solid state light source. The first solid state light source, second solid state light source, and third solid state light source may be individually selected from the group comprising a light emitting diode (LED), a laser diode, a superluminescent diode, and a (stacked) multi -junction light emitting diode, though other options may also be possible (see below). Further, the first solid state light source may be configured to generate first light source light having a first peak emission wavelength (λp1). Additionally, the second solid state light source may be configured to generate second light source light having a second peak emission wavelength (Zp2). Further yet, the third solid state light source may be configured to generate third light source light having a third peak emission wavelength (Zp? ). In embodiments, the first peak emission wavelength (λp₁), the second peak emission wavelength (λp₂), and the third peak emission wavelength (λp₃) may be individually selected from the range of 380-500 nm, such as from the range of 380-490 nm, especially from the range of 400-490 nm, like from the range of 430-490 nm, more especially from the range of 445-470 nm. Hence, in specific embodiments, the first peak emission wavelength (λp₁), the second peak emission wavelength (λp₂), and the third peak emission wavelength (λp₃) may be individually selected from the range of 445-470 nm. Light having such a peak emission wavelength may be indicated as “royal blue” light. Further, such a peak emission wavelength may be long enough to reduce damage to the eye, yet may be short enough to be efficiently converted into luminescent material light by a luminescent material. Hence, the first light source light, the second light2024PF80392

[0024] 7

[0025] source light, and the third light source light may be one of violet light and blue light, such as especially blue light. The term “violet light”, and similar terms, may especially relate to light having a wavelength in the range of about 380-440 nm. The term “blue light”, and similar terms, may especially relate to light having a wavelength in the range of about 440-490 nm. The term “peak emission wavelength”, and similar terms, may refer to the wavelength where the radiometric emission spectrum of the light source reaches its maximum, i.e., the peak emission wavelength may denote the wavelength at which the largest (emission intensity) value is found in a graph of the spectral power distribution. The peak emission wavelength may especially be determined at room temperature.

[0026] In embodiments, the first peak emission wavelength (λp₁) may be (roughly) equal to one or more of the second peak emission wavelength (λp₂) and the third peak emission wavelength (λp₃). Hence, in embodiments, one or more may apply of: (i) |λp1 - λp2| < 7 nm, such as |λp1 - λp2| < 5 nm, especially |λp1 - λp2| < 2 nm, including (essentially) / .pi = Xp2; and (ii) |λp1 - λp3| < 7 nm, such as |λp1 - λp3| < 5 nm, especially |λp1 - λp3| < 2 nm, including (essentially) / .pi = / .ps. Yet, in embodiments, |λp1 - λp2| > 7 nm may apply, such as |λp1 - λp2| > 10 nm, especially |λp1 - λp2| > 15 nm. Additionally or alternatively, |λp1 - λp2| < 70 nm may apply, such as |λp1 - λp2| < 60 nm, especially |λp1 - λp2| < 50 nm. Further, in embodiments, |λp1 - λp3| > 7 nm may apply, such as |λp1 - λp3| > 10 nm, especially |λp1 - λp3| > 15 nm. Additionally or alternatively, |λp1 - λp3| < 70 nm may apply, such as |λp1 - λp3| < 60 nm, especially |λp1 - λp3| < 50 nm. Further, the second peak emission wavelength (λp2) may be (roughly) equal to the third peak emission wavelength ( / .ps). Hence, in embodiments, | / .p2 - Xps| < 7 nm may apply, such as |λp2 - λp3| < 5 nm, especially |λp2 - λp3| < 2 nm, including (essentially) / .p2 = / .p.v Yet, in embodiments, |λp2 - λp3| > 7 nm may apply, such as |λp2 - λp3| > 10 nm, especially |λp2 - λp3| > 15 nm. Additionally or alternatively, |λp2 - λp3| < 70 nm may apply, such as |λp2 - λp3| < 60 nm, especially |λp2 - λp3| < 50 nm. Hence, in specific embodiments, one or more may apply of: (i) |λp1 - λp2| > 10 nm, (ii) |λp1 - λp3| > 10 nm, and (iii) |λp2 - λp3| > 10 nm. System light comprising light source lights differing in peak emission wavelengths may facilitate that the blue light component in the system light may be spread over a larger wavelength range, thereby reducing the risk of the blue light harming the eyes of a viewer. Further, spreading the blue light component over a larger wavelength range may improve the blue rendering of the system light (i.e., such system light may have improved blue color representation).

[0027] The first light generating device may further comprise a first luminescent converter, configured in a light receiving relationship with the first solid state light source.2024PF80392

[0028] 8

[0029] Similarly, the second light generating device may comprise a second luminescent converter, configured in a light receiving relationship with the second solid state light source. Further, the third light generating device may comprise a third luminescent converter, configured in a light receiving relationship with the third solid state light source. Hence, the first, second, and third luminescent converters may be configured downstream of respectively the first, second, and third solid state light source. The terms “downstream” and “upstream” relate to an arrangement of items or features relative to the propagation of the light from a light generating means (here especially the solid state light sources), wherein relative to a first position within a beam of light from the light generating means, a second position in the beam of light closer to the light generating means is “upstream”, and a third position within the beam of light further away from the light generating means is “downstream”. The (first, second, and / or third) luminescent converter may be configured in physical contact with and covering (a light escape surface of) the (respectively first, second, and / or third) solid state light source. That is, the (first, second, and / or third) luminescent converter may be configured as a coating (on the respective solid state light source). Alternatively, the (first, second, and / or third) luminescent converter may be configured as a self-supporting luminescent body. In such embodiments, the (first, second, and / or third) luminescent converter may be configured: (i) in physical contact with the (respective) solid state light source, or (ii) at a non-zero distance di from (the light escape surface of) the (respective) solid state light source. The non-zero distance di may (for each of the first luminescent converter, second luminescent converter, and third luminescent converter individually) be selected from the range of > 5 pm, such as from the range of > 10 pm, especially from the range of > 25 pm. Additionally or alternatively, the non-zero distance di may (for each of the first luminescent converter, second luminescent converter, and third luminescent converter individually) be selected from the range of < 10 cm, such as from the range of < 5 cm, especially from the range of < 1 cm. Hence, in specific embodiments, the (first, second, and / or third) luminescent converter may be physically separated from the respective solid state light source.

[0030] The first luminescent converter may comprise one or more luminescent materials. Similarly, the second luminescent converter may comprise one or more luminescent materials. Further, the third luminescent converter may comprise one or more luminescent materials. Here below, some general embodiments relating to the luminescent materials are provided. The term “luminescent material” may especially refer to a material that can convert first radiation, especially one or more of UV radiation, violet radiation, blue radiation, and green radiation, into second radiation. Herein, UV (ultraviolet) may refer to a2024PF80392

[0031] 9

[0032] wavelength selected from the range of 190-380 nm, such as 200-380 nm, though other wavelengths may also be possible. The term “green light”, and similar terms, may especially relate to light having a wavelength in the range of about 490-560 nm. The first radiation and second radiation may have different spectral power distributions, with the second radiation generally having a spectral power distribution at larger wavelengths than the first radiation (i.e. “down-conversion”). In embodiments, the “luminescent material” may especially refer to a material that can convert radiation into e.g. visible and / or infrared light. The terms “visible light” or “visible emission”, and similar terms, refer to light having one or more wavelengths in the range of about 380-780 nm. Further, IR (infrared) may especially refer to radiation having a wavelength selected from the range of 780-3000 nm, such as 780-2000 nm, e.g. a wavelength of < 1500 nm, like a wavelength of > 900 nm, though other wavelengths may be possible.

[0033] For instance, the luminescent material may be able to convert one or more of UV radiation, blue radiation, and green radiation, into visible light. Hence, upon excitation with radiation, the luminescent material may emit radiation. In general, the luminescent material will be a down converter, i.e. radiation with a smaller wavelength is converted into radiation with a larger wavelength (Xex< Xem). In embodiments, the term “luminescence” may refer to phosphorescence. In embodiments, the term “luminescence” may also refer to fluorescence. Instead of the term “luminescence”, also the term “luminescent material light” or “emission” may be applied. Hence, the terms “first radiation” and “second radiation” may refer to excitation radiation and emission (radiation), respectively. Likewise, the term “luminescent material” may in embodiments refer to phosphorescence and / or fluorescence. The term “luminescent material” may also refer to a plurality of different luminescent materials. Examples of possible luminescent materials are indicated below. Hence, the term “luminescent material” may in specific embodiments also refer to a luminescent material composition. Instead of the term “luminescent material” also the term “phosphor” may be applied. These terms are known to the person skilled in the art.

[0034] In embodiments, luminescent materials may be selected from garnets and nitrides, especially doped with trivalent cerium or divalent europium, respectively. The term “nitride” may also refer to oxynitride or nitridosilicate, etc. Alternatively or additionally, the luminescent material(s) may be selected from silicates, especially doped with divalent europium. In embodiments, the luminescent material may comprise a divalent europium comprising oxynitride luminescent material. Further, in embodiments, the luminescent material may comprise a divalent europium comprising nitride luminescent material.2024PF80392

[0035] 10

[0036] In embodiments, the luminescent material may comprise a luminescent material of the type A₃B₅O₁₂:Ce. wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc; and wherein the light source light may comprise blue light source light. Especially, A may comprise one or more of Y, Gd and Lu, such as especially one or more of Y and Lu. Especially, B may comprise one or more of Al and Ga, more especially at least Al, such as essentially entirely Al. Hence, especially suitable luminescent materials are cerium comprising garnet materials. Embodiments of garnets especially include A3B5O12garnets, wherein A comprises at least yttrium (Y) or lutetium (Lu) and wherein B comprises at least aluminum (Al). Such garnets may be doped with cerium (Ce), with praseodymium (Pr) or a combination of cerium and praseodymium; especially however with Ce. Especially, B may comprise aluminum (Al), with optionally gallium (Ga) and / or scandium (Sc) and / or indium (In) up to about 20% of B, more especially up to about 10 % of B (i.e. the B ions essentially consist of > 90 mole % of Al and < 10 mole % of one or more of Ga, Sc, and In). B may especially comprise up to about 10% gallium. In another variant, B and O may at least partly be replaced by Si and N. The element A may especially be selected from the group consisting of yttrium (Y), gadolinium (Gd), terbium (Tb) and lutetium (Lu). Further, Gd and / or Tb are especially only present up to an amount of about 20% of A. In a specific embodiment, the garnet luminescent material comprises (Y1-xLux)3B5O12:Ce, wherein 0 < x < 1. The term “: Ce”, indicates that part of the metal ions (i.e. in the garnets: part of the “A” ions) in the luminescent material is replaced by Ce. This is known to the person skilled in the art. Ce will replace A in general for not more than 10%; in general, the Ce concentration will be in the range of 0.1 to 4%, especially 0.1 to 2% (relative to A). Ce in garnets is substantially or only in the trivalent state, as is known to the person skilled in the art. In embodiments, such luminescent materials may have a suitable spectral distribution, have a relatively high efficiency, and have a relatively high thermal stability.

[0037] In specific embodiments, the luminescent material may comprise (YxiA’x2Cex3)3(AlyiB’y2)5Oi2. Here, A’ comprises one or more elements selected from the group consisting of lanthanides, and B’ comprises one or more elements selected from the group of Ga, In and Sc, wherein xl+x2+x3=l, wherein x3>0, wherein 0<x2+x3<0.2, wherein yl+y2=l, wherein 0<y2<0.2. Especially, x3 is selected from the range of 0.001-0.1. Note that in embodiments x2=0. Alternatively or additionally, in embodiments y2=0.

[0038] In embodiments, the luminescent material may comprise a luminescent material of the type A₅Si₆N₁₁:Ce3+. wherein A comprises one or more of Y, La, Gd, Tb and Lu, such as in embodiments one or more of La and Y. In embodiments, the luminescent2024PF80392

[0039] 11

[0040] material may alternatively or additionally comprise one or more of MS: Eu2+and / or M2SisN8: Eu2+and / or MAISiN.vEu2and / or Ca2AlSi3O2Ns: Eu2+, etc., wherein M comprises one or more of Ba, Sr and Ca, especially in embodiments at least Sr. Hence, in embodiments, the luminescent material may comprise one or more materials selected from the group consisting of (Ba, Sr, Ca)S: Eu, (Ba, Sr, Ca)AlSiN3: Eu and (Ba, Sr, Ca)2SisN8: Eu. In these compounds, europium (Eu) is substantially or only divalent, and replaces one or more of the indicated divalent cations, as is known to the person skilled in the art. In general, Eu will not be present in amounts larger than 10% of the cation; its presence will especially be in the range of about 0.5 to 10%, more especially in the range of about 0.5 to 5% relative to the cation(s) it replaces. The term “: Eu”, indicates that part of the metal ions (indicated by M) is replaced by Eu (in these examples by Eu2+). For instance, assuming 2% Eu in CaAlSiN3: Eu, the correct formula could be (Cao.98Euo.o2)AlSiN3.

[0041] The term “luminescent material” herein especially relates to inorganic luminescent materials. Alternatively or additionally, also other luminescent materials may be applied. For instance quantum dots and / or organic dyes may be applied and may optionally be embedded in transmissive matrices like e.g. polymers, like PMMA, or polysiloxanes, etc..

[0042] In embodiments, the luminescent material may comprise a luminescent material of the type M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z: Eux. Herein, M may comprise one or more of magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba), such as especially one or more of Ca, Sr, and Ba. Hence, M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z: Eux may especially refer to (Mg, Ca, Sr, Ba)i-xLi3-2yAli+2y-zSizO4-4y-zN4y+z: Eux. Such a luminescent material may be indicated as an SLA-type phosphor, or SLA phosphor. Luminescent materials of the type Mi-xLi3-2yAli+2y-zSizO4-4y-zN4y+z: Eux may be described in US2021171827A1, which is hereby herein incorporated by reference. In Mi-xLi3-2yAli+2y-zSizO4-4y-zN4y+z: Eux, x may be selected from the range of 0 < x < 0.1, such as from the range of 0.0005 < x < 0.08, especially from the range of 0.001 < x < 0.05. Hence, europium (Eu) may not replace more than 10% of the cation M, and may substantially or only be in the divalent state (Eu2+), as is known to the person skilled in the art. Further, in Mi-xLi3-2yAli+2y-zSizO4-4y-zN4y+z: Eux, y may be selected from the range of 0 < y < 1, such as from the range of 0 < y < 0.75, especially from the range of 0 < y < 0.6. In specific embodiments, y = 0. In M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z: Eux, z may be selected from the range of 0 < z < 0.1, such as from the range of 0 < z < 0.07, especially from the range of 0 < z < 0.05. Hence, in embodiments, in an SLA phosphor, SiN may replace A1O to a maximum of 10 mole%. In embodiments, an SLA phosphor may crystallize in a UCr4C4 type crystal structure. Hence, the luminescent material may comprise2024PF80392

[0043] 12

[0044] a luminescent material of the type M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z: Eux, wherein M comprises one or more of Ca, Sr, and Ba, wherein 0 < x < 0.04, wherein 0 < y < 1, wherein 0 < z < 0.05, and wherein y + z < 1.

[0045] In embodiments, part of the Al in the SLA phosphor may be replaced by gallium (Ga). Hence, the luminescent material may comprise a luminescent material of the type Mi-xLi3-2y(Ali-bGab)i+2y-zSizO4-4y-zN4y+z: Eux, wherein M may comprise one or more of Mg, Ca, Sr, and Ba, and x, y, and z may be as indicated above. Such a luminescent material may be indicated as an SLGA phosphor, especially in embodiments wherein b > 0. In embodiments, b in the formula Mi-xLi3-2y(Ali-bGab)i+2y-zSizO4-4y-zN4y+z: Eux may be selected from the range of > 0, such as from the range of > 0.05, especially from the range of > 0.1, like from the range of > 0.15. Additionally or alternatively, b may be selected from the range of < 0.6, such as from the range of < 0.5, especially from the range of < 0.4, like from the range of < 0.3. Especially, 0 < b < 0.6 may apply, such as 0.05 < b < 0.5, especially 0.1 < b < 0.3, like 0.15 < b < 0.3.

[0046] Further, the luminescent material may comprise a (divalent europium comprising) SiAlON phosphor, such as selected from the group comprising (a) Sii2-m-nAlm+nOnNi6-n: Eu2+(a-Si AION). (b) Si6-nAlnOnN8-n: Eu2+, wherein 0 < n < 4.2 (P-SiAlON), and (c) Si2-nAlnOi+nN2-n: Eu2+, wherein 0 < n < 0.2 (O-SiAlON).

[0047] In embodiments, the luminescent material may comprise a tetravalent manganese-comprising luminescent material, i.e., a luminescent material doped with tetravalent manganese. Especially, in embodiments, the luminescent material may comprise a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises an alkaline cation, and x may be selected from the range of 0-1, wherein A comprises a tetravalent cation, for instance comprising one or more of silicon and titanium, and wherein X comprises a monovalent anion, at least comprising fluorine. Such luminescent materials may herein also be indicated as “KSiF” or “KSF”, regardless of the composition of M’, M, A, and X. A luminescent material of the type M’XM2-2XAX6 doped with tetraval ent manganese is amongst others described in WO2013121355A1, which is herein incorporated by reference. Passages from WO2013121355A1 are also copied herein. In embodiments, the alkaline earth cation M’ may comprise one or more of magnesium (Mg), strontium (Sr), calcium (Ca) and barium (Ba), especially one or more of Sr and Ba. Further, the alkaline cations M may comprise one or more of sodium (Na), potassium (K) and rubidium (Rb). Optionally, M may (further) comprise one or more of ammonium (NH4+), lithium (Li), and cesium (Cs). In a preferred2024PF80392

[0048] 13

[0049] embodiment, M comprises at least potassium. In yet another embodiment, M comprises at least rubidium. The phrase “wherein M comprises at least potassium” indicates for instance that of all M cations in a mole M’xM2-2xAX6, a fraction comprises K+and an optionally remaining fraction comprises one or more other monovalent (alkaline) cations (see also below). In another preferred embodiment, M comprises at least potassium and rubidium. Optionally, the M’xM2-2xAXe luminescent material has the hexagonal phase. In yet another embodiment, the M’xM2-2xAXe luminescent material has the cubic phase. In an embodiment, a combination of different alkaline cations M may be applied. In yet another embodiment, a combination of different alkaline earth cations M’ may be applied. In yet another embodiment, a combination of one or more alkaline cations M and one or more alkaline earth cations M’ may be applied. For instance, KRbo.5Sro.25AX6 might be applied. As indicated above, x in the formula M’xM2-2xAX6 may be selected from the range of 0-1, especially x < 1. In specific embodiments, x = 0.

[0050] The term “tetravalent manganese” refers to Mn4+. This is a well-known luminescent ion. In the formula as indicated above, part of the tetravalent cation A (such as Si) is being replaced by manganese. Hence, M’xM2-2xAX6 doped with tetravalent manganese may also be indicated as M’xM2-2xAi-mMnmX6 (or M’xM2-2xAX6: Mn4+). The mole percentage of manganese, i.e. the percentage it replaces the tetraval ent cation A will in general be in the range of 0.1-15 %, especially 1-12 %, i.e. m is in the range of 0.001-0.15, especially in the range of 0.01-0.12. As manganese replaces part of a host lattice ion and has a specific function, it is also indicated as “dopant” or “activator”. Hence, the hexafluorosilicate is doped or activated with manganese (Mn4+).

[0051] In embodiments, A may comprise a tetravalent cation, and preferably at least comprises silicon. A may optionally (further) comprise one or more of titanium (Ti), germanium (Ge), tin (stannum) (Sn) and zinc (Zn). Further, A may comprise one or more of zirconium (Zr), and hafnium (Hl). Preferably, at least 80%, even more preferably at least 90%, such as at least 95% of A consists of silicon. In a specific embodiment, M’xM2-2xAX6 can also be described as (Ki-r-i-n-c-nh RbrLiiNanCsc(NH4)nh)2AX6, wherein r is in the range of 0-1, wherein l,n,c,nh are each individually preferably in the range of 0-1, preferably in the range of 0-0.2, especially in the range of 0-0.1, even more especially in the range of 0-0.05, and wherein r+l+n+c+nh is in the range of 0-1, especially 1+n+c+nh < 1, especially < 0.2, preferably in the range of 0-0.2, especially in the range of 0-0.1, even more especially in the range of 0-0.05. X is preferably fluorine (F). Further, in a specific embodiment, M’xM2-2xAX6 can also be described as MgmgCacaSrSrBaba(KkRbrLiiNanCsc(NH4)nh)2AX6, with k, r, 1, n, c, nh2024PF80392

[0052] 14

[0053] each individually being in the range of 0-1, wherein mg, ca, sr, ba are each individually in the range of 0-1, and wherein mg+ca+sr+ba+k+ r+ l+n+c+nh=l. In embodiments, k=l, and the others (mg, ca, sr, ba, r, 1, n, c, nh) are zero.

