Light generating system comprising KSIF white and (OXY)nitride red LED packages

Abstract

The invention provides a light generating system (1000) configured to generate system light (1001), wherein the light generating system (1000) comprises N first light generating devices (110) and M second light generating devices (120), wherein: (A) each first light generating device (110) comprises a first light source (10) and a first luminescent converter (2100); (B) the first light source (10) is configured to generate first light source light (11); (C) the first luminescent converter (2100) comprises a first luminescent material (210) and a second luminescent material (220); the first luminescent material (210) is configured to convert part of the first light source light (11) into first luminescent material light (211) having a first luminescent material centroid wavelength (λlc1) selected from the range of 510-570 nm; the second luminescent material (220) is configured to convert part of the first light source light (11) into second luminescent material light (221) having a second luminescent material centroid wavelength (λlc2) selected from the range of 625-635 nm; (D) each first light generating device (110) is configured to generate first device light (111) having a spectral power distribution in the wavelength range of 380-780 nm with at maximum 30% of the spectral power provided by the first light source light (11) and at least 70% of the spectral power provided by the first luminescent material light (211) and the second luminescent material light (221); (E) each second light generating device (120) comprises a second light source (20) and a second luminescent converter (2200); (F) the second light source (20) is configured to generate second light source light (21); (G) the second luminescent converter (2200) comprises a third luminescent material (230); the third luminescent material (230) is configured to convert at least part of the second light source light (21) into third luminescent material light (231) having a third luminescent material centroid wavelength (λlc3) selected from the range of 600-660 nm; (H) each second light generating device (120) is configured to generate second device light (121) having a spectral power distribution in the wavelength range of 380-780 nm with at least 70% of the spectral power provided by the third luminescent material light (231) and at maximum 30% of the spectral power provided by the second light source light (21); and (I) in a first operational mode of the light generating system (1000), the system light (1001) is white light having a correlated color temperature in a range from 2000-6500 K and a color rendering index of at least 80.

