Laser-phosphor engine with multiple blue sources and fractional use for diffused blue

Abstract

The invention provides a light generating system (1000) comprising light generating devices (110,120,130), a luminescent material (200), a control system (300), optics (500), a polarization control system (600), a diffuser system (1710), and a light exit (1090); wherein: (I) each of the light generating devices (110,120,130) comprise a solid-state light source (10,20,30); the luminescent material (200) is configured to convert at least part of the device light received by the luminescent material (200) into luminescent material light (201): the diffuser system (1710) is configured to diffuse at least part of the device light received by the diffuser system (1710) into diffused device light (711); (II) the optics (500) comprise redirection optics (510); wherein the redirection optics (510) comprise polarization based redirection optics (PPBS1,PBS2) and dichroic based redirection optics (DBS1,DBS2); (III) a first dichroic redirection optics (DBS1) is configured to combine first device light (111) and second device light (121) received by the first dichroic redirection optics (DBS1); the polarization control system (600) is configured to control a polarization of device light propagating from the first dichroic redirection optics (DBS1) to the first polarization redirection optics (PPBS1) via the polarization control system (600); the first polarization redirection optics (PPBS1) is configured to direct device light received from the first dichroic redirection optics (DBS1), in dependence of its polarization, to one or more of (a) the luminescent material (200) via second dichroic redirection optics (DBS2) and (b) the diffuser system (1710) via second polarization redirection optics (PBS2); the second dichroic redirection optics (DBS2) is configured to direct device light received from the first polarization redirection optics (PPBS1) to the luminescent material (200) and to direct the luminescent material light (201) to the light exit (1090); the second polarization redirection optics (PBS2) is configured to direct the device light received from the first polarization redirection optics (PPBS1) to the diffuser system (1710) and to direct diffused device light (711) to the light exit (1090); and (IV) the control system (300) is configured to control a spectral power distribution of system light (1001) of the light generating system (1000).