[0054] As indicated above, X relates to a monovalent anion, but at least comprises fluorine. Other monovalent anions that may optionally be present may be selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I). Preferably, at least 80%, even more preferably at least 90%, such as 95% of X consists of fluorine. Hence, in a specific embodiment, M’xM2-2xAXe can also be described as M’xM2-2xA(Fi-ci-b-iCldBrbIi)6, wherein cl,b,i are each individually preferably in the range of 0-0.2, especially in the range of 0-0.1, even more especially in the range of 0-0.05, and wherein cl+b+i < 1, especially < 0.2, preferably in the range of 0-0.2, especially in the range of 0-0.1, even more especially in the range of 0-0.05. Hence, M’xM2-2xAXe can also be described as (Ki-r-i-n-c-nh RbrLiiNanCsc(NH4)nh)2Sii-m-t-g-s-zrMnmTitGegSnsZrzr(Fi-ci-b-iClciBrbIi)6, with the values for r,l,n,c,nh,m,t,g,s,zr,cl,b,i as indicated above.

[0055] In an embodiment, M’xM2-2xAXe comprises BGSiFe (indicated herein also as KSiF system). In another preferred embodiment, M’xM2-2xAXe comprises KRbSiFe (herein also indicated as K, Rb system). In specific embodiments, the indication M’xM2-2xAXe may refer to one or more of (K, Rb)2SiFe: Mn4+, (K, Rb)2TiFe: Mn4+, K2(Si, Ti)Fe: Mn4+, and Rb2(Si, Ti)Fe: Mn4+, such as one or more of K2TiFe: Mn4+, of K2SiFe: Mn4+, and of Rb2SiF6: Mn4+. As can be derived from the above, “(Si, Ti)” may indicate one or more of Si and Ti. Hence, in specific embodiments, the luminescent material may comprise one or more of (K, Rb)2SiFe: Mn4+and K2(Si, Ti)Fe: Mn4+. The luminescent material may also be coated, as also described in WO2013121355A1.

[0056] Hence, when M (or A) in chemical formulas refer to n different elements, this may imply that the relevant formula may comprise for the M (or A) position in the formula essentially any permutation of the n different elements. For instance, when M=Ba, Sr, Ca, or when M comprises one or more of Ba, Sr, Ca, i.e. n=3, this may imply that in the formula Ba, Sr, Ca, (BaxSry), (BaxCay), (CaxSry), or (BaxSryCaz), may be available, wherein in general x+y+z=l. Referring to e.g. M’xM2-2xAXe, this may refer to e.g. one or more of K2SiFe: Mn4+and of Rb2SiF6: Mn4+, or (KxRby)2SiF6: Mn4+, etc. Referring to (Ba, Sr, Ca)AlSiN3: Eu, this may imply BaAlSiN3: Eu, SrAlSiN3: Eu, CaAlSiN3: Eu, (BaxSry)AlSiN3: Eu, (BaxCay)AlSiN3: Eu, (CaxSry)AlSiN3: Eu, or (BaxSryCaz)AlSiN3: Eu. Referring to e.g. AsBsOnX'e. wherein A in embodiments comprises one or more of Y, La, Gd, Tb and Lu, this may imply YsBsOnX'e. La3BsOi2: Ce, GdBsOi2: Ce, TbsBsOnX'e. Lu3BsOi2: Ce, but also e.g. (Yx, Gdy)3BsOi2: Ce,2024PF80392

[0057] 15

[0058] (Yx, Luy)3BsOi2: Ce, (Gdx, Luy)3BsOi2: Ce, (¥x, Gdy, Luz)3BsOi2: Ce, etc. etc., with hereby only limiting for the sake of economy to unary, binary, and ternary examples, though quaternary and higher examples are not excluded herein. Further, indications like “K, Rb” or Ba, Sr, Ca, and similar indications (see also above), may indicate one or more of such elements. Hence, (K, Rb)2SiFe: Mn4+, may e.g. refer to K2SiFe: Mn4+and of Rb2SiFe: Mn4+, or (KxRby)2SiF6: Mn4+. Also herein in general x+y=l. Hence, when M (or A) may refer to n different elements, with n being at least two, 2n-l permutations may in principle be possible.

[0059] In embodiments, each of the first luminescent converter, the second luminescent converter, and the third luminescent converter may comprise a narrowband luminescent material. The narrowband luminescent material may (for each of the first luminescent converter, second luminescent converter, and third luminescent converter individually) be selected from the luminescent materials provided above. Yet, in embodiments, (one or more of, such as especially) each of the narrowband luminescent materials (of the first luminescent converter, second luminescent converter, and third luminescent converter) may comprise a luminescent material of the type M’xM2-2xAXe: Mn4+(or “M’XM2-2XAX6 doped with tetravalent manganese”). In such embodiments, M’ may comprise an alkaline earth cation, M may comprise a monovalent cation (such as especially an alkaline cation), and x may be in the range of 0-1. Further, in such embodiments, A may comprise a tetravalent cation, comprising one or more of silicon, titanium, germanium, tin, zinc, zirconium, and hafnium. Additionally, X may comprise a monovalent anion, at least comprising fluorine. Hence, in specific embodiments, each of the narrowband luminescent materials may comprise a luminescent material of the type M’xM2-2xAXe: Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetraval ent cation, comprising one or more of silicon, titanium, germanium, tin, zinc, zirconium, and hafnium, and wherein X comprises a monovalent anion, at least comprising fluorine. Such a luminescent material may be configured to convert light source light into luminescent material light relatively efficiently. Further, such a luminescent material may provide narrowband emission in especially the red wavelength range.

[0060] The narrowband luminescent material (of one or more of the first luminescent converter, second luminescent converter, and third luminescent converter) may comprise one or more further (types of) luminescent materials, such as selected from the (types of) luminescent materials provided above. Additionally or alternatively, the narrowband luminescent material (of one or more of the first luminescent converter, second luminescent converter, and third luminescent converter) may comprise one or more luminescent materials2024PF80392

[0061] 16

[0062] of the type M\M2-2xAXe: Mn4+, wherein the one or more luminescent materials of the type M’xM2-2xAXe: Mn4+may differ in the composition of M and / or the composition of A.

[0063] Especially, the narrowband luminescent material (of one or more, such as especially each, of the first luminescent converter, second luminescent converter, and third luminescent converter) may consist for at least 80 wt.%, such as at least 85 wt.%, especially at least 90 wt.%, like at least 95 wt.%, including (essentially) 100 wt.%, of luminescent materials of the type M’xM2-2xAX6: Mn4+.

[0064] As indicated above, M (in the formula M’xM2-2xAXe: Mn4+) may comprise an alkaline cation. Especially, M may comprise one or more of K, Na, and Rb. Further, A (in the formula M'xM2-2xAXe: Mn4) may comprise one or more of Si and Ti, such as at least Si, or such as at least Ti. Hence, in embodiments, the narrowband luminescent material may comprise (K, Na, Rb)2(Si, Ti)Fe: Mn4+.

[0065] The narrowband luminescent material may be configured to convert at least part of respectively the first light source light, the second light source light, and the third light source light received by the narrowband luminescent material into narrowband luminescent material light. Further, the narrowband luminescent material may be configured to convert at least part of respectively the first light source light, the second light source light, and the third light source light received by respectively the first luminescent converter, the second luminescent converter, and the third luminescent converter into narrowband luminescent material light. Especially, the narrowband luminescent material may be configured to convert at least 15%, such as at least 20%, especially at least 25%, of respectively the first light source light, the second light source light, and the third light source light received by respectively the first luminescent converter, the second luminescent converter, and the third luminescent converter into narrowband luminescent material light. Additionally or alternatively, the narrowband luminescent material may be configured to convert at most 70%, such as at most 65%, especially at most 60%, of respectively the first light source light, the second light source light, and the third light source light received by respectively the first luminescent converter, the second luminescent converter, and the third luminescent converter into narrowband luminescent material light. Yet, the narrowband luminescent material may be configured to convert > 80%, such as > 90%, especially > 95%, like > 98%, including (essentially) 100%, of the third light source light received by the third luminescent converter into narrowband luminescent material light.

[0066] Further, the narrowband luminescent material may be configured to convert at least part of the green-yellow luminescent material light received by the narrowband2024PF80392

[0067] 17

[0068] luminescent material into narrowband luminescent material light. Yet, especially, the narrowband luminescent material may be configured to convert < 10%, such as < 7%, especially < 5%, like < 2%, including (essentially) 0%, of the green-yellow luminescent material light received by the narrowband luminescent material into narrowband luminescent material light.

[0069] The narrowband luminescent material light may have a narrowband centroid wavelength (λcn). The term “centroid wavelength”, also indicated as Zc. is known in the art, and refers to the wavelength value (in nm) where half of the light energy is at shorter and half the energy is at longer wavelengths. It is the wavelength that divides the integral of a spectral power distribution into two equal parts as expressed by the formula Zc = X Z*I(Z) / (X I( Z)). where the summation is over the wavelength range of interest, and I(X) is the spectral energy density (i.e. the integration of the product of the wavelength and the intensity over the emission band normalized to the integrated intensity). The centroid wavelength may e.g. be determined at operation conditions. In embodiments, the narrowband centroid wavelength (Xcn) may be individually selected (for each of the first light generating device, the second light generating device, and the third light generating device) from the range of 600-660 nm, such as from the range of 610-650 nm, especially from the range of 620-640 nm, like from the range of 625-635 nm. Hence, in embodiments, the narrowband luminescent material light may comprise, such as be, one or more of orange light and red light, such as especially red light. The terms “orange light” or “orange emission”, and similar terms, may especially relate to light having a wavelength in the range of about 590-620 nm. The terms “red light” or “red emission”, and similar terms, may especially relate to light having a wavelength in the range of about 620-780 nm.

[0070] Further, the narrowband luminescent material light may comprise at least one emission band having a narrowband full width at half maximum FWHMn of < 50 nm, such as < 40 nm, especially < 35 nm, like < 25 nm. Additionally or alternatively, the narrowband luminescent material light may comprise the at least one emission band having the narrowband full width at half maximum FWHMn of > 2 nm, such as > 5 nm, especially > 7 nm. In embodiments, the narrowband luminescent material light may comprise a plurality of emission bands, wherein at least one band may have the narrowband full width at half maximum FWHMn. Additionally or alternatively, the narrowband luminescent material light may comprise a plurality of emission bands, wherein essentially all of the emission bands may have the narrowband full width at half maximum FWHMn. The term “emission band” may refer to the emission (spectral power distribution) resulting from a radiative transition of2024PF80392

[0071] 18

[0072] electrons from (vibrational levels ol) a first higher-energy excited state to (vibrational levels of) a second lower-energy (ground) state, wherein a larger number of vibrational levels in (one or more ol) the first excited state and second (ground) state results in a broader emission band (spanning a larger wavelength range). Further, the term “full width at half maximum” (or “FWHM”) refers to the width of (the spectral power distribution ol) the emission band at half the maximum intensity of said emission band. The FWHM of an emission band may especially be determined at room temperature.

[0073] As indicated above, each of the first luminescent converter, the second luminescent converter, and the third luminescent converter may comprise a narrowband luminescent material (as described above). Especially, the first luminescent converter may comprise a first narrowband luminescent material (configured to convert at least part of the first light source light received by the first narrowband luminescent material into first narrowband luminescent material light). The first narrowband luminescent material light may especially have a first narrowband centroid wavelength (λcn1) (selected from the range provided above for Xcn), and comprise at least one emission band having a first narrowband full width at half maximum FWHMni (selected from the range provided above for FWHMn). Further, the second luminescent converter may comprise a second narrowband luminescent material (configured to convert at least part of the second light source light received by the second narrowband luminescent material into second narrowband luminescent material light). The second narrowband luminescent material light may especially have a second narrowband centroid wavelength (Zcn2) (selected from the range provided above for Xcn), and comprise at least one emission band having a second narrowband full width at half maximum FWHMni (selected from the range provided above for FWHMn). Further, the third luminescent converter may comprise a third narrowband luminescent material (configured to convert at least part of the third light source light received by the third narrowband luminescent material into third narrowband luminescent material light). The third narrowband luminescent material light may especially have a third narrowband centroid wavelength (Zcn3) (selected from the range provided above for Xcn), and comprise at least one emission band having a third narrowband full width at half maximum FWHMn? (selected from the range provided above for FWHMn). As indicated above, the first narrowband luminescent material, second narrowband luminescent material, and third narrowband luminescent material may be individually selected from the luminescent materials provided above. Yet, especially, the first narrowband luminescent material, the second narrowband luminescent material, and the third narrowband luminescent material may be of the same type (such as especially of the type2024PF80392

[0074] 19

[0075] M’xM2-2xAX6: Mn4+). Further, in embodiments, the first narrowband luminescent material, the second narrowband luminescent material, and the third narrowband luminescent material may have the same atomic composition (i.e., the first narrowband luminescent material, the second narrowband luminescent material, and the third narrowband luminescent material may be identical). Alternatively, the first narrowband luminescent material, the second narrowband luminescent material, and the third narrowband luminescent material may all be of the type M’xM2-2xAXe: Mn4+, wherein the first narrowband luminescent material, the second narrowband luminescent material, and the third narrowband luminescent material may differ in the atomic composition (e.g. in one or more of a composition of M, a composition of A, and a concentration of Mn4+).

[0076] Further, in embodiments, each of the first luminescent converter and the second luminescent converter may comprise a broadband luminescent material. The broadband luminescent material may (for each of the first luminescent converter and the second luminescent converter individually) be selected from the luminescent materials provided above. Yet, in embodiments, (one or more of, such as especially) each of the broadband luminescent materials (of the first luminescent converter and the second luminescent converter) may comprise a luminescent material selected from the group of divalent europium comprising oxynitride luminescent materials and divalent europium comprising nitride luminescent materials. Additionally or alternatively, each of the broadband luminescent materials (of the first luminescent converter and the second luminescent converter) may comprise a (divalent europium comprising) SiAlON phosphor (see also above). Yet, additionally or alternatively each of the broadband luminescent materials (of the first luminescent converter and the second luminescent converter) may comprise a luminescent material of the type Mi-xLi3-2yAli+2y-zSizO4-4y-zN4y+z: Eux, wherein M comprises one or more of Mg, Ca, Sr, and Ba, wherein 0 < x < 0.1, wherein 0 < y < 1, and wherein 0 < z < 0.1. Further, each of the broadband luminescent materials (of the first luminescent converter and the second luminescent converter) may comprise a luminescent material of the type Mi-xLi3-2y(Ali-bGab)i+2y-zSizO4-4y-zN4y+z: Eux, wherein M comprises one or more of Mg, Ca, Sr, and Ba, wherein 0 < x < 0.1, wherein 0 < y < 1, wherein 0 < z < 0.1, and wherein 0 < b < 0.6. Hence, in specific embodiments, each of the broadband luminescent materials may comprise a luminescent material selected from the group of divalent europium comprising oxynitride luminescent materials, divalent europium comprising nitride luminescent materials, SiAlON phosphors, and luminescent materials of the type

[0077] Mi-xLi3-2yAli+2y-zSizO4-4y-zN4y+z: Eux, wherein M comprises one or more of Mg, Ca, Sr, and2024PF80392

[0078] 20

[0079] Ba, wherein 0 < x < 0.1, wherein 0 < y < 1, and wherein 0 < z < 0.1. Such a broadband luminescent material may especially be configured to provide broadband emission in the red wavelength range. Further, such a broadband luminescent material may be relatively thermally and / or chemically stable.

[0080] The broadband luminescent material (of one or more of the first luminescent converter and the second luminescent converter) may comprise one or more further (types of) luminescent materials, such as selected from the (types of) luminescent materials provided above. Yet, especially, the broadband luminescent material (of one or more of the first luminescent converter and the second luminescent converter) may consist for at least 80 wt.%, such as at least 85 wt.%, especially at least 90 wt.%, like at least 95 wt.%, including (essentially) 100 wt.%, of one or more luminescent materials selected from the group of divalent europium comprising oxynitride luminescent materials, divalent europium comprising nitride luminescent materials, (divalent europium comprising) SiAlON phosphors, and luminescent materials of the type Mi-xLi3-2yAli+2y-zSizO4-4y-zN4y+z: Eux, wherein M comprises one or more of Mg, Ca, Sr, and Ba, wherein 0 < x < 0.1, wherein 0 <y < 1, and wherein 0 < z < 0.1.

[0081] The broadband luminescent material may be configured to convert at least part of respectively the first light source light and the second light source light received by the broadband luminescent material into broadband luminescent material light. Further, the broadband luminescent material may be configured to convert at least part of respectively the first light source light and the second light source light received by respectively the first luminescent converter and the second luminescent converter into broadband luminescent material light. Especially, the broadband luminescent material may be configured to convert at least 5%, such as at least 10%, especially at least 15%, of respectively the first light source light and the second light source light received by respectively the first luminescent converter and the second luminescent converter into broadband luminescent material light.

[0082] Additionally or alternatively, the broadband luminescent material may be configured to convert at most 45%, such as at most 40%, especially at most 35%, of respectively the first light source light and the second light source light received by respectively the first luminescent converter and the second luminescent converter into broadband luminescent material light.

[0083] Additionally or alternatively, the broadband luminescent material may be configured to convert at least part of the green-yellow luminescent material light received by the broadband luminescent material into broadband luminescent material light. Especially,2024PF80392

[0084] 21

[0085] the broadband luminescent material may be configured to convert at least 5%, such as at least 10%, especially at least 15%, of the green-yellow luminescent material light received by the broadband luminescent material into broadband luminescent material light. Additionally or alternatively, the broadband luminescent material may be configured to convert at most 45%, such as at most 40%, especially at most 35%, of the green-yellow luminescent material light received by the broadband luminescent material into broadband luminescent material light. Yet, in embodiments, the broadband luminescent material may be configured to convert at most 5%, such as at most 2%, especially at most 1%, including (essentially) 0%, of the greenyellow luminescent material light received by the broadband luminescent material into broadband luminescent material light.

[0086] The broadband luminescent material light may have a broadband centroid wavelength (λcb). In embodiments, the broadband centroid wavelength (λcb) may be individually selected (for each of the first light generating device and the second light generating device) from the range of 590-680 nm, such as from the range of 600-670 nm, especially from the range of 600-660 nm, like from the range of 610-650 nm. Hence, in embodiments, the broadband luminescent material light may comprise, such as be, one or more of orange light and red light, such as especially red light. The broadband centroid wavelength (λcb) may be (roughly) equal to the narrowband centroid wavelength (λcn).

[0087] Especially, in embodiments, |λcb-λcn| ≤ 10 nm (may apply), such as |λcb-λcn| ≤ 5 nm, especially |λcb-λcn| ≤ 2 nm. Yet, in embodiments, |λcb-λcn| ≥ 10 nm (may apply), such as |λcb-λcn| ≥ 15 nm, especially |λcb-λcn| ≥ 20 nm. Additionally or alternatively, in embodiments, |λcb-λcn| ≤ 80 nm (may apply), such as |λcb-λcn| ≤ 60 nm, especially |λcb-λcn| ≤ 40 nm.

[0088] Further, the broadband luminescent material light may comprise at least one emission band having a broadband full width at half maximum FWHMb of > 50 nm, such as > 60 nm, especially > 70 nm, like > 80 nm. Additionally or alternatively, the broadband luminescent material light may comprise the at least one emission band having the broadband full width at half maximum FWHMb of < 200 nm, such as < 175 nm, especially < 150 nm. In embodiments, the broadband luminescent material light may comprise a plurality of emission bands, wherein at least one band may have the broadband full width at half maximum FWHMb. Additionally or alternatively, the broadband luminescent material light may comprise a single emission band, wherein said emission band may have the broadband full width at half maximum FWHMb.