Description

[0001]2023PF80239 1 LIGHT GENERATING SYSTEM COMPRISING KSIF WHITE AND (OXY)NITRIDE RED LED PACKAGES FIELD OF THE INVENTION The invention relates to a light generating system. The invention further relates to a lighting device comprising the light generating system. BACKGROUND OF THE INVENTION Light generating systems comprising luminescent materials are known in the art. For instance, US2020347999A1 describes a full spectrum white light emitting device including a broadband solid-state excitation source for generating broadband excitation light with a dominant wavelength from about 420 nm to about 480 nm and a full width at half maximum intensity greater than about 25 nm; and a narrowband red photoluminescence material with an emission peak wavelength from about 620 nm to about 640 nm and a full width at half maximum emission intensity of less than about 30 nm; where the device has an efficacy of at least 130 lm / W and generates white light with a CRI Ra≥90, and where over a wavelength range from about 430 nm to about 520 nm, a maximum percentage intensity deviation of the white light from the intensity of light of a black-body curve or CIE Standard Illuminant D of the same Correlated Color Temperature is less than about 50%. SUMMARY OF THE INVENTION To produce light with a suitable color temperature, a luminescent converter may comprise multiple types of phosphor, such as a yellow and a red phosphor. There appears to be a desire to provide light with a high CRI and / or (early stage) tunable spectral power distributions. However, prior art solutions may have problems to provide high CRIs, and / or efficient solutions. Further, prior art solutions may have problems with self-absorption in the phosphor layer, wherein light emitted by a first type of phosphor is absorbed by a second type of phosphor, thereby reducing the efficiency of the system and altering one or more of the correlated color temperature, color rendering index, and color point of the system light. Hence, it is an aspect of the invention to provide an alternative light generating system, which preferably further at least partly obviates one or more of above-described drawbacks. 2023PF80239 2 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. According to a first aspect, the invention provides a light generating system configured to generate system light, wherein the light generating system comprises N first light generating devices and M second light generating devices. In embodiments, each first light generating device may comprise a first light source and a first luminescent converter. The first light source may especially comprise a solid state light source. Further, the first light source may be configured to generate first light source light having a first light source centroid wavelength ^sc1 selected from the range of 430-490 nm. In embodiments, the first luminescent converter may comprise a first (green-yellow) luminescent material and a second (red) luminescent material. The first (green-yellow) luminescent material may in embodiments be configured to convert part of the first light source light into first (green- yellow) luminescent material light, having a first luminescent material centroid wavelength ^lc1 selected from the range of 510-570 nm. Conversely, the second (red) luminescent material may be configured to convert part of the first light source light into second (red) luminescent material light having a second luminescent material centroid wavelength λlc2 selected from the range of 625-635 nm. In embodiments, at least 90 weight percent (w / w%) of the first luminescent material may be A3B5O12:Ce3+; wherein A comprises at least one of Y, La, Gd, Tb and Lu; and wherein B comprises at least one of Al, Ga, In and Sc. Additionally or alternatively, in embodiments, at least 90 weight percent (w / w%) of the second luminescent material may be M’zM2-2zAX6doped with tetravalent manganese; wherein M’ comprises an alkaline earth cation; wherein M comprises an alkaline cation, and z is in the range from 0 to 1; wherein A comprises a tetravalent cation; and wherein X comprises a monovalent anion, at least comprising fluorine. In embodiments, each first light generating device may be configured to generate first device light having a spectral power distribution in the wavelength range of 380-780 nm with at maximum 30% of the spectral power provided by the first light source light and at least 70% of the spectral power provided by the first (green-yellow) luminescent material light and the second (red) luminescent material light. Further, in embodiments, each second light generating device may comprise a second light source and a second luminescent converter. The second light source may especially comprise a solid state light source. Additionally, the second light source may be configured to generate second light source light having a second light source centroid wavelength ^sc2selected from the range of 430-490 nm. In embodiments, the second luminescent converter may comprise a third (red) luminescent material. The third 2023PF80239 3 luminescent material may especially be configured to convert at least part of the second light source light into (red) third luminescent material light having a third luminescent material centroid wavelength ^lc3selected from the range of 600-660 nm. Further, in embodiments, at least 90 weight percent (w / w%) of the third (red) luminescent material may be an oxynitride luminescent material and / or a nitride luminescent material. In embodiments, each second light generating device may be configured to generate second device light having a spectral power distribution in the wavelength range of 380-780 nm with at least 70% of the spectral power provided by the (red) third luminescent material light and at maximum 30% of the spectral power provided by the second light source light. In embodiments, in a first operational mode of the light generating system, the system light may comprise at least first device light. Additionally or alternatively, in the first operational mode of the light generating system, the system light may comprise at least second device light. Additionally or alternatively, in a first operational mode of the light generating system, the system light may be white light having a correlated color temperature in a range from 2000-6500 K(, such as especially in a range from 2700-4000 K,) and a color rendering index of at least 80(, such as at least 85, especially at least 90). Hence, in specific embodiments, the invention may provide a light generating system configured to generate system light, wherein the light generatingsystem comprises N first light generating devices and M second light generating devices,wherein: (A) each first light generating device comprises a first light source and a first luminescent converter; (B) the first light source comprises a solid state light source, wherein the first light source is configured to generate first light source light having a first light source centroid wavelength ^sc1selected from the range of 430-490 nm; (C) the first luminescent converter comprises a first luminescent material and a second luminescent material; the first luminescent material is configured to convert part of the first light source light into first luminescent material light, having a first luminescent material centroid wavelength ^lc1 selected from the range of 510-570 nm; the second luminescent material is configured to convert part of the first light source light into second luminescent material light having a second luminescent material centroid wavelength ^lc2 selected from the range of 625-635 nm; (D) wherein at least 90 weight percent (w / w%) of the first luminescent material is A3B5O12:Ce3+; wherein A comprises at least one of Y, La, Gd, Tb and Lu; and wherein B comprises at least one of Al, Ga, In and Sc; wherein at least 90 weight percent (w / w%) of the second luminescent material is M’zM2-2zAX6 doped with tetravalent manganese; wherein M’ comprises an alkaline earth cation; wherein M comprises an alkaline cation, and z is in the range from 0 to 1; wherein A comprises a tetravalent cation; and wherein X comprises a 2023PF80239 4 monovalent anion, at least comprising fluorine; (E) each first light generating device is configured to generate first device light having a spectral power distribution in the wavelength range of 380-780 nm with at maximum 30% of the spectral power provided by the first light source light and at least 70% of the spectral power provided by the first luminescent material light and the second luminescent material light; (F) each second light generating device comprises a second light source and a second luminescent converter; (G) the second light source comprises a solid state light source, wherein the second light source is configured to generate second light source light having a second light source centroid wavelength ^sc2 selected from the range of 430-490 nm; (H) the second luminescent converter comprises a third luminescent material; the third luminescent material is configured to convert at least part of the second light source light into third luminescent material light having a third luminescent material centroid wavelength ^lc3selected from the range of 600- 660 nm; (I) at least 90 weight percent (w / w%) of the third luminescent material is an oxynitride luminescent material and / or a nitride luminescent material; (J) each second light generating device is configured to generate second device light having a spectral power distribution in the wavelength range of 380-780 nm with at least 70% of the spectral power provided by the third luminescent material light and at maximum 30% of the spectral power provided by the second light source light; and (K) in a first operational mode of the light generating system, (a) the system light comprises at least first device light and second device light, and (b) the system light is white light having a correlated color temperature in a range from 2000-6500 K and a color rendering index of at least 80. With such a light generating system, multiple luminescent materials (providing luminescent material light having different centroid wavelengths) may be used, to facilitate increasing the color rendering index (CRI) and / or adjusting the correlated color temperature (CCT) of the system light. Yet, with such a light generating system, the luminescent materials may be divided over different light generating devices, thereby preventing absorption of e.g. first luminescent material light by e.g. the third luminescentmaterial, and (thus) improving the efficiency of the light generating system. Further, withsuch a light generating system, the CRI and / or CCT of the system light may be adjusted during use of the light generating system by adjusting the (relative) intensity of the first device light and the second device light. In embodiments, the light generating system may comprise N first light generating devices. Additionally or alternatively, in embodiments, the light generating system may comprise M second light generating devices. In embodiments, N and M may be 2023PF80239 5 individually selected from the range of ≥ 4, such as from the range of ≥ 8, especially from the range of ≥ 10. Additionally or alternatively, in embodiments, N and M may be individually selected from the range of ≤ 1000, such as from the range of ≤ 500, especially from the range of ≤ 250. In embodiments, the light generating system may comprise the same number of first light generating devices as second light generating devices, i.e., N=M. Alternatively, the light generating system may comprise more second light generating devices than first light generating devices. Hence, in embodiments, N / M ≤ 1, such as N / M ≤ 0.75, especially N / M ≤ 0.5, like N / M ≤ 0.1. Additionally or alternatively, N / M ≥ 0.01, such as N / M ≥ 0.025, especially N / M ≥ 0.05. A relatively low number of first light generating devices compared to the number of second light generating devices may provide the benefit that the system light may (mainly) comprise a blue component (from the second light source light) and a red component (from the third luminescent material). Such configurations may for instance be beneficial for horticultural applications, where the growth and / or production yield of plants may be improved upon irradiation with (mainly) blue and red light. In (other) embodiments, the light generating system may comprise the same number or more first light generating devices than second light generating devices, i.e., N ≥ M. Especially, in embodiments, N / M ≥ 1, such as N / M ≥ 2, especially N / M ≥ 3. Further, in embodiments, N / M ≥ 5, such as N / M ≥ 7, especially N / M ≥ 10, like N / M ≥ 15. Additionally or alternatively, in embodiments, N / M ≤ 50, such as N / M ≤ 40, especially N / M ≤ 25. Hence, in specific embodiments, N / M ≥ 3. A light generating system comprising more first light generating devices than second light generating devices may provide the benefit that the homogeneity of the system light may be improved, as the system light may comprise a relatively low contribution of the second device light. Further, in embodiments, the first device light may comprise a green-yellow component (provided by the first luminescent material light) which may be absent in the second device light. Hence, by increasing the relative amount of first light generating devices in the light generating system, the green-yellow (first luminescent material light) component in the system light may be (relatively) increased, improving the CRI of the system light towards green and yellow (test) objects. Additionally, the first device light may be white light (see below), and a relatively large number of first light generating devices may therefore have the benefit of facilitating the generating of white system light. In embodiments, each first light generating device may comprise a first light source. Similarly, in embodiments, each second light generating device may comprise a second light source. The first light source and / or the second light source may especially (each) comprise a solid state light source (see below). Further, in embodiments, the first light 2023PF80239 6 source may be configured to generate first light source light, and the second light source may be configured to generate second light source light. In embodiments, the first light source light may have a first light source centroid wavelength λsc1 selected from the range of 400- 500 nm, such as from the range of 410-490 nm, especially from the range of 430-490 nm, like from the range of 430-470 nm. Hence, in embodiments, the first light source light may be blue light. In embodiments, the first light source centroid wavelength λsc1 of the first light source light may be individually selected for each of the N first light generating devices. Alternatively, each first light generating device may comprise a first light source configured to provide first light source light having the same first light source centroid wavelength λsc1. Hence, in embodiments, each first light generating device may comprise the same first light source, or each first light generation device may comprise a different first light source. In embodiments, the second light source light may have a second light source centroid wavelength λsc2 selected from the range of 400-500 nm, such as from the range of 410-490 nm, especially from the range of 430-490 nm. Hence, in embodiments, the second light source light may be blue light. In embodiments, the second light source centroid wavelength λsc2 of the second light source light may be individually selected for each of the M second light generating devices. Alternatively, each second light generating device may comprise a second light source configured to provide second light source light having the same second light source centroid wavelength λsc2. Hence, in embodiments, each second light generating device may comprise the same second light source, or each second light generation device may comprise a different second light source. Further, in embodiments, the second light source light may have a second light source centroid wavelength λsc2selected from the range of 435-500 nm, such as from the range of 450-495 nm, especially from the range of 478-490 nm. Hence, in specific embodiments, ^sc2may be selected from the range of 478-490 nm. Such a second light source centroid wavelength λsc2may have as advantage that the first (and / or second) luminescent material(s) may have a relatively low absorption coefficient for light having a wavelength of 478-490 nm, reducing (and / or preventing) crosstalk between the first light generating device(s) and the second light generating device(s). Herein, crosstalk refers to the process wherein the luminescent converter (especially a luminescent material) of a first light generating device absorbs light (such as especially light source light) emitted by a neighboring light generating device, and converts said light into subsequently emitted luminescent material light. The term “centroid wavelength”, also indicated as λc, is known in the art, and refers to the wavelength value where half of the light energy is at shorter and half the energy 2023PF80239 7 is at longer wavelengths; the value is stated in nanometers (nm). It is the wavelength that divides the integral of a spectral power distribution into two equal parts as expressed by the formula λc = Σ λ*I(λ) / (Σ I( λ)), where the summation is over the wavelength range of interest, and I(λ) 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 first light source centroid wavelength λsc1 may be (roughly) equal to the second light source centroid wavelength λsc2. That is, in embodiments, |^sc1-^sc2| ≤ 30 nm, such as |^sc1-^sc2| ≤ 20 nm, especially |^sc1-^sc2| ≤ 10 nm, like |^sc1- ^sc2| ≤ 5 nm, including ^sc1 = ^sc2. Hence, in specific embodiments, |^sc1-^sc2| ≤ 10 nm. A difference between the first light source centroid wavelength λsc1 and the second light source centroid wavelength λsc2 of ≤ 10 nm may facilitate using the same (type of) (solid state) light source for both the first light generating devices and the second light generating devices. Further, selecting |^sc1-^sc2| ≤ 10 nm may facilitate that both the first light source(s) and the second light source(s) may provide (roughly) the same blue light. Hence, both the first light source(s) and the second light source(s) may e.g. provide blue light having a light source centroid wavelength λsc close to the maximum spectral sensitivity (towards blue light) of thehuman eye. Yet, in (other) embodiments, the first light source centroid wavelength λsc1 maydiffer from the second light source centroid wavelength λsc2. Especially, in embodiments, |^sc1-^sc2| ≥ 15 nm, such as |^sc1-^sc2| ≥ 20 nm, especially |^sc1-^sc2| ≥ 30 nm, like |^sc1- ^sc2| ≥ 40 nm. Hence, in specific embodiments, |^sc1-^sc2| ≥ 30 nm. A difference of ≥ 15 nm, especially ≥ 30 nm, between the first light source centroid wavelength λsc1 and the second light source centroid wavelength λsc2may reduce crosstalk between the (first and second) light generating devices. In embodiments, the first light source centroid wavelength λsc1may have a larger wavelength than the second light source centroid wavelength λsc2, i.e., λsc1 > λsc2. Yet, especially, the second light source centroid wavelength λsc2 may have a larger wavelength than the first light source centroid wavelength λsc1, i.e., λsc2> λsc1. In embodiments, each first light generating device may comprise a first luminescent converter. Similar as to the first light source, each first light generating device may comprise the same first luminescent converter, or each first light generating device may comprise a different first luminescent converter (differing in e.g. the compositing of the luminescent materials and / or a first luminescent converter content, see below). Hence, wherever a range is indicated in relation to the first luminescent converter, a value from that range may be individually selected for each (first luminescent converter comprised by a 2023PF80239 8 separate) first light generating device. In embodiments, the first light source light (emitted by the first light source comprised by the first light generating device) may be (at least partially, such as essentially fully) incident on the first luminescent converter. Hence, the first luminescent converter may be configured downstream of the first light source. The terms “upstream” and “downstream” relate to an arrangement of items or features relative to the propagation of the light from a light generating means (here the especially the light source), 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”. In embodiments, the first luminescent converter may be configured on top of (and in physical contact with) the first light source (of the respective first light generating device). Alternatively, the first luminescent converter may be configured remote from the first light source. In such embodiments, the first luminescent converter may be configured at a non-zero first distance d1 from the first light source (of the respective first light generating device). Especially, the first light source may have a face, such as a face comprising a light escape surface (see below). In embodiments, the first luminescent converter may be configured at a distance d1 from said face of the first light source (see also below). Further, in embodiments, the first luminescent converter may be physically separated from the first light source (i.e. no physical contact). The first luminescent converter may comprise a first (green- yellow) luminescent material and a second (red) luminescent material. Optionally, the first luminescent converter may comprise one or more further luminescent materials. Similarly, in embodiments, each second light generating device may comprise a second luminescent converter. Similar as indicated for the first light generating device(s) above, each second light generating device may comprise the same second luminescent converter, or each second light generating device may comprise a different second luminescent converter (differing in e.g. the compositing of the luminescent materials and / or a second luminescent converter content, see below). Hence, wherever a range is indicated in relation to the second luminescent converter, a value from that range may be individually selected for each (second luminescent converter comprised by a separate) second light generating device. In embodiments, the second light source light (emitted by the second light source comprised by the second light generating device) may be (at least partially, such as essentially fully) incident on the second luminescent converter. Hence, the second luminescent converter may be configured downstream of the second light source. In embodiments, the second luminescent converter may be configured on top of (and in physical 2023PF80239 9 contact with) the second light source (of the respective second light generating device). Alternatively, the second luminescent converter may be configured remote from the second light source. In such embodiments, the second luminescent converter may be configured at a non-zero second distance d2 from the second light source (of the respective second light generating device). Especially, the second light source may have a face, such as a face comprising a light escape surface (see below). In embodiments, the second luminescent converter may be configured at a distance d2 from said face of the second light source. In embodiments, the distance d1(for the first light generating device, see above) and the distance d2may be individually selected from the range of ≥ 5 µm, such as from the range of ≥ 15 µm, especially from the range of ≥ 50 µm. Further, the distance d1 and the distance d2 may be individually selected from the range of ≤ 10 mm, such as from the range of ≤ 5 mm, especially from the range of ≤ 2.5 mm. Further, in embodiments, the second luminescent converter may be physically separated from the second light source (i.e. no physical contact). The second luminescent converter may comprise a third (red) luminescent material. The term “luminescent material” may especially refer to a material that can convert first radiation, especially one or more of UV radiation and blue radiation (such as e.g. blue light source light), into second radiation. 