Description

[0001]2023PF80451 1 Laser-phosphor engine with multiple blue sources and fractional use for diffused blue 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 Laser-phosphor based lighting fixtures are known in the art. For instance, WO2022143318 describes a light emitting device, comprising a first light source, a second light source, a dichroic mirror, a wavelength conversion apparatus, a first light path adjusting apparatus or a second light path adjusting apparatus, and a first scattering optical system. The light mixing effect of emergent light can be improved by using the first scattering optical system. Light emitted by the first light source is all used for exciting the wavelength conversion apparatus. SUMMARY OF THE INVENTION High brightness light sources can be used in various applications including spots, stage-lighting, headlamps, home and office lighting, and automotive lighting. For this purpose, laser-phosphor technology can be used, wherein a laser provides laser light and a remote phosphor converts laser light into converted light. A relatively straightforward way to produce white light using lasers is to use (blue) laser light in combination with a (yellow) phosphor to generate phosphor converted light. Laser-phosphor systems may allow generation of high brightness light and may therefore be used in projection systems, including displays such as cinema projectors and projectors for home, school, and office applications, car front lighting, search lighting, stage lighting, architectural lighting, and special lighting applications. In general, a laser-phosphor light engine may be capable to generate only a single color point as defined by the luminescent converter. Creation of a product range providing different color points may be costly as it requires multiple unique components to be designed, qualified, produced, and kept in stock. In other cases, e.g. in RGB LCD-based projection systems, the maximum brightness is limited by the components used, the engine volume is large due to the many components, and the system cost are high 2023PF80451 2 due to the many dedicated components. A way to combine pump light and luminescent light may be to use a polarizing beam splitter for the pump light, by which part of the light is reflected to the luminescent material and part is transmitted to a diffuser. However, in general the diffused light may to a large degree be depolarized, which may result in relatively high losses of diffused blue light at a beam combiner where it is combined with the luminescent light into white output light. In many laser-based light engine designs the effective usage of the laser light sources, in case there may be more than one source, may depend on the light source design (what may be the maximum output of the sources used) versus the targeted output white light color point. There appears to be a need for architectures that enable optimal (=full) use of the laser light sources used for any of a range of selectable output white light color points, as the choice in output powers may be very limited and installation of redundant laser diodes may be very expensive. An option could be a system comprising a first laser source fully used for light conversion and a second laser source that may be partly used for luminescent conversion and partly used to contribute as blue light to the output white light. However, entertainment lighting may be requesting higher light output values than what can be realized with the highest power laser banks that are available on the market. Therefore, there may be a need for tunable laser-phosphor light engines that may use the full power of more than two laser banks while not increasing the light source etendue. Another option could be an architecture, wherein the range of blue light that can be used for diffusion may be fixed from zero to the maximum output of a single laser bank. However, it may be desired to adjust the amount of blue flux in the output light (for a targeted correlated color temperature (CCT) range), while simultaneously maintaining operation at full power, e.g., in the context of stage lighting. 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. 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 (“system”) comprising light generating devices, a luminescent material, a control system, optics, a polarization control system, a diffuser system, and a light exit. Especially, each of the light generating devices may comprise a solid-state light source selected from the group of diode lasers, superluminescent diodes, and multi-junction diodes. In embodiments, (i) a first light generating device is configured to provide first device light having a first centroid 2023PF80451 3 wavelength (λc1), (ii) a second light generating device is configured to provide second device light having a second centroid wavelength (λc2), and (iii) a third light generating device is configured to provide third device light having a third centroid wavelength (λc3). In specific embodiments, λc2≠λc1, such as in more specific embodiments |λc2-λc1| ≥ 5 nm. Further, the luminescent material may be configured to convert at least part of the device light received by the luminescent material into luminescent material light. Further, in embodiments the diffuser system may comprise an arrangement of a polarization converter and a diffuser. In specific embodiments, the diffuser system may be configured to diffuse at least part of the device light received by the diffuser system into diffused device light (comprising a linear polarization different from the linear polarization of the third device light received by the diffuser system). Further, the optics may comprise redirection optics. In specific embodiments, the redirection optics may comprise one or more of polarization based redirection optics and dichroic based redirection optics. In embodiments, a first dichroic redirection optics may be configured to combine first device light and second device light received by the first dichroic redirection optics. Further, in specific embodiments the polarization control system may be configured to control a polarization of device light propagating from the first dichroic redirection optics to the first polarization redirection optics via the polarization control system. In specific embodiments, the first device light and the second device light reaching the first polarization redirection optics may comprise linear polarized light having the same linear polarizations. Further, in specific embodiments the third device light reaching the first polarization redirection optics may (also) comprise linear polarized light. Further, in specific embodiments the first polarization redirection optics may (i) at least partly reflective for s-polarized device light, and (ii) at least partly reflective and at least partly transmissive for p-polarized device light. In embodiments, the first polarization redirection optics may be configured to direct device light received from the first dichroic redirection optics, in dependence of its polarization, to one or more of (a) the luminescent material via second dichroic redirection optics and (b) the diffuser system via second polarization redirection optics. Yet, in specific embodiments the second dichroic redirection optics may be configured to direct device light received from the first polarization redirection optics to the luminescent material and to direct luminescent material light (from the luminescent material) to the light exit. Especially, the second polarization redirection optics may be configured to direct device light received from the first polarization redirection optics to the diffuser system and to direct diffused device light (from the diffuser system) to the light exit. Especially, the light generating system may be configured to generate system light. 2023PF80451 4 In specific embodiments, in an operational mode of the light generating system the system light may be white light comprising at least part of the luminescent material light and at least part of the diffused device light. Further, in embodiments the control system may be configured to control a spectral power distribution of the system light. Hence, in specific embodiments the invention provides a light generating system comprising light generating devices, a luminescent material, a control system, optics, a polarization control system, a diffuser system, and a light exit; wherein: (I) each of the light generating devices comprise a solid-state light source; the luminescent material is configured to convert at least part of the device light received by the luminescent material into luminescent material light: the diffuser system configured to diffuse at least part of the device light received by the diffuser system into diffused device light; (II) the optics comprise redirection optics; wherein the redirection optics comprise polarization based redirection optics and dichroic based redirection optics; (III) a first dichroic redirection optics is configured to combine first device light and second device light received by the first dichroic redirection optics; the polarization control system is configured to control a polarization of device light propagating from the first dichroic redirection optics to the first polarization redirection optics via the polarization control system; the first polarization redirection optics is configured to direct device light received from the first dichroic redirection optics, in dependence of its polarization, to one or more of (a) the luminescent material via second dichroic redirection optics and (b) the diffuser system via second polarization redirection optics; the second dichroic redirection optics is configured to direct device light received from the first polarization redirection optics to the luminescent material and to direct luminescent material light to the light exit; the second polarization redirection optics is configured to direct device light received from the first polarization redirection optics to the diffuser system and to direct diffused device light to the light exit; and (IV) the control system is configured to control a spectral power distribution of system light of the light generating system. Yet, in specific embodiments the invention provides a light generating system comprising light generating devices, a luminescent material, a control system, optics, a polarization control system, a diffuser system, and a light exit; wherein: (A) each of the light generating devices comprise a solid-state light source selected from the group of diode lasers, superluminescent diodes, and multi-junction diodes; wherein (i) a first light generating device is configured to provide first device light having a first centroid wavelength (λc1), (ii) a second light generating device is configured to provide second device light having a second centroid wavelength (λc2), and (iii) a third light generating device is configured to provide third device light having a third centroid wavelength (λc3); wherein 2023PF80451 5 λc2≠λc1; (B) the luminescent material is configured to convert at least part of the device light received by the luminescent material into luminescent material light: (C) the diffuser system comprises an arrangement of a polarization converter and a diffuser; wherein the diffuser system is configured to diffuse at least part of the device light received by the diffuser system into diffused device light; (D) the optics comprise redirection optics; wherein the redirection optics comprise polarization based redirection optics and dichroic based redirection optics; (E) a first dichroic redirection optics is configured to combine first device light and second device light received by the first dichroic redirection optics; (F) the polarization control system is configured to control a polarization of device light propagating from the first dichroic redirection optics to the first polarization redirection optics via the polarization control system; (G) the first device light and the second device light reaching the first polarization redirection optics comprise linear polarized light; wherein the third device light reaching the first polarization redirection optics comprises linear polarized light; (H) the first polarization redirection optics is (i) at least partly reflective for s-polarized device light, and (ii) at least partly reflective and at least partly transmissive for p-polarized device light; the first polarization redirection optics is configured to direct device light received from the first dichroic redirection optics, in dependence of its polarization, to one or more of (a) the luminescent material via second dichroic redirection optics and (b) the diffuser system via second polarization redirection optics; (I) the second dichroic redirection optics is configured to direct device light received from the first polarization redirection optics to the luminescent material and to direct the luminescent material light to the light exit; (J) the second polarization redirection optics is configured to direct device light received from the first polarization redirection optics to the diffuser system and to direct the diffused device light to the light exit; (K) the light generating system is configured to generate system light; wherein in an operational mode of the light generating system the system light is white light comprising at least part of the luminescent material light and at least part of the diffused device light; and (L) the control system is configured to control a spectral power distribution of the system light. With such light generating system(s), the device light of more than two light generating devices can be used for conversion to luminescent material light, which luminescent material light can be combined with diffuse device light to provide high intensity white light through a system opening, while maintaining a relatively low etendue. Further, the light generating system may facilitate controlling the proportion of the device light that is converted to luminescent material light without adjusting the amount of generated (and used) 2023PF80451 6 device light. In particular, the polarization control system may be configured to adjust the polarization of device light of one or more of the light generating devices and may, thereby, control the proportions of transmitted and reflected device light by downstream redirection optics, specifically by downstream polarization based redirection optics, thereby controlling the proportions of device light provided to the luminescent material and to the diffuser system. The invention may thus provide light engine architectures that can be operated with three (independent) laser banks that can be operated at constant, optimal (e.g., most efficient), and / or maximum drive currents, while using the same etendue as that of a single laser bank and while providing a tunable CCT, that can be easily factory-calibrated or use- case adjusted with respect to the requested color point for any of the color points selected in a predetermined range of white light output color points (e.g.6500 – 10000 K), with a relatively high accuracy of the calibration and / or use-case adjustment of the color temperature. Yet further, with such a system the color point may easily be adjusted by the user, for any of the color points selected in a predetermined range of white light output color points (e.g.6000 – 10000 K), while providing highly efficient collection of all the spectral contributions to the output light, resulting in a relatively high efficiency high brightness and high flux (>40 klm) white light engine. Hence, the invention may provide a constant power tunable CCT laser-phosphor source comprising three laser banks. The light generating system (or “system”) may thus comprise light generating devices, a luminescent material, a control system, optics, a polarization control system, a diffuser system, and a light exit. The light generating system may especially apply three (or more) light generating devices that may each be operated at a constant power while the system may be set to any correlated color temperature (CCT) in a predetermined range of CCTs. Here below, embodiments of the different components of the light generating system will be described in further detail. The light generating devices may be configured to generate device light. Therefore, in embodiments, the light generating devices may each comprise a solid-state light source. In embodiments, the light generating devices may comprise (at least) a first light generating device, a second light generating device, and a third light generating device. The first light generating device may, in embodiments, be configured to generate first device light. Therefore, in embodiments, the first light generating device may comprise a first light source. The first light source may be essentially any light source, see also further below. Especially, in embodiments, the (first light source of the) first light generating device may 2023PF80451 7 comprise a first solid state light source. Hence, in embodiments, the first light generating device may comprise one or more of a laser diode, a superluminescent diode, and a stacked multi-junction light-emitting diode (LED). The first light generating device may herein also comprise a plurality of first (solid state) light sources. Especially, in specific embodiments, the first light generating device may comprise a first laser bank comprising a plurality of first lasers. A laser bank may comprise a relatively dense assembly of multiple laser diodes on a shared substrate provided with collimating optics, such as collimating lenses comprising one lens per laser diode (e.g. arranged in an array of lenses, see also further below). The use of laser banks may especially be convenient for projecting a beam of high power laser light onto a luminescent converter without the need for using an inverse beam expander. In embodiments, the first light generating device, the second light generating device, and the third light generating device may be configured to provide first device light, second device light, and third device light, respectively, to the optics. Further, in embodiments, the first light generating device may especially be configured to generate first device light having a first centroid wavelength (λc1). Especially, in embodiments, the first device light may have a first centroid wavelength (λc1) selected from the wavelength range of 400-500 nm, especially from the range of 430-500 nm, such as from the range of 440-490 nm, like from the range of 445-480 nm. In further embodiments, the first device light may have a first centroid wavelength (λc1) selected from the wavelength range of 400-500 nm, such as from the range of 400-490 nm, especially from the range of 430-490 nm. Hence, in embodiments, the first device light may be blue light. The term “centroid wavelength”, also indicated as λc, e.g., as λc1for the centroid wavelength of the first device light, is known in the art, and refers to the wavelength value where half of the light energy is at shorter and half the energy 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. Analogously to the first light generating device, the second light generating device may be configured to generate second device light. Therefore, in embodiments, the second light generating device may comprise a second light source. The second light source may be essentially any light source, see also further below. Especially, in embodiments, the 2023PF80451 8 (second light source of the) second light generating device may comprise a second solid state light source. Hence, in embodiments, the second light generating device may comprise one or more of a laser diode, a superluminescent diode, and a stacked multi-junction light-emitting diode (LED). The second light generating device may herein also comprise a plurality of second (solid state) light sources. Especially, in specific embodiments, the second light generating device may comprise a second laser bank comprising a plurality of second lasers. In embodiments, the second light generating device may be configured to generate second device light having a second centroid wavelength (λc2). In particular, the second device light may have a second centroid wavelength (λc2) selected from the wavelength range of 430-500 nm, such as from the range of 440-490 nm, like from the range of 445-480 nm. In further embodiments, the second device light may have a second centroid wavelength (λc2) selected from the wavelength range of 400-500 nm, such as from the range of 400-490 nm, especially from the range of 430-490 nm. Hence, in embodiments, the second device light may be blue light. Device light from the first and second light generating devices may especially be combined via redirection optics, especially via dichroic based redirection optics, such as via a dichroic beam splitter (DSB1; see below). Hence, the device light from the first and second light generating devices may differ in centroid wavelength. In embodiments, the first centroid wavelength (λc1) and the second centroid wavelength (λc2) may differ. Especially |λc1-λc2| ≥ 1 nm, such as |λc1-λc2| ≥ 2 nm, like |λc1-λc2| ≥ 5 nm, especially |λc1-λc2| ≥ 10 nm. Further, in embodiments, |λc1-λc2| ≤ 30 nm, such as |λc1-λc2| ≤ 25 nm, like |λc1-λc2| ≤ 20 nm. In further embodiments, |λc1-λc2| ≤ 10 nm, such as |λc1-λc2| ≤ 5 nm (but especially |λc1-λc2| ≥ 1 nm). In further embodiments, 5 nm ≤ |λc1-λc2| ≤ 60 nm, especially wherein 10 nm ≤ |λc1-λc2| ≤ 50 nm, such as wherein 15 nm ≤ |λc1-λc2| ≤ 30 nm. In particular, the difference between the first centroid wavelength λc1and λc2may be selected to be large enough to facilitate efficient combining via dichroic based redirection optics, while being small enough for both centroid wavelengths to be suitable for conversion to luminescent material light via a luminescent material (see below). Furthermore, the third light generating device may be configured to generate third device light. Therefore, in embodiments, the third light generating device may comprise a third light source. The third light source may be essentially any light source, see also further below. Especially, in embodiments, the (third light source of the) third light generating device may comprise a third solid state light source. Hence, in embodiments, the third light generating device may comprise one or more of a laser diode, a superluminescent diode, and 2023PF80451 9 a stacked multi-junction light-emitting diode (LED). The third light generating device may herein also comprise a plurality of third (solid state) light sources. Especially, in specific embodiments, the third light generating device may comprise a third laser bank comprising a plurality of third lasers. Further, in embodiments, the third light generating device may especially be configured to generate third device light having a third centroid wavelength (λc3). Especially, in embodiments, the third device light may have a third centroid wavelength (λc3) selected from the wavelength range of 430-500 nm, such as from the range of 440-490 nm, like from the range of 445-480 nm. In further embodiments, the third device light may have a third centroid wavelength (λc3) selected from the wavelength range of 400-500 nm, such as from the range of 400-490 nm, especially from the range of 430-490 nm. Hence, in embodiments, the third device light may be blue light. The third centroid wavelength (λc3) may especially be selected from the range of the first centroid wavelength (λc1) to the second centroid wavelength (λc2), i.e., λc3may be selected from the range of λc1– λc2.For instance, in embodiments, λc1=λc3. In further embodiments, λc2=λc3. In particular, in embodiments, λc1≤ λc3≤ λc2or λc2≤ λc3≤ λc1applies (though still |λc1-λc2| ≥ 1 nm, more especially |λc1-λc2| ≥ 5 nm, may apply). Having λc3in the range of λc1and λc2may be particularly convenient in view of compatibility with optical components, which may further beneficially impact system efficiency. In particular, spectral requirements of optical components (beam splitters / combiners) may be relaxed, while more blue power in a limited spectral range can be applied, which may further allow staying in a range of high excitation of the phosphor. As mentioned above, the first device light, the second device light and the third device light may, in embodiments, all be blue light. In embodiments, the first centroid wavelength (λc1), the second centroid wavelength (λc2), and the third centroid wavelength (λc3) may (each) be individually selected from the wavelength range of 400-500 nm, such as from the range of 400-490 nm, especially from the range of 440-490 nm, such as from the range of 430-490 nm, especially from the range of 445-470 nm. In further embodiments, within the indicated range, λc1and λc2may differ, e.g., by at least 5 nm, and λc3may in embodiments be selected from the range of λc1– λc2. During use, at least part of the device light (i.e., at least part of one or more of the first device light, the second device light and the third device light) may, especially via first polarization redirection optics (see below), be provided to a luminescent material. The light generating system may thus comprise a luminescent material, especially a luminescent element comprising a luminescent material. The luminescent 2023PF80451 10 material may be configured to convert light received by the luminescent material into luminescent material light. Especially, in embodiments, the luminescent element may comprise a first luminescent material configured to convert light received by the first luminescent material into first luminescent material light. The luminescent material may be configured to convert at least part of first radiation (selected from one or more of UV radiation and visible radiation), into luminescent material light. Especially, in embodiments, the luminescent material may be configured to convert at least part of blue light (as radiation) into luminescent material light. Especially when blue light is partly converted, the blue device light may be used as source of blue light (for the system light) and as excitation light that can be converted by the luminescent material. The first radiation may especially be provided by a (solid state) light source. Hence, in embodiments, the luminescent material may be configured to convert at least part of (combined) device light received by the luminescent material into luminescent material light. Especially, in embodiments, the luminescent material may be configured to convert at least 50%, such as at least 60%, like at least 70% of the (combined) device light received by the luminescent material (arrangement) into luminescent material light. Especially, in embodiments, the luminescent material may be configured to convert at least 80%, more especially at least 90%, including 100% of the (combined) device light received by the luminescent material (arrangement) into luminescent material light. The phrase “... light received by ...”, and similar phrases, such as “device light received by the luminescent material” (or “… by the first polarizing beam splitter”) may especially indicate that when the light is actually received by the element, the deice light may have a certain status and / or an action may take place. The action may in embodiments be one or more of conversion, reflection, and transmission. Further, the action may also include refraction. Whether or not such element receives light may e.g. depend on e.g. a controlling mode (for instance whether or not a light generating device provides light). The status may e.g. be a certain (linear) polarization. The luminescent material may be configured to convert at least part of the device light received by the luminescent material into luminescent material light. Herein, the term “device light” may refer to device light from one or more of the light generating devices (such as from one or more of the first light generating device, the second light generating device, and the third light generating device) that may reach the luminescent material via the optics. Especially, during operation the luminescent material may be irradiated by (i) one or more first device light and second device light, that may reach the luminescent material via 2023PF80451 11 the first dichroic redirection optics (DBS1) and the polarization based redirection optics (PPBS1), and optionally other optics, (ii) and / or third device light, that may reach the luminescent material via the polarization based redirection optics (PPBS1), and optionally other optics. When different luminescent materials are applied, one or more luminescent materials may be configured to convert incident light into one or more of green and yellow luminescent material light, and one or more other luminescent materials may be configured to convert incident light into one or more of orange and red luminescent material light. The term “luminescent material” especially refers to a material that can convert first radiation, especially one or more of UV radiation and blue radiation, into second radiation. In general, the first radiation and the second radiation have different spectral power distributions. Hence, instead of the term “luminescent material”, also the terms “luminescent converter” or “converter” may be applied. Further, 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 general, the second radiation has a spectral power distribution at larger wavelengths than the first radiation, which is the case in the so-called down-conversion. In specific embodiments, however the second radiation has a spectral power distribution with intensity at smaller wavelengths than the first radiation, which is the case in the so-called up- 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 (other) visible light. The luminescent material may in specific embodiments also convert radiation into infrared radiation (IR). Hence, upon excitation with radiation, the luminescent material emits radiation. The term “luminescence” may herein also refer to phosphorescence and / or fluorescence. Instead of the term “luminescence”, also the term “emission” may be applied. Hence, the terms “first radiation” and “second radiation” may refer to excitation radiation and emission (radiation), respectively. In embodiments, the term “luminescent material” may herein also refer to a phosphorescent material and / or to a fluorescent material. The term “luminescent material” may also refer to a plurality of different luminescent materials. Hence, the term “luminescent material” may in specific embodiments also refer to a luminescent material composition. The term “luminescent material” herein may also refer to a material comprising a luminescent material, such as a light transmissive host comprising the luminescent material. Examples of possible luminescent materials are indicated further below. 