[0089] As indicated above, each of the first luminescent converter and the second luminescent converter may comprise a broadband luminescent material (as described above).2024PF80392

[0090] 22

[0091] Especially, the first luminescent converter may comprise a first broadband luminescent material (configured to convert at least part of the first light source light received by the first broadband luminescent material into first broadband luminescent material light). The first broadband luminescent material light may especially have a first broadband centroid wavelength (λcb1) (selected from the range provided above for λcb), and comprise at least one emission band having a first broadband full width at half maximum FWHMbi (selected from the range provided above for FWHMb). Further, the second luminescent converter may comprise a second broadband luminescent material (configured to convert at least part of the second light source light received by the second broadband luminescent material into second broadband luminescent material light). The second broadband luminescent material light may especially have a second broadband centroid wavelength (λcb2) (selected from the range provided above for λcb), and comprise at least one emission band having a second broadband full width at half maximum FWHMb2 (selected from the range provided above for FWHMb). As indicated above, the first broadband luminescent material and second broadband luminescent material may be individually selected from the luminescent materials provided above. Yet, especially, the first broadband luminescent material and the second broadband luminescent material may be of the same type (such as selected from the group of divalent europium comprising oxynitride luminescent materials, divalent europium comprising nitride luminescent materials, (divalent europium comprising) SiAlON phosphors, and luminescent materials of the type M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z:Eux, wherein M comprises one or more of Mg, Ca, Sr, and Ba, wherein 0 < x < 0.1, wherein 0 < y < 1, and wherein 0 < z < 0.1). Further, in embodiments, the first broadband luminescent material and the second broadband luminescent material may have the same atomic composition (i.e., the first broadband luminescent material and the second broadband luminescent material may be identical). Alternatively, the first broadband luminescent material and the second broadband luminescent material may be of the same type, wherein the first broadband luminescent material and the second broadband luminescent material may differ in atomic composition.

[0092] Further, in embodiments, each of the first luminescent converter and the second luminescent converter may comprise a green-yellow luminescent material. The greenyellow luminescent material may (for each of the first luminescent converter and the second luminescent converter individually) be selected from the luminescent materials provided above. Yet, in embodiments, (one or more of, such as especially) each of the green-yellow luminescent materials (of the first luminescent converter and the second luminescent converter) may comprise a luminescent material of the type A3B5O12:Ce, wherein A2024PF80392

[0093] 23

[0094] comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc. Especially, B may at least comprise Al and / or A may comprise (at least) one or more of Y and Lu. Hence, in specific embodiments, each of the green-yellow luminescent materials may comprise a luminescent material of the type A3B5O12:Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc. Such a green-yellow luminescent material may especially be configured to provide (broadband) emission in the green-yellow wavelength range. Further, such a green-yellow luminescent material may be relatively thermally and / or chemically stable.

[0095] The green-yellow luminescent material (of one or more of the first luminescent converter and the second luminescent converter) may comprise one or more further (types of) luminescent materials, such as selected from the (types of) luminescent materials provided above. Yet, especially, the green-yellow luminescent material (of one or more of the first luminescent converter and the second luminescent converter) may consist for at least 80 wt.%, such as at least 85 wt.%, especially at least 90 wt.%, like at least 95 wt.%, including (essentially) 100 wt.%, of a luminescent material of the type A3B5O12:Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc.

[0096] The green-yellow luminescent material may be configured to convert at least part of respectively the first light source light and the second light source light received by the green-yellow luminescent material into green-yellow luminescent material light. Further, the green-yellow luminescent material may be configured to convert at least part of respectively the first light source light and the second light source light received by respectively the first luminescent converter and the second luminescent converter into greenyellow luminescent material light. Especially, the green-yellow luminescent material may be configured to convert at least 5%, such as at least 10%, especially at least 15%, of respectively the first light source light and the second light source light received by respectively the first luminescent converter and the second luminescent converter into greenyellow luminescent material light. Additionally or alternatively, the green-yellow luminescent material may be configured to convert at most 75%, such as at most 70%, especially at most 65%, of respectively the first light source light and the second light source light received by respectively the first luminescent converter and the second luminescent converter into green-yellow luminescent material light.

[0097] The green-yellow luminescent material light may have a green-yellow centroid wavelength (λcg). In embodiments, the green-yellow centroid wavelength (λcg) may be2024PF80392

[0098] 24

[0099] individually selected (for each of the first light generating device and the second light generating device) from the range of 480-600 nm, such as from the range of 490-590 nm, especially from the range of 500-580 nm, like from the range of 500-570 nm. Hence, in embodiments, the green-yellow luminescent material light may comprise, such as be, one or more of green light and yellow light, such as especially green light. The term “yellow light”, and similar terms, may especially relate to light having a wavelength in the range of about 560-590 nm. The green-yellow centroid wavelength (Zcg) may be smaller than the narrowband centroid wavelength (λcn). Especially, in embodiments, Zcn- / .cg> 20 nm (may apply), such as Zcn- / .cg> 30 nm, especially Zcn- / .cg> 40 nm. Additionally or alternatively, in embodiments, Zcn- / .cg< 160 nm (may apply), such as Zcn- / .cg< 140 nm, especially Zcn- / .cg< 120 nm. Further, the green-yellow centroid wavelength (Zcg) may be smaller than the broadband centroid wavelength (λcb). Especially, in embodiments, Zcb- / .cg> 20 nm (may apply), such as Zcb- / .cg> 30 nm, especially Zcb- / .cg> 40 nm. Additionally or alternatively, in embodiments, Zcb-Zcg< 160 nm (may apply), such as Zcb-Zcg< 140 nm, especially Zcb-Zcg< 120 nm.

[0100] Further, the green-yellow luminescent material light may comprise at least one emission band having a green-yellow full width at half maximum FWHMgof > 40 nm, such as > 50 nm, especially > 60 nm, like > 70 nm. Additionally or alternatively, the green-yellow luminescent material light may comprise the at least one emission band having the greenyellow full width at half maximum FWHMgof < 200 nm, such as < 175 nm, especially < 150 nm. In embodiments, the green-yellow luminescent material light may comprise a plurality of emission bands, wherein at least one band may have the green-yellow full width at half maximum FWHMg. Additionally or alternatively, the green-yellow luminescent material light may comprise a single emission band, wherein said emission band may have the greenyellow full width at half maximum FWHMg.

[0101] As indicated above, each of the first luminescent converter and the second luminescent converter may comprise a green-yellow luminescent material (as described above). Especially, the first luminescent converter may comprise a first green-yellow luminescent material (configured to convert at least part of the first light source light received by the first green-yellow luminescent material into first green-yellow luminescent material light). The first green-yellow luminescent material light may especially have a first greenyellow centroid wavelength (Xcgi) (selected from the range provided above for λcg), and comprise at least one emission band having a first green-yellow full width at half maximum FWHMgi(selected from the range provided above for FWHMg). Further, the second2024PF80392

[0102] 25

[0103] luminescent converter may comprise a second green-yellow luminescent material (configured to convert at least part of the second light source light received by the second green-yellow luminescent material into second green-yellow luminescent material light). The second green-yellow luminescent material light may especially have a second green-yellow centroid wavelength (λcg2) (selected from the range provided above for λcg), and comprise at least one emission band having a second green-yellow full width at half maximum FWHMg2 (selected from the range provided above for FWHMg). As indicated above, the first green-yellow luminescent material and second green-yellow luminescent material may be individually selected from the luminescent materials provided above. Yet, especially, the first greenyellow luminescent material and the second green-yellow luminescent material may be of the same type (such as especially of the type A3B5O12:Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc). Further, in embodiments, the first green-yellow luminescent material and the second green-yellow luminescent material may have the same atomic composition (i.e., the first green-yellow luminescent material and the second green-yellow luminescent material may be identical). Alternatively, the first green-yellow luminescent material and the second green-yellow luminescent material may be of the type A3B5O12:Ce, wherein the first green-yellow luminescent material and the second green-yellow luminescent material may differ in atomic composition (such as one or more of a composition of A, a composition of B, and a concentration of Ce, wherein A and B may refer to one or more atoms (see above)). For instance, the first green-yellow luminescent material may comprise Y2LuB5O12:Ce, and the second green-yellow luminescent material may comprise YLu2B5O12:Ce, wherein the first and second green-yellow luminescent materials thus differ in atomic composition.

[0104] Hence, in specific embodiments, (A) the first luminescent converter may comprise a first green-yellow luminescent material, a first broadband luminescent material, and a first narrowband luminescent material; (B) the second luminescent converter may comprise a second green-yellow luminescent material, a second broadband luminescent material, and a second narrowband luminescent material; (C) the third luminescent converter may comprise a third narrowband luminescent material; and (D) one or more of the following may apply: (i) the first green-yellow luminescent material and the second green-yellow luminescent material may be of the same type; (ii) the first broadband luminescent material and the second broadband luminescent material may be of the same type; and (iii) the first narrowband luminescent material, the second narrowband luminescent material, and the third narrowband luminescent material may be of the same type. Selecting one or more of the2024PF80392

[0105] 26

[0106] narrowband luminescent materials, broadband luminescent materials, and green-yellow luminescent materials in the (applicable) luminescent converters to be of the same type may facilitate that the emission peaks in the spectral power distributions of the (combined) luminescent material light of the different luminescent converters may be (roughly) located at the same wavelengths, yet may differ in relative intensities. Hence, this may facilitate that the relative intensities of the narrowband, broadband, and green-yellow luminescent material light in the system light may be adjusted, while the location of the emission peaks in a spectral power distribution of the system light may (essentially) not change.

[0107] Hence, in specific embodiments, the invention may provide a light generating system comprising a first light generating device, a second light generating device, a third light generating device, and a control system; wherein: (A) the first light generating device may comprise a first solid state light source and a first luminescent converter; wherein the first solid state light source may be configured to generate first light source light having a first peak wavelength (λp1) selected from the range of 380-490 nm; wherein the first luminescent converter may be configured in a light receiving relationship with the first solid state light source; wherein the first luminescent converter may comprise a first green-yellow luminescent material, a first broadband luminescent material, and a first narrowband luminescent material; (B) the first green-yellow luminescent material may be configured to convert at least part of the first light source light received by the first green-yellow luminescent material into first green-yellow luminescent material light; wherein the first green-yellow luminescent material light may have a first green-yellow centroid wavelength (λcg1) selected from the range of 490-590 nm; (C) the first broadband luminescent material may be configured to convert at least part of the first light source light received by the first broadband luminescent material into first broadband luminescent material light; wherein the first broadband luminescent material light may have a first broadband centroid wavelength (λcb1) selected from the range of 600-660 nm; wherein the first broadband luminescent material light may comprise at least one emission band having a first broadband full width at half maximum FWHMbi of > 60 nm; (D) the first narrowband luminescent material may be configured to convert at least part of the first light source light received by the first narrowband luminescent material into first narrowband luminescent material light; wherein the first narrowband luminescent material light may have a first narrowband centroid wavelength (λcn1) selected from the range of 610-650 nm; wherein the first narrowband luminescent material light may comprise at least one emission band having a first narrowband full width at half maximum FWHMni of < 40 nm; (E) the first light generating2024PF80392

[0108] 27

[0109] device may be configured to generate first device light comprising at least part of the first light source light, the first green-yellow luminescent material light, the first broadband luminescent material light, and the first narrowband luminescent material light; wherein the first device light may be white light having a first correlated color temperature (CCTi); (F) the second light generating device may comprise a second solid state light source and a second luminescent converter; wherein the second solid state light source may be configured to generate second light source light having a second peak wavelength (λp2) selected from the range of 380-490 nm; wherein the second luminescent converter may be configured in a light receiving relationship with the second solid state light source; wherein the second luminescent converter may comprise a second green-yellow luminescent material, a second broadband luminescent material, and a second narrowband luminescent material; (G) the second green-yellow luminescent material may be configured to convert at least part of the second light source light received by the second green-yellow luminescent material into second green-yellow luminescent material light; wherein the second green-yellow luminescent material light may have a second green-yellow centroid wavelength (λcg2) selected from the range of 490-590 nm; (H) the second broadband luminescent material may be configured to convert at least part of the second light source light received by the second broadband luminescent material into second broadband luminescent material light; wherein the second broadband luminescent material light may have a second broadband centroid wavelength (λcb2) selected from the range of 600-660 nm; wherein the second broadband luminescent material light may comprise at least one emission band having a second broadband full width at half maximum FWHMb2 of > 60 nm; (I) the second narrowband luminescent material may be configured to convert at least part of the second light source light received by the second narrowband luminescent material into second narrowband luminescent material light; wherein the second narrowband luminescent material light may have a second narrowband centroid wavelength (λcn2) selected from the range of 610-650 nm; wherein the second narrowband luminescent material light may comprise at least one emission band having a second narrowband full width at half maximum FWHMn2 of < 40 nm; (J) the second light generating device may be configured to generate second device light comprising at least part of the second light source light, the second green-yellow luminescent material light, the second broadband luminescent material light, and the second narrowband luminescent material light; wherein the second device light may be white light having a second correlated color temperature (CCT2); wherein (CCT2 - CCTi) > 500 K; wherein one or more of the following applies: (i) a relative spectral power of the second broadband2024PF80392

[0110] 28

[0111] luminescent material light in the second device light may differ from a relative spectral power of the first broadband luminescent material light in the first device light, and (ii) a relative spectral power of the second narrowband luminescent material light in the second device light may differ from a relative spectral power of the first narrowband luminescent material light in the first device light; (K) the third light generating device may comprise a third solid state light source and a third luminescent converter; wherein the third solid state light source may be configured to generate third light source light having a third peak wavelength (λp3) selected from the range of 380-490 nm; wherein the third luminescent converter may be configured in a light receiving relationship with the third solid state light source; wherein the third luminescent converter may comprise a third narrowband luminescent material; (L) the third narrowband luminescent material may be configured to convert at least part of the third light source light received by the third narrowband luminescent material into third narrowband luminescent material light; wherein the third narrowband luminescent material light may have a third narrowband centroid wavelength (λcn3) selected from the range of 610-650 nm; wherein the third narrowband luminescent material light may comprise at least one emission band having a third narrowband full width at half maximum FWHMns of < 40 nm; (M) the third light generating device may be configured to generate third device light comprising the third narrowband luminescent material light; wherein the third device light may have a third device centroid wavelength (λcd3) selected from the range of 610-650 nm; (N) the light generating system may be configured to generate system light comprising one or more of the first device light, the second device light, and the third device light; and (O) the control system may be configured to control, in an operational mode of the light generating system, a spectral power distribution of the system light in the wavelength range of 380-780 nm by individually controlling the first light generating device, the second light generating device, and the third light generating device, wherein the system light in that operational mode may be white light having a correlated color temperature selected from the range of 2000-6500 K and a color rendering index of at least 80. As indicated above, such a light generating system may facilitate adjusting the ratio between (first and / or second) broadband luminescent material light and (first, second, and / or third) narrowband luminescent material light in the system light, by adjusting the relative intensities of the first device light, second device light, and third device light. Further, such a light generating system may facilitate that, would the (first, second, and / or third) narrowband luminescent material degrade and / or be thermally quenched, the control system may be configured to adjust a relative contribution of the third2024PF80392

[0112] 29

[0113] device light to the system light to maintain a color point and / or correlated color temperature of the system light.

[0114] Hence, the first light generating device may comprise a first luminescent converter, wherein the first luminescent converter may comprise a (first) green-yellow luminescent material, a (first) broadband luminescent material, and a (first) narrowband luminescent material. Especially, the first luminescent converter may comprise the (first) broadband luminescent material in a first broadband concentration (Cbi). In embodiments, the first broadband concentration (Cbi) may be selected from the range of > 2 wt.%, such as from the range of > 5 wt.%, especially from the range of > 7 wt.%. Additionally or alternatively, the first broadband concentration (Cbi) may be selected from the range of < 30 wt.%, such as from the range of < 25 wt.%, especially from the range of < 20 wt.%. Further, the first luminescent converter may comprise the (first) narrowband luminescent material in a first narrowband concentration (Cni). In embodiments, the first narrowband concentration (Cni) may be selected from the range of > 2 wt.%, such as from the range of > 5 wt.%, especially from the range of > 7 wt.%. Additionally or alternatively, the first narrowband concentration (Cni) may be selected from the range of < 40 wt.%, such as from the range of < 35 wt.%, especially from the range of < 30 wt.%. Herein, the first broadband concentration (Cbi) and the first narrowband concentration (Cni) may especially refer to a weight percentage of the respective luminescent material relative to the total weight of the first luminescent converter (comprising the first green-yellow luminescent material, first broadband luminescent material, and first narrowband luminescent material). Further, the first luminescent converter may comprise the (first) broadband luminescent material and the (first) narrowband luminescent material in a first ratio Ri. In embodiments, Ri = Cbi / Cni may apply.

[0115] Further, the second light generating device may comprise a second luminescent converter, wherein the second luminescent converter may comprise a (second) green-yellow luminescent material, a (second) broadband luminescent material, and a (second) narrowband luminescent material. Especially, the second luminescent converter may comprise the (second) broadband luminescent material in a second broadband concentration (Cb2). In embodiments, the second broadband concentration (Cb2) may be selected from the range of > 2 wt.%, such as from the range of > 5 wt.%, especially from the range of > 7 wt.%. Additionally or alternatively, the second broadband concentration (Cb2) may be selected from the range of < 30 wt.%, such as from the range of < 25 wt.%, especially from the range of < 20 wt.%. Further, the second luminescent converter may comprise the (second) narrowband luminescent material in a second narrowband concentration (Cn2). In2024PF80392

[0116] 30

[0117] embodiments, the second narrowband concentration (Cn2) may be selected from the range of > 2 wt.%, such as from the range of > 5 wt.%, especially from the range of > 7 wt.%.

[0118] Additionally or alternatively, the second narrowband concentration (Cn2) may be selected from the range of < 40 wt.%, such as from the range of < 35 wt.%, especially from the range of < 30 wt.%. Herein, the second broadband concentration (Cb2) and the second narrowband concentration (Cn2) may especially refer to a weight percentage of the respective luminescent material relative to the total weight of the second luminescent converter (comprising the second green-yellow luminescent material, second broadband luminescent material, and second narrowband luminescent material). Further, the second luminescent converter may comprise the (second) broadband luminescent material and the (second) narrowband luminescent material in a second ratio R2. In embodiments, R2 = Cb2 / Cn2 may apply. Further, in embodiments, Ri > R2 may apply, such as R1 / R2 > 1.05, especially R1 / R2 > 1.1. Further yet, in embodiments, R1 / R2 > 1.2 may apply, such as R1 / R2 > 1.3, especially R1 / R2 > 1.4. Additionally or alternatively, R1 / R2 <3.5 may apply, such as R1 / R2 < 3, especially R1 / R2 < 2.5, like R1 / R2 < 2. Hence, in specific embodiments, (A) the first luminescent converter may comprise (i) the (first) broadband luminescent material in a first broadband concentration (Cbi), and (ii) the (first) narrowband luminescent material in a first narrowband concentration (Cni); wherein Ri = Cbi / Cni; (B) the second luminescent converter may comprise (i) the (second) broadband luminescent material in a second broadband concentration (Cb2), and (ii) the (second) narrowband luminescent material in a second narrowband concentration (Cn2); wherein R2 = Cb2 / Cn2; and (C) R1 / R2 > 1.1. Such a ratio R1 / R2 may facilitate that the second luminescent converter may comprise relatively more of the narrowband luminescent material than the first luminescent converter. Hence, such a ratio R1 / R2 may facilitate that the second device light may have a relatively larger contribution of narrowband emission in the red wavelength range compared to the first device light, thereby facilitating that the control system may control a ratio between the broadband (red) emission and narrowband (red) emission in the system light by individually controlling the first light generating device and the second light generating device.

[0119] Hence, the first luminescent converter may have the first ratio Ri. In embodiments, Ri > 0.4 may apply, such as Ri > 0.5, especially Ri > 0.6. Additionally or alternatively, Ri < 1.1 may apply, such as Ri < 1, especially Ri < 0.9. Hence, in embodiments, 0.4 < Ri < 1.1 may apply, such as 0.5 < Ri < 1, especially 0.6 < Ri < 0.9. Further, the second luminescent converter may have the second ratio R2. In embodiments, R2 > 0.2 may apply, such as R2 > 0.3, especially R2 > 0.4. Additionally or alternatively, R2 < 12024PF80392

[0120] 31

[0121] may apply, such as R2 < 0.9, especially R2 < 0.8. That is, in embodiments, 0.2 < R2 < 1 may apply, such as 0.3 < R2 < 0.9, especially 0.4 < R2 < 0.8. Hence, in specific embodiments, one or more may apply of 0.5 < Ri < 1 and 0.3 < R2 < 0.9. Such a ratio Ri and / or R2 may facilitate that the first and / or second luminescent converter may comprise the narrowband luminescent material in an equal or higher concentration compared to the broadband luminescent material, such that the first device light and / or second device light may comprise a substantial contribution from the narrowband luminescent material light.