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. In general, the first radiation and second radiation 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. For instance, in embodiments the luminescent material may be able to convert one or more of UV radiation and blue radiation, into visible light. The terms “visible”, “visible light” or “visible emission” and similar terms refer to light having one or more wavelengths in the range of about 380-780 nm. Herein, UV (ultraviolet) may especially refer to a wavelength selected from the range of 190-380 nm, such as 200-380 nm, though in specific embodiments other wavelengths may also be possible. 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 (λex<λem), though in specific embodiments the luminescent material may comprise up-converter luminescent material, i.e. radiation with 2023PF80239 10 a larger wavelength is converted into radiation with a smaller wavelength (λex>λem). 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. 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. In specific embodiments, the luminescent material may at least 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 (solid state) light source light may comprise blue (solid state) 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 A3B5O12 garnets, 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); however, in addition to aluminum, B may also partly comprise gallium (Ga) and / or scandium (Sc) and / or indium (In), especially up to about 20% of B, more especially up to about 10 % of B (i.e. the B ions essentially consist of 90 or more mole % of Al and 10 or less 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. 2023PF80239 11 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 x is equal to or larger than 0 and equal to or smaller than 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. For instance, in the case of (Y1- xLux)3Al5O12:Ce, part of Y and / or Lu 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). Assuming 1% Ce and 10% Y, the full correct formula could be (Y0.1Lu0.89Ce0.01)3Al5O12. Ce in garnets is substantially or only in the trivalent state, as is known to the person skilled in the art. In embodiments, the luminescent material (thus) comprises A3B5O12 wherein in specific embodiments at maximum 10% of B-O may be replaced by Si-N. Here, B in B-O refers to one or more of Al, Ga, In and Sc (and O refers to oxygen); in specific embodiments B-O may refer to Al-O. As indicated above, in specific embodiments x3 may be selected from the range of 0.001-0.04. Especially, such luminescent materials may have a suitable spectral distribution (see however below), have a relatively high efficiency, have a relativelyhigh thermal stability, and allow a high CRI (optionally in combination with (the) light ofother sources of light as described herein). In specific embodiments, the luminescent material may only include luminescent materials selected from the type of cerium comprising garnets. In even further specific embodiments, the luminescent material may include a single type of luminescent material, such as (Yx1A’x2Cex3)3(Aly1B’y2)5O12. Hence, in specific embodiments, the luminescent material may comprise luminescent material, wherein at least 85 weight%, even more especially at least about 90 wt.%, such as yet even more especially at least about 95 weight % of the luminescent material comprises (Yx1A’x2Cex3)3(Aly1B’y2)5O12. 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 consisting of Ga, In and Sc, wherein x1+x2+x3=1, wherein x3>0, wherein 0<x2+x3≤0.2, wherein y1+y2=1, 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. In embodiments, the luminescent material may comprise a luminescent material of the type A3Si6N11: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 luminescent 2023PF80239 12 material may alternatively or additionally comprise one or more of MS:Eu2+and / or M2Si5N8:Eu2+and / or MAlSiN3:Eu2+and / or Ca2AlSi3O2N5: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)2Si5N8:Eu. Further, the luminescent material may comprise one or more materials selected from the group comprising Sr[LiAl3N4]:Eu, SrMg3SiN4:Eu, Li2SiN2:Eu3+, Li2Ca2[Mg2Si2N6]:Eu, Sr[Mg3SiN4]:Eu, Ba[Mg3SiN4]:Eu, Sr4[LiAl11N14]:Eu, Ca18.75Li10.5[Al39N55]:Eu, Ca[LiAl3N4]:Eu, SrAl2Si3ON6:Eu, and Sr[Li2Al2O2N2]:Eu. In embodiments, the luminescent material may comprise M2Si5-pAlpOpN8-p:Eu, wherein M comprises one or more of Mg, Ca, Sr, Ba, and Zn, and wherein 0 ≤ p ≤ 1. In embodiments wherein p = 0, M2Si5-pAlpOpN8-p:Eu may especially be a nitride luminescent material, while for an oxynitride luminescent material it may apply that p > 0. In the aforementioned compounds, unless stated otherwise, 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 (Ca0.98Eu0.02)AlSiN3. The material (Ba,Sr,Ca)S:Eu can also be indicated as MS:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound calcium or strontium, or calciumand strontium, more especially calcium. Here, Eu is introduced and replaces at least part of M(i.e. one or more of Ba, Sr, and Ca). Further, the material (Ba,Sr,Ca)2Si5N8:Eu can also be indicated as M2Si5N8:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound Sr and / or Ba. In a further specific embodiment, M consists of Sr and / or Ba (not taking into account the presence of Eu), especially 50 to 100%, more especially 50 to 90% Ba and 50 to 0%, especially 50 to 10% Sr, such as Ba1.5Sr0.5Si5N8:Eu (i.e.75 % Ba; 25% Sr). Here, Eu is introduced and replaces at least part of M, i.e. one or more of Ba, Sr, and Ca). Likewise, the material (Ba,Sr,Ca)AlSiN3:Eu can also be indicated as MAlSiN3:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound calcium or strontium, or 2023PF80239 13 calcium and strontium, more especially calcium. Here, Eu is introduced and replaces at least part of M (i.e. one or more of Ba, Sr, and Ca). Eu in the above indicated luminescent materials is substantially or only in the divalent state, as is known to the person skilled in the art. 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. In embodiments, the luminescent material may comprise a luminescent material of the type M’xM2-2xAX6doped 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, wherein X comprises a monovalent anion, at least comprising fluorine. Such luminescent materials may herein also be indicated as “KSiF” or “KSF”, whether or not M comprises K or one or more other alkaline cations. A luminescent material of the type M’xM2-2xAX6doped with tetravalent manganese is amongst others described in WO2013121355A1, which is hereby herein incorporated by reference. Passages from WO2013121355A1 are also copied herein. Relevant alkaline earth cations (M’) are magnesium (Mg), strontium (Sr), calcium (Ca) and barium (Ba), especially one or more of Sr and Ba. Relevant alkaline cations (M) are sodium (Na), potassium (K) and rubidium (Rb). Optionally, also ammonium (NH4+), lithium (Li) and / or cesium (Cs) may be applied. In a preferred embodiment, M comprises at least potassium. In yet another embodiment, M comprises at least rubidium. In another preferred embodiment, M comprises at least potassium and rubidium. Optionally, the M’xM2-2xAX6 luminescent material has the hexagonal phase. In yet another embodiment, the M’xM2-2xAX6luminescent material has the cubic phase. In an embodiment, a combination of different alkaline cations may be applied. In yet another embodiment, a combination of different alkaline earth cations may be applied. In yet another embodiment, a combination of one or more alkaline cations and one or more alkaline earth cations may be applied. For instance, KRb0.5Sr0.25AX6might be applied, wherein x may be selected from the range of 0-1, especially x ≤ 1. In specific embodiments, x = 0. 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’xM2-2xA1-mMnmX6. The mole percentage of manganese, i.e. the 2023PF80239 14 percentage it replaces the tetravalent 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+). 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), stannum (Sn) and zinc (Zn). Preferably, at least 80%, even more preferablyat least 90%, such as at least 95% of A consists of silicon.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. Especially, X essentially consists of F (fluorine). In an embodiment, M’xM2-2xAX6comprises K2SiF6(indicated herein also as KSiF system). In another preferred embodiment, M’xM2-2xAX6 comprises KRbSiF6 (herein also indicated as K,Rb system). In specific embodiments, the indication M’xM2-2xAX6 may refer to one or more of (K,Rb)2SiF6:Mn4+, (K,Rb)2TiF6:Mn4+, K2(Si,Ti)F6:Mn4+, and Rb2(Si,Ti)F6:Mn4+, such as one or more of K2TiF6:Mn4+, of K2SiF6: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)2SiF6:Mn4+and K2(Si,Ti)F6:Mn4+. The luminescent material may also be coated, as also described in WO2013121355A1. In embodiments, the first luminescent material (of the first luminescent convertor) may be any (combination) of the luminescent materials described above. Yet, especially, in embodiments the first luminescent material may comprise A3B5O12:Ce3+, wherein A comprises at least one of Y, La, Gd, Tb and Lu; and wherein B comprises at least one of Al, Ga, In and Sc. In embodiments, at least 50 weight percent (w / w%), such as at least 65 weight percent (w / w%), especially at least 80 weight percent (w / w%), of the first (green- yellow) luminescent material may be A3B5O12:Ce3+. Further, at least 85 weight percent (w / w%), such as at least 90 weight percent (w / w%), especially at least 95 weight percent (w / w%), including (essentially) 100 weight percent (w / w%), of the first (green-yellow) luminescent material may be A3B5O12:Ce3+, wherein A comprises at least one of Y, La, Gd, Tb and Lu; and wherein B comprises at least one of Al, Ga, In and Sc. Hence, in specific 2023PF80239 15 embodiments, (essentially) 100 weight percent (w / w%) of the first (green-yellow) luminescent material may be A3B5O12:Ce3+, i.e., the first luminescent material may (essentially) consist of A3B5O12:Ce3+, wherein A comprises at least one of Y, La, Gd, Tb and Lu; and wherein B comprises at least one of Al, Ga, In and Sc. The phrase ‘at least X weight percent (w / w%) of A may be B’ and similar phrases may herein refer to at least X% of the weight of A consisting of B. In embodiments, at most 95% weight percent (w / w%), such as at most 90 weight percent (w / w%), especially at most 80 weight percent (w / w%), like at most 75 weight percent (w / w%), of the first (green-yellow) luminescent material may be A3B5O12:Ce3+. In embodiments, the weight percent (w / w%) of the first luminescent material not consisting of A3B5O12:Ce3+may consist of a (combination of) luminescent material(s) selected from the luminescent materials described above, such as especially a (combination of) luminescent material(s) configured to convert (part of) the first light source light into green-yellow light. In embodiments, the first luminescent material may thus comprise A3B5O12:Ce3+, wherein A comprises at least one of Y, La, Gd, Tb and Lu; and wherein B comprises at least one of Al, Ga, In and Sc. Especially, in embodiments, in the first luminescent material, A may consist for at least 70 atom%, such as at least 80 atom%, especially at least 90 atom%, like at least 95 atom%, including (essentially) 100 atom%, of Y and / or Lu. Herein, the phrase ‘A may consist for at least X atom% of B’ and similar phrases may refer to at least X% of the atoms of A consisting of B (atoms). Further, in embodiments, in the first luminescent material, B (from A3B5O12:Ce3+) may consist for at least 70 atom%, such as at least 80 atom%, especially at least 90 atom%, like at least 95 atom%, including (essentially) 100 atom%, of Al. Hence, in specific embodiments, in the first luminescent material A may consist for at least 90 atom% of Y and / or Lu and B may consist for at least 90 atom% of Al. Such a composition of the first luminescent material comprising A3B5O12:Ce3+may provide a first luminescent material configured to emit green-yellow light. Further, such a composition of the first luminescent material comprising A3B5O12:Ce3+may be relatively stable and have a relatively high efficiency. The terms “blue light” or “blue emission”, and similar terms, may especially relate to light having a (centroid) wavelength in the range of about 440-490 nm. The terms“green light” or “green emission”, and similar terms, may especially relate to light having a(centroid) wavelength in the range of about 490-560 nm. The terms “yellow light” or “yellowemission”, and similar terms, may especially relate to light having a (centroid) wavelength in the range of about 560-590 nm. The terms “orange light” or “orange emission”, and similar terms, may especially relate to light having a (centroid) wavelength in the range of about 2023PF80239 16 590-620 nm. The terms “red light” or “red emission”, and similar terms, may especiallyrelate to light having a (centroid) wavelength in the range of about 620-780 nm. The phrase“light having a wavelength in a wavelength range” and similar phrases may especially indicate that the indicated light (or radiation) has a spectral power distribution with at least an intensity or intensities at the wavelength in the indicated wavelength range. For instance, a blue emitting solid state light source will have a spectral power distribution with intensities at at least a wavelength in the 440-495 nm wavelength range. In embodiments, the first luminescent material may be configured to emit first luminescent material light, especially upon excitation with (blue) first light source light. That is, the first luminescent material may be configured to convert part of the first light source light into first (green-yellow) luminescent material light. In embodiments, the first luminescent material may be configured to convert (on a spectral power basis) ≥ 10%, suchas ≥ 20%, especially ≥ 30%, like ≥ 40%, of the first light source light received by the firstluminescent material into first luminescent material light. Additionally or alternatively, in embodiments, the first luminescent material may be configured to convert (on a spectral power basis) ≤ 90%, such as ≤ 80%, especially ≤ 70%, like ≤ 60%, of the first light source light received by the first luminescent material into first luminescent material light. In embodiments, the first luminescent material light may have a first luminescent material centroid wavelength ^lc1. The first luminescent material centroid wavelength ^lc1 may in embodiments especially be selected from the range of 490-590 nm, such as from the range of500-580 nm, especially from the range of 510-570 nm, like from the range of 525-560 nm orfrom the range of 540-570 nm. Hence, the first luminescent material light may be green-yellow light. In embodiments, the first luminescent converter may further comprise a second (red) luminescent material. The second luminescent material may be any (combination) of the luminescent materials described above. Yet, especially, in embodiments the second luminescent material may comprise M’zM2-2zAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, wherein M comprises an alkaline cation, and z is in the range from 0 to 1, wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine. In embodiments, at least 50 weight percent (w / w%), such as at least 65 weight percent (w / w%), especially at least 80 weight percent (w / w%), of the second (red) luminescent material may be M’zM2-2zAX6. Further, at least 85 weight percent (w / w%), such as at least 90 weight percent (w / w%), especially at least 95 weight percent (w / w%), including (essentially) 100 weight 2023PF80239 17 percent (w / w%), of the second (red) luminescent material may be M’zM2-2zAX6doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, wherein M comprises an alkaline cation, and z is in the range from 0 to 1, wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine. Hence, in specific embodiments, (essentially) 100 weight percent (w / w%) of the second (red) luminescent material may be M’zM2-2zAX6, i.e., the second luminescent material may (essentially) consist of M’zM2-2zAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, wherein M comprises an alkaline cation, and z is in the range from 0 to 1, wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine. In alternative embodiments, at most 95% weight percent (w / w%), such as at most 90 weight percent (w / w%), especially at most 80 weight percent (w / w%), like at most 75 weight percent (w / w%), of the second (red) luminescent material may be M’zM2- 2zAX6 doped with tetravalent manganese. In embodiments, the weight percent (w / w%) of the second luminescent material not consisting of M’zM2-2zAX6 doped with tetravalent manganese may consist of a (combination of) luminescent material(s) selected from the luminescent materials described above, such as especially a (combination of) luminescent material(s) configured to convert (part of) the first light source light into red light. In embodiments, in the second luminescent material comprising M’zM2-2zAX6doped with tetravalent manganese, z ≤ 1, such as z ≤ 0.5, especially z ≤ 0.25, like z ≤ 0.1, including z = 0. Further, in embodiments, in the second luminescent material (comprising M’zM2-2zAX6 doped with tetravalent manganese), M may consist for at least 70 atom%, such as at least 80 atom%, especially at least 90 atom%, like at least 95 atom%, including (essentially) 100 atom%, of K and / or Rb. Additionally or alternatively, in embodiments, in the second luminescent material (comprising M’zM2-2zAX6doped with tetravalent manganese), A may consist for at least 70 atom%, such as at least 80 atom%, especially at least 90 atom%, like at least 95 atom%, including (essentially) 100 atom%, of Si and / or Ti. Additionally or alternatively, in embodiments, in the second luminescent material (comprising M’zM2-2zAX6 doped with tetravalent manganese), X may consist for at least 70 atom%, such as at least 80 atom%, especially at least 90 atom%, like at least 95 atom%, including (essentially) 100 atom%, of F. Hence, in specific embodiments, in the second luminescent material z = 0, M may consist for at least 90 atom% of K and / or Rb, A may consist for at least 90 atom% of Si and / or Ti, and X may consist for at least 90 atom% of F. Such a composition of the second luminescent material comprising M’zM2-2zAX6 doped with tetravalent manganese may 2023PF80239 18 provide a second luminescent material configured to emit red light. Further, such a composition of the second luminescent material may have a relatively narrow bandwidth. In embodiments, the second luminescent material may be configured to emit second luminescent material light, especially upon excitation with (blue) first light sourcelight. That is, the second luminescent material may be configured to convert part of the firstlight source light into second (red) luminescent material light. In embodiments, the second luminescent material may be configured to convert (on a spectral power basis) ≥ 5%, such as ≥ 10%, especially ≥ 20%, like ≥ 30%, of the first light source light received by the second luminescent material into second luminescent material light. Additionally or alternatively, in embodiments, the second luminescent material may be configured to convert (on a spectral power basis) ≤ 70%, such as ≤ 60%, especially ≤ 50%, like ≤ 40%, of the first light source light received by the second luminescent material into second luminescent material light. In embodiments, the second luminescent material light may have a second luminescent material centroid wavelength ^lc2. The second luminescent material centroid wavelength ^lc2may in embodiments especially be selected from the range of 610-660 nm, such as from the range of 620-645 nm, especially from the range of 625-635 nm. Hence, the second luminescent material light may be red light. In embodiments, the first luminescent converter may thus (at least) comprise the first luminescent material and the second luminescent material. Further, the first luminescent converter may have a first luminescent converter content, wherein the first luminescent converter content indicates the total amount of luminescent material(s) in the first luminescent converter. In embodiments, the first luminescent converter content of the first luminescent converter may consist for at least 70 weight percent (w / w%), such as at least 80 weight percent (w / w%), especially at least 90 weight percent (w / w%), like at least 95weight percent (w / w%) or like at least 97 weight percent (w / w%), including (essentially) 100weight percent (w / w%), of the first (green-yellow) luminescent material and the second (red) luminescent material. Additionally or alternatively, in embodiments, the first luminescent converter content of the first luminescent converter may consist for at most 99 weight percent (w / w%), such as at most 98 weight percent (w / w%), especially at most 95 weight percent (w / w%), of the first (green-yellow) luminescent material and the second (red) luminescent material. Yet, especially, at least 90 weight percent (w / w%) of the first luminescent converter content may consist of the first luminescent material and the second luminescent material.Hence, in specific embodiments, a first luminescent converter content of the first luminescentconverter may consist for at least 90 weight percent (w / w%) of the first luminescent material 2023PF80239 19 and the second luminescent material. A first luminescent converter having a first luminescent converter content consisting for at least 90 weight percent (w / w%) of the first luminescent material and the second luminescent material may facilitate providing luminescent material light comprising (mainly) green-yellow and red light. In such an embodiment, with such a light generating system, the specifically selected luminescent materials may be purposely divided over different light generating devices in a specified way such that absorption is prevented of e.g. first luminescent material light by the third luminescent material, and (thus) improving the efficiency of the light generating system. The first and second luminescent material may be combined in a single i.e. first luminescent converter, because the second luminescent material has the uniqueproperty that it does not (or hardly) absorb green-yellow light. In other words, there may beno / hardly overlap between the excitation spectrum of the second luminescent material andthe emission spectrum of the first luminescent material. For example, the overlap between theexcitation spectrum of the second luminescent material and the emission spectrum of the firstluminescent material may be at most 5% or at most 3% (or at most 1% such as 0% e.g. nooverlap at all) of the emission spectrum of the first luminescent material.In embodiments, the first luminescent converter content of the first luminescent converter may consist for at least 10 weight percent (w / w%), such as at least 20 weight percent (w / w%), especially at least 35 weight percent (w / w%), like at least 50 weight percent (w / w%), of the first luminescent material. Additionally or alternatively, in embodiments, the first luminescent converter content of the first luminescent converter may consist for at most 90 weight percent (w / w%), such as at most 80 weight percent (w / w%), especially at most 75 weight percent (w / w%), like at most 70 weight percent (w / w%), of the first luminescent material. Further, in (other) embodiments, the first luminescent converter content of the first luminescent converter may consist for at least 5 