2023PF80451 12 In embodiments, the light generating system may further comprise a diffuser system. The diffuser system may especially comprise a polarization converter and a diffuser. The term ‘polarization converter’ may herein refer to an (optical) element configured to change the polarization state of light traveling therethrough. The polarization converter may, in embodiments, comprise a birefringent rotator, more especially a λ / 4 waveplate (or: “quarter wave plate”; QWP), a Faraday rotator, a metasurface or metamaterial based polarization rotator, or a Fresnel Rhomb retarder. As known from the art, a waveplate or retarder is an optical device that alters the polarization state of a light wave travelling through it. A halfwave plate may shift the polarization direction of linearly polarized light (especially from s to p or from p to s polarization), and a quarter-wave plate may convert linearly polarized light into elliptically (such as especially circularly) polarized light (and vice versa). The Fresnel Rhomb retarder may beneficially be (essentially) wavelength- independent, but may require more space than a QWP or a metasurface retarder. The polarization converter, especially the λ / 4 waveplate, may especially be configured between (relative to the propagation of light through the system) the second polarization redirection optics (see below) and the diffuser. Further, in embodiments, the polarization converter, especially the λ / 4 waveplate, may be configured between (relative to the propagation of light through the system) the diffuser and the light exit. The polarization converter may thus be arranged both upstream and downstream of the diffuser. The diffuser may, in embodiments, be configured to diffuse at least part of the device light received by the diffuser system into diffused device light. Especially, in embodiments, the diffuser may be configured to diffuse at least 30%, like at least 50%, such as at least 60%, like at least 70% of the device light, received by the diffuser system, especially by the diffuser, into diffused device light. Especially, in embodiments, the diffuser may be configured to diffuse at least 80%, more especially at least 90%, including 100% of the device light received by the diffuser system, especially by the diffuser, into diffused device light. In embodiments, the diffuser may especially comprise a substantially polarization maintaining diffuser, i.e., the diffuser may be configured to substantially maintain the polarization of the incident light upon diffusion (and in some embodiments reflection)(even though the handedness may (thus) change). Such embodiments may be beneficial as depolarization at the diffuser may be reduced, therewith improving the efficiency of the contribution of the diffuser arrangement to the system light. For instance, in embodiments, the diffuser may comprise a metal coated surface textured glass substrate mounted on a heat conductive material such as e.g. a metal or a ceramic. In such 2023PF80451 13 embodiments, the heat conductive material may be configured to conduct away heat that may be generated in the diffuser due to some absorption of incident device light. In embodiments, the diffuser system may comprise a (surface) diffuser. Especially, in embodiments, the diffuser may comprise an element comprising a light- diffusive material, such as e.g. a silica, ground glass, a polymeric material, a ceramic material, a metal(lic) material, a white material, and a rough-surfaced material. Further, in embodiments, the diffuser may comprise a diffractive optical element, such as e.g. a diffractive diffuser, or a holographic optical element, such as e.g. metasurfaces comprising multiple different sub-wavelength features at the surface of a substrate such as fused silica. The diffuser system may thus comprise a polarization converter and a diffuser, wherein the diffuser system is configured such that linearly polarized device light received by the diffuser system undergoes the following modifications: (1) the device light passes through the polarization converter and gets converted to (first) elliptically polarized device light, (2) the (first) elliptically polarized device light arrives at the diffuser and gets diffused into elliptically polarized diffused device light, (3) the elliptically polarized diffused device light passes through the polarization converter and gets converted to (linearly polarized) diffused device light, especially wherein the device light and the diffused device light have opposite polarizations. For instance, the device light may be p-polarized and the diffused device light may be s-polarized. The polarization converter, especially the λ / 4 waveplate, may, in embodiments, thus be configured to convert device light received by the λ / 4 waveplate having a linear polarization into device light having a (first) elliptical polarization, especially a (first) circular polarization. At the diffuser, in embodiments, the device light having the (first) circular polarization may be diffused into diffused device light having a (second) elliptical polarization, especially a second circular polarization. Therefore, in embodiments, the λ / 4 waveplate may also be configured to convert diffused device light received by the λ / 4 waveplate (via the diffuser) and having the (second) elliptical polarization, especially the (second) circular polarization, into diffused device light having a linear polarization. Hence, the diffuser system may comprise an arrangement of a polarization converter and a diffuser; wherein the diffuser system is configured to diffuse at least part of the device light received by the diffuser system into diffused device light, wherein the diffuse device light has a linear polarization different from the linear polarization of the device light received by the diffuser system. The term “linear polarized light” (or “linearly polarized light”) may herein refer to light having oscillations predominantly aligned in a single plane. Hence, it is not 2023PF80451 14 excluded that some oscillations occur outside of the single plane, such as in a plane perpendicular thereto. For instance, in embodiments, the linear polarized light may have at least 80% of oscillations in a single plane, such as at least 90%, especially at least 95%, such as at least 99%, including 100%. The linearly polarized light may, in embodiments, also comprise elliptically polarized light with a large ratio of perpendicular polarization components, such as a ratio ≥ 4, especially ≥ 6, such as ≥ 10, especially ≥ 20. Linear polarized light may be generated by the shape of the cavity (i.e., the laser resonator) of a laser light source. Generally, lasers may emit with a single polarization as a certain mode is amplified until it dominates. Linear polarized light may also be generated using optical elements of solid state lasers, e.g., polarizing filters and / or intracavity elements. Phrases like, “the first device light and the second device light reaching first polarization redirection optics (PPBS1) comprise linear polarized light” or “the third device light reaching the first polarization redirection optics (PPBS1) comprises linear polarized light”, and similar phrases may indicate that the device light generating by the respective light generating device comprises polarized light, and / or to such device light a polarization may be imposed. For instance, one or more of the first device light, the second device light, and the third device light may be linear polarized light or may be elliptically polarized light. However, also polarization optics may be applied to impose the desired polarization. In embodiments, the first device light received by the first polarization redirection optics may especially be polarized light or a polarization may be imposed to the first device light, e.g. with a polarizer. Hence, the light generating system may be configured such that the first device light reaching the first redirection optical element may comprise polarized light. In embodiments, the first device light reaching the first redirection optical element may especially comprise linear polarized first device light, such as e.g. p-polarized first device light and / or s-polarized first device light. The first light generating device may, in embodiments, be configured to provide linear polarized first device light. Additionally or alternatively, in embodiments, the first device light may be unpolarized or elliptically (such as circularly) polarized light and a polarization control system (e.g. comprising a polarizer, see also further below) may be configured such that linear polarized first device light may be provided to the redirection optical element. Likewise, in embodiments, the second device light received by the first polarization redirection optics may especially be polarized light or a polarization may be imposed to the second device light, e.g. with a polarizer. Hence, the light generating system may be configured such that the second device light reaching the first redirection optical 2023PF80451 15 element may comprise polarized light. In embodiments, the second device light reaching the first redirection optical element may especially comprise linear polarized second device light, such as e.g. p-polarized second device light and / or s-polarized second device light. The second light generating device may, in embodiments, be configured to provide linear polarized second device light. Additionally or alternatively, in embodiments, the second device light may be unpolarized or elliptically (such as circularly) polarized light and a polarization control system (e.g. comprising a polarizer, see also further below) may be configured such that linear polarized second device light may be provided to the redirection optical element. Likewise, in embodiments, the third device light received by the first polarization redirection optics may especially be polarized light or a polarization may be imposed to the third device light, e.g. with a polarizer. Hence, the light generating system may be configured such that the third device light reaching the first redirection optical element may comprise polarized light. In embodiments, the third device light reaching the first redirection optical element may especially comprise linear polarized third device light, such as e.g. p-polarized third device light and / or s-polarized third device light. The third light generating device may, in embodiments, be configured to provide linear polarized third device light. Additionally or alternatively, in embodiments, the third device light may be unpolarized or elliptically (such as circularly) polarized light and a polarization control system (e.g. comprising a polarizer, see also further below) may be configured such that linear polarized third device light may be provided to the redirection optical element. Furthermore, in embodiments, the diffuser system may comprise one or more beam profilers. In embodiments, a beam profiler may be configured between the polarization converter and the diffuser (relative to the propagation of light through the system). The beam profiler may especially be configured to adapt a light radiance distribution of the diffused device light received by the beam profiler. Therefore, in embodiments, the beam profiler may, e.g., comprise an engineered diffuser, such as a top-hat diffuser or any other tailored intensity profile adjusting diffuser. Such embodiments may be beneficial as the beam profiler may allow for matching the radiance distribution of the diffused device light with the luminescent material light radiance distribution. As indicated above, the diffuser system may be configured to diffuse at least part of the device light received by the diffuser system into diffused device light. Also herein, the term “device light” may refer to device light from one or more of the light generating devices (such as from one or more of the first light generating device, the second light 2023PF80451 16 generating device, and the third light generating device), that may reach the diffuser system via the optics. Especially, during operation the diffuser system may be irradiated by (i) one or more first device light, second device light, and third device light, that may reach the diffuser system via the polarization based redirection optics (PPBS1), and optionally other optics. In embodiments, the light generating system may further comprise a control system. In embodiments, the control system may be configured to control the system light (see also further below). Especially, in embodiments, the control system may be configured to control a spectral power distribution of the system light, especially by controlling the distribution of device light provided to the luminescent material and to the diffuser system. Further, in embodiments, the control system may be configured to control a radiant flux of the system light. Hence, in embodiments, the control system may be configured to control one or more of a correlated color temperature and a radiant flux of the system light. The control system may especially be configured to control said spectral power distribution by e.g. controlling the polarization control system (see also further below). Additionally or alternatively, in embodiments, the control system may be configured to control said spectral power distribution by controlling the light generating devices. Especially, in such embodiments, the control system may be configured to control the polarization of device light generated by one or more of the light generating devices. In particular, in embodiments, the control system may be configured to control the spectral power distribution of the system light by controlling the polarization control system (see below) and, optionally, the light generating devices. Furthermore, in embodiments, the control system may be configured to control the correlated color temperature of the system light by controlling the polarization control system. In particular, in embodiments, the control system may be configured to control the polarization control system such that in a first operational mode the system light has a first correlated color temperature (CCT1), and such that in a second operational mode the system light has a second correlated color temperature (CCT2). Especially, in embodiment, the control system may be configured to control the polarization control system, such that the CCT may be altered from CCT1 in the first operational mode to CCT2 in the second operational mode, and vice versa. Further, in embodiments, CCT2-CCT1≥250 K, like CCT2-CCT1≥500 K, such as CCT2-CCT1≥750 K, like, CCT2-CCT1≥1000 K. Especially, in embodiments, CCT2- CCT1≥1500 K. Further, in embodiments, CCT2-CCT1 may be at most 5000 K, such as at most 3000 K, like at most 2500 K. However, other embodiments may also be possible. 2023PF80451 17 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 to the element (determining the behavior or supervising the running of an element), etc., 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 in embodiments 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 lighting system, but may be (temporarily) functionally coupled to the lighting system. 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 also be adapted for providing another controlling mode, or a plurality of other controlling modes. 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 2023PF80451 18 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). Hence, in embodiments, the control system may control in dependence of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer. The term “timer” may refer to a clock and / or a predetermined time scheme. For instance, in embodiments, the control system may be configured to control the spectral power distribution of the system light (by controlling the polarization control system) in dependence of one or more of an input signal of a user interface, a sensor signal, and a timer. In further embodiments, the light generating system may comprise optics. The optics may, in embodiments, comprise redirection optics. Especially, in embodiments, the redirection optics may comprise one or more dichroic based redirection optics and one or more polarization based redirection optics. Dichroic based redirection optics may (be configured to) redirect received light in dependence of the spectral power (distribution) of the light, especially based on the wavelengths of the light. Polarization based redirection optics may (be configured to) redirect received light in dependence of the polarization of the light. In embodiments, the redirection optics may comprise first dichroic based redirection optics and second dichroic based redirection optics. In embodiments, the first dichroic based redirection optics may comprise a first dichroic beam splitter. Similarly, in embodiments, the second dichroic based redirection optics may comprise a second dichroic beam splitter. A dichroic beam splitters may especially be configured to split light received by the dichroic beam splitter and having different wavelengths into separate beams of light propagating in orthogonal directions relative to each other. The dichroic beam splitter may especially do so upon irradiation at an about 45° angle. Herein, in embodiments, a dichroic beam splitter may comprise one or more of a (flat or tile-shaped) dichroic mirror (e.g. a flat plat or tile comprising a dichroic coating), a dichroic cube (e.g. a cube comprising a diagonally oriented internal plane comprising a dichroic coating), and a dichroic sphere (e.g. a sphere comprising a cross-sectional internal plane comprising a dichroic coating). Additionally or alternatively, in embodiments, a dichroic beam splitter may be configured to combine light received by the dichroic beam splitter from orthogonal beams of light and having different wavelengths into a same optical path. The term “beam splitter” may herein thus also refer to a beam combiner. Herein, the phrase “an element configured to combine X and Y into a same optical path” and similar phrases may refer to the respective beams of light being provided 2023PF80451 19 (directly) downstream of the element such that their respective optical axes may be substantially parallel and / or may coincide. The term “optical axis” may especially be defined as an imaginary line that defines the path along which light propagates through a system. Especially, the optical axis may coincide with the direction of the light with the highest radiant flux. For explanatory purposes, the invention will herein primarily be described in the context of (dichroic and polarization) beam splitters. It will be clear to the person skilled in the art that the invention is not limited to such (dichroic and polarization) redirection optics and that alternative (dichroic and polarization or other) redirection optics may be used instead. The first dichroic redirection optics may be arranged in a (direct or indirect) light-receiving relationship with the first light generating device and with the second light generating device, i.e., the first light generating device and the second light generating device may be configured to provide (first and second) device light to the first dichroic redirection optics, optionally via one or more optical elements (see also below). The first light generating device and the second light generating device may especially be configured to provide the first device light and the second device light to the first dichroic redirection optics at a mutual angle of (about) 90º., i.e., the optical paths of the first device light and the second device light may, (directly) upstream of the first dichroic redirection optics, have a mutual angle selected from the range of 80º-100º, especially from the range of 85º-95º, such as a mutual angle of (about) 90º. The first dichroic redirection optics may be configured to combine received first device light and second device light, i.e., to combine the first device light and the second device light received by the first dichroic redirection optics. Hence, (directly) downstream of the first dichroic redirection optics, the optical paths of the first device light and the second device light may be oriented in essentially the same direction. An indirect light-receiving relationship may refer to the presence of one or more optical elements in an optical path between two elements that are configured in a light- receiving relationship. In particular, in embodiments, the first dichroic redirection optics may be configured to (a) transmit first device light and to reflect second device light, i.e., to transmit light having a first centroid wavelength λc1and to reflect light having a second centroid wavelength λc2, or (b) to reflect first device light and to transmit second device light, i.e., to reflect light having a first centroid wavelength λc1and to transmit light having a second centroid wavelength λc2. 2023PF80451 20 In further embodiments, the first dichroic redirection optics may, assuming irradiation with the received light at an average angle of incidence relative to a surface normal of the redirecting plane (of the redirection optics) of about 45°, be (i) at least 90% transmissive for (device light having) one of the first centroid wavelength (λc1) and the second centroid wavelength (λc2), and (ii) at least 90% reflective for (device light having) the other one of the first centroid wavelength (λc1) and the second centroid wavelength (λc2). The phrase “light at an average angle of incidence relative to a surface”, and similar phrases, may refer to an angle of incidence of an optical axis of that light to the surface. The second dichroic redirection optics may be arranged in a (direct or indirect) light-receiving relationship with one or more of the first polarization redirection optics, the second polarization redirection optics, the luminescent material, and the diffuser. In particular, the second dichroic redirection optics may be configured to (a) direct device light received from the first polarization redirection optics to the luminescent material and (b) to direct the luminescent material light (from the luminescent material) to the light exit. The phrase ‘to direct light to the light exit’ and similar phrases used herein do not exclude the presence of intermediate optical components. For instance, the second dichroic redirection optics may direct luminescent material light to the light exit via one or more intermediate optical components, such as via second polarization redirection optics (see below). In particular, in embodiments, the second dichroic based redirection optics may be configured to (a) transmit (blue) device light and to reflect luminescent material light, i.e., to transmit light in the wavelength range of λc1-λc2and to reflect luminescent material light, or (b) to reflect (blue) device light and to transmit luminescent material light, i.e., to reflect light in the wavelength range of λc1-λc2and to transmit light the luminescent material light. For instance, the second dichroic redirection optics may be configured to transmit light having a centroid wavelength in the blue wavelength range, and to reflect light having a centroid wavelength in the yellow wavelength range (or vice versa). In embodiments, the second dichroic redirection optics may, especially with a 45° angle of incidence of the device light and the luminescent material light, respectively, be (A) at least 80%, such as at least 90%, especially at least 95%, transmissive for one of (i) device light and (ii) the luminescent material light, and (B) at least 80%, such as at least 90%, especially at least 95%, reflective for the other one of (i) device light and (ii) the luminescent material light. For instance, in embodiments, the second dichroic redirection optics may be at 2023PF80451 21 least 90% transmissive for the device light (or for the luminescent material light), and at least 90% reflective for the luminescent material light (or for the device light). In embodiments, the second dichroic redirection optics may be configured downstream of one or more of the first polarization redirection optics and the second polarization redirection optics, especially of both the first polarization redirection optics and the second polarization redirection optics. In particular, in embodiments, the second dichroic beam splitter may be arranged downstream of both the first partial polarizing beam splitter and the second polarizing beam splitter (see below). Alternatively, in embodiments, the second polarization redirection optics may be configured downstream of one or more of the first polarization redirection optics and the second dichroic redirection optics, especially of both the first polarization redirection optics and the second dichroic redirection optics. Especially, in such embodiments, the second polarization redirection optics may be transmissive for the luminescent material light. In particular, in embodiments, the second polarizing beam splitter may be arranged downstream of the first partial polarizing beam splitter and of the second dichroic beam splitter. Besides the polarization and dichroic redirection optics, further optics may be used to (re-)orient and (eventually) combine the device light. For instance, in embodiments, a reflector may be arranged between (along an optical path) two of the redirection optics. In such embodiments, the reflector may especially comprise a specular reflector, as device light reflected by a specular reflector may (essentially) maintain its polarization state. In further embodiments, the second polarization redirection optics may be configured downstream of the first polarization redirection optics with a specular reflector configured in an optical path from the first polarization redirection optics to the second polarization redirection optics. In further embodiments, the second dichroic redirection optics may be configured downstream of the second polarization redirection optics with a specular reflector configured in an optical path from the second polarization redirection optics to the second dichroic redirection optics. In further embodiments a specular reflector may be configured in an optical path from the second dichroic redirection optics to the second polarization redirection optics or from. In further alternative embodiments such specular reflector may be configured between the first polarization redirection optics and the second dichroic redirection optics. Specular reflectors may be particularly suitable to adapt the actual position and / or orientation of components relative to each other to provide suitable interfaces (thermal, optical, mechanical, electrical) with the lighting fixtures in which these laser-phosphor light sources are used. 2023PF80451 22 As mentioned above, the redirection optics may (further) comprise polarization redirection optics. Especially, in embodiments, the redirection optics may comprise first polarization redirection optics and second polarization redirection optics. In embodiments, the first polarization redirection optics may comprise a first polarizing beam splitter, especially a first partial polarizing beam splitter. Similarly, the second polarization redirection optics (see below) may comprise a second polarizing beam splitter. As will be known to the person skilled in the art, polarizing beam splitters may be configured to split light received by the polarizing beam splitter into orthogonal beams of light having different (orthogonal) polarization. The polarizing beam splitter may especially do so upon irradiation at an about 45° angle. Additionally or alternatively, polarizing beam splitters may be configured to combine light received by the polarizing beam splitter from orthogonal beams of light and having different (orthogonal) (linear) polarizations into a same optical path. The first polarization redirection optics may especially comprise first partial polarization redirection optics. In particular, the first partial polarization redirection optics may be configured to substantially reflect s-polarized light, e.g., at least 90% of incident s- polarized light, while having a partial reflectance of p-polarized light, e.g., in the range of 30- 70% of incident p-polarized light. Such partial polarization redirection optics facilitate dynamically controlling the proportion of reflected and transmitted light by controlling the polarization status of incident light. Partial polarizing beam splitters may be configured to reflect (or transmit) (essentially) all light having a first polarization, e.g., an s-polarization, while partially reflecting and partially transmitting light having a second polarization, e.g., a p-polarization. Alternatively, partial polarizing beam splitters may be configured to partially reflect and partially transmit light having a first polarization, while also partially reflecting and partially transmitting light having a second polarization, especially wherein the proportion of reflected (and transmitted) light differs for the first polarization and the second polarization. In embodiments, the first polarization redirection optics may be (at least partly) reflective for s-polarized device light, such as at least 80% reflective for s-polarized device light, especially at least 90% reflective for s-polarized device light, such as at least 95% reflective for s-polarized device light. In embodiments, the first polarization redirection optics may have a reflectance rsfor s-polarized device light, wherein rsis selected from the range of ≥ 80%, such as ≥ 90%, especially ≥ 95%, including (essentially) 100%. 