[0122] The first light generating device (comprising the first luminescent converter) may be configured to generate first device light. The first device light may comprise at least part of the first light source light, the (first) green-yellow luminescent material light, the (first) broadband luminescent material light, and the (first) narrowband luminescent material light. Especially, the first device light may have a spectral power distribution, wherein > 3%, such as > 5%, especially > 7%, of the spectral power in the wavelength range of 380-780 nm may be provided by the first light source light. Additionally or alternatively, the first device light may have a spectral power distribution, wherein < 20%, such as < 15%, especially < 10%, of the spectral power in the wavelength range of 380-780 nm may be provided by the first light source light. Further, the first device light may have a spectral power distribution, wherein > 5%, such as > 10%, especially > 15%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (first) green-yellow luminescent material light. Additionally or alternatively, the first device light may have a spectral power distribution, wherein < 50%, such as < 45%, especially < 40%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (first) green-yellow luminescent material light. Further, the first device light may have a spectral power distribution, wherein > 5%, such as > 10%, especially > 15%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (first) broadband luminescent material light. Additionally or alternatively, the first device light may have a spectral power distribution, wherein < 45%, such as < 40%, especially < 35%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (first) broadband luminescent material light. Further yet, the first device light may have a spectral power distribution, wherein > 15%, such as > 20%, especially > 25%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (first) narrowband luminescent material light. Additionally or alternatively, the first device light may have a spectral power distribution, wherein < 65%, such as < 60%, especially < 55%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (first) narrowband luminescent material light.2024PF80392

[0123] 32

[0124] Further, the first device light may have a spectral power distribution, wherein xi, i% of the spectral power in the wavelength range of 600-660 nm may be provided by the (first) broadband luminescent material light. In embodiments, xi,i% > 20% may apply, such as xi, i% > 25%, especially xi,i% > 30%. Additionally or alternatively, in embodiments, xi,i% < 45% may apply, such as xi,i% < 40%, especially xi,i% < 35%. Hence, in embodiments, 20% < xi, i% < 45% may apply, such as 25% < xi,i% < 40%, especially 30% < xi,i% < 35%. Further, the first device light may have a spectral power distribution, wherein X2,i% of the spectral power in the wavelength range of 600-660 nm may be provided by the (first) narrowband luminescent material light. In embodiments, X2,i% > 55% may apply, such as X2,i% > 60%, especially X2,i% > 65%. Additionally or alternatively, in embodiments, X2,i% < 80% may apply, such as X2,i% < 75%, especially X2,i% < 70%. Hence, in embodiments, 55% < X2,i% < 80% may apply, such as 60% < X2,i% < 75%, especially 65% < X2,i% < 70%.

[0125] Further, in embodiments, xi,i / x2,i > 0.25 may apply, such as xi,i / x2,i > 0.3, especially xi,i / x2,i > 0.35. Additionally or alternatively, xi,i / x2,i < 0.75 may apply, such as xi,i / x2,i < 0.7, especially xi,i / x2,i < 0.65. That is, in embodiments, 0.25 < xi,i / x2,i < 0.75 may apply, such as 0.3 < xi,i / x2,i < 0.7, especially 0.35 < xi,i / x2,i < 0.65. Hence, in specific embodiments, the first device light may have a spectral power distribution, wherein: (i) xi,i% of the spectral power in the wavelength range of 600-660 nm may be provided by the broadband luminescent material light, and (ii) X2,i% of the spectral power in the wavelength range of 600-660 nm may be provided by the narrowband luminescent material light; wherein 0.3 < xi,i / x2,i < 0.7. Such a ratio xi,i / x2,i may facilitate that the spectral power in the wavelength range of 600-660 nm may be mainly provided by the (first) narrowband luminescent material. That is, the first device light may have mostly narrowband emission in the wavelength range of 600-660 nm.

[0126] The first device light may thus comprise blue light (from the first light source light), green-yellow light (from the first green-yellow luminescent material light), and (orange-)red light (from the first broadband and first narrowband luminescent material lights). Hence, the first device light may especially be white light. The term “white light”, and similar terms, herein, is known to the person skilled in the art. It may especially relate to light having a correlated color temperature (CCT) between about 1500 K and 20000 K, such as between 2000 and 20000 K, especially between 2700 and 20000 K, for general lighting especially in the range of about 2000-7000 K, such as in the range of 2700-6500 K. In embodiments, the correlated color temperature (CCT) may especially be within about 20 SDCM (standard deviation of color matching) from the BBL (black body locus), such as2024PF80392

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[0128] within 15 SDCM from the BBL, especially within 10 SDCM from the BBL, like within 5 SDCM from the BBL. In embodiments, the first device light may especially be white light having a first correlated color temperature (CCTi). In embodiments, the first CCT (CCTi) may be selected from the range of > 1500 K, such as from the range of > 2000 K, especially from the range of > 2500 K, like from the range of > 2700 K. Additionally or alternatively, the first CCT (CCTi) may be selected from the range of < 7000 K, such as from the range of < 6500 K, especially from the range of < 6000 K, like from the range of < 5500 K. Hence, the first device light may be white light having a first CCT (CCTi) selected from the range of 1500-7000 K, such as from the range of 2000-6500 K, especially from the range of 2500-6000 K, like from the range of 2700-5500 K. Further, the (white) first device light may have a color rendering index (CRI) of at least 75, such as at least 80, especially at least 85.

[0129] The (white) first device light may have a color point, such as especially a color point in the CIE 1931 color space. In embodiments, the first device light may have a color point below the BBL. Such a color point may provide first device light with a relatively higher CRI and / or improved red rendering. Yet, especially, the first device light may have a color point above the BBL. Further, the first device light may have a color point (in the CIE 1931 color space) on the black body locus. Alternatively, the first device light may have a color point (in the CIE 1931 color space) with a distance to the black body locus of at least 1 SDCM, such as at least 2 SDCM, especially at least 3 SDCM (wherein the color point may be above or below the BBL). Additionally or alternatively, the first device light may have a color point (in the CIE 1931 color space) with a distance to the black body locus within 15 SDCM, such as within 10 SDCM, especially within 7 SDCM (wherein the color point may be above or below the BBL).

[0130] The second light generating device (comprising the second luminescent converter and the second solid state light source) may be configured to generate second device light. The second device light may comprise at least part of the second light source light, the (second) green-yellow luminescent material light, the (second) broadband luminescent material light, and the (second) narrowband luminescent material light.

[0131] Especially, the second device light may have a spectral power distribution, wherein > 3%, such as > 5%, especially > 7%, of the spectral power in the wavelength range of 380-780 nm may be provided by the second light source light. Additionally or alternatively, the second device light may have a spectral power distribution, wherein < 20%, such as < 15%, especially < 10%, of the spectral power in the wavelength range of 380-780 nm may be provided by the second light source light. Further, the second device light may have a2024PF80392

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[0133] spectral power distribution, wherein > 7%, such as > 13%, especially > 20%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (second) green-yellow luminescent material light. Additionally or alternatively, the second device light may have a spectral power distribution, wherein < 70%, such as < 60%, especially < 55%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (second) green-yellow luminescent material light. Further, the second device light may have a spectral power distribution, wherein > 5%, such as > 10%, especially > 15%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (second) broadband luminescent material light. Additionally or alternatively, the second device light may have a spectral power distribution, wherein < 45%, such as < 40%, especially < 35%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (second) broadband luminescent material light. Further yet, the second device light may have a spectral power distribution, wherein > 20%, such as > 25%, especially > 30%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (second) narrowband luminescent material light. Additionally or alternatively, the second device light may have a spectral power distribution, wherein < 70%, such as < 65%, especially < 60%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (second) narrowband luminescent material light.

[0134] Further, the second device light may have a spectral power distribution, wherein xi,2% of the spectral power in the wavelength range of 600-660 nm may be provided by the (second) broadband luminescent material light. In embodiments, xi,2% > 20% may apply, such as xi,2% > 25%, especially xi,2% > 30%. Additionally or alternatively, in embodiments, xi,2% < 45% may apply, such as xi,2% < 40%, especially xi,2% < 35%. Hence, in embodiments, 20% < xi,2% < 45% may apply, such as 25% < xi,2% < 40%, especially 30% < xi, 2% < 35%. Further, the second device light may have a spectral power distribution, wherein X2,2% of the spectral power in the wavelength range of 600-660 nm may be provided by the (second) narrowband luminescent material light. In embodiments, X2,2% > 55% may apply, such as X2,2% > 60%, especially X2,2% > 65%. Additionally or alternatively, in embodiments, X2,2% < 80% may apply, such as X2,2% < 75%, especially X2,2% < 70%. Hence, in embodiments, 55% < X2,2% < 80% may apply, such as 60% < X2,2% < 75%, especially 65% < X2,2% < 70%. Further, in embodiments, xi,2 / x2,2 > 0.25 may apply, such as xi,2 / x2,2 > 0.3, especially xi,2 / x2,2 > 0.35. Additionally or alternatively, xi,2 / x2,2 < 0.65 may apply, such as xi,2 / x2,2 < 0.6, especially xi,2 / x2,2 < 0.55. That is, in embodiments, 0.25 < xi,2 / x2,2 < 0.65 may apply, such as 0.3 < xi,2 / x2,2 < 0.6, especially 0.35 < xi,2 / x2,2 < 0.55. Hence, in specific2024PF80392

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[0136] embodiments, the second device light may have a spectral power distribution, wherein: (i) xi, 2% of the spectral power in the wavelength range of 600-660 nm may be provided by the broadband luminescent material light, and (ii) X2,2% of the spectral power in the wavelength range of 600-660 nm may be provided by the narrowband luminescent material light; wherein 0.3 < xi,2 / x2,2 < 0.6. Such a ratio xi,2 / x2,2 may facilitate that the spectral power in the wavelength range of 600-660 nm may be mainly provided by the (second) narrowband luminescent material. That is, the second device light may have mostly narrowband emission in the wavelength range of 600-660 nm.

[0137] In embodiments, a relative spectral power of the (second) broadband luminescent material light in the second device light may be (essentially) equal to a relative spectral power of the (first) broadband luminescent material light in the first device light. That is, in embodiments, xi,i = xi,2 may apply. Yet, in alternative embodiments, a relative spectral power of the (second) broadband luminescent material light in the second device light may differ from a relative spectral power of the (first) broadband luminescent material light in the first device light. Hence, xi,i xi,2 may apply. Especially, in embodiments, xi,i > xi, 2 may apply, such as xi,i > l.l*xi,2, especially xi,i > 1.25*XI,2. Additionally or alternatively, xi,i < 3*XI,2 may apply, such as xi,i < 2.5*XI,2, especially xi,i < 2*XI,2.

[0138] Additionally or alternatively, a relative spectral power of the (second) narrowband luminescent material light in the second device light may differ from a relative spectral power of the (first) narrowband luminescent material light in the first device light. Hence, X2,i X2,2 may apply. Especially, in embodiments, X2,2 > X2,i may apply, such as X2,2 > l.l*X2,i, especially X2,2 > 1.25*X2, I. Additionally or alternatively, X2,2 < 3*X2, I may apply, such as X2,2 < 2.5*X2, I, especially X2,2 < 2*X2, L Further, in embodiments, a relative spectral power of the (second) narrowband luminescent material light in the second device light may be (essentially) equal to a relative spectral power of the (first) narrowband luminescent material light in the first device light (i.e., X2,2 = X2,i may apply). Yet, especially, one or more of the following may apply: (i) a relative spectral power of the (second) broadband luminescent material light in the second device light may differ from a relative spectral power of the (first) broadband luminescent material light in the first device light, and (ii) a relative spectral power of the (second) narrowband luminescent material light in the second device light may differ from a relative spectral power of the (first) narrowband luminescent material light in the first device light.

[0139] As indicated above, the second device light may comprise blue light (from the second light source light), green-yellow light (from the second green-yellow luminescent2024PF80392

[0140] 36

[0141] material light), and (orange-)red light (from the second broadband and second narrowband luminescent material lights). Hence, the second device light may especially be white light. Further, the second device light may be white light having a second correlated color temperature (CCT2). In embodiments, the second CCT (CCT2) may be selected from the range of > 1500 K, such as from the range of > 2000 K, especially from the range of > 2500 K, like from the range of > 2700 K. Additionally or alternatively, the second CCT (CCT2) may be selected from the range of < 7000 K, such as from the range of < 6500 K, especially from the range of < 6000 K, like from the range of < 5500 K. Hence, the second device light may be white light having a second CCT (CCT2) selected from the range of 1500-7000 K, such as from the range of 2000-6500 K, especially from the range of 2500-6000 K, like from the range of 2700-5500 K. In embodiments, the second CCT (CCT2) may be higher than the first CCT (CCTi), i.e., CCT2 > CCTi may apply. Especially, in embodiments, (CCT2 -CCTi) > 300 K may apply, such as (CCT2 - CCTi) > 500 K, especially (CCT2 - CCTi) > 700 K. Further, (CCT2 - CCTi) > 1000 K may apply, such as (CCT2 - CCTi) > 1500 K, especially (CCT2 - CCTi) > 2000 K. Additionally or alternatively, in embodiments, (CCT2 -CCTi) < 5000 K may apply, such as (CCT2 - CCTi) < 3000 K, especially (CCT2 - CCTi) < 1500 K.

[0142] The (white) second device light may have a color rendering index (CRI) of at least 75, such as at least 80, especially at least 85. Further, the (white) second device light may have a color point, such as especially a color point in the CIE 1931 color space. In embodiments, the second device light may have a color point below the BBL. Such a color point may provide second device light with a relatively higher CRI and / or improved red rendering. Yet, especially, the second device light may have a color point above the BBL. Hence, in specific embodiments, one or more of the first device light and the second device light may have a color point above the black body locus. As the third device light may have a color point below the BBL (see below), first device light and / or second device light having a color point above the BBL may facilitate that, by admixing some third device light into the first device light and / or second device light in the system light, a color point of the system light may be close to or on the BBL.

[0143] The second device light may alternatively have a color point (in the CIE 1931 color space) on the black body locus. Further, the second device light may have a color point (in the CIE 1931 color space) with a distance to the black body locus of at least 1 SDCM, such as at least 2 SDCM, especially at least 3 SDCM (wherein the color point may be above or below the BBL). Additionally or alternatively, the second device light may have a color2024PF80392

[0144] 37

[0145] point (in the CIE 1931 color space) with a distance to the black body locus within 15 SDCM, such as within 10 SDCM, especially within 7 SDCM (wherein the color point may be above or below the BBL). Hence, in specific embodiments, one or more may apply of: (i) the first device light may have a color point with a distance to the black body locus within 10 standard deviation of color matching, and (ii) the second device light may have a color point with a distance to the black body locus within 10 standard deviation of color matching. Such a color point for the first device light and / or the second device light may facilitate that said first device light and / or second device light may better mimic the radiation of the black body locus, and may have a color point within tolerance for a general lighting system.

[0146] The third light generating device may comprise a third luminescent converter, wherein the third luminescent converter may comprise a (third) narrowband luminescent material. Especially, the third luminescent converter may comprise the (third) narrowband luminescent material in a third narrowband concentration (Cn3). In embodiments, the third narrowband concentration (Cn3) may be selected from the range of > 30 wt.%, such as from the range of > 40 wt.%, especially from the range of > 50 wt.%. Especially, the third luminescent converter may consist for at least 70 wt.%, such as for at least 80 wt.%, especially for at least 90 wt.% of the narrowband luminescent material.

[0147] Herein, the third narrowband concentration (Cn3) may especially refer to a weight percentage of the (third) narrowband luminescent material relative to the total weight of the first luminescent converter. Further, the third luminescent converter may comprise the (third) narrowband luminescent material and one or more further luminescent materials (in a third further concentration CFS) in a third ratio Rs.

[0148] Hence, the third luminescent converter may have the third ratio Rs and Rs = CFs / Cni may apply. In embodiments, Rs < 0.4 may apply, such as Rs < 0.25, such as Rs < 0.1, especially Rs < 0.01. This may include embodiments in which Rs converges towards substantially zero meaning that the third luminescent converter is free from further luminescent materials other than the (third) narrowband luminescent material.

[0149] The third light generating device (comprising the third luminescent converter and the third solid state light source) may be configured to generate third device light. The third device light may comprise the (third) narrowband luminescent material light.

[0150] Especially, the third device light may have a spectral power distribution, wherein > 85%, such as > 90%, especially > 95%, like > 98%, including (essentially) 100%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (third) narrowband luminescent material light. Hence, in embodiments, the third device light may (essentially)2024PF80392

[0151] 38

[0152] consist of the (third) narrowband luminescent material light. Additionally or alternatively, the third device light may have a spectral power distribution, wherein < 98%, such as < 95%, especially < 90%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (third) narrowband luminescent material light. Further, the third device light may comprise at least part of the third light source light. That is, the third device light may have a spectral power distribution, wherein > 0%, such as > 0.5%, especially > 1%, of the spectral power in the wavelength range of 380-780 nm may be provided by the third light source light. Further, the third device light may have a spectral power distribution, wherein > 2%, such as > 3%, especially > 5%, of the spectral power in the wavelength range of 380-780 nm may be provided by the third light source light. Yet, especially, the third device light may be (essentially) free from third light source light. That is, the third device light may have a spectral power distribution, wherein < 12%, such as < 10%, especially < 7%, of the spectral power in the wavelength range of 380-780 nm may be provided by the third light source light. Further, the third device light may have a spectral power distribution, wherein <5%, such as < 3%, especially < 2%, including (essentially) 0%, of the spectral power in the wavelength range of 380-780 nm may be provided by the third light source light. Hence, in specific embodiments, the third device light may have a spectral power distribution, wherein < 10% of the spectral power in the wavelength range of 380-780 nm may be provided by the third light source light. Such third device may thus comprise little to (essentially) no third light source light. Hence, such third device light may be applied in situations where blue light is undesired, e.g. in photography darkrooms or cleanrooms.

[0153] Hence, the third device light may comprise the (third) narrowband luminescent material light, and may optionally comprise at least part of the third light source light. Yet, especially, the third device light may (essentially) consist of the (third) narrowband luminescent material light. In such embodiments, the third device light may have a third device centroid wavelength (Xcas). The third device centroid wavelength (Zeds) may be selected from the range of 600-660 nm, such as from the range of 610-650 nm, especially from the range of 620-640 nm, like from the range of 625-635 nm. Further, the third device light may have a spectral power distribution, wherein > 85%, such as > 90%, especially > 95%, like > 98%, including (essentially) 100%, of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 600-660 nm. That is, in embodiments, the third device light may comprise, such as be, one or more of orange light and red light, such as especially red light. Hence, in specific embodiments, the third device light may have a spectral power distribution, wherein > 95% of the spectral power in the wavelength range of2024PF80392

[0154] 39

[0155] 380-780 nm may be in the wavelength range of 600-660 nm. Such third device light may especially be red light consisting (essentially) entirely of third narrowband luminescent material light. Hence, by controlling (the intensity of the third device light generated by) the third light generating device, the control system may be configured to control a contribution of the narrowband luminescent material light to the system light. Further, such third device light may especially have a color point below the BBL.

[0156] The third light generating device, such as especially the third luminescent converter, may be (essentially) free from the green-yellow luminescent material. Hence, the third device light may have a spectral power distribution, wherein < 10, such as < 7%, especially < 5%, like < 2%, including (essentially) 0%, of the spectral power in the wavelength range of 380-780 nm may be provided by green-yellow luminescent material light. Further, the third light generating device, such as especially the third luminescent converter, may be (essentially) free from the broadband luminescent material. Hence, the third device light may have a spectral power distribution, wherein < 10, such as < 7%, especially < 5%, like < 2%, including (essentially) 0%, of the spectral power in the wavelength range of 380-780 nm may be provided by broadband luminescent material light.

[0157] As indicated above, the light generating system may be configured to generate system light. The system light may comprise one or more of the first device light, the second device light, and the third device light. Further, the system light may comprise a control system, wherein the control system may be configured to individually control the first light generating device, the second light generating device, and the third light generating device. The term “controlling” and similar terms especially refer at least to determining the behavior or supervising the running of an element. Hence, herein the term “controlling” and similar terms may include imposing behavior on an element and / or monitoring the element. The controlling of the element can be done with a control system. The control system and the element may thus at least temporarily, or permanently, functionally be coupled. The element may comprise the control system. The control system and element may not be physically coupled. Control can be done via wired and / or wireless control. A control system may comprise or may be functionally coupled to a user interface. The control system may also be configured to receive and execute instructions from a remote control. The control system may be controlled via an App on a device, such as a portable device. In such embodiments the control system of the lighting system may be a slave control system. The lighting system may also comprise means for communicating with other systems or devices, such as on the basis of Bluetooth, Thread, WIFI, LiFi, ZigBee, BLE or WiMAX, or another wireless technology.2024PF80392

[0158] 40

[0159] The control system may control in dependence of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer. The term “timer” may refer to a clock and / or a predetermined time scheme.