weight percent (w / w%), such as at least 10 weight percent (w / w%), especially at least 25 weight percent (w / w%), like at least 30 weight percent (w / w%), of the second luminescent material. Additionally or alternatively, in embodiments, the first luminescent converter content of the first luminescent converter may consist for at most 80 weight percent (w / w%), such as at most 70 weight percent (w / w%), especially at most 60 weight percent (w / w%), like at most 50 weight percent (w / w%), of the second luminescent material. In embodiments, the first luminescent converter content of the first luminescent converter may consist for at most 30 weight percent (w / w%), such as at most 20 weight percent (w / w%), especially at most 10 weight percent (w / w%), like at most 5 weight percent (w / w%), of luminescent material(s) other than the first luminescent 2023PF80239 20 material and the second luminescent material. In embodiments, the first luminescent converter may further comprise a light scattering material, configured to diffuse one or more of the light source light and the (first and / or second) luminescent material light received by the light scattering material. The light scattering material may be configured embedded into the first luminescent converter. In specific embodiments, the light scattering material may comprise light scattering particles, such as e.g. at least one of BaSO4, A12O3 and TiO2 particles. Further, the first luminescent converter may comprise a first matrix material, into which the (first and second) luminescent materials (and optionally the light scattering material) are configured embedded. In embodiments, the first matrix material may comprise a material selected from the group comprising glass, polycarbonate (PC), (clear) polyvinyl chloride (PVC), liquid silicone rubber (LSR), cyclic olefin copolymers (COC), fluorinated ethylene propylene (FEP), styrene methyl methacrylate (SMMA), polysiloxanes, and poly(methyl methacrylate) (PMMA). Especially, the first matrix material may comprise polydimethylsiloxane (PDMS). Turning to the second luminescent converter, the second luminescent converter may comprise a third (red) luminescent material. The third luminescent material may be any (combination) of the luminescent materials described above. Yet, especially, in embodiments the third luminescent material may comprise an oxynitride luminescent material and / or a nitride luminescent material. In embodiments, at least 50 weight percent (w / w%), such as at least 65 weight percent (w / w%), especially at least 80 weight percent (w / w%), of the third (red) luminescent material may be an oxynitride luminescent material and / or a nitride luminescent material. Further, at least 85 weight percent (w / w%), such as at least 90 weight percent (w / w%), especially at least 95 weight percent (w / w%), including (essentially) 100 weight percent (w / w%), of the third (red) luminescent material may be an oxynitride luminescent material and / or a nitride luminescent material. Hence, in specific embodiments, (essentially) 100 weight percent (w / w%) of the third (red) luminescent material may be an oxynitride luminescent material and / or a nitride luminescent material, i.e., the third luminescent material may (essentially) consist of an oxynitride luminescent material and / or a nitride luminescent material. In alternative embodiments, at most 95% weight percent (w / w%), such as at most 90 weight percent (w / w%), especially at most 80 weight percent (w / w%), like at most 75 weight percent (w / w%), of the third (red) luminescent material may be an oxynitride luminescent material and / or a nitride luminescent material. In embodiments, the weight percent (w / w%) of the third luminescent material not consisting of an oxynitride luminescent material and / or a nitride luminescent material may consist of a 2023PF80239 21 (combination of) luminescent material(s) selected from the luminescent materials described above, such as especially a (combination of) luminescent material(s) configured to convert (part of) the second light source light into red light. In embodiments, the third (red) luminescent material, such as especially the nitride luminescent material, may comprise (Ba,Sr,Ca)AlSiN3:Eu. Additionally or alternatively, the third (red) luminescent material, such as especially the nitride luminescent material, may comprise (Ba,Sr,Ca)2Si5N8:Eu. Additionally or alternatively, the third (red) luminescent material, such as especially the oxynitride luminescent material, may comprise Si6–zAlzOzN8–z:Pr, wherein 0 ≤ z ≤ 4, such as 0 ≤ z ≤ 3, especially 0 ≤ z ≤ 2. Si6–zAlzOzN8–z:Pr may further be indicated as Si6-zAlzOzN8-z:Prx, wherein 0.005 ≤ x ≤ 0.03, such as 0.01 ≤ x ≤ 0.025, especially 0.012 ≤ x ≤ 0.02,wherein in specific embodiments x = 0.016. Additionally or alternatively, the third (red)luminescent material, such as especially the oxynitride luminescent material, may comprise (Sr1-xEux)αSiβAlγOδNω, wherein 0 < x <1, 0 < α ≤ 3, 5 ≤ β ≤ 7, 3 ≤ γ ≤ 5, 0.5 ≤ δ ≤ 0.8, and 5 ≤ ω ≤ 15. Hence, in specific embodiments, the third luminescent material may comprise one or more of: (i) (Ba,Sr,Ca)AlSiN3:Eu, (ii) (Ba,Sr,Ca)2Si5N8:Eu, (iii) Si6–zAlzOzN8–z:Pr, wherein 0 ≤ z ≤ 2, and (iv) (Sr1-xEux)αSiβAlγOδNω, wherein 0 < x <1, 0 < α ≤ 3, 5 ≤ β ≤ 7, 3 ≤ γ ≤ 5, 0.5 ≤ δ ≤ 0.8, and 5 ≤ ω ≤ 15. Such luminescent materials may have a relatively high (thermal) stability. Further, such luminescent materials may have a relatively low absorption coefficient at the first and / or second luminescent material centroid wavelength ^lc1, ^lc2. Hence, absorption of first and / or second luminescent material light by the third luminescent material may be minimized. In embodiments, the third (red) luminescent material may be configured to emit third luminescent material light, especially upon excitation with (blue) second lightsource light. That is, the third luminescent material may be configured to convert part of thesecond light source light into third (red) luminescent material light. In embodiments, the third luminescent material may be configured to convert (on a spectral power basis) ≥ 25%, such as ≥ 35%, especially ≥ 50%, like ≥ 70%, of the second light source light received by the third luminescent material into third luminescent material light. Further, the third luminescent material may be configured to convert (on a spectral power basis) ≥ 75%, such as ≥ 85%, especially ≥ 95%, including (essentially) 100%, of the second light source light received by the third luminescent material into third luminescent material light. Additionally or alternatively, in embodiments, the third luminescent material may be configured to convert(on a spectral power basis) ≤ 95%, such as ≤ 80%, especially ≤ 70%, like ≤ 60%, of thesecond light source light received by the third luminescent material into third luminescent 2023PF80239 22 material light. In embodiments, the third (red) luminescent material light may have a third luminescent material centroid wavelength ^lc3. The third luminescent material centroid wavelength ^lc3 may in embodiments especially be selected from the range of 590-680 nm, such as from the range of 600-660 nm, especially from the range of 600-650 nm, like from the range of 610-640 nm. Hence, the third luminescent material light may be orange light and / or red light. Especially, in embodiments, the third luminescent material light may be orange-red light. In such embodiments, the third luminescent material centroid wavelength ^lc3 may be selected from the range of 590-635 nm, such as from the range of 595-630 nm, especially from the range of 600-625 nm, like from the range of 605-620 nm. Alternatively, the third luminescent material light may be red light. In such embodiments, the third luminescent material centroid wavelength ^lc3may be selected from the range of 620-680 nm, such as from the range of 630-670 nm, especially from the range of 635-660 nm, like from the range of 635-650 nm. Hence, in specific embodiments, the third luminescent material centroid wavelength ^lc3 may be selected from the range of 600-625 nm or selected from the range of 635-660 nm. Such a third luminescent material centroid wavelength ^lc3 may provide the benefit that the third (red) luminescent material may provide either orange- red light or red light. Further, such a third luminescent material centroid wavelength ^lc3 may provide the benefit that (orange-)red third luminescent material light may be provided having a different centroid wavelength than (the second luminescent material centroid wavelength ^lc2 of) the second luminescent material light. Hence, in embodiments, both the second luminescent material light and the third luminescent material light may be red light, yet the third luminescent material light may have a more orange color (600 ≤ ^lc3 ≤ 625 nm) or a more (deeper) red color (635 ≤ ^lc3 ≤ 660 nm) than the second luminescent material light. As such, the color rendering index of the system light towards different shades of red is improved. Further, in embodiments, the second luminescent material light may have a relatively narrow bandwidth, and the third luminescent material light may broaden the bandwidth of the system light in the (orange-)red wavelength region. In embodiments, the second luminescent converter may comprise (the third) luminescent material in a certain amount. Especially, the second luminescent converter may have a second luminescent converter content, wherein the second luminescent converter content indicates the total amount of luminescent material(s) in the second luminescent converter. In embodiments, the second luminescent converter content of the second luminescent converter may consist for at least 70 weight percent (w / w%), such as at least 80 2023PF80239 23 weight percent (w / w%), especially at least 90 weight percent (w / w%), like at least 95 weight percent (w / w%), including (essentially) 100 weight percent (w / w%), of the third (red) luminescent material. Additionally or alternatively, in embodiments, the second luminescent converter content of the second luminescent converter may consist for at most 99 weight percent (w / w%), such as at most 98 weight percent (w / w%), especially at most 95 weight percent (w / w%), of the third (red) luminescent material. Yet, especially, at least 90 weight percent (w / w%) of the second luminescent converter content may consist of the third luminescent material. Hence, in specific embodiments, a second luminescent converter content of the second luminescent converter may consist for at least 90 weight percent (w / w%) of the third luminescent material. A second luminescent converter having a second luminescent converter content consisting for at least 90 weight percent (w / w%) of the third luminescent material may facilitate providing luminescent material light comprising (mainly) (orange-)red light. Further, such a second luminescent converter may have as benefit that (essentially) only one luminescent material needs to be added to the second luminescent converter. In embodiments, the second luminescent converter content of the second luminescent converter may consist for at most 20 weight percent (w / w%), such as at most 15 weight percent (w / w%), especially at most 10 weight percent (w / w%), like at most 5 weightpercent (w / w%), of luminescent material(s) other than the third luminescent material. Inembodiments, the second luminescent converter may further comprise a light scattering material, configured to diffuse one or more of the second light source light and the third luminescent material light received by the light scattering material. The light scattering material may be configured embedded into the second luminescent converter. Further, the second luminescent converter may comprise a second matrix material, into which the third luminescent material (and optionally the light scattering material) are configured embedded. In embodiments, the second matrix material may comprise a material selected from the group comprising glass, polycarbonate (PC), (clear) polyvinyl chloride (PVC), liquid silicone rubber (LSR), cyclic olefin copolymers (COC), fluorinated ethylene propylene (FEP), styrene methyl methacrylate (SMMA), polysiloxanes, and poly(methyl methacrylate) (PMMA). Especially, the second matrix material may comprise polydimethylsiloxane (PDMS). Returning to the first light generating device, the first light generating device may be configured to generate first device light. In embodiments, the first device light may comprise the first light source light. Additionally or alternatively, in embodiments, the first device light may comprise the first luminescent material light and the second luminescent material light. Especially, in embodiments, the first device light may have a spectral power 2023PF80239 24 distribution in the (visible) wavelength range of 380-780 nm, with part of the spectral power provided by the first light source light, and part of the spectral power provided by the first luminescent material light and the second luminescent material light. In embodiments, the first light source light may provide at maximum 50%, such as at maximum 40%, especially at maximum 30%, like at maximum 20%, of the spectral power of the first device light (in the wavelength range of 380-780 nm). Additionally or alternatively, in embodiments, the first light source light may provide at least 2%, such as at least 5%, especially at least 10%, like at least 15%, of the spectral power of the first device light (in the wavelength range of 380-780 nm). Embodiments wherein at least 2% of the spectral power of the first device light is provided by the first light source light may provide the benefit that white first device light may be provided (see below). Yet, in (other) embodiments, the first luminescent converter may be configured to convert (essentially) all of the first light source light into (at least) first and second luminescent material light. In such embodiments, the first device light may have a spectral power distribution in the wavelength range of 380-780 nm, with at most 10%, such as at most 5%, especially at most 2%, like at most 1%, including (essentially) 0%, of the spectral power provided by the first light source light. Further, in embodiments, at least 50%, such as at least 60%, especially at least 70%, of the spectral power of the first device light in the wavelength range of 380-780 nm may be provided by the first luminescent material light and the second luminescent material light. Further yet, in embodiments, at least 80%, such as at least 90%, especially at least 95%, including (essentially) 100%, of the spectral power of the first device light in the wavelength range of 380-780 nm may be provided by the first luminescent material light and the second luminescent material light. Yet, in (alternative) embodiments, at most 95%, such as at most 90%, especially at most 80%, of the spectral power of the first device light in the wavelength range of 380-780 nm may be provided by the first luminescent material light and the second luminescent material light. Hence, in specific embodiments, the first device light may have a spectral power distribution in the wavelength range of 380-780 nm, with at maximum 30% of the spectral power provided bythe first light source light and at least 70% of the spectral power provided by the firstluminescent material light and the second luminescent material light. Such a (30:70) distribution of first light source light and first and second luminescent material light may especially provide white first device light, such as especially (white) first device light having a color point above the BBL. As indicated above, in embodiments, the first light source light may be blue light. Further, as indicated above, the first luminescent material light may be green-yellow 2023PF80239 25 light, and the second luminescent material light may be red light. Hence, in embodiments, the first device light may comprise a blue component, a green-yellow component, and a red component. In such embodiments, 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 1800 K and 20000 K, such as between 2000 and 20000 K, especially 2700-20000 K, for general lighting especially in the range of about 2000-7000 K, such as in the range of 2700-6500 K. In embodiments, e.g. for backlighting purposes, or for other purposes, the correlated color temperature (CCT) may especially be in the range of about 7000-20000 K. Yet further, in embodiments the correlated color temperature (CCT) is especially within about 15 SDCM (standard deviation of color matching) from the BBL (black body locus), especially within about 10 SDCM from the BBL, even more especially within about 5 SDCM from the BBL. In embodiments, the first device light may be white light having a CCT selected from the range of 2500-8000 K, such as from the range of 2700-7000 K, especially from the range of 3000-6000 K. Especially, in the first operational mode of the light generating system, the first device light may be white light having a CCT selected from the range of 2500-8000 K, such as from the range of 2700-7000 K, especially from the range of 3000-6000 K. Further, in the first operational mode of the light generating system, the first device light may have a color point above the black body locus (BBL). That is, in a CIE 1931 chromaticity diagram, the color point of the first device light may have x,y-coordinates located above the line of the Planckian locus (or curve of the BBL). In embodiments, the color point of the first device light may have a distance to the BBL of at least 5 SDCM, such as at least 10 SDCM, especially at least 15 SDCM. Additionally or alternatively, in embodiments, the color point of the first device light may have a distance to the BBL of at most 25 SDCM, such as at most 20 SDCM, especially at most 15 SDCM, like at most 10 SDCM. Hence, in specific embodiments, in the first operational mode of the light generating system, the first device light may have a color point above the black body locus with a distance to the BBL of at least 10 SDCM. Such first device light may have as advantage that, upon admixing the first device light with the second device light (having a color point below the BBL, see below), system light within at most 10 SDCM, such as within at most 5 SDCM, of the BBL may be provided. In (other) embodiments, as indicated above, the first luminescent converter (especially the first and second luminescent materials) may be configured to convert (essentially) all of the first light source light received by the first luminescent converter into 2023PF80239 26 (first and second) luminescent material light. In such embodiments, at most 5%, especially at most 2% of the spectral power of the first device light (in the wavelength range of 380-780 nm) may be provided by the first light source light. Further, in such embodiments, the first device light may be colored light. Hence, in a (second) operational mode of the light generating system, the first device light may be colored light. Especially, the first device light may be colored light having a centroid wavelength selected from the range of 510-635 nm, such as from the range of 525-625 nm, especially from the range of 540-600 nm. Hence, in embodiments, the first device light may be green light, yellow light, orange light, or red light. Similar to the first light generating device, the second light generating device may be configured to generate second device light. In embodiments, the second device light may comprise the second light source light. Additionally or alternatively, in embodiments, the second device light may comprise the third (red) luminescent material light. Especially, in embodiments, the second device light may have a spectral power distribution in the (visible) wavelength range of 380-780 nm, with part of the spectral power provided by the second light source light, and part of the spectral power provided by the third luminescent material light. In embodiments, the second light source light may provide at maximum 50%, such as at maximum 40%, especially at maximum 30%, like at maximum 20%, of the spectral power of the second device light (in the wavelength range of 380-780 nm). Additionally or alternatively, in embodiments, the second light source light may provide at least 2%, such as at least 5%, especially at least 10%, like at least 15%, of the spectral power of the second device light (in the wavelength range of 380-780 nm). Embodiments wherein at least 2% of the spectral power of the second device light is provided by the second light source light may provide the benefit that white second device light may be provided (see below). Further, embodiments wherein at least 2% of the spectral power of the second device light is provided by the second light source light may provide the benefit that the second device light may comprise a blue component, which may increase the CCT and / or CRI of the system light (comprising the second device light). Yet, in embodiments, the second luminescent converter (especially the third luminescent material) may be configured to convert (essentially) all of the second light source light into (third) luminescent material light. In such embodiments, the second device light may have a spectral power distribution in the wavelength range of 380- 780 nm, with at most 10%, such as at most 5%, especially at most 2%, like at most 1%, including (essentially) 0%, of the spectral power provided by the second light source light. In embodiments, both the first luminescent converter and the second luminescent converter may be configured to convert (essentially) all of the first and second light source light, 2023PF80239 27 respectively, into luminescent material light. That is, in embodiments, at most 5%, especially at most 2%, of the spectral power of the first device light (in the wavelength range of 380- 780 nm) may be provided by the first light source light, and at most 5%, especially at most 2%, of the spectral power of the second device light (in the wavelength range of 380-780 nm) may be provided by the second light source light. Alternatively, one of the (first and second) luminescent converters may be configured to convert (only) part of the respective light source light, such that for one of the first and second device light applies that at least 2%, such as at least 5%, of the spectral power of said device light (in the wavelength range of 380-780 nm) may be provided by the respective light source light. Hence, in specific embodiments, one of the following may apply: (a) the first light generating device may be configured to generate first device light having a spectral power distribution in the wavelength range of 380-780 nm with at most 2% of the spectral power provided by the first light source light, and (b) the second light generating device may be configured to generate second device light having a spectral power distribution in the wavelength range of 380-780 nm with at most 2% of the spectral power provided by the second light source light. Embodiments wherein one of the first and second device lights is (essentially) free from light source light may provide the benefit that, if needed, the light generating system may be controlled such that the system light may (essentially) not comprise blue light. Such configurations may e.g. be useful in cleanrooms and / or (photography) darkrooms, where blue light may cause damage and / or unwanted effects to materials. Further, device light wherein at most 2% of the spectral power is provided by light source light may provide the benefit that colored device light may be provided. Yet, in (other) embodiments, both the first device light and the second device light may have a spectral power distribution in the wavelength range of 380-780 nm, with at least 2%, such as at least 5%, of the spectral power provided by the first and second light source light, respectively. Hence, in embodiments, at most 