2023PF80451 23 In further embodiments, the first polarization redirection optics may be at least partly reflective and at least partly transmissive for p-polarized device light. In embodiments, the first polarization redirection optics may have a reflectance rpfor p-polarized device light selected from the range of 20-80%, especially for p-polarized first device light, such as for p- polarized light having a first centroid wavelength λc1, and / or especially for p-polarized second device light, such as for p-polarized light having a second centroid wavelength λc2, and / or especially for p-polarized third device light, such as for p-polarized light having a third centroid wavelength λc3. In embodiments, the reflectance rpmay be selected from the range of 30-70%, such as from the range of 40-60%. For instance, in embodiments, the first polarization redirection optics has, with respect to at least one of λc2and λc1, (A) a reflectance rsfor s-polarized device light of at least 80%, such as at least 90%, and (B) a reflectance rpfor p-polarized device light selected from the range of 20-80%, especially from the range of 30-70%. In particular, in such embodiments, the first polarization redirection optics may, with respect to at least one of λc2and λc1, further have a transmittance for p-polarized device light selected from the range of 80-20%, such as from the range of 70-30%. In particular, the reflectance and transmittance for p-polarized device light may sum up to at least 95%, such as at least 98%, including (essentially) 100%. It will be clear to the person skilled in the art that the reflectance and transmittance of an optical element, such as of a beam splitter, may depend on the angle of incidence of device light on the optical element. The values for reflectance and transmittance of an optical element, especially of a beam splitter, with respect to device light may herein specifically refer to the reflectance and transmittance as occurring when (an optical axis of) the device light makes an angle of 45° with the (relevant) optical element. For instance, with respect to cube polarizers, the incidence on the front surface may be (nominally) perpendicular, while incidence on the internal (diagonal) plane comprising the actual beam splitting / combining dielectric stack may nominally be at 45º incidence. The first polarization redirection optics may be configured to direct device light, in dependence of its polarization, to one or more of (a) the luminescent material (via the second dichroic redirection optics) and (b) the diffuser system (via second polarization redirection optics. Especially, the first polarization redirection optics may be configured to direct device light received from the first dichroic redirection optics, in dependence of its polarization, to one or more of (a) the luminescent material via the second dichroic redirection optics and (b) the diffuser system via the second polarization redirection optics 2023PF80451 24 (see below). Similarly, the first polarization redirection optics may be configured to direct device light received from the third light generating device, in dependence of its polarization, to one or more of (a) the luminescent material via the second dichroic redirection optics and (b) the diffuser system via the second polarization redirection optics (see below). For instance, in specific embodiments the following may apply: the first polarization redirection optics may have an rpvalue of 30% and an rsvalue of (essentially) 100%, the third device light may be (essentially) p-polarized, and the first polarization redirection optics may be configured to: (a) direct s-polarized first and second device light towards the luminescent material, (b) direct 30% of p-polarized first and second device light towards the luminescent material, (c) direct 70% of p-polarized first and second device light towards the diffuser, (d) direct 30% of the third device light towards the diffuser, and (e) direct 70% of the third device light towards the luminescent material. Similarly, in alternative specific embodiments the following may apply: the first polarization redirection optics may have an rpvalue of 70% and an rsvalue of (essentially) 100%, the third device light may be (essentially) p-polarized, and the first polarization redirection optics may be configured to: (a) direct s-polarized first and second device light towards the diffuser, (b) direct 30% of p- polarized first and second device light towards the diffuser, (c) direct 70% of p-polarized first and second device light towards the luminescent material, (d) direct 30% of the third device light towards the luminescent material, and (e) direct 70% of the third device light towards the diffuser. In such embodiments, the relative proportion of s-polarized light and p- polarized light in the (combined) first and second device light may thus (directly) influence the proportions of the (combined) first and second device light provided to the luminescent material vs. the diffuser. In other words, by controlling the proportion of s-polarized light and p-polarized light in the (combined) first and second device light, the CCT of the system light may be controlled. The light generating system may, in embodiments, comprise further light generating devices. Such further light generating devices may be configured to provide device light having a central wavelength in the range of – λc2, and may have a central wavelength and / or polarization selected such that the additional device light may be combined with the first, second, and third device light through further dichroic and / or polarization multiplexing. In embodiments, the light generating system thus comprises a polarization control system. The polarization control system may be configured to control a polarization 2023PF80451 25 of (at least part of) the device light propagating from the first dichroic redirection optics to the first polarization redirection optics. In embodiments, the polarization control system may be configured to control a polarization of the first device light (as provided to the first polarization redirection optics). Additionally or alternatively, in embodiments, the polarization control system may be configured to control a polarization of the second device light (as provided to the first polarization redirection optics). Control of the polarization of one of the first device light and the second device may provide a more stable output of the light generating system, and may, for instance, be considered when rp(see below) has a very low value. Generally, however, it may be preferred if the polarization of both of the first and the second device light is controlled as this may provide a larger dynamic range for tuning the CCT. In embodiments, the polarization control system may comprise a polarization rotator, especially a birefringent rotator, such as a half wavelength plate, or especially a Faraday rotator. Especially, in such embodiments, the polarization rotator may be configured in the optical path of the first device light, especially between the first light generating device and the first polarization redirection optics, such as between the first light generating device and the first dichroic redirection optics, or such as between the first dichroic redirection optics and the first polarization redirection optics. Alternatively or additionally, in embodiments, the polarization rotator may be configured in the optical path of the second device light, especially between the second light generating device and the first polarization redirection optics, such as between the second light generating device and the first dichroic redirection optics, or such as between the first dichroic redirection optics and the first polarization redirection optics. The polarization rotator may thus be configured to control a polarization of one or both of the first and second device light, especially of both of the first and second device light. In particular, in embodiments, the polarization rotator may especially be configured between (relative to the propagation of light through the system) the first dichroic based redirection optics and the first polarization based redirection optics. Hence, in embodiments, the polarization control system may comprise a polarization rotator configured downstream of the first dichroic redirection optics and upstream of the first polarization redirection optics, wherein the first device light and the second device light reaching the first polarization redirection optics comprise linear polarized light having the same linear polarizations, i.e., the first device light may have (essentially) the same linear polarization as the second device light. 2023PF80451 26 As described above, by controlling the polarization of the device light provided to the first polarization redirection optics, the proportion of device light provided to the luminescent material vs. the proportion of device light provided to the diffuser may be controlled. Hence, in embodiments, the control system (see above), may be configured to control the spectral power distribution of the system light by controlling the polarization rotator. The term “birefringent rotator” may herein refer to an element having a refractive index that may depend on the polarization of light incident on the birefringent rotator, i.e., the element may be characterized by two perpendicular optical axes in the plane of the element, with different refractive indices for perpendicularly incoming light with polarizations along these respective axes. In embodiments, through rotation of the birefringent rotator, and thus the rotation of the orientation of the optical axis of the birefringent rotator in a plane perpendicular to the optical axis of the incident light, relative to the plane of (linear) polarization of the incident light the linear polarization of that light may be changed. As such, in embodiments, the birefringent rotator may be configured to receive the device light emitted by the first light generating device and / or the second light generating device and may be configured to adjust (or control) the polarization of the device light, such that the (combined) first and second device light having a predetermined (linear) polarization will be provided to the first polarization redirection optics. Especially, in embodiments, the polarization control system may be configured to control rotation of the birefringent rotator, such that the polarization of the device light reaching the first polarization redirection optics is adjusted. The birefringent rotator may therefore, in embodiments, comprise a λ / 2 waveplate, wherein the wavelength ‘λ’ refers to a representative wavelength of the incoming beam of the device light, with which, upon rotation about the optical axis (of the birefringent rotator), the polarization of the incoming (linearly polarized) beam of device light can be rotated by any angle. In embodiments, with a λ / 2 waveplate configured in an optical path between (a) the first and second light generating devices and (b) the first polarization redirection optics, a linearly polarized beam of device light may thus be adjusted such that a beam of device light comprising any ratio of p / (s+p) and s / (s+p) may be provided to the first polarization redirection optics, wherein ‘p’ refers to the p-polarized fraction and ‘s’ refers to the s-polarized fraction relative to a splitting (transmitting vs reflecting) plane of the first polarization redirection optics. Hence, in embodiments, the polarization rotator may comprise a birefringent rotator, wherein the birefringent rotator comprises a λ / 2 waveplate, and wherein the polarization control system is configured to control rotation of the birefringent 2023PF80451 27 rotator. Especially, the control system may be configured to control the spectral power distribution of the system light by controlling the rotation of the birefringent rotator (by controlling the polarization control system). The polarization of the device light received by the first polarization redirection optics may alternatively (or additionally) be controlled by controlling an orientation of the light generating devices, especially by controlling an orientation of the first light generating device and / or the second light generating device. Hence, in embodiments, the control system, may be configured to control one or more of (i) an (rotational) orientation of the first light generating device relative to the first dichroic redirection optics, especially a rotational orientation around a (first) optical axis of the first device light, and (ii) an (rotational) orientation of the second device relative to the first dichroic redirection optics, especially a rotational orientation around a (second) optical axis of the second device light. In particular, in embodiments, the control system may be configured to (control the polarization control system to) control the spectral power distribution of the system light by controlling one or more of (i) an orientation of the first light generating device relative to the first dichroic redirection optics, and (ii) an orientation of the second device relative to the first dichroic redirection optics. In particular, in embodiments, the light generating system, especially the polarization control system, may comprise a movement element, especially a rotational element. The rotational element may comprise the first light generating device and / or the second light generating device, especially the first light generating device and the second light generating device. The rotational element may be configured to control a rotational orientation of the light generating device(s) relative to the first dichroic redirection optics. The rotational element may especially be configured to independently control the rotational orientations of the first light generating device and of the second light generating device. In particular, the rotational element may be configured to control a (linear) polarization of device light received by the first dichroic redirection optics (and by the first polarization redirection optics). In further embodiments, the rotational element may be configured to control a rotational orientation of the first light generating device, the second light generating device and the first dichroic redirection optics (together) relative to the first polarization redirection optics. In further embodiments, the movement element, especially the rotational element, may comprise (or “host”) at least the first light generating device. In such 2023PF80451 28 embodiments, the movement element may be configured to control (at least) a polarization of the first device light received by the first dichroic redirection optics. In further embodiments, the movement element, especially the rotational element, may comprise (or “host”) at least the second light generating device. In such embodiments, the movement element may be configured to control (at least) a polarization of the second device light received by the first dichroic redirection optics. In further embodiments, the movement element, especially the rotational element, may comprise (or “host”) the first light generating device and the second light generating device. In such embodiments, the movement element may be configured to control (at least) a polarization of the first device light and of the second device light received by the first polarization redirection optics. In further embodiments, the rotational element may further comprise the first dichroic redirection optics. Hence, in embodiments, the polarization control system, especially the movement element, may comprise a rotational element comprising the first light generating device, the second light generating device and the first dichroic redirection optics, wherein the control system is configured to control the spectral power distribution of the system light by controlling a rotation of the rotational element relative to the first polarization redirection optics. In further embodiments, the polarization control system may comprise one or more movement devices configured to one or more of (i) rotate the first light generating device and / or the second light generating device, especially by rotating the movement element, and (ii) rotate the polarization rotator, especially the birefringent rotator. Thus, the polarization control system may be configured to control a polarization of the (combined) first and second device light reaching the first polarization redirection optics. Especially, in embodiments, the polarization control system may be configured such that of combined first and second device light traveling from the first dichroic redirection optics and received by the first polarization redirection optics, x1% comprises a first linear polarization and y1% comprises a second linear polarization. In embodiments, x1 and y1 may be individually selected from the range of 0-100%, such as from the range of 10-90%, like from the range of 20-80%. The polarization control system may thus be configured such that the (combined) first and second device light provided to the first polarization redirection optics comprises (essentially) only light having a first linear polarization, e.g., (essentially) only p-polarized device light, or such that the (combined) first and second device light provided to the first polarization redirection optics comprises 2023PF80451 29 (essentially) only light having a second linear polarization, e.g., (essentially) only s-polarized device light, and may be configured adjustable to select distributions therebetween. Hence, in embodiments, the first device light and the second device light reaching the first polarization redirection optics, especially the first partial polarizing beam splitter, may comprise linear polarized light. In further embodiments, especially in an operational mode, (at least part of) the first device light and the second device light (reaching the first polarization redirection optics) may comprise p-polarized light. Additionally or alternatively, in the operational mode, (at least part of) the first device light and the second device light reaching the first polarization redirection optics may comprise s-polarized light. Further, in embodiments, the third device light reaching the first polarization redirection optics may (also) comprise linear polarized light, especially p-polarized device light. As described above, the light generating system, especially the optics, may further comprise second polarization redirection optics, especially a second polarizing beam splitter. The second polarization redirection optics may especially be configured to (A) direct device light received (directly or indirectly) from the first polarization redirection optics to the diffuser system and (B) direct the diffused device light received from the diffuser system to the light exit. In particular, as described above, the diffuser system may be configured to ‘flip’ a polarization state of the received device light, i.e., if p-polarized device light is provided to the diffuser system, the diffused device light received by the second polarizing beam splitter may be s-polarized device light, and vice versa. In embodiments, the second polarization redirection optics may, especially with 45° irradiation with the device light, be (A) at least 80%, such as at least 90%, especially at least 95% reflective for one of (i) s-polarized device light and (ii) p-polarized device light; and (B) at least 80%, such as at least 90%, especially at least 95% transmissive for the other one of (a) s-polarized device light and (b) p-polarized device light. For instance, in embodiments, the second polarization redirection optics may be at least 90% reflective for s- polarized device light (or for p-polarized device light) and at least 90% transmissive for p- polarized device light (or for s-polarized device light). The light generating system may, in embodiments, be configured to provide system light, especially to provide system light via the light exit. Herein, the term ‘light exit’ may refer to a position where system light escapes from the light generating system. The light exit may, in embodiments, be a light transmissive 2023PF80451 30 window or an opening (in the system). The light transmissive window may in embodiments be provided by an optical component. In embodiments, the light generating system, especially the control system, may have at least one operational mode. Especially, in an operational mode, the light generating system may be configured to provide system light. In embodiments, in one or more operational modes, this may be white light. The light generating system may thus, in embodiments, be configured to provide (in an operational mode of the light generating system) at the light exit one or more of luminescent material light and diffused device light. In other words, in embodiments, (the system light comprising) one or more of luminescent material light and diffused device light may emanate from the light generating system via the light exit. In embodiments, the light generating system may be configured to generate system light comprising one or more of at least part of the luminescent material light and at least part of the diffused device light. In embodiments, and especially in the operational mode, the system light may comprise (yellow-green) luminescent material light and (blue) diffused device light. Further, in embodiments, the system light may be white light comprising at least part of the luminescent material light and at least part of the diffused device light. Especially, the system light may, in one or more operational modes, be white light having a correlated color temperature selected from the range of 2000-12000 K, such as from the range of 2700-10000 K, especially from the range of 6000-10000 K, such as a correlated color temperature selected from the range of 6000-8000 K. Additionally or alternatively, in embodiments, in an operational mode of the light generating system the system light may be white light having a color rendering index of at least 60, such as at least 65, like at least 70, especially at least 80. Such embodiments may especially be beneficial for application of the light generating system in entertainment (spot) lighting applications. 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 K and 6500 K. In embodiments, the correlated color temperature (CCT) may especially be in the range of about 7000 K and 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, such as within 8 SDCM from the BBL, even more especially within about 5 SDCM 2023PF80451 31 from the BBL. In specific embodiments, the correlated color temperature (CCT) may be selected from the range of 6000-12000 K, like selected from the range of 7000-12000 K, like at least 8000 K. Yet further, in embodiments the correlated color temperature (CCT) may be selected from the range of 6000-12000 K, like selected from the range of 7000-12000 K, in combination with a CRI of at least 70. In further embodiments, the system light may be white light having a correlated color temperature selected from the range of 6000-10,000 K and a color rendering index of at least 65. As described above, it may be desirable to use (essentially) all power of the light generating devices, especially irrespective of the spectral power distribution of the system light. Hence, in embodiments, especially in the operational mode, the light generating devices may be configured to operate at (their respective) rated forward currents. Herein the term “rated forward current” may especially refer to a rated (as done by a manufacturer) of the forward current which a solid state light source (as specified above) may carry without damaging the light generating device. Especially, in embodiments, the light generating devices may be configured to operate at a maximum operating condition complying with lifetime and efficiency boundary conditions. More especially, the light generating devices may be configured to operate at one of maximum efficiency, maximum output, their nominal rated current, or operation conditions with a chosen trade-off between output power, efficiency, and lifetime. In further embodiments, the control system may be configured to control the spectral power distribution of the system light by controlling radiant fluxes of the light generating devices. As indicated above, the light generating system may comprise optics. The term “optics” may especially refer to (one or more) optical elements. Hence, the terms “optics” and “optical elements” may refer to the same items. The optics may include one or more of (specular or surface textured) mirrors, reflectors, collimators, lenses, prisms, diffusers, phase plates, polarizers, diffractive elements, gratings, dichroics, selectively reflective and / or selectively transmissive optics, arrays of one or more of the afore-mentioned, etc. Alternatively or additionally, the term “optics” may refer to a holographic element or a mixing rod. In embodiments, the optics may include one or more of beam expander optics and zoom lens optics. See further above for examples of optics. In embodiments, the optics may comprise an integrator, like a “Koehler integrator” (or “Köhler integrator”). In specific embodiments, the optics may comprise one or more of an integrating (or “homogenizing”) optics, collimating optics, condensing optics, and reflecting optics. For example, in 2023PF80451 32 embodiments, the luminescent material light and the diffused laser light may be provided (e.g. by the second dichroic redirection optics or the second polarization redirection optics as defined above) along the same optical path to the light exit, and the optics may comprise a beam homogenizer configured upstream of the light exit and configured to combine and homogenize the received light and to provide (homogenized white) system light to the light exit. As indicated above, in embodiments, the light generating system may comprise laser banks. Typically, the use of “laser banks”, being relatively dense assemblies of multiple laser diodes on a shared substrate that are commonly already provided with collimating lenses (typically in the form of a lens array comprising one lens per diode) may be convenient to project a beam of high power laser light onto a luminescent element without the need for using an inverse beam expander. In specific embodiments, a laser bank may therefore comprise an array of lenses (monolithic as multi-lens-array or as a set of discrete lenses). In such embodiments, individual lenses of the array of lenses may correspond with (or act on the individual laser beams from) individual lasers in the laser bank. As beams of light emitted from such (multi-chip packages and / or) laser banks may comprise multiple narrow laser beams, each individual laser beam may represent a hot spot in the beam of device light. Focusing of such a beam of device light on e.g. a luminescent material may exceed the maximum tolerable local irradiance and result in damage to the luminescent material, or other materials present in the luminescent material arrangement. Therefore, in embodiments, homogenizing optics may be applied and may especially be configured between (relative to the propagation of light through the system) the light generating devices (contributing to irradiation of the luminescent material) and (collimating optics of) the luminescent material. Similarly, in embodiments, homogenizing optics may be configured between (relative to the propagation of light through the system) the light generating devices (contributing to irradiation of the diffuser) and (collimating optics of) the diffuser. In further embodiments, the homogenizing optics may e.g. comprise one or more of a transmissive volume diffuser, a transmissive surface diffuser, a reflective surface diffuser, a transmissive or reflective diffractive optical element, a transmissive holographic optical element, a single multi lens array, a double multi lens array such as a fly- eye lens array, or an integrating polygonal light pipe that may be either solid (with propagation in the integrator based on total internal reflection) or hollow (with propagation in the integrator based on specular reflection). 