[0160] Hence, the light generating system may comprise (or be functionally coupled with) a control system. The control system may be configured to individually control the first light generating device, the second light generating device, and the third light generating device. Further, the control system may be configured to control one or more of a spectral power distribution, an intensity, a CCT, and a CRI of the system light (by individually controlling the first light generating device, the second light generating device, and the third light generating device). Especially, the control system may be configured to control, in an operational mode of the light generating system, a spectral power distribution of the system light in the wavelength range of 380-780 nm by individually controlling the first light generating device, the second light generating device, and the third light generating device. In embodiments, (in an operational mode of the light generating system,) the system light may comprise (such as consist of) the third device light. In such embodiments, the system light may especially have a system centroid wavelength (Xcs) selected from the range of 600-660 nm, such as from the range of 610-650 nm, especially from the range of 620-640 nm. Hence, in such embodiments, the system light may comprise, such as be, one or more of orange light and red light, such as especially red light. That is, in an operational mode of the light generating system, the system light may consist of the third device light. Further, in an operational mode of the light generating system, the system light may be red light. Yet, especially, in an operational mode of the light generating system, the system light may be white light. In such an operational mode, the system light may comprise one or more of the first device light, the second device light, and the third device light, such as at least one of the first device light and the second device light. Hence, in an operational mode of the light generating system, the system light may consist of first device light, wherein the system light may be white light. Additionally, in an(other) operational mode of the light generating system, the system light may consist of second device light, wherein the system light may be white light. Further, in an(other) operational mode of the light generating system, the system light may comprise at least two of the first device light, second device light, and third device light, and the system light may be colored light (such as especially red light). Yet, in (an)other operational mode of the light generating system, the system light may comprise at least two of the first device light, second device light, and third device light, and the system light may be white light. Hence, in one or more operational modes, the system light may be2024PF80392

[0161] 41

[0162] white light. The (white) system light may have a correlated color temperature (CCT) selected from the range of > 1500 K, such as from the range of > 2000 K, especially from the range of > 2500 K, like from the range of > 2700 K. Additionally or alternatively, the (white) system light may have a CCT selected from the range of < 7000 K, such as from the range of < 6500 K, especially from the range of < 6000 K, like from the range of < 5500 K. Hence, (in an operational mode of the light generating system,) the system light may be white light having a CCT selected from the range of 1500-7000 K, such as from the range of 2000-6500 K, especially from the range of 2500-6000 K, like from the range of 2700-5500 K. Further, (in said operational mode of the light generating system,) the system light may be white light having a color rendering index of at least 75, such as at least 80, especially at least 85.

[0163] As indicated above, the system light may comprise one or more of the first device light, the second device light, and the third device light. Hence, the system light may comprise one or more of the first light source light, the second light source light, and optionally the third light source light. That is, the system light may comprise blue light. Especially, (in an operational mode of the light generating system,) the system light may have a spectral power distribution, wherein > 2%, such as > 5%, especially > 7%, like > 10%, of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 380-490 nm. Additionally or alternatively, the system light may have a spectral power distribution, wherein < 20%, such as < 17%, especially < 15%, like < 12%, of the spectral power in the wavelength range of 380-780 nm may be in the wavelength range of 380-490 nm. Further, the system light may comprise one or more of the green-yellow luminescent material light, the broadband luminescent material light, and the narrowband luminescent material light. Especially, (in an operational mode of the light generating system,) the system light may have a spectral power distribution, wherein > 2%, such as > 5%, especially > 7%, like > 10%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (first and / or second) green-yellow luminescent material light. Additionally or alternatively, the system light may have the spectral power distribution, wherein < 70%, such as < 60%, especially < 55%, like < 50%, of the spectral power in the wavelength range of 380-780 nm may be provided by the (first and / or second) green-yellow luminescent material light. Further, in an operational mode of the light generating system, the system light may have a spectral power distribution, wherein x1% of the spectral power in the wavelength range of 600-660 nm may be provided by the (first and / or second) broadband luminescent material light. In embodiments, x1% > 25% may apply, such as x1% > 30%, especially x1% > 35%. Additionally or alternatively, in embodiments, x1% < 50% may apply, such as x1% <2024PF80392

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[0165] 45%, especially x1% < 40%. Hence, in embodiments, 25% < x1% < 50%, such as 30% < x1% < 45%, especially 35% < x1% < 40%. That is, the system light may have a spectral power distribution, wherein 25-50%, such as 30-45%, especially 35-40%, of the spectral power in the wavelength range of 600-660 nm may be provided by the (first and / or second) broadband luminescent material light. Further, the system light may have a spectral power distribution, wherein x2% of the spectral power in the wavelength range of 600-660 nm may be provided by the (first, second, and / or third) narrowband luminescent material light. In embodiments, x2% > 50% may apply, such as x2% > 55%, especially x2% > 60%. Additionally or alternatively, in embodiments, x2% < 75% may apply, such as x2% < 70%, especially x2% < 65%. Hence, in embodiments, 50% < x2% < 75%, such as 55% < x2% < 70%, especially 60% < x2% < 65%. That is, the system light may have a spectral power distribution, wherein 50-75%, such as 55-70%, especially 60-65%, of the spectral power in the wavelength range of 600-660 nm may be provided by the (first, second, and / or third) narrowband luminescent material light. Further, in embodiments, x1 / x2> 0.4 may apply, such as x1 / x2> 0.5, especially x1 / x2> 0.6, like x1 / x2> 0.65. Additionally or alternatively, x1 / x2< 1 may apply, such as x1 / x2< 0.9, especially x1 / x2< 0.8, like x1 / x2< 0.75. Hence, in embodiments, 0.4 < x1 / x2< 1 may apply, such as 0.5 < x1 / x2< 0.9, especially 0.6 < x1 / x2< 0.8, like 0.65 < x1 / x2< 0.75.

[0166] In embodiments, as indicated above, the control system may be configured to control a spectral power distribution of the system light. Especially, the control system may be configured to control a ratio x1 / x2by individually controlling the first light generating device, the second light generating device, and the third light generating device. Hence, in specific embodiments, in an operational mode of the light generating system, the system light may have a spectral power distribution, wherein: (i) x1% of the spectral power in the wavelength range of 600-660 nm may be provided by the broadband luminescent material light, and (ii) x2% of the spectral power in the wavelength range of 600-660 nm may be provided by the narrowband luminescent material light; wherein the control system may be configured to control a ratio x1 / x2by individually controlling the first light generating device, the second light generating device, and the third light generating device. Such a ratio x1 / x2may facilitate that the system light (in the operational mode) may comprise relatively more (first, second, and / or third) narrowband luminescent material light than (first and / or second) broadband luminescent material light, thereby providing system light with a relatively high CRI (such as especially a relatively high CRI R9 score). Further, a control system configured to control the ratio x1 / x2may facilitate adjusting the relative contribution of the (first, second,2024PF80392

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[0168] and / or third) narrowband luminescent material light to the system light while maintaining a CCT of the system light.

[0169] In embodiments, the first luminescent converter may comprise the (first) green-yellow luminescent material, the (first) broadband luminescent material, and the (first) narrowband luminescent material, wherein the (first) green-yellow luminescent material, the (first) broadband luminescent material, and the (first) narrowband luminescent material may be configured evenly dispersed throughout the first luminescent converter. Alternatively, one or more of the (first) green-yellow luminescent material, the (first) broadband luminescent material, and the (first) narrowband luminescent material may be present in a gradient in the first luminescent converter (wherein the gradient may especially be along a direction of an optical axis of the first light source light through the first luminescent converter). Further, in embodiments, the first luminescent converter may comprise a layer stack. The layer stack may comprise a primary first luminescent converter layer and a secondary first luminescent converter layer. In embodiments, the secondary first luminescent converter layer may be configured downstream of the primary first luminescent converter layer. Further, the secondary first luminescent converter layer may be configured in physical contact with the primary first luminescent converter layer. Alternatively, the secondary first luminescent converter layer may be configured physically separated from the primary first luminescent converter layer, such as separated by a second non-zero distance d2, wherein the second nonzero distance d2 may be selected from the same range as di (see above). In embodiments, the primary first luminescent converter layer may comprise > 80%, such as > 90%, especially > 95%, like > 98%, including (essentially) 100%, of the (first) broadband luminescent material. Further, the secondary first luminescent converter layer may comprise > 80%, such as > 90%, especially > 95%, like > 98%, including (essentially) 100%, of the (first) green-yellow luminescent material. In embodiments, one or more of the primary first luminescent converter layer and the secondary first luminescent converter layer may comprise the (first) narrowband luminescent material. Hence, in embodiments, the (first) narrowband luminescent material may be distributed over the primary first luminescent converter layer and the secondary first luminescent converter layer, wherein each converter layer may comprise selected from the range of 20-80%, such as 10-90%, especially 5-95%, of the (first) narrowband luminescent material. Alternatively, the primary first luminescent converter layer may comprise > 80%, such as > 90%, especially > 95%, like > 98%, including (essentially) 100%, of the (first) narrowband luminescent material. Yet, in other embodiments, the secondary first luminescent converter layer may comprise > 80%, such as > 90%, especially2024PF80392

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[0171] > 95%, like > 98%, including (essentially) 100%, of the (first) narrowband luminescent material. Hence, in specific embodiments, the first luminescent converter may comprise a layer stack comprising a primary first luminescent converter layer and a secondary first luminescent converter layer; wherein the secondary first luminescent converter layer may be configured downstream of the primary first luminescent converter layer; wherein the primary first luminescent converter layer may comprise > 90% of the first broadband luminescent material; wherein the secondary first luminescent converter layer may comprise > 90% of the first green-yellow luminescent material; and wherein one or more of the primary first luminescent converter layer and the secondary first luminescent converter layer may comprise the first narrowband luminescent material. Such a layer stack may facilitate reducing the amount of (first) green-yellow luminescent material light absorbed and converted by the (first) broadband luminescent material, thereby increasing the efficiency of the first light generating device.

[0172] The layer stack of the first luminescent converter may further comprise a tertiary first luminescent converter layer. In such embodiments, the tertiary first luminescent converter layer may especially comprise the (first) narrowband luminescent material (wherein the primary first luminescent converter layer and the secondary first luminescent converter layer may be essentially free from (first) narrowband luminescent material). The tertiary first luminescent converter layer may have any position in the layer stack. Hence, in embodiments, the tertiary first luminescent converter layer may be configured upstream of the primary first luminescent converter layer and the secondary first luminescent converter layer. Alternatively, the tertiary first luminescent converter layer may be configured downstream of the primary first luminescent converter layer and the secondary first luminescent converter layer. Yet, especially, the tertiary first luminescent converter layer may be configured downstream of the primary first luminescent converter layer and upstream of the secondary first luminescent converter layer. Hence, in specific embodiments, the layer stack of the first luminescent converter may further comprise a tertiary first luminescent converter layer; wherein the tertiary first luminescent converter layer may comprise the first narrowband luminescent material; and wherein the tertiary first luminescent converter layer may be configured downstream of the primary first luminescent converter layer and upstream of the secondary first luminescent converter layer. The (first) narrowband luminescent material may be relatively susceptible to photodegradation and / or oxidation (e.g. due to exposure to moisture and / or air). Hence, configuring the tertiary first luminescent converter layer between the primary first luminescent converter layer and the secondary first2024PF80392

[0173] 45

[0174] luminescent converter layer may facilitate protecting the (first) narrowband luminescent material against high-intensity light with the primary first luminescent converter layer, and against moisture and / or oxygen with the secondary first luminescent converter layer, thereby extending the lifetime of the first light generating device.

[0175] Additionally or alternatively, the (second) green-yellow luminescent material, the (second) broadband luminescent material, and the (second) narrowband luminescent material may be configured evenly dispersed throughout the second luminescent converter. Alternatively, one or more of the (second) green-yellow luminescent material, the (second) broadband luminescent material, and the (second) narrowband luminescent material may be present in a gradient in the second luminescent converter (wherein the gradient may especially be along a direction of an optical axis of the second light source light through the second luminescent converter). Further, in embodiments, the second luminescent converter may comprise a layer stack. The layer stack may comprise a primary second luminescent converter layer and a secondary second luminescent converter layer. In embodiments, the secondary second luminescent converter layer may be configured downstream of the primary second luminescent converter layer. Further, the secondary second luminescent converter layer may be configured in physical contact with the primary second luminescent converter layer. Alternatively, the secondary second luminescent converter layer may be configured physically separated from the primary second luminescent converter layer, such as separated by a second non-zero distance d2, wherein the second non-zero distance d2 may be selected from the same range as di (see above). In embodiments, the primary second luminescent converter layer may comprise > 80%, such as > 90%, especially > 95%, like > 98%, including (essentially) 100%, of the (second) broadband luminescent material. Further, the secondary second luminescent converter layer may comprise > 80%, such as > 90%, especially > 95%, like > 98%, including (essentially) 100%, of the (second) green-yellow luminescent material. In embodiments, one or more of the primary second luminescent converter layer and the secondary second luminescent converter layer may comprise the (second) narrowband luminescent material. Hence, in embodiments, the (second) narrowband luminescent material may be distributed over the primary second luminescent converter layer and the secondary second luminescent converter layer, wherein each converter layer may comprise selected from the range of 20-80%, such as 10-90%, especially 5-95%, of the (second) narrowband luminescent material. Alternatively, the primary second luminescent converter layer may comprise > 80%, such as > 90%, especially > 95%, like > 98%, including (essentially) 100%, of the (second) narrowband luminescent material. Yet, in other2024PF80392

[0176] 46

[0177] embodiments, the secondary second luminescent converter layer may comprise > 80%, such as > 90%, especially > 95%, like > 98%, including (essentially) 100%, of the (second) narrowband luminescent material. Hence, in specific embodiments, the second luminescent converter may comprise a layer stack comprising a primary second luminescent converter layer and a secondary second luminescent converter layer; wherein the secondary second luminescent converter layer may be configured downstream of the primary second luminescent converter layer; wherein the primary second luminescent converter layer may comprise > 90% of the second broadband luminescent material; wherein the secondary second luminescent converter layer may comprise > 90% of the second green-yellow luminescent material; and wherein one or more of the primary second luminescent converter layer and the secondary second luminescent converter layer may comprise the second narrowband luminescent material. Such a layer stack may facilitate reducing the amount of (second) green-yellow luminescent material light absorbed and converted by the (second) broadband luminescent material, thereby increasing the efficiency of the second light generating device.

[0178] The layer stack of the second luminescent converter may further comprise a tertiary second luminescent converter layer. In such embodiments, the tertiary second luminescent converter layer may especially comprise the (second) narrowband luminescent material (wherein the primary second luminescent converter layer and the secondary second luminescent converter layer may be essentially free from (second) narrowband luminescent material). The tertiary second luminescent converter layer may have any position in the layer stack. Hence, in embodiments, the tertiary second luminescent converter layer may be configured upstream of the primary second luminescent converter layer and the secondary second luminescent converter layer. Alternatively, the tertiary second luminescent converter layer may be configured downstream of the primary second luminescent converter layer and the secondary second luminescent converter layer. Yet, especially, the tertiary second luminescent converter layer may be configured downstream of the primary second luminescent converter layer and upstream of the secondary second luminescent converter layer. Hence, in specific embodiments, the layer stack of the second luminescent converter may further comprise a tertiary second luminescent converter layer; wherein the tertiary second luminescent converter layer may comprise the second narrowband luminescent material; and wherein the tertiary second luminescent converter layer may be configured downstream of the primary second luminescent converter layer and upstream of the secondary second luminescent converter layer. Configuring the tertiary second luminescent2024PF80392

[0179] 47

[0180] converter layer between the primary second luminescent converter layer and the secondary second luminescent converter layer may facilitate protecting the (second) narrowband luminescent material against high-intensity light with the primary second luminescent converter layer, and against moisture and / or oxygen with the secondary second luminescent converter layer, thereby extending the lifetime of the second light generating device.

[0181] As indicated above, the control system may be configured to individually control the first light generating device, the second light generating device, and the third light generating device. Further, the control system may be configured to determine a relative intensity of the system light in the wavelength range of 600-660 nm, such as especially in the wavelength range of 610-650 nm (wherein the relative intensity in said wavelength range may be determined relative to the intensity in the wavelength range of 380-780 nm). The control system may be configured to control the first light generating device, the second light generating device, and the third light generating device based on the relative intensity (in the wavelength range of 600-660 nm, such as the wavelength range of 610-650 nm). Especially, the control system may be configured to control the third light generating device based on the relative intensity (in the wavelength range of 600-660 nm, such as the wavelength range of 610-650 nm). Hence, in specific embodiments, the control system may be configured to determine a relative intensity of the system light in the wavelength range of 610-650 nm, wherein the control system may be configured to control the third light generating device based on the relative intensity. Such a control system may facilitate that, would the relative intensity of the system light in the wavelength range of 610-650 nm decrease due to e.g. degradation or quenching of the narrowband luminescent material, the control system may compensate the decreased intensity by increasing a relative contribution of the third device light to the system light, thereby facilitating that a CCT and / or CRI of the system light may be maintained (at a predetermined value).

[0182] Hence, the control system may be configured to determine a relative intensity of the system light in the wavelength range of 600-660 nm, such as especially in the wavelength range of 610-650 nm. Further, the control system may be configured to determine a relative contribution of the narrowband luminescent material light to the system light. Further yet, the control system may be configured to determine a relative contribution of the first narrowband luminescent material light to the first device light. Additionally or alternatively, the control system may be configured to determine a relative contribution of the second narrowband luminescent material light to the second device light. Additionally or alternatively, the control system may be configured to determine a relative contribution of the2024PF80392

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[0184] third narrowband luminescent material light to the third device light. In embodiments, (in an operational mode of the light generating system,) the light generating system may have a predetermined (target) contribution of the (combined) narrowband luminescent material light to the system light. The predetermined (target) contribution may be based on a user input (e.g. from a user interface communicatively coupled with the control system) and / or on a factory setting. In embodiments, the control system may be configured to maintain the predetermined contribution of the narrowband luminescent material light to the system light. Especially, the control system may be configured to maintain a predetermined contribution of the narrowband luminescent material light to the system light by individually controlling the first light generating device, the second light generating device, and the third light generating device, such as at least the third light generating device. Hence, the control system may be configured to maintain a predetermined contribution of the narrowband luminescent material light to the system light by controlling the third light generating device. Additionally or alternatively, the control system may be configured to maintain a predetermined contribution of the narrowband luminescent material light to the system light by varying the amount of third device light generated by the third light generating device (and therefore the amount of third device light admixed into the system light). Hence, in specific embodiments, the control system may be configured to determine a relative contribution of the narrowband luminescent material light to the system light; wherein the control system may be configured to maintain a predetermined contribution of the narrowband luminescent material light to the system light by controlling and varying the amount of third device light generated by the third light generating device. Such a control system may facilitate monitoring a performance and / or condition of the (first, second, and / or third) narrowband luminescent material. Further, such a control system may facilitate compensating a decrease in relative intensity of the narrowband luminescent material light in the first device light and / or second device light by increasing a relative contribution of the third device light to the system light.

[0185] Hence, the light generating system may have a predetermined (target) contribution of the (combined) narrowband luminescent material light to the system light. Additionally or alternatively, the light generating system may have a predetermined (target) CCT and / or CRI (originating from a user input and / or a factory setting). In embodiments, the control system may be configured to control a relative contribution of one or more of the green-yellow luminescent material light, broadband luminescent material light, and narrowband luminescent material light to the system light to maintain the predetermined (target) CCT and / or CRI. Hence, at a predetermined CCT and / or CRI, the control system2024PF80392

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[0187] may be configured to control a contribution of one or more of the green-yellow luminescent material light, broadband luminescent material light, and narrowband luminescent material light to the system light. Especially, at a predetermined CCT and / or CRI, the control system may be configured to control a contribution of the narrowband luminescent material light to the system light. Further, the control system may be configured to determine a contribution of the first narrowband luminescent material light and the second narrowband luminescent material light to the system light, wherein, upon detecting a decrease in the contribution of the first narrowband luminescent material light and / or the second narrowband luminescent material light to the system light, the control system may be configured to increase an intensity of the third device light to maintain a predetermined CCT and / or CRI. Additionally or alternatively, at a predetermined CCT and / or CRI, the control system may be configured to control a contribution of one or more of the first device light, second device light, and third device light to the system light.

[0188] In embodiments, the control system may be configured to control a contribution of one or more of the green-yellow luminescent material light, broadband luminescent material light, and narrowband luminescent material light to the system light (by individually controlling the first light generating device, second light generating device, and third light generating device) on the basis of a look-up table. Further, the control system may be configured to determine the relative contribution of the narrowband luminescent material light to the system light using a look-up table. Especially, the control system may comprise a look-up table, wherein the look-up table may provide a correlation between e.g. operating time of the first light generating device and / or second light generating device and relative contribution of the narrowband luminescent material light to the respective first device light and / or second device light, wherein the control system may be configured to control (especially increase) a relative intensity of the third device light in the system light based on the operating time and the related information from the look-up table. For instance, during operation of the first (and / or second) light generating device, a relative contribution of the narrowband luminescent material light to the first (and / or second) device light may decrease (e.g. due to thermal quenching and / or degradation), thereby decreasing the relative contribution of the narrowband luminescent material light to the system light, and the control system may be configured to increase a relative intensity of the third device light in the system light to compensate for the loss of narrowband luminescent material light from the first (and / or second) device light (wherein the control system may determine a degree to2024PF80392

[0189] 50

[0190] which the relative intensity of the third device light should be increased using the look-up table).