95%, such as at most 90%, especially at most 80%, of the spectral power of the second device light in the wavelength range of 380-780 nm may be provided by the third luminescent material light. Additionally or alternatively, in embodiments, at least 50%, such as at least 60%, especially at least 70%, of the spectral power of the second device light in the wavelength range of 380-780 nm may be provided by the third luminescent material light. Further yet, in embodiments, at least 80%, such as at least 90%, especially at least 95%, including (essentially) 100%, of thespectral power of the second device light in the wavelength range of 380-780 nm may beprovided by the third luminescent material light. Hence, in specific embodiments, the second 2023PF80239 28 device light may have a spectral power distribution in the wavelength range of 380-780 nm, with at maximum 30% of the spectral power provided by the second light source light and atleast 70% of the spectral power provided by the third luminescent material light. Such a(30:70) distribution of second light source light and third luminescent material light may especially provide (white or colored) second device light having a color point below the BBL. Further, second device light comprising a red and a blue component (and not comprising a green(-yellow) component) may be beneficial for e.g. agricultural applications, such as horticulture applications, where a combination of blue and red light may improve the growth and yield of crops. As indicated above, in embodiments, the second light source light may be blue light. Further, as indicated above, the third luminescent material light may be orange and / or red light. Hence, in embodiments, the second device light may comprise a blue componentand an (orange-)red component. In embodiments, the second device light may thus becolored light. Especially, the second device light may be purple light, wherein the color purple is a non-spectral color originating from the combination of blue and red light. Further, in embodiments wherein the second light source light provides at most 2% of the spectral power of the second device light (in the wavelength range of 380-780 nm), the second device light may be red light. Alternatively, the second light source light may have a second light source centroid wavelength λsc2 selected from the range of about 478-490 nm, wherein the second light source light provides at least 5%, such as at least 10%, of the spectral power of the second device light (in the wavelength range of 380-780 nm), and wherein the second device light comprises white light. In such embodiments, the second device light may have a CCT selected from the range of 4000-20000 K, such as from the range of 4500-20000 K, especially from the range of 5000-20000 K. Further, in embodiments, the second device light may have a color point below the black body locus with a distance to the BBL of at least 5 SDCM, such as at least 10 SDCM, especially at least 15 SDCM. Additionally or alternatively, in embodiments, the color point of the second device light may have a distance to the BBL of at most 25 SDCM, such as at most 20 SDCM, especially at most 15 SDCM, like at most 10 SDCM. In embodiments, the light generating system may further comprise one or more additional light generating devices, such as (one or more) third light generating devices, (one or more) fourth light generating devices, etc.. In embodiments, the one or more additional light generating devices may each be configured to generate respective (third, fourth, etc.) device light. Further, in embodiments, the one or more additional light 2023PF80239 29 generating devices may each comprise a (third, fourth, etc.) light source, wherein the (third, fourth, etc.) light source is selected to be the same (type of) light source as the first light source (and / or the second light source). Alternatively, the (third, fourth, etc.) light sources of the additional light generating devices may be different from the first light source (and / or the second light source), such as e.g. differing in the light source centroid wavelength λsc. For instance, the (third, fourth, etc.) light sources may be configured to provide green light source light, or one (or more) of yellow, orange, and red light source light. Additionally, in embodiments, the one or more additional light generating devices may each comprise a (third, fourth, etc.) luminescent converter, comprising one or more luminescent materials selected from the luminescent materials indicated above. As indicated above, the light generating system may be configured to generate system light. In embodiments, the system light may comprise one or more of the first device light and the second device light. Further, in embodiments, the system light may comprise one or more of the third device light, the fourth device light, etc.. As indicated above, in embodiments, the first device light may (in a first operational mode of the light generating system) be white light. Hence, in a first operational mode of the light generating system, the system light may at least comprise the (white) first device light (and optionally the second device light). Further, in the first operational mode of the light generating system, the system light may be white light. In embodiments, the system light may consist of the first device light, such that the (white) system light may have a CCT selected from the range of 2500- 8000 K, such as from the range of 2700-7000 K, especially from the range of 3000-6000 K, and optionally a color point having a distance to the BBL of at least 5 SDCM, such as at least 10 SDCM, especially at least 15 SDCM. Yet, in alternative embodiments, (in the first operational mode) the system light may comprise the first device light and the second device light (and optionally the third device light, fourth device light, etc.). In such embodiments, (purple) second device light may be admixed with the (white) first device light, providing (white) system light having a correlated color temperature (CCT) selected from the range of 1500-8000 K, such as from the range of 2000-6500 K, especially from the range of 2700- 4000 K, like from the range of 3000-3500 K. Hence, in specific embodiments, in the first operational mode of the light generating system, the system light may be white light having a correlated color temperature in a range from 1500-8000 K, such as in a range from 2000- 6500 K, especially in a range from 2700-4000 K, like in a range from 3000-3500 K. Further, in embodiments, the system light may have a color rendering index (CRI). Especially, in embodiments, in the first operational mode of the light generating system, the (white) system 2023PF80239 30 light may have a CRI selected from the range of at least 70, such as from the range of at least 80, especially from the range of at least 85, like from the range of at least 90, more especiallyfrom the range of at least 95. Hence, in specific embodiments, in the first operational mode ofthe light generating system the system light may have a correlated color temperature selected from the range of 2700-4000 K and a color rendering index of at least 85. Such system light may be suitable for general lighting applications, where a good representation of colors is desired. In embodiments, the (purple) second device light may have a color point below the black body locus, and the (white) first device light may have a color point above the black body locus (see above). In such embodiments, admixing the first device light and the second device light in the system light (such as in the first operational mode) may result in a system light having a color point located closer to the BBL than the color points of the first device light and / or the second device light. Especially, in embodiments, the system light may have a color point having a distance to the BBL of at most 10 SDCM, such as at most 7 SDCM, especially at most 5 SDCM, like at most 2 SDCM. Further, in embodiments, the system light may be colored light. Especially, in embodiments, the light generating system may have a (second) operational mode, wherein in the (second) operational mode the light generating system is configured to generate colored system light. In embodiments, the colored system light may comprise one or more of the first device light and the second device light. For instance, as indicated above, the first device light may be colored light, wherein the system light may comprise at least the first device light. Alternatively, both the first device light and the second device light may be colored light, wherein the colored system light may comprise (a combination of) the first device light and the second device light. In specific embodiments, the first device light may be green-yellow light, the second device light may be red light, and a third device light may be blue light, such that in a (second) operational mode the system light may be colored light having a color point selected from the RGB (red-green- blue) color space. In embodiments, the light generating system may (further) have at least one operational mode wherein the system light consists of first device light (and wherein the second light generating devices may e.g. be in an off-state). Additionally or alternatively, the light generating system may have at least one operational mode wherein the system light consists of second device light (and wherein the first light generating devices may e.g. be in an off-state). Hence, in a (third) operational mode of the light generating system, the system light may comprise one of the first device light and the second device light, and may not comprise the other of the first device light and the second device light. 2023PF80239 31 In embodiments, one or more of the color point, CCT, CRI, and intensity of the system light may be controlled and / or adjusted by a control system. Hence, in embodiments, the light generating system may comprise a control system. The control system may especially be configured to control the N first light generating devices and M second light generating devices (and the optional additional light generating devices). The term “controlling” and similar terms especially refer at least to determining the behavior or supervising the running of an element. Hence, herein “controlling” and similar terms may e.g. refer to imposing behavior on the element, such as e.g. measuring, displaying, actuating, opening, shifting, changing temperature, etc.. Beyond that, the term “controlling” and similar terms may additionally include monitoring. Hence, the term “controlling” and similar terms may include imposing behavior on an element and also imposing behavior on an element and monitoring the element. The controlling of the element can be done with a control system, which may also be indicated as “controller”. The control system and the element may thus at least temporarily, or permanently, functionally be coupled. The element may comprise the control system. In embodiments, the control system and element may not be physically coupled. Control can be done via wired and / or wireless control. The term “control system” may also refer to a plurality of different control systems, which especially are functionally coupled, and of which e.g. one control system may be a master control system and one or more others may be slave control systems. 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. In embodiments, the control system may be controlled via an App on a device, such as a portable device, like a Smartphone or I- phone, a tablet, etc.. The device is thus not necessarily coupled to the light generating system, but may be (temporarily) functionally coupled to the light generating system. In such embodiments the control system of the light generating system may be a slave control system or control in a slave mode. The light generating 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. The system, or apparatus, or device may execute an action in a “mode” or “operation mode” or “mode of operation” or “operational mode”. The term “operational mode may also be indicated as “controlling mode”. Likewise, in a method an action or stage, or step may be executed in a “mode” or “operation mode” or “mode of operation” or“operational mode”. This does not exclude that the system, or apparatus, or device may alsobe adapted for providing another controlling mode, or a plurality of other controlling modes. 2023PF80239 32 Likewise, this may not exclude that before executing the mode and / or after executing the mode one or more other modes may be executed. However, in embodiments a control system may be available, that is adapted to provide at least the controlling mode. Would other modes be available, the choice of such modes may especially be executed via a user interface, though other options, like executing a mode in dependence of a sensor signal or a (time) scheme, may also be possible. The operation mode may in embodiments also refer to a system, or apparatus, or device, that can only operate in a single operation mode (i.e. “on”,without further tunability). In embodiments, the control system may control in dependence ofone 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. Hence, in embodiments, the control system may be configured to control the N first light generating devices and M second light generating devices in dependence of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer. In embodiments, the control system may be configured to control the intensity of the first device light and / or of the second device light (and / or of the third, fourth, etc. device light). Further, the control system may be configured to control the optical properties of the system light (by changing the relative intensities of the (first, second, third, etc.) device lights), such as e.g. the correlated color temperature and / or the color rendering index. Especially, in embodiments, the control system may be configured to (in the first operational mode of the light generating system) maintain the correlated color temperature in a range of 1500-8000 K, such as in a range of 2000-6500 K, especially in a range of 2700-4000 K, like in a range of 3000-3500 K (by controlling the N first light generating devices and M second light generating devices). Additionally or alternatively, in embodiments, the control system may be configured to (in the first operational mode of the light generating system) maintain the color rendering index at at least 70, such as at least 80, especially at least 85, like at least 90, more especially at least 95. Hence, in specific embodiments, the light generating system may further comprise a control system, configured to control the N first light generating devicesand M second light generating devices in dependence of one or more of an input signal of auser interface, a sensor signal, and a timer; wherein in a first operational mode of the light generating system the control system may be configured to one or more of: (a) maintain the correlated color temperature in a range of 2000-6500 K, and (b) maintain the color rendering index at at least 80. A light generating system comprising such a control system may facilitate providing system light having stable optical properties. Further, with such a control system, a user may relatively easily program and / or operate the light generating system 2023PF80239 33 (remotely), without having to program and / or operate each first and second light generating device separately. Hence, a light generating system comprising (such) a control system may be more user friendly. In embodiments, the control system may be configured to determine a relativecontribution of the first luminescent material light to the system light (e.g. using an opticalsensor or optical performance data); wherein the control system may be configured to (i)maintain a color point of the system light within 7 SDCM (or within 5 SDCM) and / or (ii)maintain the correlated color temperature of the system light within 300 K (or within 200K)by controlling and varying the amount of the second device light generated by the secondlight generating device. The obtained effect is improved reliability. The reason that the firstluminescent material is susceptible to degradation, thus its (relative) contribution in the firstdevice light, which can be compensated by the second device light e.g. one may increase thecontribution of the second device light in the system light over (life)time.In embodiments, in the first operational mode of the light generating system the first device light may have a color point above the black body locus with a distance to the BBL of at least 10 SDCM; wherein second device light may have a color point below the black body locus with a distance to the BBL of at least 10 SDCM; wherein admixing the firstdevice light and the second device light in the system light (e.g. in the first operational mode)may result in system light having a color point located closer to the BBL (e.g. within 7SDCM of the BBL) than the color points of the first device light and / or the second devicelight. The first light source and second light source are briefly discussed above. Here, some general embodiments of the (first and second) light source are provided. The term “light source” may in principle relate to any light source known in the art. In a specific embodiment, the light source comprises a solid state light source (such as a light emitting diode (LED) or laser diode (or “diode laser”)). The term “light source” may also relate to a plurality of (essentially identical (or different)) light sources, such as 2-2000 (solid state) (LED) light sources. The phrases “different light sources” or “a plurality of different light sources”, and similar phrases, may in embodiments refer to a plurality of solid-state light sources selected from at least two different bins. Likewise, the phrases “identical light sources” or “a plurality of same light sources”, and similar phrases, may in embodiments refer to a plurality of solid-state light sources selected from the same bin. Hence, the term LED may also refer to a plurality of LEDs. Further, the term “light source” may in embodiments also refer to a so-called chip-on-board (COB) light source. The term “COB” 2023PF80239 34 especially refers 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 source may be configured on the same substrate. In embodiments, a COB is a multi LED chip configured together as a single lighting module. 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 “µLEDs”. 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 fromthe range of 100 µm – 1 mm. Herein, the term µ size or micro LED especially refers to solidstate light sources having dimensions, such as die dimensions, especially length and width, selected from the range of 100 µm and smaller. The term “light source” may refer to a semiconductor light-emitting device, such as a light emitting diode (LED), a resonant cavity light emitting diode (RCLED), a vertical-cavity surface-emitting laser (VCSEL) or “vertical cavity laser diode”, 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 anembodiment, the light source comprises an 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”, or “solid state material light source”, and similar terms, may refer to semiconductor light sources, such as a light emitting diode (LED), a laser diode, or a superluminescent diode. The term “light source” may also refer to a multi-junction LED. In embodiments, the light source may comprise one or more micro-optical elements (array of micro lenses) downstream of a single solid-state light source, such as an LED, 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 an LED with on-chip optics. In embodiments, the light source comprises pixelated single LEDs (with or without optics) (offering in embodiments on-chip beam steering). 2023PF80239 35 In embodiments, the light source may be configured to provide primary radiation, which is used as such, such as e.g. a blue light source, like a blue LED, or a green light source, such as a green LED, and a red light source, such as a red LED. Such LEDs, which may not comprise a luminescent material (“phosphor”) may be indicated as direct color LEDs. In other embodiments, however, the light source may be configured to provide primary radiation and part of the primary radiation is converted into secondary radiation. Secondary radiation may be based on conversion by a luminescent material. The secondary radiation may therefore also be indicated as luminescent material radiation. The luminescent material may in embodiments be comprised by the light source, such as an LED with a luminescent material layer or dome comprising luminescent material. Such LEDs may be indicated as phosphor converted LEDs or PC LEDs (phosphor converted LEDs). In other embodiments, the luminescent material may be configured at some distance (“remote”) from the light source, such as an LED with a luminescent material layer not in physical contact with a die of the LED. Hence, in specific embodiments the light source may be a light source that during operation emits at least light at wavelength selected from the range of 380-470 nm. However, other wavelengths may also be possible. This light may partially be converted by the luminescent material. In embodiments, the light generating device may comprise a luminescent material, such as especially in the luminescent converter. In embodiments, the light generating device may comprise a PC LED. In other embodiments, the light generating device may comprise a direct LED (i.e. no phosphor). In embodiments, the light generating device may comprise a laser device, like a laser diode. In embodiments, the light generating device may comprise a superluminescent diode. Hence, 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. 