2023PF80451 33 In further embodiments, the optics may comprise (at least) condensing optics. The condensing optics may especially comprise a first condensing optics configured (directly) upstream of the luminescent material and a second condensing optics configured (directly) upstream of the diffuser. Especially, in embodiments, the first condensing optics and the second condensing optics may each comprise at least one positive lens. In specific embodiments (such as e.g. when the luminescent material is configured in a reflective mode) the first condensing optics may comprise a first positive lens and a second smaller positive lens. In such embodiments, the smaller positive lens may especially be located between (relative to the propagation of light through the system) the first positive lens and the luminescent material or diffuser, respectively. In further embodiments, the optics may comprise (at least) collimator optics (or “collimating optics”), especially collecting and collimating optics. Especially, the optics may comprise a first collecting and collimating optics configured (directly) downstream of the luminescent material and a second collecting and collimating optics configured (directly) downstream of the diffuser. Especially, in embodiments, the first collecting and collimating optics and the second collecting and collimating optics may each comprise at least one positive lens, especially at least two positive lenses. In embodiments, the collimating optics and / or condensing optics, especially the lenses, may comprise glass materials, such as e.g. N- BK7, H-K51, B270, or fused silica (FS). The latter shows relatively low absorption and relatively low induced stress, but also has a relatively low refractive index. Therefore, if FS is used for all the lenses, in embodiments, the condensing optics for the reflective mode may preferably comprise three lenses. As described above, the light generating system may comprise a luminescent material. In embodiments, luminescent materials are 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. Especially, the luminescent material may be configured to convert at least part of the device light into luminescent material light, especially wherein the luminescent material comprises a (garnet) (first) 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. Hence, the luminescent material light may e.g. be green light or yellow light (or in specific embodiments even orange (dependent upon the composition of the garnet and cerium concentration)). However, other embodiments are also possible, see below. In 2023PF80451 34 embodiments, 0.05-10% of the A elements comprise Ce, even more especially 0.05-5%, such as 0.1-5%. Especially, embodiments, 0.1-3% of the A elements comprise Ce, such as up to 2%, like selected from the range of 0.1-1.5%, such as at least above 0.5%. The luminescent material may comprise an organic group that converts the light, or a molecule that converts the light, or an inorganic group that converts the light, etc. Hence, in specific embodiments the luminescent material comprises a (first) luminescent material of the type A3B5O12:Ce, wherein A in embodiments comprises one or more of Y, La, Gd, Tb and Lu, especially (at least) one or more of Y, Gd, Tb and Lu, and wherein B in embodiments comprises one or more of Al, Ga, In and Sc. 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. Embodiments of garnets especially include A3B5O12garnets, wherein A comprises at least yttrium or lutetium and wherein B comprises at least aluminum. Such garnets may be doped with cerium (Ce), with praseodymium (Pr) or a combination of cerium and praseodymium; especially however with Ce. Especially, B comprises aluminum (Al), however, B may also partly comprise gallium (Ga) and / or scandium (Sc) and / or indium (In), especially up to about 20% of Al, more especially up to about 10 % of Al (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. 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 A3B5O12wherein in specific embodiments at maximum 10% of B-O may be replaced by Si-N. 2023PF80451 35 In specific embodiments the luminescent material comprises (Yx1-x2-x3A’x2Cex3)3(Aly1-y2B’y2)5O12, wherein x1+x2+x3=1, wherein x3>0, wherein 0<x2+x3≤0.2, wherein y1+y2=1, wherein 0≤y2≤0.2, wherein A’ comprises one or more elements selected from the group consisting of lanthanides, and wherein B’ comprises one or more elements selected from the group consisting of Ga, In and Sc. In embodiments, x3 is selected from the range of 0.001-0.1. In the present invention, especially x1>0, such as >0.2, like at least 0.8. Garnets with Y may provide suitable spectral power distributions. 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 relatively high thermal stability, and allow a high CRI (optionally in combination with (the) light of other sources of light as described herein). Hence, in specific embodiments A may be selected from the group consisting of Lu and Gd. Alternatively or additionally, B may comprise Ga. Hence, in embodiments the luminescent material comprises (Yx1-x2-x3(Lu,Gd)x2Cex3)3(Aly1-y2Gay2)5O12, wherein Lu and / or Gd may be available. Even more especially, x3 is selected from the range of 0.001-0.1, wherein 0<x2+x3≤0.1, and wherein 0≤y2≤0.1. Further, in specific embodiments, at maximum 1% of B-O may be replaced by Si- N. Here, the percentage refers to moles (as known in the art); see e.g. also EP3149108. In yet further specific embodiments, the luminescent material comprises (Yx1-x3Cex3)3Al5O12, wherein x1+x3=1, and wherein 0<x3≤0.2, such as 0.001-0.1. In specific embodiments, A may especially comprise at least Y, and B may especially comprise at least Al. Alternatively or additionally, 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 specific embodiments, the luminescent material may comprise at least two different luminescent materials configured to provide luminescent material light having different spectral power distributions. As can be derived from the above, the term “different luminescent materials” may refer to luminescent materials that are different, or to two compositions, each including at least one luminescent material in common, but wherein the compositions differ. For instance, a primary luminescent material comprising luminescent materials A and B, and a secondary luminescent material comprising only A or only B, or 2023PF80451 36 comprising both A and B, but in a different weight ratio. Such primary luminescent material and secondary luminescent material may have different spectral power distributions of their respective luminescent material light. The garnet type luminescent material may also be described with an alternative formula A3B’2C’’3O12. Here, A may comprise one or more of (i) rare earth ions, such as one or more selected from Y3+, Lu3+, Gd3+, Tb3+, La3+, and (ii) divalent cations, such as Ca2+. Here, B may comprise one or more of (i) trivalent cations, such as one or more of Al3+, Ga3+, Sc3+, Sb3+, and In3+, and (ii) divalent cations, such as one or more of Mg2+and Mn2+. Here, C may comprise one or more of (i) trivalent cations, such as one or more of Ga3+and Al3+, (ii) divalent cations, such as Mn2+, and (iii) tetravalent cations, such as one or more of Si4+and Ge4+. With such ions, the garnet crystal structure can be maintained. Other substitutions than mentioned may also be possible. 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. Instead of quantum dots or in addition to quantum dots, also other quantum confinement structures may be used. The term “quantum confinement structures” should, in the context of the present application, be understood as e.g. quantum wells, quantum dots, quantum rods, tripods, tetrapods, or nano-wires, etcetera. Organic phosphors can (thus) be used as well. As indicated above, other luminescent materials may also be possible. Hence, in specific embodiments the luminescent material may be selected from the group of divalent europium containing nitrides, divalent europium containing oxynitrides, divalent europium containing silicates, cerium comprising garnets, and quantum structures. Quantum structures may also comprise photonic crystals. The luminescent material may be comprised by a luminescent body. The luminescent body may be a layer, like a self-supporting layer. The luminescent body may also be a coating. The luminescent body may also comprise a luminescent coating on a support (especially a light transmissive support in the transmissive mode). Especially, the luminescent body may essentially be self-supporting. In embodiments, the luminescent material may be provided as luminescent body, such as a luminescent single crystal, a luminescent glass, or a luminescent ceramic body. Such body may be indicated as “converter body” or “luminescent body”. In embodiments, the luminescent body may be a luminescent single crystal or a luminescent ceramic body. For instance, in embodiments a cerium 2023PF80451 37 comprising garnet luminescent material may be provided as a luminescent single crystal or as a luminescent ceramic body. In other embodiments, the luminescent body may comprise a light transmissive body, wherein the luminescent material is embedded. For instance, the luminescent body may comprise a glass body, with luminescent material embedded therein. Or, the glass as such may be luminescent. In other embodiments, the luminescent body may comprise a polymeric body, with luminescent material embedded therein. In specific embodiments, the luminescent body comprises a ceramic body comprising the luminescent material. Ceramic bodies are known in the art. Alternatively, the luminescent body comprises single crystal. In yet further specific embodiments, different types of luminescent bodies may be applied. Hence, the body may especially be selected from single crystalline bodies and ceramic bodies. The latter may be more easily made than the former, while they nevertheless may have good optical and / or thermal properties. Hence, in embodiments, the luminescent element may especially comprise a luminescent body comprising a luminescent material. Further, in embodiments, the (luminescent body comprising the) luminescent material may be configured in thermal contact with a thermally conductive material. Especially, in embodiments where the luminescent material is configured in the reflective mode, such thermal contact may be beneficial as the luminescent material may give rise to significant thermal dissipation. Similarly, in some embodiments, the diffuser may be configured in thermal contact with a thermally conductive material. An element may be considered in “thermal contact” with another element if it can exchange energy through the process of heat. Hence, the elements may be thermally coupled. In embodiments, thermal contact can be achieved by physical contact. In embodiments, thermal contact may be achieved via a thermally conductive material, such as a thermally conductive glue (or thermally conductive adhesive). Thermal contact may also be achieved between two elements when the two elements are arranged relative to each other at a distance of equal to or less than about 10 µm, though larger distances, such as up to 100 µm may be possible. The shorter the distance, the better the thermal contact. Especially, the distance is 10 µm or less, such as 5 µm or less, such as 1 µm or less. The distance may be the distanced between two respective surfaces of the respective elements. The distance may be an average distance. When the two elements are configured at a distance from each other, an intermediate material may be configured in between, though in other embodiments, the distance between the two elements may filled with a gas, liquid, or may be vacuum. When an intermediate material is available, the larger the distance, the higher the thermal conductivity may be useful for thermal contact between the two elements. 2023PF80451 38 However, the smaller the distance, the lower the thermal conductivity of the intermediate material may be (of course, higher thermal conductive materials may also be used). A thermally conductive material may especially have a thermal conductivity of at least about 20 W / (m*K), like at least about 30 W / (m*K), such as at least about 100 W / (m*K), like especially at least about 200 W / (m*K). In yet further specific embodiments, a thermally conductive material may especially have a thermal conductivity of at least about 10 W / (m*K). In embodiments, the thermally conductive material may be comprised by and / or configured in thermal contact with one or more of a heatsink, a heat spreader, and a two- phase cooling device. Another solution for the thermal management of the luminescent material may be to, in embodiments, apply (or mount) the (luminescent element especially the) luminescent material onto a rotating element, such as e.g. a rotating (phosphor-)wheel (or disk) or a rotating rod (or cylinder). Such embodiments may enable thermal spreading and cooling without the need for e.g. active water cooling, and thereby enabling maximum possible irradiance values. Hence, in embodiments, the luminescent material may be configured onto a rotating element. As mentioned above, the light generating system may comprise a diffuser. In embodiments, the diffuser may be a static diffuser. Alternatively, in embodiments, the diffuser may be a dynamic diffuser, such as e.g. a rotating wheel or a rotating rod, with a reflective diffuser track. Furthermore, in such embodiments, the rotating element may (also) comprise an additional track comprising an additional luminescent material (different from the first luminescent material). Such embodiments may be beneficial as the additional luminescent material may add further color point tunability along a line that may be substantially parallel or at least more parallel to the BBL in a targeted range of color temperatures. However, the skilled person will understand that, in such embodiments, further optical requirements may need to apply for the redirection optics. In contrast to a static diffuser, a dynamic diffuser may provide improved thermal behavior and / or may improve elimination of speckle in the white output light, but may add bulk to the engine volume and rotating mass. Hence, in embodiments, the diffuser may (also) be configured onto a rotating element. In some embodiments, the luminescent material and the diffuser may each be configured on a separate rotating element. Alternatively, in embodiments, the luminescent material and the diffuser may be configured on the same rotating element, such as e.g. combined as separate rings on a rotating wheel or a rotating rod. 2023PF80451 39 As described above, the light generating system may comprise three (or more) light generating devices. A light generating device may especially be configured to generate device light. Especially, the light generating device may comprise a light source. The light source may especially configured to generate light source light. Further, a light generating system may comprise a light escape surface, such as an end window. 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 LED light source (such as an LED or laser diode (or “diode laser”)). The term “light source” may refer to a semiconductor light-emitting device, such as a light emitting diode (LEDs), a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSELs), an edge emitting laser, etc... The term “light source” may also refer to an organic light-emitting diode (OLED), such as a passive-matrix (PMOLED) or an active-matrix (AMOLED). In a specific embodiment, the light source comprises a solid-state light source (such as an LED or laser diode). In an embodiment, the light source comprises an LED (light emitting diode). The terms “light source” or “solid state light source” may also refer to a superluminescent diode (SLED). The term “light source” may also relate to a plurality of (essentially identical (or different)) light sources, such as 2-2000 solid state light sources (such as LEDs or laser diodes (or “diode lasers”)).Hence, the term LED may also refer to a plurality of LEDs. 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). In embodiments the light source may comprise a laser light source. The term “laser light source” may also refer to a plurality of (different or identical) laser light sources. In this way, a higher brightness may be obtained. In embodiments, laser light sources may be arranged in a laser bank (see also above). The laser bank may in embodiments comprise heat sinking and / or optics e.g. a lens to collimate the laser light. Hence, in embodiments lasers in a laser bank (or “laser array bank”) may share the same optics. The term “laser light source” may herein especially refer to a laser. Such laser may especially be configured to generate laser light source light having one or more wavelengths in the UV, visible, or infrared, especially having a wavelength selected from the spectral wavelength range of 200-2000 nm, such as 300-1500 nm. The term “laser” especially refers to a device that emits light through a 2023PF80451 40 process of optical amplification based on the stimulated emission of electromagnetic radiation. Especially, in embodiments the term “laser” may refer to a solid-state laser. In specific embodiments, the terms “laser” or “laser light source”, or similar terms, refer to a laser diode (or diode laser). In embodiments, the terms “laser” or “solid state laser” or “solid state material laser” may refer to one or more of a semiconductor laser diodes (may also be indicated as “laser diodes” or diode lasers”), such as GaN, InGaN, AlGaInP, AlGaAs, InGaAsP, lead salt, vertical cavity surface emitting laser (VCSEL), quantum cascade laser, hybrid silicon laser, etc. Especially, the term “solid state material laser”, and similar terms, may refer to a solid state laser like based on a crystalline or glass body doped with ions, like transition metal ions and / or lanthanide ions, to a fiber laser, to a photonic crystal laser, to a semiconductor laser, such as e.g. a vertical cavity surface-emitting laser (VCSEL), etc. The laser light source may be configured to generate laser light source light (or “laser light”). The light source light may essentially consist of the laser light source light. The light source light may also comprise laser light source light of two or more (different or identical) laser light sources. For instance, the laser light source light of two or more (different or identical) laser light sources may be coupled into a light guide, to provide a single beam of light comprising the laser light source light of the two or more (different or identical) laser light sources. In specific embodiments, the light source light is thus especially collimated light source light. In yet further embodiments, the light source light is especially (collimated) laser light source light. The laser light source light may in embodiments comprise one or more bands, having band widths as known for lasers. In specific embodiments, the band(s) may be relatively sharp line(s), such as having full width half maximum (FWHM) in the range of less than 20 nm at RT, such as equal to or less than 10 nm. Hence, the light source light has a spectral power distribution (intensity on an energy scale as function of the wavelength) which may comprise one or more (narrow) bands. The beams (of light source light) may be focused or collimated beams of (laser) light source light. The term “focused” may especially refer to converging to a small spot. This small spot may be at the discrete converter region, or (slightly) upstream thereof or (slightly) downstream thereof. Especially, focusing and / or collimation may be such that the cross-sectional shape (perpendicular to the optical axis) of the beam at the discrete converter region (at the side face) is essentially not larger than the cross-section shape (perpendicular to the optical axis) of the discrete converter region (where the light source light irradiates the discrete converter region). Focusing may be executed with one or more optics, like (focusing) lenses. Especially, two lenses may be applied to focus the laser light source light. Collimation 2023PF80451 41 may be executed with one or more (other) optics, like collimation elements, such as lenses and / or parabolic mirrors. In embodiments, the beam of (laser) light source light may be relatively highly collimated, such as in embodiments ≤2° (FWHM), more especially ≤1° (FWHM), most especially ≤0.5° (FWHM). Hence, ≤2° (FWHM) may be considered (highly) collimated light source light. Optics may be used to provide (high) collimation (see also above). A light-emitting diode (LED), such as e.g. a single-junction light emitting diode or multi-junction light-emitting diode, is especially a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor may recombine with electron holes, releasing energy in the form of photons. The color of the light (corresponding to the energy of the photons) may be determined by the energy required for electrons to Superluminescent diodes are known in the art. A superluminescent diode may be indicated as a semiconductor device which may be able to emit low-coherence light. Especially, superluminescent diodes may combine the high power and brightness of laser diodes with the low coherence of conventional light-emitting diodes. The low (temporal) coherence of the source has advantages that the speckle is significantly reduced or not visible, and the spectral distribution of emission is much broader compared to laser diodes, which can be better suited for lighting applications. Hence, in embodiments, the solid state light source may comprise a superluminescent diode. For instance, in further specific embodiments, the solid state light source may comprise a GaN-based superluminescent diode, or an InGaN-based superluminescent diode, or an AlGaN-based superluminescent diode. In a further aspect, the invention may provide a lighting device comprising the light generating system of the invention. The lighting device may especially be selected from the group of a lamp, a luminaire, a projector device, a disinfection device, a photochemical reactor, and an optical wireless communication device. Hence, the invention may also provide a lamp or a luminaire comprising the light generating system as defined herein. The luminaire may further 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” 2023PF80451 42 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 device may include one or more light generating systems such as described herein. Hence, in an aspect 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. The lighting device may comprise a housing or a carrier, configured to house or support, one or more elements of the light generating system. 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”. 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. The light source(s) may during operation especially emit (light source light) at least light at a wavelength selected from the range of 200-490 nm, especially a light source that during operation emits at least light at wavelength selected from the range of 400-490 nm, even more especially in the range of 440-490 nm. Hence, in a specific embodiment, the light source(s) are configured to generate blue 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 may especially refer to a wavelength selected from the range of 190-380 nm, such as 200-380 nm. Herein, IR (infrared) may especially refer to radiation having a wavelength selected from the range of 780-3000 nm, such as 780-2000 nm, e.g. a wavelength up to about 1500 nm, like 2023PF80451 43 a wavelength of at least 900 nm, though in specific embodiments other wavelengths may also be possible. 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. The terms “blue light” or “blue emission” especially relates to light having a wavelength in the range of about 440-495 nm (including some violet and cyan hues). The terms “green light” or “green emission” especially relate to light having a wavelength in the range of about 495-570 nm. The terms “yellow light” or “yellow emission” especially relate to light having a wavelength in the range of about 570-590 nm. The phrase “light having one or more wavelengths in a wavelength range” and similar phrases may especially indicate that the indicated light (or radiation) has a spectral power distribution with at least intensity or intensities at these one or more wavelengths in the indicate wavelength range. For instance, a blue emitting solid state light source will have a spectral power distribution with intensities at one or more wavelengths in the 440-495 nm wavelength range. 