[0191] Additionally or alternatively, the light generating system may comprise a light sensor. The light sensor may be configured to determine a relative contribution of the narrowband luminescent material light to the system light. Additionally or alternatively, the first light generating device may comprise a first light sensor configured to determine a relative contribution of the first narrowband luminescent material light to the first device light. Additionally or alternatively, the second light generating device may comprise a second light sensor configured to determine a relative contribution of the second narrowband luminescent material light to the second device light. Hence, the control system may be configured to determine the relative contribution of the narrowband luminescent material light using a light sensor. In such embodiments, the control system may be configured to (control, especially) increase a relative intensity of the third device light in the system light upon determining (using the light sensor and / or the look-up table) a decrease in the relative contribution of the narrowband luminescent material light to the system light. Hence, in specific embodiments, the control system may be configured to determine the relative contribution of the narrowband luminescent material light using one or more of a light sensor and a look-up table; wherein the control system may be configured to increase a relative intensity of the third device light in the system light upon determining a decrease in the relative contribution of the narrowband luminescent material light to the system light. In embodiments, using a light sensor to determine the relative contribution may provide relatively more reliable data. Yet, using a look-up table may facilitate reducing the complexity of and number of components in the light generating system, thereby providing a more compact light generating system.

[0192] In embodiments, the light generating system may further comprise a fourth light generating device. The fourth light generating device may comprise a fourth solid state light source. In embodiments, the fourth solid state light source may be selected from the group comprising an LED, a laser diode, a superluminescent diode, and a (stacked) multijunction light emitting diode, though other options may also be possible (see below). Further, the fourth solid state light source may be configured to generate fourth light source light having a fourth peak emission wavelength (λp4). In embodiments, the fourth peak emission wavelength (λp4) may be selected from the range of 380-500 nm, such as from the range of 380-490 nm, especially from the range of 400-490 nm, like from the range of 430-490 nm, more especially from the range of 445-470 nm.2024PF80392

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[0194] Further, the fourth light generating device may comprise a fourth luminescent converter. The fourth luminescent converter may be configured in a light receiving relationship with the fourth solid state light source. Further, the fourth luminescent converter may comprise a fourth green-yellow luminescent material. The fourth green-yellow luminescent material may especially comprise one or more of the luminescent materials indicated above for the (first and / or second) green-yellow luminescent material. That is, the fourth green-yellow luminescent material may comprise a luminescent material of the type A3B5O12:Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc. The fourth green-yellow luminescent material may be configured to convert at least part of the fourth light source light received by the fourth green-yellow luminescent material into fourth green-yellow luminescent material light. Further, the fourth green-yellow luminescent material may be configured to convert at least part of the fourth light source light received by the fourth luminescent converter into fourth green-yellow luminescent material light. In embodiments, the fourth green-yellow luminescent material may be configured to convert < 98%, such as < 95%, especially < 90%, of the fourth light source light received by the fourth luminescent converter into fourth greenyellow luminescent material light. Yet, especially, the fourth green-yellow luminescent material may be configured to convert > 85%, such as > 90%, especially > 95%, like > 98%, including (essentially) 100%, of the fourth light source light received by the fourth luminescent converter into fourth green-yellow luminescent material light.

[0195] The fourth green-yellow luminescent material light may have a fourth greenyellow centroid wavelength (λcg4). In embodiments, the fourth green-yellow centroid wavelength (λcg4) may be selected from the range of 480-600 nm, such as from the range of 490-590 nm, especially from the range of 500-580 nm, like from the range of 500-570 nm. Hence, the fourth green-yellow luminescent material light may comprise, such as be, one or more of green light and yellow light, such as especially green light. Further, the fourth greenyellow luminescent material light may comprise at least one emission band having a fourth green-yellow full width at half maximum FWHMg4 of > 40 nm, such as > 50 nm, especially > 60 nm, like > 70 nm. Additionally or alternatively, the fourth green-yellow luminescent material light may comprise the at least one emission band having the fourth green-yellow full width at half maximum FWHMg4 of < 200 nm, such as < 175 nm, especially < 150 nm. In embodiments, the fourth green-yellow luminescent material light may comprise a plurality of emission bands, wherein at least one band may have the fourth green-yellow full width at half maximum FWHMg4. Additionally or alternatively, the fourth green-yellow luminescent2024PF80392

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[0197] material light may comprise a single emission band, wherein said emission band may have the fourth green-yellow full width at half maximum FWHMg4

[0198] The fourth light generating device may be configured to generate fourth device light. In embodiments, the fourth device light may comprise, such as consist of, the fourth green-yellow luminescent material light. Especially, in embodiments, the fourth device light may have a spectral power distribution, wherein > 85%, such as > 90%, especially > 95%, like > 98%, including (essentially) 100%, of the spectral power in the wavelength range of 380-780 nm may be provided by the fourth green-yellow luminescent material light. In such embodiments, the fourth device light may especially have a fourth device centroid wavelength (λcd4) selected from the range of 480-600 nm, such as from the range of 490-590 nm, especially from the range of 500-580 nm, like from the range of 500-570 nm. That is, the fourth device light may comprise, such as be, one or more of green light and yellow light, such as especially green light. Hence, in specific embodiments, the fourth light generating device may comprise a fourth solid state light source and a fourth luminescent converter; wherein the fourth solid state light source may be configured to generate fourth light source light having a fourth peak emission wavelength (λp4) selected from the range of 380-490 nm; wherein the fourth luminescent converter may be configured in a light receiving relationship with the fourth solid state light source; wherein the fourth luminescent converter may comprise a fourth green-yellow luminescent material; wherein the fourth green-yellow luminescent material may be configured to convert at least part of the fourth light source light received by the fourth green-yellow luminescent material into fourth green-yellow luminescent material light; wherein the fourth green-yellow luminescent material light may have a fourth green-yellow centroid wavelength (λcg4) selected from the range of 490-590 nm; and wherein the fourth device light may comprise the fourth green-yellow luminescent material light. Such a fourth light generating device, providing especially green light using a fourth green-yellow luminescent material, may be relatively more efficient than a fourth light generating device comprising a fourth solid state light source providing green light.

[0199] Hence, the light generating system may comprise a fourth light generating device, configured to generate fourth device light. In embodiments, the system light may comprise the fourth device light. Further, the control system may be configured to control the fourth light generating device. Especially, the control system may be configured to control, in an operational mode of the light generating system, a spectral power distribution of the system light in the wavelength range of 380-780 nm by (individually) controlling the first light generating device, the second light generating device, the third light generating device,2024PF80392

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[0201] and the fourth light generating device. Hence, in specific embodiments, the light generating system may further comprise a fourth light generating device; wherein the fourth light generating device may be configured to generate fourth device light; wherein the fourth device light may have a fourth device centroid wavelength (λcd4) selected from the range of 490-590 nm; and wherein the control system may be configured to control, in an operational mode of the light generating system, a spectral power distribution of the system light in the wavelength range of 380-780 nm by controlling the first light generating device, the second light generating device, the third light generating device, and the fourth light generating device. A light generating system further comprising a (green) fourth light generating device may facilitate that the color point of the system light may be adjusted over a larger color gamut. Further, such a light generating system may facilitate providing system light with a higher CCT and / or CRI. Hence, such a light generating system may especially be more versatile.

[0202] The light generating system may further comprise a fifth light generating device. The fifth light generating device may comprise a fifth solid state light source. In embodiments, the fifth solid state light source may be selected from the group comprising an LED, a laser diode, a superluminescent diode, and a (stacked) multi -junction light emitting diode, though other options may also be possible (see below). Further, the fifth solid state light source may be configured to generate fifth light source light having a fifth peak emission wavelength (Xps). In embodiments, the fifth peak emission wavelength (Xps) may be selected from the range of 380-500 nm, such as from the range of 380-490 nm, especially from the range of 400-490 nm, like from the range of 430-490 nm, more especially from the range of 445-470 nm.

[0203] Further, the fifth light generating device may be configured to generate fifth device light. In embodiments, the fifth device light may comprise, such as consist of, the fifth light source light. Especially, in embodiments, the fifth device light may have a spectral power distribution, wherein > 90%, such as > 95%, especially > 98%, including (essentially) 100%, of the spectral power in the wavelength range of 380-780 nm may be provided by the fifth light source light. Further, the fifth device light may have a fifth device centroid wavelength (Leas). In embodiments, the fifth device centroid wavelength (Leas) may be selected from the range of 380-500 nm, such as from the range of 380-490 nm, especially from the range of 400-490 nm, like from the range of 430-490 nm, more especially from the range of 445-470 nm. That is, the fifth device light may comprise, such as be, one or more of violet light and blue light, such as especially blue light. Hence, in specific embodiments, the2024PF80392

[0204] 54

[0205] fifth light generating device may comprise a fifth solid state light source; wherein the fifth solid state light source may be configured to generate fifth light source light having a fifth peak emission wavelength (Xps) selected from the range of 430-490 nm; and wherein the fifth device light may comprise at least part of the fifth light source light. Such a fifth light generating device may especially provide blue light, thereby facilitating admixing blue light into the system light.

[0206] Hence, the light generating system may comprise a fifth light generating device, configured to generate fifth device light. In embodiments, the system light may comprise the fifth device light. Further, the control system may be configured to control the fifth light generating device. Especially, the control system may be configured to control, in an operational mode of the light generating system, a spectral power distribution of the system light in the wavelength range of 380-780 nm by (individually) controlling the first light generating device, the second light generating device, the third light generating device, the fifth light generating device, and optionally the fourth light generating device. Hence, in specific embodiments, the light generating system may further comprise a fifth light generating device; wherein the fifth light generating device may be configured to generate fifth device light; wherein the fifth device light may have a fifth device centroid wavelength (Zeds) selected from the range of 430-490 nm; and wherein the control system may be configured to control, in an operational mode of the light generating system, a spectral power distribution of the system light in the wavelength range of 380-780 nm by controlling the first light generating device, the second light generating device, the third light generating device, the fifth light generating device, and optionally the fourth light generating device. A light generating system further comprising a (blue) fifth light generating device may facilitate that the color point of the system light may be adjusted over a larger color gamut. Further, such a light generating system may facilitate providing system light with a higher CCT and / or CRI. Hence, such a light generating system may especially be more versatile.

[0207] In embodiments, the light generating system may comprise a LED package. The term “LED package” may refer to a housing comprising a solid state light source (e.g. a semiconductor chip) and one or more further (optical and / or electrical) components, such as a luminescent converter, a reflector, a carrier, one or more optical elements (e.g. a lens, a dome, a diffuser, etc.), electrical connective elements (e.g. wiring), a heat sink, a Zener diode, etc.. Especially, the LED package (of the light generating system) may comprise a solid state light source and a luminescent converter. Optionally, the LED package (of the light generating system) may further comprise one or more of a reflector, a carrier, one or2024PF80392

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[0209] more optical elements (e.g. a lens, a dome, a diffuser, etc.), electrical connective elements (e.g. wiring), a heat sink, a Zener diode, and one or more further optical and / or electrical components. In embodiments, the LED package may at least comprise a reflective cup.

[0210] The term “LED package” may in general language usage also be indicated as simply “LED”. That is, in general language usage, the term “LED” may be used to refer to a LED package. In embodiments, a LED package may comprise a solid state light source (e.g. a semiconductor chip) configured to provide primary radiation, which is used as such, such as e.g. a blue light source, like a blue LED. Such an LED (package), which may not comprise a luminescent material, may be indicated as a direct-color LED (dc-LED). Alternatively, the LED package may comprise a solid state light source configured to provide primary radiation, wherein at least part of the primary radiation may be converted into secondary radiation (e.g. by a luminescent material) within the LED package. Such an LED (package) may especially be indicated as a phosphor converted LED or pc-LED. Herein, the LED package (comprising a solid state light source and a luminescent converter) may especially be based on the conversion of light source light by one or more luminescent materials. Hence, the LED package may be a pc-LED.

[0211] Hence, the light generating system may comprise a LED package. The LED package may comprise the first light generating device, the second light generating device, and the third light generating device. Optionally, the LED package may further comprise one or more of the fourth light generating device and the fifth light generating device. In embodiments, each of the first light generating device, second light generating device, and third light generating device (and optional fourth light generating device and / or fifth light generating device) may be configured as a (separate) LED package. Alternatively, the first light generating device, the second light generating device, and the third light generating device (and optional the fourth light generating device and / or the fifth light generating device) may be configured in a (single) LED package. In embodiments, a LED package may comprise multiple sub-packages, wherein each sub-package may be a LED package as described above. Hence, the light generating system may comprise a LED package comprising the first light generating device, the second light generating device, and the third light generating device (and optionally the fourth light generating device and / or the fifth light generating device). In such embodiments, as indicated above, each of the first light generating device, the second light generating device, and the third light generating device (and optionally the fourth light generating device and / or the fifth light generating device) may be configured as a (separate) LED package, wherein the (separate) LED packages may2024PF80392

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[0213] together form a (larger) LED package. Hence, a LED package may comprise one or more LED (sub-)packages. Alternatively, a LED package may comprise one or more compartments, wherein each compartment may comprise a light generating device (wherein the light generating devices on their own may not be configured as a LED package). Hence, in specific embodiments, the light generating system may comprise a LED package, wherein the LED package may comprise the first light generating device, the second light generating device, and the third light generating device. Such a LED package may be relatively compact. Further, such a LED package may facilitate providing system light with a relatively high intensity.

[0214] In alternative embodiments, the light generating system may comprise a Chip-on-Board (CoB). The term “CoB” may especially refer to LED chips in the form of a semiconductor chip that is neither encased nor connected but directly mounted onto a substrate, such as a PCB. Hence, a plurality of light emitting semiconductor light sources may be configured on the same substrate. Especially, a CoB may be a multi-LED chip configured together as a single lighting module. In embodiments, the Chip-on-Board (CoB) of the light generating system may comprise a plurality of the first solid state light source. Especially, the CoB may comprise > 2, such as > 3, especially > 4, first solid state light sources. Additionally or alternatively, the CoB may comprise < 200, such as < 150, especially < 100, first solid state light sources. Further, the CoB may comprise the first luminescent converter. The first luminescent converter may especially be configured on top of the plurality of first solid state light sources. Further, the CoB of the light generating system may comprise a plurality of the second solid state light source. Especially, the CoB may comprise > 2, such as > 3, especially > 4, second solid state light sources. Additionally or alternatively, the CoB may comprise < 200, such as < 150, especially < 100, second solid state light sources. Further, the CoB may comprise the second luminescent converter. The second luminescent converter may especially be configured on top of the plurality of second solid state light sources. Additionally, the CoB of the light generating system may comprise a plurality of the third solid state light source. Especially, the CoB may comprise > 2, such as > 3, especially > 4, third solid state light sources. Additionally or alternatively, the CoB may comprise < 200, such as < 150, especially < 100, third solid state light sources. Further, the CoB may comprise the third luminescent converter. The third luminescent converter may especially be configured on top of the plurality of third solid state light sources. Optionally, the CoB of the light generating system may comprise a plurality of the fourth (and / or fifth) solid state light source. Especially, the CoB may comprise > 2, such as > 3, especially > 4,2024PF80392

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[0216] fourth (and / or fifth) solid state light sources. Additionally or alternatively, the CoB may comprise < 200, such as < 150, especially < 100, fourth (and / or fifth) solid state light sources. Further, the CoB may comprise the fourth luminescent converter. The fourth luminescent converter may especially be configured on top of the plurality of fourth solid state light sources. Hence, in specific embodiments, the light generating system may comprise a Chip-on-Board, wherein the Chip-on-Board may comprise (i) a plurality of the first solid state light source and the first luminescent converter, wherein the first luminescent converter may be configured on top of the plurality of first solid state light sources, (ii) a plurality of the second solid state light source and the second luminescent converter, wherein the second luminescent converter may be configured on top of the plurality of second solid state light sources, and (iii) a plurality of the third solid state light source and the third luminescent converter, wherein the third luminescent converter may be configured on top of the plurality of third solid state light sources. A CoB may be relatively compact. Further, a CoB may facilitate that a plurality of solid state light sources may share a luminescent converter.

[0217] (Additionally or) alternatively, the light generating system may comprise a LED filament. LED filaments as such are known, and are e.g. described in US8400051B2, W02020016058, WO2019197394, etc., which are herein incorporated by reference. In general, a LED filament may comprise (i) a plurality of LEDs, arranged on (at least a first major surface of) an elongated carrier, and (ii) an elongated encapsulant covering the plurality of LEDs and at least part of the elongated carrier. The LED filament may in embodiments be defined by a filament length LF, a filament width WF, and a filament thickness TF. Further, the LED filament may have relatively high aspect ratios (LF / WF or LF / TF), such as > 10, especially > 15, such as > 20, more especially > 50. Yet, in embodiments, the aspect ratio (LF / WF and / or LF / TF) may be < 900, such as < 650, especially < 500. Hence, in embodiments, 10*WF< LF< 900*WF, and 10*TF< LF< 900*TF may apply. In embodiments, the LED filament may be straight. Alternatively, the LED filament may be curved. For instance, the filament may have a (2D or 3D) spiraling shape, (like) a helical shape, or another curved shape.

[0218] As indicated, the LED filament may comprise an elongated carrier, solid state light sources, and an encapsulant. Especially, the elongated carrier may support the solid state light sources. The elongated carrier may e.g. comprise glass, quartz, metal, or sapphire. In other embodiments, the elongated carrier may e.g. comprise a polymeric material or (flexible) metal, e.g., a film or foil. The elongated carrier may be rigid (self-supporting), but may (in polymeric embodiments) also be flexible. In embodiments, the elongated carrier may2024PF80392

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[0220] be light transmissive, translucent, or transparent for light, especially visible light.

[0221] Alternatively, in embodiments, the carrier may be light reflective, especially reflective for one or more of light source light and luminescent material light, such as reflective for at least light source light and luminescent material light. In specific embodiments, the carrier may be diffuse reflective. In embodiments, the (elongated) carrier may comprise a first major surface at a first side of the carrier and a second major surface at a second side of the carrier, opposite to the first side. In embodiments, the solid state light sources may be arranged on at least one of these surfaces. Hence, in embodiments, at least part of, such as all of, the solid state light sources may be mounted onto the first major surface. Additionally or alternatively, at least part of the solid state light sources may be mounted onto the second major surface. Hence, in embodiments, the solid state light sources may be arranged, mounted and / or mechanically coupled on / to the carrier, wherein the carrier may especially be configured to mechanically and / or electrically support the LEDs.

[0222] In embodiments, the solid state light sources may comprise one or more of LEDs, laser diodes, superluminescent diodes, and stacked multi -junction LEDs. Especially, the LED filament may comprise a plurality of LEDs. The (plurality of) solid state light sources may be arranged in an array (on the elongated carrier), especially over at least part of the filament length LF. The number of solid state light sources in the array may be > 4, such as > 8, especially > 12. In embodiments, the number of solid state light sources in the array may be selected from the range of 10-2000, such as from the range of 10-1500, especially from the range of 10-1000. In embodiments, the solid state light sources may be configured in a ID (linear) array over at least part of the filament length LF. A first and a last solid state light source may, when measured along the LED filament, have a mutual distance of > 0.5*LF, such as > 0.7*LF. Further, the solid state light sources may be configured in two ID arrays, one on the first major surface of the elongated carrier and one on the second major surface. A 2D array of solid state light sources of n*m LEDs may also be possible. In embodiments, n may be selected from the range of 1-4, such as 1-3, like 1-2, such as 1 or such as 2, and m may be selected from the range of larger than n, such as especially selected from the range of > 4 (when n < 4), like > 6, such as > 8. Hence, a 2D array of solid state light sources may have a (much) smaller number of rows (n) than the number of solid state light sources in those respective rows (m), such as n / m < 0.2, like n / m <0.1, especially n / m < 0.05. Especially, in embodiments, the elongated carrier may be light transparent, wherein the solid state light sources may be configured on one or more of the first major surface and the second major surface. Alternatively, the elongated carrier may be light reflective, wherein the2024PF80392

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[0224] solid state light sources may be configured on both the first major surface and the second major surface.