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. The term “light source” may (thus) 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 of a luminescent material comprising element and (other) optics, like a lens, a collimator. In embodiments, the term “light source” may thus 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. Especially, 2023PF80239 36 the term “light generating device” may be used to address a light source and further (optical components), like a luminescent converter, an optical filter and / or a beam shaping element, etc. Further, the term “light source” may (thus) in embodiments also refer to a light source that is (also) based on conversion of light, such as a light source in combination with a luminescent converter material. A light converter element (“converter element” or “converter”) may comprise a luminescent material comprising element. For instance, a solid state light source as such, like a blue LED, is a light source. A combination of a solid state light source (as light generating element) and a light converter element, such as a blue LED and a light converter element, optically coupled to the solid state light source, may also be a light source (but may also be indicated as light generating device). Hence, a white LED is a light source (but may e.g. also be indicated as (white) light generating device). Especially, the term “light generating device” is herein used to refer to a combination of a light source and a luminescent converter. Further, in embodiments, the first light generating device and / or the second light generating device may be light emitting diodes (LEDs). In such embodiments, the luminescent converter may be added as a (thin) coating on the LED die. Additionally or alternatively, the first light generating device and / or the second light generating device may be chip-on-board (CoB) devices, wherein the luminescent converter may be configured op top of (and optionally surrounding) the substrate-mounted light source. Especially, the light source (such as an LED) and the luminescent converter may together form a LED package. Hence, in specific embodiments, the invention may provide a light generating system comprising KSiF white and (oxy)nitride red LED packages. Further, in specific embodiments, the first light generating devices and the second light generating devices may be individually selected from the group of light emitting diodes (LEDs) and chip-on-board devices. First and second light generating devices selected from the group of LEDs and CoB devices may provide the benefit that the first and second light generating devices may be relatively compact. Further, in embodiments, CoB devices may provide a better light uniformity compared to e.g. chip scale packaged (CSP) devices. In embodiments, the LEDs and / or CoB devices comprising the first and / or second light generating devices may be mounted on a LED strip. Hence, in embodiments, the light generating system may comprise a LED strip. A LED strip may also be referred to as a LED filament. LED filaments as such are known, and are e.g. described in US 8,400,051 B2, WO2020016058, WO2019197394, etc., which are hereby herein incorporated by reference. In general, a LED filament may in embodiments comprise (i) a plurality of LEDs, arranged 2023PF80239 37 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, wherein the LEDs may comprise the first and / or second (and / or third, fourth, etc.) light generating devices. Hence, the LEDs (of the LED filament) may comprise the first and / or second (and / or third, fourth, etc.) light sources, wherein the first and / or second (and / or third, fourth, etc.) luminescent converters (respectively) are configured on top of said respective light sources, to form the LEDs comprising the first and / or second (and / or third, fourth, etc.) light generating devices. The LED filament may in embodiments be defined by a filament length LF, a filament width WF, and a filament thickness TF. In some embodiments, the LED filament may be straight. In other embodiments, 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. In further embodiments, the LED filament may be flexible, such as comprise a flexible carrier, wherein the LED filament may have an adjustable shape. Further, the LED filament may have relatively high aspect ratios (LF / WF or LF / TF), such as at least 10, especially at least 15, such as at least 20, more especially at least 50. Large aspect ratios may better mimic a filament. Yet, in embodiments, the aspect ratio (LF / WF and / or LF / TF) may be at most 900, such as at most 650, especially at most 500. Hence, in specific embodiments, 10*WF≤ LF≤ 900*WF, and 10*TF≤ LF≤ 900*TF. Further, as indicated, the LED filament may comprise an elongated carrier, first and / or second (and / or third, fourth, etc.) light generating devices (for instance LEDs), and an encapsulant. Especially, the elongated carrier may support the LEDs. 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 may be light transmissive, translucent, or transparent for light, especially visible light. Alternatively, in embodiments, the carrier may be light reflective, especially reflective for one or more of the device light and the LED filament light (see below), such as reflective for at least the device light and the LED filament 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 LEDs may be arranged on at least one of these surfaces. Hence, in embodiments, at least part of, such as all of, the LEDs may be mounted onto the first major surface. Additionally or alternatively, at least part of the LEDs may be mounted 2023PF80239 38 onto the second major surface. Hence, in embodiments, the LEDs 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. The LEDs may be arranged in an array (on the elongated carrier), especially over (at least part of) the filament length LF. The number of LEDs in the array may be at least 4, such as at least 8, even more especially at least 12, and may e.g. be up to 100, or yet even larger. Especially, in embodiments the number of LEDs in the array may be selected from therange of 10-2000, such as from the range of 10-1500, especially from the range of 10-1000.In embodiments, the LEDs may be configured in a 1D (linear) array over at least part of the filament length LF. A first and a last LED may, when measured along the LED filament, have a mutual distance of at least 0.5*LF, even more especially at least 0.7*LF. Further, in embodiments, the LEDs may be configured in two 1D arrays, one on the first major surface of the elongated carrier and one on the second major surface. In such embodiments, the LEDs on the first major surface may comprise e.g. the first light sources of the first light generating devices, and the LEDs on the second major surface may comprise the second light sources of the second light generating devices, wherein the LED filament comprises a first encapsulant configured on the first major surface and comprising the first luminescent converter, and asecond encapsulant configured on the second major surface and comprising the secondluminescent converter. 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 in embodiments 1 or in embodiments 2, and m may be selected from the range of larger than n, such as especially selected from the range of at least 4 (when n<4), like at least 6, such as at least 8. Hence, a 2D array of solid state light sources may especially 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. In embodiments, the LED filament may comprise an encapsulant. The encapsulant may especially (at least partly) cover the LEDs. Further, the encapsulant may (at least partly) cover at least part of the elongated carrier, such as at least (part of) one of the first major and second major surface. In general, the encapsulant may be in contact with the elongated carrier and may cover all of the LEDs. Hence, in embodiments the encapsulant may be configured over a substantial part of the filament length LFof the LED filament (such as over more than 70% of the filament length LF). The encapsulant may be a continuous coating along the filament length LF, at one or both of the first major and the second major surface. Further, the encapsulant may at least partly cover the LEDs, such as in embodiments 2023PF80239 39 at least 50% of the total number of LEDs in the array, such as at least 75%, especially at least 95%, up to 100%. In embodiments, the encapsulant may comprise a light scattering material. The light scattering material may especially be configured embedded in an encapsulant material, e.g. a (flexible) polymer material (such as a silicone). Further, in embodiments, the 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, such as e.g. at least one of BaSO4, A12O3and TiO2particles. In embodiments, the encapsulant may (further) comprise a light converter material, such as the first and / or second luminescent converter (see above). In embodiments, the LED filament may be configured to generate filament light, which may comprise one or more of the first device light and the second device light (and the third device light, the fourth device light, etc.). The term “LED filament light” may refer to the light emitted by the LED filament during operation of the LED filament. In embodiments, the LED filament light may be the system light, though this need not be the case. In embodiments, the LED filament may comprise multiple sub-filaments. For instance, a first sub-filament may comprise the first light generating devices (as LEDs), and a second sub-filament may comprise the second light generating devices (as LEDs). In embodiments, the light generating devices (configured as LEDs) in the LED filament may be individually controllable. Alternatively, the light generating devices in the LED filament may be divided over one or more subsets (such as over one or more sub-filaments), wherein each subset of light generating devices may be individually controllable. The light generating system may 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, automotive applications, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, digital projection, or 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. 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 2023PF80239 40 comprise a housing, optical elements, louvres, etc. 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. In yet a further aspect, the invention also provides a projection device comprising the light generating system as defined herein. Especially, a projection 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 projection devicemay include one or more light generating systems such as described herein. Hence, in anaspect the invention also provides a lighting device selected from the group of a lamp, a luminaire, a projector device, a disinfection device, a photochemical reactor, and an optical wireless communication device, comprising the light generating system as defined herein. Especially, in an aspect the invention provides a lighting device selected from the group of a lamp and a luminaire, 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. BRIEF DESCRIPTION OF THE DRAWINGS 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: Fig.1A-B schematically depict an embodiment of the light generating system; Fig.2A-C schematically depict an embodiment of the light generating system comprising a LED filament; Fig.3 schematically depicts an embodiment of the system light; and Fig.4 schematically depicts an embodiment of the lighting device. Fig.5 schematically depicts the excitation and emission spectrum of KSiF phosphor. Fig.6 schematically depicts the excitation and emission spectrum of Oxynitride phosphor. The schematic drawings are not necessarily to scale. DETAILED DESCRIPTION OF THE EMBODIMENTS Fig.1A schematically depicts an embodiment of the light generating system 1000 configured to generate system light 1001. The light generating system 1000 may 2023PF80239 41 comprises N first light generating devices 110 and M second light generating devices 120. In Fig.1A, one first light generating device 110 and one second light generating device 120 are depicted, yet the light generating system 1000 may in embodiments comprise a plurality of (both) first and second light generating systems 110,120. Especially, in embodiments, N / M ≥ 3. Further, the first light generating devices 110 and the second light generating devices 120 may be individually selected from the group of light emitting diodes (LEDs) and chip-on- board devices. Each first light generating device 110 may comprises a first light source 10 and a first luminescent converter 2100. The first light source 10 may especially comprise a solid state light source. Further, the first light source 10 may be configured to generate first light source light 11 having a first light source centroid wavelength ^sc1selected from the range of 430-490 nm. The first luminescent converter 2100 may comprise a first (green- yellow) luminescent material 210 and a second (red) luminescent material 220. The first luminescent material 210 may be configured to convert part of the first light source light 11 into first (green-yellow) luminescent material light 211, having a first luminescent material centroid wavelength ^lc1selected from the range of 510-570 nm. Additionally or alternatively, the second luminescent material 220 may be configured to convert part of the first light source light 11 into second (red) luminescent material light 221 having a second luminescent material centroid wavelength ^lc2 selected from the range of 625-635 nm. In embodiments, at least 90 weight percent (w / w%) of the first (green-yellow) luminescent material 210 may be A3B5O12:Ce3+; wherein A comprises at least one of Y, La, Gd, Tb and Lu; and wherein B comprises at least one of Al, Ga, In and Sc. Further, at least 90 weight percent (w / w%) of the second (red) luminescent material 220 may be M’zM2-2zAX6doped with tetravalent manganese; wherein M’ comprises an alkaline earth cation; wherein M comprises an alkaline cation, and z is in the range from 0 to 1; wherein A comprises a tetravalent cation; and wherein X comprises a monovalent anion, at least comprising fluorine. In embodiments, each first light generating device 110 may be configured to generate first device light 111 having a spectral power distribution in the wavelength range of 380-780 nm with at maximum 30% of the spectral power provided by the first light source light 11 and at least 70% of the spectral power provided by the first luminescent material light 211 and the second luminescent material light 221. Each second light generating device 120 may comprise a second light source 20 and a second luminescent converter 2200. The second light source 20 may especially comprise a solid state light source. In embodiments, the second light source 20 may be configured to generate second light source light 21 having a second light source centroid 2023PF80239 42wavelength ^sc2 selected from the range of 430-490 nm. In specific embodiments, ^sc2 maybe selected from the range of 478-490 nm. Further, the second luminescent converter 2200 may comprise a third (red) luminescent material 230. The third luminescent material 230 may be configured to convert at least part of the second light source light 21 into third (red) luminescent material light 231 having a third luminescent material centroid wavelength ^lc3selected from the range of 600-660 nm. Specifically, in embodiments, the third luminescent material centroid wavelength ^lc3may be selected from the range of 600-625 nm or selected from the range of 635-660 nm. In embodiments, at least 90 weight percent (w / w%) of the third luminescent material 230 may be an oxynitride luminescent material and / or a nitrideluminescent material. Each second light generating device 120 may be configured to generatesecond device light 121 having a spectral power distribution in the wavelength range of 380- 780 nm with at least 70% of the spectral power provided by the third (red) luminescent material light 231 and at maximum 30% of the spectral power provided by the second light source light 21. Further, in a first operational mode of the light generating system 1000 the system light 1001 may comprise at least first device light 111. Additionally or alternatively, in the first operational mode of the light generating system 1000 the system light 1001 may comprise at least second device light 121. Additionally or alternatively, in a first operationalmode of the light generating system 1000, the system light 1001 may be white light having acorrelated color temperature in a range from 2000-6500 K and a color rendering index of at least 80. The light generating system 1000 may further comprise a control system 300, configured to control the N first light generating devices 110 and M second light generating devices 120, such as especially in dependence of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer. Specifically, in a first operational mode of the light generating system 1000, the control system 300 may be configured to maintain the correlated color temperature (of the system light 1001) in a range of 2000-6500 K. Additionally or alternatively, in a first operational mode of the light generating system 1000, the control system 300 may be configured to maintain the color rendering index (of the system light 1001) at at least 80. Fig.1B schematically depicts a further embodiment of the light generating system 1000. As depicted, the first luminescent converter 2100 may be configured at a (non- zero) first distance d1from the first light source 10. Similarly, the second luminescent converter 2200 may be configured at a (non-zero) second distance d2 from the second light source 20. In embodiments, d1 ≠ d2. Yet, in alternative embodiments, d1 = d2. The first light 2023PF80239 43 generating devices 110 may be configured such that the first light source light 11 may (only) irradiate the (respective) first luminescent converter 2100, and may (essentially) not irradiate the second luminescent converter 2200. Hence, in embodiments, the first light generating devices 110 may be configured separated from the second light generating devices 120 (as depicted in Fig.1B). Alternatively, the light generating system may comprise optics, configured to guide the first light source light 11 to the first luminescent converter 2100, and the second light source light 21 to the second luminescent converter 2200. As depicted in Fig. 1B, the first (and / or second) light sources 10(,20) from different first (and / or second) light generating devices 110(,120) may share the same first (and / or second) luminescent converter 2100(,2200). Alternatively, the first (and / or second) light generating device 110(,120) may comprise multiple first (and / or second) light sources 10(,20). Fig.2A schematically depicts an embodiment of the light generating system 1000 comprising a LED filament. In (such) embodiments, (at least part of) the N first light generating devices 110 and M second light generating devices 120 may be mounted on a carrier 5. The light generating devices 110,120 may be mounted on one (as depicted in Fig. 2A) or both sides of the carrier 5. Further, the LED filament may comprise an encapsulant 3100. The encapsulant 3100 may be configured to cover the first light generating devices 110and second light generating devices 120, and may optionally be configured to cover at leastpart of the carrier 5. Further, the encapsulant 3100 may comprise a light scattering material 310, configured to scatter the first device light 111 and second device light 121 to provide diffused system light 1001. The encapsulant 3100 may further be configured to protect the first and second light generating devices 110,120 against ingress (from e.g. water or dirt). Fig.2B schematically depicts a further embodiment of the light generating system 1000 comprising a LED filament. The LED filament may comprise one or more sub- filaments. Here, a sub-filament comprising first light generating devices 110 is depicted. In such embodiments, the first luminescent converter 2100 may be configured as an encapsulant covering the first light sources 10 of the first light generating devices 110. Hence, the LED (sub-)filament may comprise a first encapsulant comprising the first luminescent converter 2100 and a second encapsulant 3100 optionally comprising a light scattering material 310. Fig.2C schematically depicts an embodiment of a light generating system 1000, wherein the first light sources 10 of the first light generating devices 110 are configured on a first major surface of the carrier 5, and the second light sources 20 of thesecond light generating devices 120 are configured on a second major surface of the carrier 5.Further, in the embodiment depicted in Fig.2C, the first luminescent converter(s) 2100 of the 2023PF80239 44 first light generating devices 110 may be configured covering the first major surface of the carrier 5, and the second luminescent converter(s) 2200 of the second light generating devices 120 may be configured covering the second major surface of the carrier 5. In such embodiments, first device light 111 may be provided from a first side of the light generating system 1000, especially of the LED filament, and second device light 121 may be provided from a second side of the light generating system 1000, especially of the LED filament. Fig.3 schematically depicts a CIE 1931 chromaticity diagram indicating the black body locus (BBL) with corresponding correlated color temperatures (CCT). Fig.3 further schematically depicts an embodiment of the system light 1001 generated by the light generating system 1000. In embodiments, in the first operational mode of the light generating system 1000, the system light 1001 may be white light having a CCT in a range from 2000- 6500 K, especially in a range from 2700-4000 K. Further, the system light 1001 maycomprise the first device light 111 and the second device light 121. The first device light maycomprise the first light source light 11, the first luminescent material light 211, and the second luminescent material light 221. As indicated above, the first light source light 11 (and / or the second light source light 21) may have a first light source centroid wavelength λsc1 (and / or a second light source centroid wavelength λsc2) selected from the range of 430- 490 nm. Further, in embodiments, one may apply of |^sc1-^sc2| ≤ 10 nm and |^sc1-^sc2| ≥ 30 nm. The first luminescent material light 211 may be green-yellow light having a first luminescent material centroid wavelength λlc1 selected from the range of 510-570 nm, and the second luminescent material 221 may be red light having a second luminescent material centroid wavelength λlc2 selected from the range of 625-635 nm. Depending on the ratio of first light source light 11, first luminescent material light 211, and second luminescent material light 221 in the first device light 111, the first device light 111 may be white light or colored light. Especially, in the first operational mode of the light generating system 1000, the first device light 111 may (be white light, wherein the white first device light 111 may) have a color point above the black body locus with a distance to the BBL or at least 10SDCM. In Fig. 3, the color points for first device light 111 (in the first operational mode)having three different ratios of first light source light 11, first luminescent material light 211, and second luminescent material light 221 are indicated with references 111a, 111b, and 111c. As depicted, the color point for each first device light 111a,111b,111c lies above the BBL. Fig.3 further depicts two color points for second device light 121 having a different ratio of second light source light 21 and third luminescent material light 231, as indicated by 2023PF80239 45 references 121a and 121b. In embodiments, one (or more) of the first device light 111 and second device light 121 may be colored light. 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 300 comprised by or functionally coupled to 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 or projector system, which may be used to project images, such as at a wall, which may also comprise 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 projector device 3, a disinfection device, a photochemical reactor, and an optical wireless communication device, comprising the light generating system 1000 as described herein. Especially, Fig.4 schematically depicts embodiments of a lighting device 1200 selected from the group of a lamp 1 and a luminaire 2, comprising the light generating system 1000 as described herein. In embodiments, such lighting device may be a lamp 1, a luminaire 2, a projector device 3, a disinfection device, or an optical wireless communication device. Lighting device light escaping from the lighting device 1200 is indicated with reference 1201. Lighting device light 1201 may essentially consist of system light 1001, and may in specific embodiments thus 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. Fig.5 schematically depicts the excitation and emission spectrum of KSiF phosphor. Fig.6 schematically depicts the excitation and emission spectrum of Oxynitride phosphor. The term “plurality” refers to two or more. The terms “substantially” or “essentially” herein, 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 or more of the items mentioned before and after “and / or”. For 2023PF80239 46 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. 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. 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. 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. In yet a further aspect, the invention (thus) provides a software product, which, when running on a computer is capable of bringing about (one or more embodiments of) the method as described herein. 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 2023PF80239 47 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 the 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. 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