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.1-8 schematically depict embodiments of the light generating system; Fig.9 schematically depicts an embodiment of the lighting device. The schematic drawings are not necessarily to scale. DETAILED DESCRIPTION OF THE EMBODIMENTS Fig.1-8 schematically depict embodiments of light generating systems 1000. In the depicted embodiments, the light generating system 1000 comprises three light generating devices 110,120,130, a luminescent material 200, a control system 300, optics 500, a polarization control system 600, a diffuser system 1710, and a light exit 1090. In particular, each of the light generating devices 110,120,130 comprise a solid-state light source 10,20,30 selected from the group of diode lasers, superluminescent diodes, and multi- junction diodes. In embodiments, the first light generating device 110 comprises a first laser 2023PF80451 44 bank comprising a plurality of first solid-state light sources 10, especially first lasers, wherein the second light generating device 120 comprises a second laser bank comprising a plurality of second solid-state light sources 20, especially second lasers, and wherein the third light generating device 130 comprises a third laser bank comprising a plurality of third solid-state light sources 30, especially third lasers. The first light generating device 110 may be configured to provide first device light 111 having a first centroid wavelength λc1. Similarly, the second light generating device 120 may be configured to provide second device light 121 having a second centroid wavelength λc2and the third light generating device 130 may be configured to provide third device light 131 having a third centroid wavelength λc3.Especially, the first centroid wavelength λc1and the second centroid wavelengths λc2may differ, especially differ by at least 2 nm, such as at least 5 nm. Especially, the first centroid wavelength λc1and the second centroid wavelengths λc2may differ sufficiently for a first dichroic redirection element, such as a first dichroic beam splitter, to combine the first device light 101 and the second device light 121, as schematically depicted in Fig.1. In particular, in embodiments, 5 nm ≤ |λc1-λc2| ≤ 60 nm, especially 10 nm ≤ |λc1-λc2| ≤ 50 nm. For a consistent effect of the second dichroic redirection optics and the luminescent material with respect to the first, second and third device light 111,121,131, it may be particularly convenient for the third device light 131 to have a third central wavelength selected from the range of the central wavelengths of the first and second device light 111,121. Hence, in embodiments, λc1≤ λc3≤ λc2or λc2≤ λc3≤ λc1may apply. As described above, the light generating system 1000 may allow converting (a) part of the device light 111,121,131 into luminescent material light 201 via a luminescent material 200 and (b) part of the device light 111,121,131 into diffused device light 711 via the diffuser system 1710, especially via the diffuser 710. Hence, in embodiments, the luminescent material 200 may be configured to convert at least part of the device light received by the luminescent material 200 into luminescent material light 201. In further embodiments, the diffuser system 1710 comprises an arrangement of a polarization converter 720 and a diffuser 710; wherein the diffuser system 1710 is configured to diffuse at least part of the device light received by the diffuser system 1710 into diffused device light 711. Fig.1-8 schematically depict different embodiments varying in the arrangement of the components of the system, particularly with respect to the optics and the polarization control system. For explanatory purposes, the embodiment of Fig.1 will be 2023PF80451 45 discussed below in detail, and the embodiments of the remaining figures will be discussed with a focus on their differences relative to the embodiment depicted in Fig.1. Fig.1 schematically depicts an embodiment wherein the optics 500 comprise redirection optics 510, wherein the redirection optics 510 comprise polarization based redirection optics PPBS1, PBS2 and dichroic redirection optics DBS1, DBS2. In particular, in embodiments, the polarization redirection optics PPBS1, PBS2 may comprise (A) first polarization redirection optics PPBS1, such as a first polarizing beam splitter, especially a first partial polarizing beam splitter PPBS1, and (B) second polarization redirection optics PBS2, especially a second polarizing beam splitter. In further embodiments, the dichroic redirection optics DBS1, DBS2 may comprise first dichroic redirection optics DBS1, especially a first dichroic beam splitter, and dichroic redirection optics DBS2, especially a second dichroic beam splitter. In the depicted embodiment, the first dichroic redirection optics DBS1 is configured to combine first device light 111 and second device light 121 received by the first dichroic redirection optics DBS1. For instance, in embodiments, the first dichroic redirection optics DBS1 may be (i) at least 90% transmissive for (light having) one of the first centroid wavelength λc1and the second centroid wavelength λc2, and (ii) at least 90% reflective for (light having) the other one of the first centroid wavelength λc1and the second centroid wavelength λc2(assuming 45° irradiation with the device light), such as transmissive for the second centroid wavelength λc2and reflective for the first centroid wavelength λc1in the depicted embodiment. In particular, in the depicted embodiment, the first dichroic redirection optics DBS1 is configured to provide combined first and second device light 111,121 to the first polarization redirection optics PPBS1 via (at least part of) the polarization control system 600, especially via the birefringent rotator 610. The polarization control system 600 is, in the depicted embodiment, configured to control a polarization of device light propagating from the first dichroic redirection optics DBS1 to the first polarization redirection optics PPBS1. In particular, in the depicted embodiment, the polarization control system 600 comprises a polarization rotator 610 configured downstream of the first dichroic redirection optics DBS1 and upstream of the first polarization redirection optics PPBS1. Hence, in the depicted embodiment the polarization control system 600 may be configured to control the polarization of both the first device light 111 and of the second device light 121 as received by the first polarization redirection optics PPBS1. In particular, in such embodiments, the first device light 111 and the second device light 121 reaching the first polarization redirection optics PPBS1 may 2023PF80451 46 comprise linear polarized light having (essentially) the same linear polarizations, i.e., with (essentially) the same distribution of s-polarized light and p-polarized light. In particular, in the depicted embodiment, the polarization control system 600 may control a movement element 620 configured to rotate the polarization rotator 610, thereby controlling the polarization of first and second device light 111,121 traveling through the polarization rotator 610. Especially, the polarization rotator 610 may comprise a birefringent rotator, wherein the birefringent rotator comprises a λ / 2 waveplate (with respect to with respect to a wavelength in the range of λc1to λc2), and control system 600 is configured to control rotation of the birefringent rotator, especially by controlling the movement element 620. In embodiments, the first device light 111 and the second device light 121 reaching the first polarization redirection optics PPBS1 may thus comprise linear polarized light. In further embodiments, the third device light 131 reaching the first polarization redirection optics PPBS1 may (also) comprise linear polarized light, especially p-polarized device light. In the depicted embodiment, the first polarization redirection optics PPBS1 is configured to distribute the received device light 111, 121, 131 towards the second dichroic redirection optics DBS2 and towards the second polarization redirection optics PBS2, in both cases via other optical elements, such as via a specular reflector 650 for device light 111,121,131 provided to the second polarization redirection optics. In particular, the first polarization redirection optics PPBS1 may direct the device light 111, 121, 131 based on the linear polarization of the device light 111, 121, 131. Especially, the first polarization redirection optics PPBS1 may be configured to direct device light received from the first dichroic redirection optics DBS1 (and from the third light generating device 130), in dependence of its polarization, to one or more of (a) the luminescent material 200 via second dichroic redirection optics DBS2 and (b) the diffuser system 1710 via second polarization redirection optics PBS2. The first polarization redirection optics PPBS1 may especially be at least partly reflective for s-polarized device light, such as at least 90% reflective for s- polarized device light, and (ii) at least partly reflective and at least partly transmissive for p- polarized device light. Due to the partial reflectance and partial transmittance of p-polarized device light and the (essentially) complete reflectance for s-polarized device light, the control system may control the proportions of device light provided to the luminescent material and to the diffuser system 1710, and thereby the spectral properties of the system light 1001, by 2023PF80451 47 controlling the polarization control system 600. Table 1 indicates various distributions that could be made depending on the reflectance of the first polarization redirection optics for p- polarized light (different values of rp), assuming – for explanatory purposes –a reflectance of 100% for s-polarized light (i.e., rs=1) and equal optical powers provided by the different light generating devices 110, 120, 130: rprsp1+2s1+2p3Tlum Tdif Tsys 0,3 1 0 1 1 2,7 0,3 3 0,3 1 0,5 0,5 1 2 1 3 0,3 1 1 0 1 1,3 1,7 3 0,5 1 0 1 1 2,5 0,5 3 0,5 1 0,5 0,5 1 2 1 3 0,5 1 1 0 1 1,5 1,5 3 0,7 1 0 1 1 2,3 0,7 3 0,7 1 0,5 0,5 1 2 1 3 0,7 1 1 0 1 1,7 1,3 3 In particular, table 1 indicates: the proportion of p-polarized device light and of s-polarized device light that is reflected as rpand rs, respectively, wherein the proportion of p-polarized device light and of s-polarized device light that is transmitted equals 1-rpand 1-rs, respectively; the proportion of the combined first and second device light 111, 121 that is p- polarized (p1+2) and s-polarized (s1+2); the proportion of the third device light 131 that is p- polarized (p3); and the total amount of device light 111,121,131 arriving at the luminescent material (Tlum), arriving at the diffuser system (Tdif) and exiting the light generating system as system light 1001 (Tsys), wherein (for explanatory purposes) no optical losses are assumed and each light generating device 110,120,130 contributes the same amount of device light, i.e., each light generating device 110,120,130 contributes 1 ‘device output’ to the system light. In particular Tlumand Tdifmay, with respect to the embodiment of Fig.1, be defined as: −The factor 2 accounts for the combined first and second device light 111,121 comprising the ‘device output’ of both the first and second light generating devices 110, 120. As indicated in the table above, for an rpof 0.3, the contribution of luminescent material light 201 in the system light 1001 can be set in the range of 1,3 – 2,7 device output out of a total of 3 device output, i.e., in the range of (about) 43% to 90% of the system light 1001. Similarly, for an rpof 0.3, the contribution of diffused device light 711 can 2023PF80451 48 be set in the range of 0.3 – 1.7 device output out of a total of 3 device output, i.e., in the range of 10% to (about) 57%. As may be appreciated from table 1, a low value of rpmay provide a larger dynamic range than a higher value of rp. A low value of rpmay thus be preferred in applications where a large dynamic range is desired. In embodiments, the first polarization redirection optics PPBS1 may especially have a reflectance for p-polarized device light (rp) selected from the range of 0.1 – 0.5, such as from the range of 0.2 – 0.4. In the embodiment of Fig.1, the device light 111,121,131 provided to the diffuser system 1710 is provided thereto via (at least) the second polarization redirection optics PBS2. The second polarization optics PBS2 are configured to direct device light received from the first polarization redirection optics PPBS1 to the diffuser system 1710 and to direct diffused device light 711 (received from the diffuser system 1710) to the light exit 1090. In particular, as the first polarization redirection optics PPBS1 may have a reflectance for s-polarized device light of (essentially) 100%, and as the third device light 131 may be (essentially) p-polarized device light, (essentially) all device light 111,121,131 arriving at the second polarization redirection optics PBS2 may be p-polarized. The second polarizing beam splitter PBS2 may thus especially be configured to transmit p-polarized device light 111,121,131, thereby directing (essentially) all device light received from the first polarization redirection optics PPBS1 towards the diffuser system 1710. For instance, in embodiments, the second polarization redirection optics PBS2 may be at least 90% reflective for one of (i) s-polarized device light and (ii) p-polarized device light; and at least 90% transmissive for the other one of (a) s-polarized device light and (b) p-polarized device light. In the depicted embodiment, the second polarization redirection optics PBS2 may be at least 90% reflective for s-polarized device light and at least 90% transmissive for p-polarized device light. As described above, the diffuser system 1710 may comprise a polarization converter 720 and a diffuser 710, which may (together) be configured such that the diffused device light 711 comprises a linear polarization different from the linear polarization of the device light 111, 121, 131 received by the diffuser system 1710. In other words, the diffused device light 711 may (essentially) be s-polarized light, which may be (predominantly) reflected by the second polarization redirection optics PBS2 towards the light exit 1090, i.e., the second polarization redirection optics PBS2 may be configured to direct the diffused device light 711 to the light exit 1090, especially via the second dichroic redirection optics DBS2. 2023PF80451 49 As schematically depicted in Fig.1, the second dichroic redirection optics DBS2 may be configured to: (a) direct device light received from the first polarization redirection optics PPBS1 to the luminescent material 200, (b) direct luminescent material light 201 received from the luminescent material 200 to the light exit 1090, and (c) direct diffused device light 711 received from the second polarization redirection optics PBS2 to the light exit 1090. In particular, in the depicted embodiment, the second dichroic redirection optics DBS2 is configured downstream of both the first polarization redirection optics PPBS1 and the second polarization redirection optics PBS2. In particular, in the depicted embodiment, the second dichroic redirection optics DBS2 may be configured to transmit device light (having a central wavelength λcin the range of λc1-λc2) and to reflect luminescent material light 201. Thereby, as schematically depicted in Fig.1, the second dichroic redirection optics DBS2 may effectively act as a dichroic beam combiner configured to combine the diffused device light 711 and the luminescent material light 201 to provide system light 1001 from the light exit 1090. In embodiments, the second dichroic redirection optics DBS2 may be at least 90% transmissive for one of (i) device light 101 and (ii) the luminescent material light 201, and at least 90% reflective for the other one of (i) device light 101 and (ii) the luminescent material light 201. In the embodiment depicted in Fig.1, the second dichroic redirection optics DBS2 may be at least 90% transmissive for the device light 101 and at least 90% reflective for the luminescent material light 201. As described above, the luminescent material light 201, and thus the luminescent material 200, may be selected such that the combination of luminescent material light 201 and the diffused device light 711 results in white light. Hence, the light generating system 1000 may be configured to generate system light 1001; wherein in an operational mode of the light generating system 1000 the system light 1001 is white light comprising at least part of the luminescent material light 201 and at least part of the diffused device light 711. In particular, in embodiments, the control system 300 may be configured to control a spectral power distribution of the system light 1001, especially by controlling the polarization control system 600 (see above), especially by controlling the polarization rotator 610. In particular, in embodiments, the control system 300 may be configured to control the polarization control system 600 such that: (i) in a first operational mode the system light 1001 has a first correlated color temperature CCT1, and (ii) in a second operational mode the system light 1001 has a second correlated color temperature CCT2; and 2023PF80451 50 wherein CCT2-CCT1≥1000K; and wherein in an operational mode of the light generating system 1000 the system light 1001 is white light having a correlated color temperature selected from the range of 6000-10000 K and a color rendering index of at least 65. In the depicted embodiment, the second polarization redirection optics PBS2 is configured downstream of the first polarization redirection optics PPBS1 with a specular reflector 650 configured in an optical path from the first polarization redirection optics PPBS1 to the second polarization redirection optics PBS2. The specular reflector 650 may essentially reflect the device light 111,121,131 without affecting the linear polarization thereof. Furthermore, in the depicted embodiment, the optics 500 comprise collimation (“or condensing”) optics 560 and integrating (or “homogenizing”) optics 570. As the beams emitted from multi-chip packages / laser banks may comprise multiple narrow laser beams, each individual laser beam may represent a hot spot in the beam. Focusing of such beam on e.g. a luminescent converter may exceed the maximum tolerable local irradiance and result in damage to the luminescent material, the matrix material if present, or other materials present in the luminescent material assembly. Therefore, some homogenizing optics 570 may be applied along the optical path of the beam. Such homogenization, when realized by (holographic, engineered / diffractive, or refractance- based) diffusers or integrating lens arrays, may be accompanied by some beam broadening. To keep the broadening limited, such homogenizers may preferably be located between PPBS1 and DBS2 for the conversion channel, and between the specular mirror and PBS2 for the diffusion channel. Alternatively, potentially leading to more beam broadening, the homogenizing optics 570 may be located between the first DBS and PPBS1 and between the third light source and PPBS1, respectively. Fig.2, 3, 5 and 6 schematically depict embodiments wherein the second polarization redirection optics PBS2 is configured downstream of both the first polarization redirection optics PPBS1 and the second dichroic redirection optics DBS2. In such embodiments, the second polarization redirection optics PBS2 may (also) be transmissive for the luminescent material light 201, especially at least 90% transmissive for the luminescent material light 201. For instance, the filter may be a combination of a blue PBS with transmissive properties for longer wavelengths. Fig.3 and 6 schematically depict embodiments wherein the second dichroic redirection optics DBS2 are configured to reflect the device light 111,121,131 and to transmit the luminescent material light 201. In particular, in such embodiments the second dichroic 2023PF80451 51 redirection optics DBS2 may be at least 90% reflective for the device light and at least 90% transmissive for the luminescent material light 201. Fig.4, 5 and 6 schematically depict embodiments wherein the polarization rotator 610 is arranged between the second light generating device 120 and the first dichroic redirection element DBS1. For instance, in the embodiment of Fig.4, the polarization control system 600, especially the polarization rotator 610, may control the polarization of the (combined) first and second device light 111,121 by controlling (only) the polarization of the second device light 121. Such embodiments may, for instance, be considered if a relatively low tunability range is required as such system may be more robust within the desired tunability range (i.e., requiring lower accuracy of rotation setting for a targeted CCT) by enabling a larger required rotation of the rotator for the requested CCT change, which is enabled by reducing the amount of light of which the polarization is changed by the rotator. In addition, if centering of the adjustable range should be shifted, one may provide a fixed rotation of the polarization plane of the first light generating device 110, resulting in a fixed shift of the minimum amount of device light available for diffusion. This may be implemented via a second fixed rotator, or via a fixed rotation of the first light generating device. Alternatively or additionally, in further embodiments, a polarization rotator 610 may (also) be arranged between the first light generating device 110 and the first dichroic redirection element DBS1. Fig.7 schematically depicts an embodiment wherein the first polarization redirection optics PPBS1 comprises a dichroic coating that (selectively) reflects one of the first device light 111 and the second device light 121, while the other of the first device light 111 and the second device light 121 is reflected based on its polarization (see above). In embodiments, such a spectral requirement may be achieved by providing an optical layer (or coating), especially a dichroically active layer, to the first polarization redirection optics. For instance, in embodiments, the first polarization redirection optics may comprise a stack of dielectric layers with alternating refractive indices (and optionally alternating individual dielectric layer thicknesses). Fig.8 schematically depicts an embodiment wherein the control system 300, especially the polarization control system 600, is configured to control the spectral power distribution of the system light 1001 by controlling one or more of the (i) a rotational orientation of the first light generating device 110 (along an optical axis of the first device light 111) relative to the first dichroic redirection optics (DBS1), and (ii) a (rotational) orientation of the second light generating device 120 (along an optical axis of the second 2023PF80451 52 device light 121) relative to the first dichroic redirection optics (DBS1), especially by controlling the rotational orientation of the first light generating device 110, the second light generating device 120 and of the first dichroic redirection optics (DBS1) (along an optical axis of the combined first and second device light 111, 121). In particular, in the depicted embodiment, the polarization control system 600 comprises a movement element 620, especially a rotational element, comprising the first light generating device 110, the second light generating device 120 and the first dichroic redirection optics (DBS1), wherein the control system 300 is configured to control the spectral power distribution of the system light 1001 by controlling a rotation of the movement element relative to the first polarization redirection optics PPBS1. Hence, the polarization control system 600 may be configured to control the linear polarization of the (combined) first and second device light 111,121 by rotating a polarization rotator 610 and / or by controlling a (rotational) orientation of the first and / or second light generating devices 110,120 relative to the first dichroic redirection optics DBS1 and / or by controlling and / or by controlling a (rotational) orientation of an assembly of the first and second light generating devices and the first dichroic redirection optics DBS1 (including optics in between the light generating devices 110, 120 and the first dichroic redirection optics DBS1) relative to the first polarization redirection optics PPBS1. In embodiments, the control system 300 may (thus) be configured to control the spectral power distribution of the system light 1001 by controlling (the polarization control system 600 to control) a rotational orientation of the first and second light generating devices 110, 120 and / or by controlling the polarization rotator 610, especially in dependence of one or more of an input signal of a user interface 301, a sensor signal, and a timer. In summary, Fig.1 schematically depicts an embodiment wherein a first and a second blue laser light source emit at different wavelength but with equal polarization and with a wavelength difference (e.g., of 20 nm). A third blue laser light source emits at an wavelength in the range of the first and second laser light sources and provides p-polarized light. PPBS1 has a high reflectance (>90%) of s-polarized light and partial reflectance (30- 70%) of p-polarized light. The polarization of the light from, in this example, the first and the second source is adjusted via an adjustable polarization rotator, by which the fraction of diffused blue light in the engine output light is adjusted. The quarter wave plate between PBS2 and the reflective diffuser is designed for the average blue wavelength incident on the reflective diffuser. 2023PF80451 53 In further embodiments, transmission and reflection characteristics of the beam splitting / combining components may be varied, the relative locations of the luminescent material, the diffuse reflector, and the output white light channel are varied, and the position of the birefringent rotator is varied by which the achievable range of blue fractions that can be selected for diffusion vs phosphor excitation is varied as well. Fig.2 schematically depicts a first alternative embodiment, the luminescent material light 201 is not combined with the diffused device light 711 via the second dichroic redirection optics DBS2, but via the second polarization redirection optics PBS2. In this embodiment, the second polarization redirection optics PBS2 are (thus) transmissive for the luminescent material light 201. The selectable fractions for luminescent material light and diffuse device light may be (essentially) unchanged relative to the embodiment of Fig.1. Fig.3 schematically depicts a second alternative embodiment, wherein the second dichroic redirection optics DBS2 are not transmissive for device light and reflective for luminescent material light 201, but just the other way around: here the dichroic redirection optics DBS2 are transmissive for luminescent material light 201 and reflective for the device light. As for the embodiment of Fig.2, the second polarization redirection optics PBS2 are transmissive for the luminescent material light 201. The selectable fractions for luminescent material light and diffuse device light may be (essentially) unchanged relative to the embodiment of Fig.1. Fig.4 schematically depicts a third alternative embodiment, wherein the birefringent rotator is not located downstream of the first dichroic redirection optics DBS1, but upstream, between the second light generating device 120 and the first dichroic redirection optics DBS1. This configuration may have an altered range of blue / yellow ratios in the engine output light relative to the embodiments of Fig.1-3. For example, if the first light generating device provides (only) s-polarized light, then: rp= 30% enables selection of Tlumin the range of 0.3 – 1.0, and Tdifin the range of 2.0 – 2.7; rp= 50% enables selection of Tlumin the range of 0.5 – 1.0, and Tdifin the range of 2.0 – 2.5; and rp= 70% enables selection of Tlumin the range of 0.7 – 1.0, and Tdifin the range of 2.0 – 2.3. In such embodiments, the wavelength of the third device light may preferably be matched to that of the second device light, i.e., λc2= λc3, as the first device light would be fully reflected at PPBS1 and thus, in the layout of Fig.4, only second and third device light would be subject to polarization-based redirection and only second and third device light would be provided to the diffuser system. Thus, by matching the wavelengths of the second and third device light, the PBS filter characteristics for both PPBS1 and PBS2 may be easiest to realize, the 2023PF80451 54 requirements for the QWP may be easiest to realize (because no compensation for wavelength variation needs to be implemented), and by the latter the beam redirection at PBS2 is easiest to be maximized. Fig.5 schematically depicts a fourth alternative embodiment, wherein the alternative location of the polarization rotator 610 is combined with second dichroic redirection optics DBS2 that are transmissive for luminescent light, and for which (characteristics of) the second polarization redirection optics PBS2 are adapted accordingly.. The selectable fractions for luminescent material light and diffuse device light may be (essentially) unchanged relative to the embodiment of Fig.4. Further, as described above, in such embodiments, λc2may especially be equal to λc3. Fig.6 schematically depicts a fifth alternative embodiment, wherein the polarization rotator 610 again acts on a single light generating device 100, i.e. on the second light generating device 120, while the second dichroic redirection optics DBS2 is not reflective but transmissive for luminescent light (and not transmissive but reflective for device light). Again, the second polarization redirection optics PBS2 acts additionally as the beam combining element for luminescent light and diffused device light. The selectable fractions for luminescent material light and diffuse device light may be (essentially) unchanged relative to the embodiment of Fig.4. Further, as described above, in such embodiments, λc2may especially be equal to λc3. Fig.7 schematically depicts a sixth alternative embodiment, wherein the first polarization redirection optics PPBS1 are additionally provided with a dichroic mirror that reflects the first device light source light and transmits the second device light source light. Depending on the wavelength chosen for the third device light source light, this may lead to a variable selection of a fraction of the light of one or two device light sources that can be split off towards the reflective diffuser. Selectable fractions of blue light to be used for diffusion relate to the wavelength of the third device light source and the degree of reflectance of the PPBS for p-polarized light of the second device light source, and can be exemplified as follows: if (A) λc2= λc3then rp= 30% enables selection of Tdiffrom the range of 0.3 – 1 and of Tlumof 2 – 2.7; rp= 50% enables selection of Tdiffrom the range of 0.5 – 1, and of Tlumfrom the range of 2 – 2.5; and rp= 70% enables selection of Tdiffrom the range of 0.7 – 1, and of Tlumfrom the range of 2 – 2.3. Instead, if (B) λc1= λc3then rp= 30% enables selection of Tdiffrom the range of 1 – 1.7, and of Tlumfrom the range of 1.3 – 2 LB; rp= 50% enables selection of Tdiffrom the range of 1 – 1.5, and of Tlumfrom the range of 1.5 – 2; and rp= 70% enables selection of Tdiffrom the range of 1 – 1.3, and of Tlumfrom the range of 1.7 - 2. 2023PF80451 55 Fig.8 schematically depicts an embodiment wherein the rotation of the plane of polarization of the light from at least one of the light generating devices 100 is realized by (mechanical) rotation of one or more of the light generating devices 100 around the optical axis of their output light or by mechanical rotation of a light generating device assembly around the optical axis of the combined output light from that assembly. An implementation showing a movement element 620 for rotating both the first and second light generating devices is presented in Figure 8. Fig.9 schematically depicts an embodiment of the lighting device 1200 comprising the light generating system 1000 of the invention. The lighting device 1200 may be 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. Specifically, Fig.9 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.3 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.3 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. 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. 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 2023PF80451 56 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 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. 2023PF80451 57 The invention also provides a control system that may control the device, apparatus, or system, or that may execute the herein described method or process. Yet further, the invention also provides a computer program product, when running on a computer which is functionally coupled to or comprised by the device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system. The invention further applies to a device, apparatus, or system comprising one or more of 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