[0225] The LED filament may comprise an encapsulant. The encapsulant may (at least partly) cover the plurality of solid state light sources. Further, the encapsulant may cover at least part of the elongated carrier, such as at least (part of) one of the first major surface and the second major surface. In general, the encapsulant may be in contact with the elongated carrier and may cover all of the solid state light sources. Hence, the encapsulant may be configured over at least part of the filament length LF (such as over > 70% of the filament length LF). The encapsulant may be a continuous coating along the filament length LF, at one or both, such as especially both, of the first major and the second major surface. Further, the encapsulant may at least partly cover the solid state light sources, such as in embodiments > 50%, such as > 75%, especially > 95%, up to 100%, of the total number of solid state light sources in the array. In embodiments, the encapsulant configured on the first major surface may be different from the encapsulant configured on the second major surface, such as differ in one or more of a thickness and a luminescent material concentration. In embodiments, the encapsulant may comprise one or more of a luminescent material and a light scattering material. The one or more of the luminescent material and the light scattering material may especially be configured embedded in an encapsulant material, e.g. a (flexible) polymer material (such as a silicone). Especially, the encapsulant may comprise a luminescent converter. Further, a luminescent converter may be configured as the encapsulant. In embodiments, the (optional) light scattering material may be configured to scatter (or “diffuse”) the light source light, especially in a direction transverse to a normal of the (first and / or second) major surface. In specific embodiments, the light scattering material may comprise light scattering particles, e.g. at least one of BaSO4, Al2O3and TiO2particles.

[0226] Hence, the light generating system may comprise a LED filament. The LED filament (of the light generating system) may comprise the first light generating device, the second light generating device, and the third light generating device. Optionally, the LED filament (of the light generating system) may comprise the fourth light generating device and / or the fifth light generating device. In embodiments, each of the light generating devices may be configured as a sub-filament of the LED filament. That is, the LED filament may comprise one or more (especially at least three) sub-filaments, wherein each sub-filament may comprise a light generating device. The LED filament may comprise a plurality of the first solid state light source arranged on an elongated carrier. Further, the LED filament may comprise a first elongated encapsulant covering the plurality of first solid state light sources2024PF80392

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[0228] and at least part of the elongated carrier. In embodiments, the first elongated encapsulant may comprise the first luminescent converter. Further, the LED filament may comprise a plurality of the second solid state light source arranged on an elongated carrier. Additionally, the LED filament may comprise a second elongated encapsulant covering the plurality of second solid state light sources and at least part of the elongated carrier. In embodiments, the second elongated encapsulant may comprise the second luminescent converter. Further, the LED filament may comprise a plurality of the third solid state light source arranged on an elongated carrier. Additionally, the LED filament may comprise a third elongated encapsulant covering the plurality of third solid state light sources and at least part of the elongated carrier. In embodiments, the third elongated encapsulant may comprise the third luminescent converter. Optionally, the LED filament may further comprise a plurality of the fourth (and / or fifth) solid state light source arranged on an elongated carrier. Additionally, the LED filament may comprise a fourth (and / or fifth) elongated encapsulant covering the plurality of fourth (and / or fifth) solid state light sources and at least part of the elongated carrier. In embodiments, the fourth elongated encapsulant may comprise the fourth luminescent converter. Further, in embodiments, the fifth elongated encapsulant may comprise a light scattering material. Hence, in specific embodiment, the light generating system may comprise a LED filament, wherein the LED filament may comprise the first light generating device, the second light generating device, and the third light generating device. A LED filament may be suitable for light bulb applications, as a LED filament may better mimic a filament of an incandescent light bulb. Further, especially flexible LED filaments may be used in decorative lighting applications, to provide lighting solutions with various (adjustable) decorative shapes.

[0229] Some general embodiments relating to the light source will be provided next. These embodiments may relate to one or more of the first solid state light source, the second solid state light source, the third solid state light source, the fourth solid state light source, and the fifth solid state light source. The term “light source” may in principle relate to any light source known in the art. In a specific embodiment, the light source may comprise an LED. The term “light source” may also relate to a plurality of (essentially identical or different) light sources, such as 2-2000 (LED) light sources. The phrase “different light sources”, and similar phrases, may refer to a plurality of solid-state light sources selected from at least two different bins. Likewise, the phrase “identical light sources”, and similar phrases, may refer to a plurality of solid-state light sources selected from the same bin.

[0230] Hence, the term LED may also refer to a plurality of LEDs. Further, the term “light source”2024PF80392

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[0232] may also refer to a so-called chip-on-board (CoB) light source. The term “light source” may also refer to a chip scale package (CSP) and / or a chip scale packaged (CSP) LED. A CSP may comprise a single solid state die (such as a LED) with provided thereon a luminescent material comprising layer. The term “light source” may also refer to a midpower package. A midpower package may comprise one or more solid state die(s). The die(s) may be covered by a luminescent material comprising layer. The die dimensions may be equal to or smaller than 2 mm, such as in the range of e.g. 0.2-2 mm. Herein, the term “light source” may also especially refer to a small solid state light source, such as having a mini size or micro size. For instance, the light sources may comprise one or more of mini LEDs and micro LEDs, such as especially micro LEDs or “microLEDs” or “pLEDs”. Herein, the term mini size or mini LED especially refers to solid state light sources having dimensions, such as die dimension, especially length and width, selected from the range of 100 pm - 1 mm. Herein, the term μ size or micro LED especially refers to solid state light sources having dimensions, such as die dimension, especially length and width, selected from the range of 100 pm and smaller.

[0233] The light source may have a light escape surface. For LEDs it may for instance be the LED die, or when a resin is applied to the LED die, the outer surface of the resin. The term escape surface especially relates to that part of the light source, where the light actually leaves or escapes from the light source. The light source is configured to provide a beam of light. This beam of light (thus) escapes from the light exit surface of the light source.

[0234] The term “light source” may refer to a semiconductor light-emitting device, such as an LED, a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSELs), an edge emitting laser, etc... The term “light source” may also refer to an organic light-emitting diode (OLED), such as a passive-matrix (PMOLED) or an active-matrix (AMOLED). In an embodiment, the light source comprises a LED. The terms “light source” or “solid state light source” may also refer to a superluminescent diode (SLED). Especially, the term “solid state light source” may refer to semiconductor light sources, such as a light emitting diode (LED), a laser diode, a superluminescent diode, or a multi -junction diode.

[0235] The light source may comprise one or more micro-optical elements (array of micro lenses) downstream of a single solid-state light source, or downstream of a plurality of solid-state light sources (i.e. e.g. shared by multiple LEDs). In embodiments, the light source may comprise a LED with on-chip optics. The light source may comprise pixelated single LEDs (with or without optics) (offering in embodiments on-chip beam steering). In embodiments, the light source may be a dc-LED. Alternatively, the light source may be a pc-2024PF80392

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[0237] LED. Hence, the term “light source” may refer to a light generating element as such, like e.g. a solid state light source, or e.g. to a package of the light generating element, such as a solid state light source, and one or more optics, like a lens, a collimator. In embodiments, the term “light source” may also refer to a combination of a light source, like an LED, and an optical filter, which may change the spectral power distribution of the light generated by the light source. In specific embodiments, the light source may be selected from the group of laser diodes and superluminescent diodes. In other embodiments, the light source may comprise an LED or multi -junction (light emitting) diode. The light source may especially be configured to generate light source light having an optical axis (O), (a beam shape,) and a spectral power distribution. The light source light may in embodiments comprise one or more bands, having band widths as known for lasers.

[0238] The term “laser light source” especially refers to a laser. Such laser may especially be configured to generate laser light source light having one or more wavelengths in the UV, visible, or infrared, especially having a wavelength selected from the wavelength range of 200-2000 nm, such as from the wavelength range of 300-1500 nm. The term “laser” especially refers to a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. Especially, the term “laser” may refer to a solid-state laser. In specific embodiments, the terms “laser” or “laser light source”, or similar terms, may refer to a laser diode (or diode laser). Hence, in embodiments the light source comprises a laser light source. In embodiments, the terms “laser” or “solid state laser” or “solid state material laser” may refer to one or more of a semiconductor laser diodes, such as GaN, InGaN, AlGalnP, AlGaAs, InGaAsP, lead salt, vertical cavity surface emitting laser (VCSEL), quantum cascade laser, hybrid silicon laser, etc. The term “solid state material laser”, and similar terms, may thus refer to a solid state laser like based on a crystalline or glass body dopes with ions, like transition metal ions and / or lanthanide ions, to a fiber laser, to a photonic crystal laser, to a semiconductor laser, etc.

[0239] The light generating system may further be part of or may be applied in e.g. office lighting systems, household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems (e.g. a torch), automotive lighting devices, stage-lighting devices, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, digital projection, or2024PF80392

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[0241] LCD backlighting. The light generating system (or luminaire) may be part of or may be applied in e.g. optical communication systems or disinfection systems.

[0242] In yet a further aspect, the invention also provides a lamp or a luminaire comprising the light generating system as defined herein. The luminaire may further comprise a housing, optical elements, louvres, etc.. The lamp or luminaire may further comprise a housing enclosing the light generating system. The lamp or luminaire may comprise a light window in the housing or a housing opening, through which the system light may escape from the housing. The lamp may be a portable lamp, such as a torch. In yet a further aspect, the invention also provides a projector device comprising the light generating system as defined herein. Especially, a projector device or “projector” or “image projector” may be an optical device that projects an image (or moving images) onto a surface, such as e.g. a projection screen. The projector device may include one or more light generating systems such as described herein. Further, the invention may provide one or more of a disinfection device, a photochemical reactor, an automotive lighting device, and an optical wireless communication device, comprising the light generating system as defined herein. Further, the invention may provide a lighting fixture, comprising the light generating system as defined herein. Hence, according to a further aspect, the invention provides a lighting device selected from the group of a lamp, a luminaire, a lighting fixture, a projector device, and an automotive lighting device, comprising the light generating system as defined herein. The lighting device may comprise a housing or a carrier, configured to house or support, one or more elements of the light generating system.

[0243] Hence, in a further aspect, the invention also provides (a lighting device selected from the group ol) a lighting fixture comprising the light generating system as defined herein. Hence, in yet a further aspect, the light generating system may comprise a lighting device selected from the group of a lamp, a luminaire, and a lighting fixture, wherein the lamp, luminaire, or lighting fixture may comprise one or more elements of the light generating system, such as the solid state light sources and the luminescent converter, and the light generating system may further comprise e.g. the control system configured to control the device.

[0244] The term “lighting fixture” may refer to a light emitting system like a moving head, a search light, a stage light, etc.. Generally these fixtures may have various control options for changing one or more of a direction of the light (e.g. via gimbals or rotary stages), a beam angle / width (e.g. via zoom optics), a beam pattern (e.g. via mechanical selection of a specific aperture that defines a virtual and patterned source for the further projection optics),2024PF80392

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[0246] the color point of the (system) light (e.g. via mechanical selection of a certain color filter), and of course a luminous flux, and mostly these may be remotely controllable.

[0247] The terms “light” and “radiation” are herein interchangeably used, unless clear from the context that the term “light” only refers to visible light. The terms “light” and “radiation” may thus refer to UV radiation, visible light, and IR radiation. In specific embodiments, especially for lighting applications, the terms “light” and “radiation” refer to (at least) visible light.

[0248] BRIEF DESCRIPTION OF THE DRAWINGS

[0249] Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which:

[0250] Fig. 1 schematically depicts an embodiment of the light generating system; Figs. 2A-B schematically depict embodiments of the first light generating device and the second light generating device;

[0251] Figs. 3A-B schematically depict an embodiment of the light generating system comprising a LED filament; and

[0252] Fig. 4 schematically depicts an embodiment of the lighting device. The schematic drawings are not necessarily to scale.

[0253] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0254] Fig. 1 schematically depicts an embodiment of the light generating system 1000. The light generating system 1000 may comprise a first light generating device 110, a second light generating device 120, a third light generating device 130, and a control system 3000. The first light generating device 110 may comprise a first solid state light source 10 and a first luminescent converter 2100. Especially, the first solid state light source 10 may be configured to generate first light source light 11 having a first peak emission wavelength (λp1) selected from the range of 380-490 nm. Further, the first luminescent converter 2100 may be configured in a light receiving relationship with the first solid state light source 10. The second light generating device 120 may comprise a second solid state light source 20 and a second luminescent converter 2200. The second solid state light source 20 may be configured to generate second light source light 21 having a second peak emission wavelength (λp2) selected from the range of 380-490 nm. Further, the second luminescent converter 2200 may be configured in a light receiving relationship with the second solid state2024PF80392

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[0256] light source 20. The third light generating device 130 may comprise a third solid state light source 30 and a third luminescent converter 2300. Especially, the third solid state light source 30 may be configured to generate third light source light 31 having a third peak emission wavelength (λp3) selected from the range of 380-490 nm. Further, the third luminescent converter 2300 may be configured in a light receiving relationship with the third solid state light source 30. Each of the first luminescent converter 2100, the second luminescent converter 2200, and the third luminescent converter 2300 may comprise a narrowband luminescent material 400. Further, the first luminescent converter 2100 and the second luminescent converter 2200 may each further comprise a green-yellow luminescent material 200 and a broadband luminescent material 300. The green-yellow luminescent material 200 may be configured to convert at least part of respectively the first light source light 11 and the second light source light 21 received by the green-yellow luminescent material 200 into green-yellow luminescent material light 201. Especially, the green-yellow luminescent material light 201 may have a green-yellow centroid wavelength (λcg) individually selected (for each of the first light generating device 110 and the second light generating device 120) from the range of 490-590 nm. Further, the broadband luminescent material 300 may be configured to convert at least part of (a) respectively the first light source light 11 and the second light source light 21 and / or (b) the green-yellow luminescent material light 201 received by the broadband luminescent material 300 into broadband luminescent material light 301. Especially, the broadband luminescent material light 301 may have a broadband centroid wavelength (λcb) individually selected (for each of the first light generating device 110 and the second light generating device 120) from the range of 600-670 nm. Further, the broadband luminescent material light 301 may comprise at least one emission band having a broadband full width at half maximum FWHMb of > 60 nm. The narrowband luminescent material 400 may be configured to convert at least part of respectively the first light source light 11, the second light source light 21, and the third light source light 31 received by the narrowband luminescent material 400 into narrowband luminescent material light 401.

[0257] Especially, the narrowband luminescent material light 401 may have a narrowband centroid wavelength (λcn) individually selected (for each of the first light generating device 110, the second light generating device 120, and the third light generating device 130) from the range of 610-650 nm. Further, the narrowband luminescent material light 401 may comprise at least one emission band having a narrowband full width at half maximum FWHMn of < 40 nm. The first light generating device 110 may be configured to generate first device light 111 comprising at least part of the first light source light 11, the green-yellow luminescent2024PF80392

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[0259] material light 201, the broadband luminescent material light 301, and the narrowband luminescent material light 401. The first device light 111 may especially be white light having a first correlated color temperature (CCTi). Further, the second light generating device 120 may be configured to generate second device light 121 comprising at least part of the second light source light 21, the green-yellow luminescent material light 201, the broadband luminescent material light 301, and the narrowband luminescent material light 401. The second device light 121 may especially be white light having a second correlated color temperature (CCT2). In embodiments, (CCT2 - CCTi) > 500 K may apply. Further, a relative spectral power of the broadband luminescent material light 301 in the second device light 121 may differ from a relative spectral power of the broadband luminescent material light 301 in the first device light 111. Additionally or alternatively, a relative spectral power of the narrowband luminescent material light 401 in the second device light 121 may differ from a relative spectral power of the narrowband luminescent material light 401 in the first device light 111. The third light generating device 130 may be configured to generate third device light 131 comprising the narrowband luminescent material light 401. Especially, the third device light 131 may have a third device centroid wavelength (λcd3) selected from the range of 610-650 nm. Further, the light generating system 1000 may be 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. The control system 3000 may be configured to control, in an operational mode of the light generating system 1000, a spectral power distribution of the system light 1001 in the wavelength range of 380-780 nm by individually controlling the first light generating device 110, the second light generating device 120, and the third light generating device 130. Especially, the system light 1001 (in said operational mode) may be white light having a correlated color temperature selected from the range of 2000-6500 K and a color rendering index of at least 80.

[0260] The first luminescent converter 2100 may comprise a green-yellow luminescent material 200, a broadband luminescent material 300, and a narrowband luminescent material 400. Especially, the first luminescent converter 2100 may comprise a first green-yellow luminescent material 210 (configured to generate first green-yellow luminescent material light 211), a first broadband luminescent material 310 (configured to generate first broadband luminescent material light 311), and a first narrowband luminescent material 410 (configured to generate first narrowband luminescent material light 411). Similarly, the second luminescent converter 2200 may comprise a second green-yellow luminescent material 220 (configured to generate second green-yellow luminescent material2024PF80392

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[0262] light 221), a second broadband luminescent material 320 (configured to generate second broadband luminescent material light 321), and a second narrowband luminescent material 420 (configured to generate second narrowband luminescent material light 421). Further, the third luminescent converter 2300 may comprise a third narrowband luminescent material 430 (configured to generate third narrowband luminescent material light 431). The first greenyellow luminescent material 210 and the second green-yellow luminescent material 220 may be of the same type. Additionally or alternatively, the first broadband luminescent material 310 and the second broadband luminescent material 320 may be of the same type. Further, additionally or alternatively, the first narrowband luminescent material 410, the second narrowband luminescent material 420, and the third narrowband luminescent material 430 may be of the same type.

[0263] Especially, (one or more, such as) each of the narrowband luminescent materials 400 (such as especially the first narrowband luminescent material 410, the second narrowband luminescent material 420, and the third narrowband luminescent material 430) may comprise a luminescent material of the type M’xM2-2xAXe: Mn4+, wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, germanium, tin, zinc, zirconium, and hafnium, and wherein X comprises a monovalent anion, at least comprising fluorine. Additionally or alternatively, (one or more, especially) each of the broadband luminescent materials 300 (such as especially the first broadband luminescent material 310 and the second broadband luminescent material 320) may comprise a luminescent material selected from the group of divalent europium comprising oxynitride luminescent materials, divalent europium comprising nitride luminescent materials, SiAlON phosphors, and luminescent materials of the type M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z: Eux, wherein M comprises one or more of Mg, Ca, Sr, and Ba, wherein 0 < x < 0.1, wherein 0 <y < 1, and wherein 0 < z < 0.1. Further, additionally or alternatively, (one or more, especially) each of the green-yellow luminescent materials 200 (such as especially the first green-yellow luminescent material 210 and the second green-yellow luminescent material 220) may comprise a luminescent material of the type A3B5O12: Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc.

[0264] The first luminescent converter 2100 may comprise the (first) broadband luminescent material 300(,310) in a first broadband concentration (Cbi). Further, the first luminescent converter 2100 may comprise the (first) narrowband luminescent material 400(,410) in a first narrowband concentration (Cni). In embodiments, Ri = Cbi / Cni. Further,2024PF80392

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[0266] the second luminescent converter 2200 may comprise the (second) broadband luminescent material 300(,320) in a second broadband concentration (Cb2). Additionally, the second luminescent converter 2200 may comprise the (second) narrowband luminescent material 400(,420) in a second narrowband concentration (Cn2). In embodiments, R2 = Cb2 / Cn2.

[0267] Further, in embodiments, R1 / R2 > 1.1. Additionally or alternatively, in embodiments, one or more may apply of 0.5 < Ri < 1 and 0.3 < R2 < 0.9.

[0268] The first device light 111 may have a color point (in the CIE 1931 color space) with a distance to the black body locus within 10 standard deviation of color matching.

[0269] Additionally or alternatively, the second device light 121 may have a color point (in the CIE 1931 color space) with a distance to the black body locus within 10 standard deviation of color matching. Further, the third device light 131 may have a spectral power distribution, wherein < 10% of the spectral power in the wavelength range of 380-780 nm may be provided by the third light source light 31.

[0270] In embodiments, the first peak emission wavelength (λp1). the second peak emission wavelength (λp2). and the third peak emission wavelength (λp3) may be individually selected from the range of (400-490 nm, especially from the range of) 445-470 nm.

[0271] Additionally or alternatively, one or more may apply of: (i) (0 < |λp1 - λp2| < 60 nm, especially) |λp1 - λp2| > 10 nm, (ii) (0 < |λp1 - λp3| < 60 nm, especially) |λp1 - λp3| > 10 nm, and (iii) (0 < |λp2 - λp3| < 60 nm, especially) |λp2 - λp3| > 10 nm.

[0272] In an operational mode of the light generating system 1000, the system light 1001 may have a spectral power distribution, wherein: (i) x1% of the spectral power in the wavelength range of 600-660 nm may be provided by the broadband luminescent material light 301, and (ii) x2% of the spectral power in the wavelength range of 600-660 nm may be provided by the narrowband luminescent material light 401. In embodiments, 0.5 < x1 / x2< 0.9 may apply. Further, the control system 3000 may be configured to control a ratio X1 / X2 by individually controlling the first light generating device 110, the second light generating device 120, and the third light generating device 130.