2023PF80239 48 CLAIMS:

1. A light generating system (1000) configured to generate system light (1001),wherein the light generating system (1000) comprises N first light generating devices (110) and M second light generating devices (120), wherein:- each first light generating device (110) comprises a first light source (10) and afirst luminescent converter (2100);- the first light source (10) comprises a solid state light source, wherein the firstlight source (10) is configured to generate first light source light (11) having a first light source centroid wavelength (^sc1) selected from the range of 430-490 nm;- the first luminescent converter (2100) comprises a first luminescent material(210) and a second luminescent material (220); the first luminescent material (210) is configured to convert part of the first light source light (11) into first luminescent material light (211), having a first luminescent material centroid wavelength (^lc1) selected from the range of 510-570 nm; the second luminescent material (220) is configured to convert part of the first light source light (11) into second luminescent material light (221) having a second luminescent material centroid wavelength (^lc2) selected from the range of 625-635 nm;- wherein at least 90 weight percent (w / w%) of the first luminescent material(210) is A3B5O12:Ce3+; wherein A comprises at least one of Y, La, Gd, Tb and Lu; and wherein B comprises at least one of Al, Ga, In and Sc; wherein at least 90 weight percent (w / w%) of the second luminescent material (220) is M’zM2-2zAX6 doped with tetravalent manganese; wherein M’ comprises an alkaline earth cation; wherein M comprises an alkaline cation, and z is in the range from 0 to 1; wherein A comprises a tetravalent cation; and wherein X comprises a monovalent anion, at least comprising fluorine;- each first light generating device (110) is configured to generate first devicelight (111) having a spectral power distribution in the wavelength range of 380-780 nm withat maximum 30% of the spectral power provided by the first light source light (11) and atleast 70% of the spectral power provided by the first luminescent material light (211) and the second luminescent material light (221);- each second light generating device (120) comprises a second light source (20)and a second luminescent converter (2200);2023PF80239 49- the second light source (20) comprises a solid state light source, wherein thesecond light source (20) is configured to generate second light source light (21) having a second light source centroid wavelength (^sc2) selected from the range of 430-490 nm;- the second luminescent converter (2200) comprises a third luminescentmaterial (230); the third luminescent material (230) is configured to convert at least part of the second light source light (21) into third luminescent material light (231) having a third luminescent material centroid wavelength (^lc3) selected from the range of 600-660 nm;- at least 90 weight percent (w / w%) of the third luminescent material (230) is anoxynitride luminescent material and / or a nitride luminescent material;- each second light generating device (120) is configured to generate seconddevice light (121) having a spectral power distribution in the wavelength range of 380-780 nm with at least 70% of the spectral power provided by the third luminescent material light (231) and at maximum 30% of the spectral power provided by the second light source light (21); and- in a first operational mode of the light generating system (1000), (a) thesystem light (1001) comprises at least first device light (111) and second device light (121), and (b) the system light (1001) is white light having a correlated color temperature in a range from 2000-6500 K and a color rendering index of at least 80; and- wherein a first luminescent converter content of the first luminescent converter(2100) consists for at least 90 weight percent (w / w%) of the first luminescent material (210) and the second luminescent material (220).