2023PF80451 58 CLAIMS:

1. A light generating system (1000) comprising light generating devices (110,120,130), a luminescent material (200), a control system (300), optics (500), a polarization control system (600), a diffuser system (1710), and a light exit (1090); wherein: - each of the light generating devices (110,120,130) comprise a solid-state light source (10,20,30) selected from the group of diode lasers, superluminescent diodes, and multi-junction diodes; wherein (i) a first light generating device (110) is configured to provide first device light (111) having a first centroid wavelength (λc1), (ii) a second light generating device (120) is configured to provide second device light (121) having a second centroid wavelength (λc2), and (iii) a third light generating device (130) is configured to provide third device light (131) having a third centroid wavelength (λc3); wherein |λc1-λc2| ≥ 5 nm; - the luminescent material (200) is configured to convert at least part of the device light received by the luminescent material (200) into luminescent material light (201): - the diffuser system (1710) comprises an arrangement of a polarization converter (720) and a diffuser (710); wherein the diffuser system (1710) is configured to diffuse at least part of the device light received by the diffuser system (1710) into diffused device light (711); - the optics (500) comprise redirection optics (510); wherein the redirection optics (510) comprise polarization based redirection optics (PPBS1,PBS2) and dichroic based redirection optics (DBS1,DBS2); - a first dichroic redirection optics (DBS1) is configured to combine first device light (111) and second device light (121) received by the first dichroic redirection optics (DBS1); - the polarization control system (600) is configured to control a polarization of device light propagating from the first dichroic redirection optics (DBS1) to the first polarization redirection optics (PPBS1); - the first device light (111) and the second device light (121) reaching first polarization redirection optics (PPBS1) comprise linear polarized light; wherein the third2023PF80451 59 device light (131) reaching the first polarization redirection optics (PPBS1) comprises linear polarized light; - the first polarization redirection optics (PPBS1) is (i) at least partly reflective for s-polarized device light, and (ii) at least partly reflective and at least partly transmissive for p-polarized device light; the first polarization redirection optics (PPBS1) is configured to direct device light received from the first dichroic redirection optics (DBS1), in dependence of its polarization, to one or more of (a) the luminescent material (200) via second dichroic redirection optics (DBS2) and (b) the diffuser system (1710) via second polarization redirection optics (PBS2); - the second dichroic redirection optics (DBS2) is configured to direct device light received from the first polarization redirection optics (PPBS1) to the luminescent material (200) and to direct the luminescent material light (201) to the light exit (1090); - the second polarization redirection optics (PBS2) is configured to direct device light received from the first polarization redirection optics (PPBS1) to the diffuser system (1710) and to direct the diffused device light (711) to the light exit (1090); - the light generating system (1000) is configured to generate system light (1001); wherein in an operational mode of the light generating system (1000) the system light is white light (1001) comprising at least part of the luminescent material light (201) and at least part of the diffused device light (711); and - the control system (300) is configured to control a spectral power distribution of the system light (1001).