[0273] The control system 3000 may further be configured to determine a relative intensity of the system light 1001 in the wavelength range of 610-650 nm. Especially, the control system 3000 may be configured to control the third light generating device 130 based on the relative intensity. Additionally or alternatively, the control system 3000 may be configured to determine a relative contribution of the narrowband luminescent material light 401 to the system light 1001. Further, the control system 3000 may be configured to maintain a predetermined contribution of the narrowband luminescent material light 401 to the system2024PF80392

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[0275] light 1001 by controlling the third light generating device 130. Additionally or alternatively, the control system 3000 may be configured to maintain a predetermined contribution of the narrowband luminescent material light 401 to the system light 1001 by varying the amount of third device light 131 generated by the third light generating device 130.

[0276] The light generating system 1000 may further comprise a fourth light generating device 140. The fourth light generating device 140 may be configured to generate fourth device light 141. Especially, the fourth device light 141 may have a fourth device centroid wavelength (λcd4) selected from the range of 490-590 nm. Further, the control system 3000 may be configured to control, in an operational mode of the light generating system 1000, a spectral power distribution of the system light 1001 in the wavelength range of 380-780 nm by (individually) controlling the first light generating device 110, the second light generating device 120, the third light generating device 130, and the fourth light generating device 140. The fourth light generating device 140 may comprise a fourth solid state light source 40 and a fourth luminescent converter 2400. Especially, the fourth solid state light source 40 may be configured to generate fourth light source light 41 having a fourth peak wavelength (λp4) selected from the range of 380-490 nm. The fourth luminescent converter 2400 may be configured in a light receiving relationship with the fourth solid state light source 40. Further, the fourth luminescent converter 2400 may comprise a fourth greenyellow luminescent material 240. The fourth green-yellow luminescent material 240 may be configured to convert at least part of the fourth light source light 41 received by the fourth green-yellow luminescent material 240 into fourth green-yellow luminescent material light 241. Further, the fourth green-yellow luminescent material light 241 may have a fourth green-yellow centroid wavelength (λcg4) selected from the range of 490-590 nm. The fourth device light 141 may comprise the fourth green-yellow luminescent material light 241.

[0277] Additionally or alternatively, the light generating system 1000 may comprise a fifth light generating device 150. The fifth light generating device 150 may be configured to generate fifth device light 151. Especially, the fifth device light 151 may have a fifth device centroid wavelength (λcd5) selected from the range of 430-490 nm. Further, the control system 3000 may be configured to control, in an operational mode of the light generating system 1000, a spectral power distribution of the system light 1001 in the wavelength range of 380-780 nm by (individually) controlling the first light generating device 110, the second light generating device 120, the third light generating device 130, the fifth light generating device 150, and optionally the fourth light generating device 140. The fifth light generating device 150 may comprise a fifth solid state light source 50. The fifth solid state light source2024PF80392

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[0279] 50 may be configured to generate fifth light source light 51 having a fifth peak wavelength (λp5) selected from the range of 430-490 nm. Further, the fifth device light 151 may comprise at least part of the fifth light source light 51. In Fig. 1, for simplicity reasons only, the same solid state light source is indicated as the fourth solid state light source 40 and the fifth solid state light source 50. Further, the same light generating device is indicated as the fourth light generating device 140 and the fifth light generating device 150. It will be clear to the person skilled in the art that, would the light generating system 1000 comprise both the fourth light generating device 140 and the fifth light generating device 150, these light generating devices would be present as separate light generating devices in the light generating system 1000.

[0280] The light generating system 1000 may comprise a LED package 500. The LED package 500 may especially comprise the first light generating device 110, the second light generating device 120, and the third light generating device 130. Optionally, as indicated in Fig. 1, the LED package 500 may further comprise one or more of the fourth light generating device 140 and the fifth light generating device 150.

[0281] Fig. 2A schematically depicts a further embodiment of one or more of the first light generating device 110 and the second light generating device 120. Each of the first, second, and third light generating devices 110,120,130 may be configured as a LED (subpackage 500. The LED (sub-)package 500 may comprise a thermally conductive substrate. Further, the LED (sub-)package 500 may comprise a reflective coating 510, configured facing the solid state light source and luminescent converter. The reflective coating 510 may be configured to reflect > 80%, such as > 90%, especially > 95%, like > 98%, including (essentially) 100%, of the light source light and luminescent material light received by the reflective coating 510. Hence, in embodiments, the LED package 500 may comprise a reflective cup.

[0282] Fig. 2B schematically depicts a further embodiment of one or more of the first light generating device 110 and the second light generating device 120. The first luminescent converter 2100 may comprise a layer stack 4000 comprising a primary first luminescent converter layer 2110 and a secondary first luminescent converter layer 2120. Especially, the secondary first luminescent converter layer 2120 may be configured downstream of the primary first luminescent converter layer 2110. Further, the primary first luminescent converter layer 2110 may comprise > 90% of the first broadband luminescent material 310. Additionally, the secondary first luminescent converter layer 2120 may comprise > 90% of the first green-yellow luminescent material 210. One or more of the primary first luminescent2024PF80392

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[0284] converter layer 2110 and the secondary first luminescent converter layer 2120 may further comprise the first narrowband luminescent material 410.

[0285] Additionally or alternatively, the second luminescent converter 2200 may comprise a layer stack 4000 comprising a primary second luminescent converter layer 2210 and a secondary second luminescent converter layer 2220. The secondary second luminescent converter layer 2220 may be configured downstream of the primary second luminescent converter layer 2210. Further, the primary second luminescent converter layer 2210 may comprise > 90% of the second broadband luminescent material 320. Additionally, the secondary second luminescent converter layer 2220 may comprise > 90% of the second green-yellow luminescent material 220. Further, one or more of the primary second luminescent converter layer 2210 and the secondary second luminescent converter layer 2220 may comprise the second narrowband luminescent material 420.

[0286] Fig. 3 schematically depicts a further embodiment of the light generating system 1000. The light generating system 1000 may comprise a LED filament 600.

[0287] Especially, the LED filament 600 may comprise the first light generating device 110, the second light generating device 120, and the third light generating device 130. Optionally, the LED filament 600 may comprise one or more of the fourth light generating device 140 and the fifth light generating device 150.

[0288] Fig. 3 A schematically depicts a side view of the LED filament 600 comprising the first light generating device 110. The LED filament 600 may comprise a plurality of the first solid state light source 10 arranged on an elongated carrier 5. Further, the LED filament 600 may comprise a first elongated encapsulant 710 covering the plurality of first solid state light sources 10 and at least part of the elongated carrier 5. In embodiments, the first elongated encapsulant 710 may comprise the first luminescent converter 2100. In embodiments, the first solid state light sources 10 may be configured on one or more of a first major surface 51 and a second major surface 52 of the elongated carrier 5. In embodiments wherein the first solid state light sources 10 are configured on only the first major surface 51, the elongated carrier 5 may especially be light transmissive.

[0289] Fig. 3B schematically depicts a further embodiment of the LED filament 600, in a cross-sectional view of the LED filament 600. The LED filament 600 may comprise (a first sub-filament 610 comprising) the first light generating device 110, (a second subfilament 620 comprising) the second light generating device 120, and (a third sub-filament 630 comprising) the third light generating device 130. Hence, the LED filament 600 (such as especially the second sub-filament 620) may comprise a plurality of the second solid state2024PF80392

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[0291] light source 20 arranged on the elongated carrier 5. Additionally, the LED filament 600 (such as especially the second sub-filament 620) may comprise a second elongated encapsulant 720 covering the plurality of second solid state light sources 20 and at least part of the elongated carrier 5. In embodiments, the second elongated encapsulant 720 may comprise the second luminescent converter 2200. Further, the LED filament 600 (such as especially the third subfilament 630) may comprise a plurality of the third solid state light source 30 arranged on the elongated carrier 5. Additionally, the LED filament 600 (such as especially the third subfilament 630) may comprise a third elongated encapsulant 730 covering the plurality of third solid state light sources 30 and at least part of the elongated carrier 5. In embodiments, the third elongated encapsulant 730 may comprise the third luminescent converter 2300.

[0292] Fig. 4 schematically depicts an embodiment of a luminaire 2 comprising the light generating system 1000 as described above. Reference 301 indicates a user interface which may be functionally coupled with the control system 3000 of the light generating system 1000. Fig. 4 also schematically depicts an embodiment of lamp 1 comprising the light generating system 1000. Reference 3 indicates a projector device, which may also comprise the light generating system 1000. Fig. 4 also schematically depicts an embodiments of an outdoor light, or stage light, or stadium light. Fig. 4 also schematically depicts a vehicle, like an automobile, but this may also be a truck, a motor cycle, etc. etc., with automotive lighting 4, e.g. headlights. These automotive lighting 4 may also comprise the lighting device 1200 and / or the light generating system 1000. Hence, Fig. 4 schematically depicts embodiments of a lighting device 1200 selected from the group of a lamp 1, a luminaire 2, a lighting fixture, a projector device 3, and an automotive lighting device 4, comprising the light generating system 1000 as described herein. Lighting device light escaping from the lighting device 1200 is indicated with reference 1201. Lighting device light 1201 may essentially consist of (such as be) system light 1001. Reference 1300 refers to a space, such as a room. Reference 1305 refers to a floor and reference 1310 to a ceiling; reference 1307 refers to a wall.

[0293] The term “plurality” refers to two or more. The terms “substantially” or “essentially”, and similar terms, will be understood by the person skilled in the art. The terms “substantially” or “essentially” may also include embodiments with “entirely”, “completely”, “all”, etc. Hence, in embodiments the adjective substantially or essentially may also be removed. Where applicable, the term “substantially” or the term “essentially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%. The term “comprise” also includes embodiments wherein the term “comprises” means “consists of’. The term “and / or” especially relates to one or2024PF80392

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[0295] more of the items mentioned before and after “and / or”. For instance, a phrase “item 1 and / or item 2” and similar phrases may relate to one or more of item 1 and item 2. The term “comprising” may in an embodiment refer to “consisting of’ but may in another embodiment also refer to “containing at least the defined species and optionally one or more other species”. Use of the verb “to comprise” and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0296] Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein.

[0297] The devices, apparatus, or systems may herein amongst others be described during operation. As will be clear to the person skilled in the art, the invention is not limited to methods of operation, or devices, apparatus, or systems in operation. It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0298] The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a device claim, or an apparatus claim, or a system claim, enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. The invention also provides a control system that may control the device, apparatus, or system, or that may execute the herein described method or process. Yet further, the invention also provides a computer program product, when running on a computer which is functionally coupled to or comprised by the device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system. The invention further applies to a device, apparatus, or system comprising one or more of the2024PF80392

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[0300] characterizing features described in the description and / or shown in the attached drawings. The invention further pertains to a method or process comprising one or more of the characterizing features described in the description and / or shown in the attached drawings.

[0301] The various aspects discussed in this patent can be combined in order to provide additional advantages. Further, the person skilled in the art will understand that embodiments can be combined, and that also more than two embodiments can be combined. Furthermore, some of the features can form the basis for one or more divisional applications.

Claims

2024PF8039275CLAIMS:

1. A light generating system (1000) comprising a first light generating device (110), a second light generating device (120), a third light generating device (130), and a control system (3000); wherein:the first light generating device (110) comprises a first solid state light source (10) and a first luminescent converter (2100); wherein the first solid state light source (10) is configured to generate first light source light (11) having a first peak emission wavelength (λp1) selected from the range of 380-490 nm; wherein the first luminescent converter (2100) is configured in a light receiving relationship with the first solid state light source (10);the second light generating device (120) comprises a second solid state light source (20) and a second luminescent converter (2200); wherein the second solid state light source (20) is configured to generate second light source light (21) having a second peak emission wavelength (λp2) selected from the range of 380-490 nm; wherein the second luminescent converter (2200) is configured in a light receiving relationship with the second solid state light source (20);the third light generating device (130) comprises a third solid state light source (30) and a third luminescent converter (2300); wherein the third solid state light source (30) is configured to generate third light source light (31) having a third peak emission wavelength (λp3) selected from the range of 380-490 nm; wherein the third luminescent converter (2300) is configured in a light receiving relationship with the third solid state light source (30);each of the first luminescent converter (2100), the second luminescent converter (2200), and the third luminescent converter (2300) comprises a narrowband luminescent material (400); wherein the first luminescent converter (2100) and the second luminescent converter (2200) each further comprise a green-yellow luminescent material (200) and a broadband luminescent material (300);the green-yellow luminescent material (200) is configured to convert at least part of respectively the first light source light (11) and the second light source light (21) received by the green-yellow luminescent material (200) into green-yellow luminescent2024PF8039276material light (201); wherein the green-yellow luminescent material light (201) has a greenyellow centroid wavelength (λcg) individually selected from the range of 490-590 nm;the broadband luminescent material (300) is configured to convert at least part of (a) respectively the first light source light (11) and the second light source light (21) and / or (b) the green-yellow luminescent material light (201) received by the broadband luminescent material (300) into broadband luminescent material light (301); wherein the broadband luminescent material light (301) has a broadband centroid wavelength (λcb) individually selected from the range of 600-670 nm; wherein the broadband luminescent material light (301) comprises at least one emission band having a broadband full width at half maximum FWHMb of > 60 nm;the narrowband luminescent material (400) is configured to convert at least part of respectively the first light source light (11), the second light source light (21), and the third light source light (31) received by the narrowband luminescent material (400) into narrowband luminescent material light (401); wherein the narrowband luminescent material light (401) has a narrowband centroid wavelength (λcn) individually selected from the range of 610-650 nm; wherein the narrowband luminescent material light (401) comprises at least one emission band having a narrowband full width at half maximum FWHMn of < 40 nm;the first light generating device (110) is configured to generate first device light (111) comprising at least part of the first light source light (11), the green-yellow luminescent material light (201), the broadband luminescent material light (301), and the narrowband luminescent material light (401); wherein the first device light (111) is white light having a first correlated color temperature (CCTi);the second light generating device (120) is configured to generate second device light (121) comprising at least part of the second light source light (21), the greenyellow luminescent material light (201), the broadband luminescent material light (301), and the narrowband luminescent material light (401); wherein the second device light (121) is white light having a second correlated color temperature (CCT2); wherein (CCT2 - CCTi) > 500 K; wherein one or more of the following applies: (i) a relative spectral power of the broadband luminescent material light (301) in the second device light (121) differs from a relative spectral power of the broadband luminescent material light (301) in the first device light (111), and (ii) a relative spectral power of the narrowband luminescent material light (401) in the second device light (121) differs from a relative spectral power of the narrowband luminescent material light (401) in the first device light (111);2024PF8039277the third luminescent converter (2300) consists for at least 80 wt.% of the narrowband luminescent material (400);the third light generating device (130) is configured to generate third device light (131) comprising the narrowband luminescent material light (401); wherein the third device light (131) has a third device centroid wavelength (λcd3) selected from the range of 610-650 nm;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); andthe control system (3000) is configured to control, in an operational mode of the light generating system (1000), a spectral power distribution of the system light (1001) in the wavelength range of 380-780 nm by individually controlling the first light generating device (110), the second light generating device (120), and the third light generating device (130), wherein the system light (1001) in that operational mode is white light having a correlated color temperature selected from the range of 2000-6500 K and a color rendering index of at least 80.

2. The light generating system (1000) according to claim 1, wherein:the first luminescent converter (2100) comprises a first green-yellow luminescent material (210), a first broadband luminescent material (310), and a first narrowband luminescent material (410);the second luminescent converter (2200) comprises a second green-yellow luminescent material (220), a second broadband luminescent material (320), and a second narrowband luminescent material (420);the third luminescent converter (2300) comprises a third narrowband luminescent material (430); andone or more of the following applies: (i) the first green-yellow luminescent material (210) and the second green-yellow luminescent material (220) are of the same type; (ii) the first broadband luminescent material (310) and the second broadband luminescent material (320) are of the same type; and (iii) the first narrowband luminescent material (410), the second narrowband luminescent material (420), and the third narrowband luminescent material (430) are of the same type.2024PF80392783. The light generating system (1000) according to any one of the preceding claims, wherein each of the narrowband luminescent materials (400) comprises a luminescent material of the type M'xM2-2xAX6:Mn4+ wherein M’ comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, germanium, tin, zinc, zirconium, and hafnium, and wherein X comprises a monovalent anion, at least comprising fluorine.

4. The light generating system (1000) according to claim any one of the preceding claims, wherein each of the broadband luminescent materials (300) comprises a luminescent material selected from the group of divalent europium comprising oxynitride luminescent materials, divalent europium comprising nitride luminescent materials, SiAlON phosphors, and luminescent materials of the type M1-xLi3-2yAl1+2y-zSizO4-4y-zN4y+z: Eux, wherein M comprises one or more of Mg, Ca, Sr, and Ba, wherein 0 < x < 0.1, wherein 0 <y < 1, and wherein 0 < z < 0.1.

5. The light generating system (1000) according to any one of the preceding claims, wherein each of the green-yellow luminescent materials (200) comprises a luminescent material of the type A3B5O12:Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc.

6. The light generating system (1000) according to any one of the preceding claims, wherein:the first luminescent converter (2100) comprises (i) the broadband luminescent material (300) in a first broadband concentration (Cbi), and (ii) the narrowband luminescent material (400) in a first narrowband concentration (Cni); wherein Ri = Cbi / Cni;the second luminescent converter (2200) comprises (i) the broadband luminescent material (300) in a second broadband concentration (Cb2), and (ii) the narrowband luminescent material (400) in a second narrowband concentration (Cn2); wherein R.2 = Cb2 / Cn2; andRI / R2> 1.1.

7. The light generating system (1000) according to claim 6, wherein one or more applies of 0.5 < Ri < 1 and 0.3 < R2 < 0.9.2024PF80392798. The light generating system (1000) according to any one of the preceding claims, wherein, in an operational mode of the light generating system (1000), the system light (1001) has a spectral power distribution, wherein: (i) x1% of the spectral power in the wavelength range of 600-660 nm is provided by the broadband luminescent material light (301), and (ii) x2% of the spectral power in the wavelength range of 600-660 nm is provided by the narrowband luminescent material light (401); wherein the control system (3000) is configured to control a ratio x1 / x2by individually controlling the first light generating device (110), the second light generating device (120), and the third light generating device (130).

9. The light generating system (1000) according to any one of the preceding claims, wherein one or more applies of: (i) the first device light (111) has a color point with a distance to the black body locus within 10 standard deviation of color matching, (ii) the second device light (121) has a color point with a distance to the black body locus within 10 standard deviation of color matching, and (iii) the third device light (131) has a spectral power distribution, wherein > 95% of the spectral power in the wavelength range of 380-780 nm is in the wavelength range of 600-660 nm.

10. The light generating system (1000) according to any one of the preceding claims, wherein one or more applies of:the first peak emission wavelength (λp1), the second peak emission wavelength (λp2), and the third peak emission wavelength (λp3) are individually selected from the range of 445-470 nm; andone or more applies of: (i) |λp1 - λp2| > 10 nm, (ii) |λp1 - λp3| > 10 nm, and (iii) |λp2 - λp3| > 10 nm.

11. The light generating system (1000) according to any one of the preceding claims, wherein the third device light (131) has a spectral power distribution, wherein, of the spectral power in the wavelength range of 380-780 nm, (i) < 10% is provided by the third light source light (31), (ii) < 5% is provided by the green-yellow luminescent material light (201), and (iii) < 5% is provided by the broadband luminescent material light (301).

12. The light generating system (1000) according to any one of the preceding claims, wherein the control system (3000) is configured to determine a relative intensity of2024PF8039280the system light (1001) in the wavelength range of 610-650 nm, and wherein the control system (3000) is configured to control the third light generating device (130) based on the relative intensity.

13. The light generating system (1000) according to any one of the preceding claims, wherein the control system (3000) is configured to determine a relative contribution of the narrowband luminescent material light (401) to the system light (1001); wherein the control system (3000) is configured to maintain a predetermined contribution of the narrowband luminescent material light (401) to the system light (1001) by controlling and varying the amount of third device light (131) generated by the third light generating device (130).

14. The light generating system (1000) according to any one of the preceding claims, wherein one of the following applies:the light generating system (1000) comprises a LED package (500), wherein the LED package (500) comprises the first light generating device (110), the second light generating device (120), and the third light generating device (130); andthe light generating system (1000) comprises a LED filament (600), wherein the LED filament (600) comprises the first light generating device (110), the second light generating device (120), and the third light generating device (130).

15. A lighting device (1200) selected from the group of a lamp (1), a luminaire (2), a lighting fixture, a projector device (3), and an automotive lighting device (4), comprising the light generating system (1000) according to any one of the preceding claims.

Images