2. The light generating system (1000) according to claim 1, further comprising acontrol system (300), configured to control the N first light generating devices (110) and M second light generating devices (120) in dependence of one or more of an input signal of a user interface, a sensor signal, and a timer; wherein in a first operational mode of the light generating system (1000) the control system (300) is configured to one or more of: (a) maintain the correlated color temperature in a range of 2000-6500 K, and (b) maintain the color rendering index at at least 80.

3. The light generating system (1000) according to claim 2, wherein the controlsystem (300) is configured to determine a relative contribution of the first luminescent material light (211) to the system light (1001); wherein the control system (300) is configuredto (i) maintain a color point (x,y) of the system light (1001) within 7 SDCM and / or (ii)2023PF80239 50 maintain the correlated color temperature of the system light (1001) within 300 K bycontrolling and varying the amount of the second device light (121) generated by the secondlight generating device (120).

4. The light generating system (1000) according to any one of the precedingclaims, wherein one or more of the following applies: (a) in the first luminescent material (210) A consists for at least 90 atom% of Y and / or Lu and B consists for at least 90 atom% of Al, and (b) in the second luminescent material (220) z=0, M consists for at least 90 atom% of K and / or Rb, A consists for at least 90 atom% of Si and / or Ti, and X consists for at least 90 atom% of F.

5. The light generating system (1000) according to any one of the precedingclaims, wherein a second luminescent converter content of the second luminescent converter (2200) consists for at least 90 weight percent (w / w%) of the third luminescent material (230).

6. The light generating system (1000) according to any one of the precedingclaims, wherein the third luminescent material (230) comprises one or more of: (i) (Ba,Sr,Ca)AlSiN3:Eu, (ii) (Ba,Sr,Ca)2Si5N8:Eu, (iii) Si6–zAlzOzN8–z:Pr, wherein 0 ≤ z ≤ 2.0, and (iv) (Sr1-xEux)αSiβAlγOδNω, wherein 0 < x <1, 0 < α ≤ 3, 5 ≤ β ≤ 7, 3 ≤ γ ≤ 5, 0.5 ≤ δ ≤ 0.8, and 5 ≤ ω ≤ 15.

7. The light generating system (1000) according to any one of the precedingclaims, wherein the overlap between the excitation spectrum of the second luminescent material and the emission spectrum of the first luminescent material is at most 5% of the emission spectrum of the first luminescent material.

8. The light generating system (1000) according to any one of the precedingclaims, wherein |^sc1-^sc2| ≤ 10 nm.

9. The light generating system (1000) according to any one of the precedingclaims 1-7, wherein |^sc1-^sc2| ≥ 30 nm.

10. The light generating system (1000) according to any one of the precedingclaims, wherein ^sc2 is selected from the range of 478-490 nm.2023PF80239 5111. The light generating system (1000) according to any one of the precedingclaims, wherein in the first operational mode of the light generating system (1000) the first device light (111) has a color point above the black body locus with a distance to the BBL ofat least 10 SDCM; wherein second device light has a color point below the black body locuswith a distance to the BBL of at least 10 SDCM; wherein admixing the first device light andthe second device light in the system light results in system light having a color point locatedcloser to the BBL than the color points of the first device light and the second device light.

12. The light generating system (1000) according to any one of the precedingclaims, wherein one of the following applies: (a) the first light generating device (110) is configured to generate first device light (111) having a spectral power distribution in the wavelength range of 380-780 nm with at most 2% of the spectral power provided by the first light source light (11), and (b) the second light generating device (120) is configured to generate second device light (121) having a spectral power distribution in the wavelength range of 380-780 nm with at most 2% of the spectral power provided by the second light source light (21).

13. The light generating system (1000) according to any one of the precedingclaims, wherein the third luminescent material centroid wavelength (^lc3) is selected from the range of 600-625 nm or selected from the range of 635-660 nm.

14. The light generating system (1000) according to any one of the precedingclaims, wherein N / M ≥ 3.

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

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