2. The light generating system (1000) according to claim 1, wherein: (a) the first centroid wavelength (λc1), the second centroid wavelength (λc2), and the third centroid wavelength (λc3) are individually selected from the wavelength range of 430-490 nm; (b) the first polarization redirection optics (PPBS1) has a reflectance for s-polarized device light of at least 90%, and a reflectance for p-polarized device light selected from the range of 20-80% for at least one of λc2and λc1; (c) wherein the first device light (111) and the second device light (121) comprise p-polarized device light; and (d) the light generating system (1000) is configured to generate in an operational mode of the light generating system (1000) system light (1001) comprising at least part of the luminescent material light (201) and at least part of the diffused device light (711), wherein the system light (1001) is white light having a correlated color temperature selected from the range of 6000-10,000 K and a color rendering index of at least 65.2023PF80451 60 3. The light generating system (1000) according to any one of the preceding claims, wherein the polarization control system (600) comprises a polarization rotator (610) configured downstream of the first dichroic redirection optics (DBS1) and upstream of the first polarization redirection optics (PPBS1), and wherein the first device light (111) and the second device light (121) reaching the first polarization redirection optics (PPBS1) comprise linear polarized light having the same linear polarizations.

4. The light generating system (1000) according to claim 3, wherein the control system (300) is configured to control the spectral power distribution of the system light (1001) by controlling the polarization rotator (610).

5. The light generating system (1000) according to claim 4, wherein the polarization rotator (610) comprises a birefringent rotator, wherein the birefringent rotator comprises a λ / 2 waveplate; wherein the polarization control system (600) is configured to control rotation of the birefringent rotator.

6. The light generating system (1000) according to any one of the preceding claims, wherein the control system (300) is configured to control the spectral power distribution of the system light (1001) by controlling one or more of (i) an orientation of the first light generating device (110) relative to the first dichroic redirection optics (DBS1), and (ii) an orientation of the second device (120) relative to the first dichroic redirection optics (DBS1).

7. The light generating system (1000) according to any one of the preceding claims, wherein the light generating devices (110,120,130) are configured to operate at rated forward currents.

8. The light generating system (1000) according to any one of the preceding claims 1-6, wherein the control system (300) is configured to control the spectral power distribution of the system light (1001) by controlling radiant fluxes of the light generating devices (110,120,130).2023PF80451 61 9. The light generating system (1000) according to any one of the preceding claims, wherein 10 nm ≤ |λc1-λc2| ≤ 50 nm.

10. The light generating system (1000) according to any one of the preceding claims, wherein λc1≤ λc3≤ λc2or λc2≤ λc3≤ λc1applies.

11. The light generating system (1000) according to any one of the preceding claims, wherein: (a) the second polarization redirection optics (PBS2) is at least 90% reflective for one of (i) s-polarized device light and (ii) p-polarized device light; and at least 90% transmissive for the other one of (a) s-polarized device light and (b) p-polarized device light; and (b) the second dichroic redirection optics (DBS2) is at least 90% transmissive for one of (i) device light and (ii) the luminescent material light (201), and at least 90% reflective for the other one of (i) device light and (ii) the luminescent material light (201).

12. The light generating system (1000) according to any one of the preceding claims 1-11, wherein the second dichroic redirection optics (DBS2) is configured downstream of both the first polarization redirection optics (PPBS1) and the second polarization redirection optics (PBS2).

13. The light generating system (1000) according to any one of the preceding claims 1-11, wherein the second polarization redirection optics (PBS2) is configured downstream of both the first polarization redirection optics (PPBS1) and the second dichroic redirection optics (DBS2); and wherein the second polarization redirection optics (PBS2) is transmissive for the luminescent material light (201).

14. The light generating system (1000) according to any one of the preceding claims, wherein the control system (300) is configured to control the polarization control system (600) such that: (i) in a first operational mode the system light (1001) has a first correlated color temperature (CCT1), and (ii) in a second operational mode the system light (1001) has a second correlated color temperature (CCT2); and wherein CCT2-CCT1≥1000K; and wherein in an operational mode of the light generating system (1000) the system light (1001) is white light having a correlated color temperature selected from the range of 6000- 10000 K and a color rendering index of at least 65.2023PF80451 62 15. A lighting device (1200) selected from the group of a lamp (1), a luminaire (2), and a projector device (3), comprising the light generating system (1000) according to any one of the preceding claims.

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