Laser-phosphor engine with three blue sources

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 diffuser arrangement (700), 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 arrangement (700) is configured to diffuse at least part of the device light received by the diffuser arrangement (700) 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 multichroic redirection optical element (DBS1) is configured to combine first device light (111) and second device light (121) received by the first multichroic redirection optical element (DBS1); a first polarization based redirection optical element (PPBS1) is configured (i) at least partly transmissive for p-polarized device light, and (ii) at least partly reflective and at least partly transmissive for s-polarized device light; wherein the first polarization based redirection optical element (PPBS1) is configured to direct device light received by the first polarization based redirection optical elements (PPBS1), in dependence of its polarization, in one or more of (a) an optical path to the luminescent material (200) and (b) an optical path to the diffuser arrangement (700); a second multichroic redirection optical element (DBS2) is configured to direct device light received from the first polarization based redirection optical element (PPBS1) to the luminescent material (200) and to direct the luminescent material light (201) to the light exit (1090); optics (500) are further configured to direct the device light received from the first polarization based redirection optical element (PPBS1) to the diffuser arrangement (700) 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]2024PF80205 1Laser-phosphor engine with three blue sourcesFIELD 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 adjustingapparatus or a second light path adjusting apparatus, and a first scattering optical system. Thelight 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 aremote phosphor converts laser light into converted light. A relatively straightforward way toproduce 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 componentsused, the engine volume is large due to the many components, and the system costs are high 2024PF80205 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 in which more than the output power of a single laser source can be used for luminescent conversion, while part of a laser source is used to contribute as blue light to the output white light. Furthermore, it may be desired for the lightengine to do so while using the full power of more than two laser banks while not increasingthe 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 maintainingoperation at full power, e.g., in the context of stage lighting. Hence, it is an aspect of the invention to provide an alternative light generatingsystem, which preferably further at least partly obviates one or more of above-describeddrawbacks. The present invention may have as object to overcome or ameliorate at least oneof 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 a first light generating device, a second light generating device, a thirdlight generating device, a luminescent material, a control system, optics, a diffuser arrangement, and a light exit. Especially, each of the light generating devices may comprise a 2024PF80205 3 solid-state light source selected from the group of diode lasers, superluminescent diodes, andmulti-junction diodes. In embodiments, (i) the first light generating device is configured toprovide first device light having a first centroid wavelength (λc1), (ii) the second lightgenerating device is configured to provide second device light having a second centroidwavelength (λc2), and (iii) the third light generating device is configured to provide thirddevice light having a third centroid wavelength (λc3). In embodiments, the first centroid wavelength (λc1), the second centroid wavelength (λc2), and the third centroid wavelength (λc3) may be individually selected from the wavelength range of 380-780 nm. In specific embodiments, λc2≠λc1, such as in more specific embodiments |λc1-λc2| ≥ 5 nm. Further, the optics may comprise redirection optics. In specific embodiments, the redirection optics may comprise a polarization based redirection optical element and multichroic based redirection optical elements. In embodiments, a first multichroic redirection optical element selected from the optics may be configured in a light-receiving relationship with the first light generating device and the second light generating device. As such, in embodiments, the first multichroic redirection optical element may be configured to combine first device light andsecond device light received by the first multichroic redirection optical element. Further, inembodiments, a first polarization based redirection optical element selected from the optics may be configured in a light-receiving relationship with (a) the first multichroic based redirection optical element and (b) the third light generating device. Especially, in suchembodiments, the first polarization based redirection optical element may be (i) at least partlytransmissive for p-polarized device light, and (ii) at least partly reflective and at least partly transmissive for s-polarized device light. The first polarization based redirection opticalelement may especially be configured to direct device light received by the first polarizationbased redirection optical elements (via the first multichroic based redirection optical elementsand from the third light generating device), in dependence of its polarization, in one or moreof (a) an optical path to the luminescent material (via a second multichroic based redirection optical element) and (b) an optical path to the diffuser arrangement. Further, the luminescentmaterial may be configured to convert at least part of the device light received by theluminescent material into luminescent material light. Further, in embodiments the diffuserarrangement may comprise (an arrangement of) a diffuser. In specific embodiments, thediffuser arrangement may be configured to diffuse at least part of the device light received bythe diffuser arrangement into diffused device light. Further, in embodiments, a secondmultichroic based redirection optical element selected from the optics may be configured in a light-receiving relationship with the first polarization based redirection optical element. In 2024PF80205 4 such embodiments, the second multichroic based redirection optical elements may be configured to direct device light received by the second multichroic based redirection optical elements in an optical path to the luminescent material and to direct the luminescent materiallight received by the second multichroic based redirection optical element in an optical pathto the light exit. In specific embodiments, the light generating system may be configured such that in an operational mode of the light generating system the first device light, the seconddevice light, and the third device light received by the first polarization redirection opticalelement may comprise linear polarized light. Further, in specific embodiments, at least one ofthe redirection optical elements may be configured to direct diffused device light received bythe optics from the diffuser arrangement in an optical path to the light exit. Especially, thelight generating system may be configured to generate, via the light exit, system light. Inspecific embodiments, in an operational mode of the light generating system the system lightmay comprise at least part of the luminescent material light and at least part of the diffuseddevice light. Further, in embodiments the control system may be configured to control (aspectral power distribution of) the system light. Hence, in specific embodiments, theinvention provides a light generating system comprising a first light generating device, a second light generating device, a third light generating device, a luminescent material, a control system, optics, a diffuser arrangement, and a light exit; wherein: (A) the light generating devices comprise solid-state light source selected from the group of diode lasers, superluminescent diodes, and multi-junction diodes; wherein (i) the first light generating device is configured to provide first device light having a first centroid wavelength (λc1), (ii) the second light generating device is configured to provide second device light having a second centroid wavelength (λc2), and (iii) the third light generating device is configured to provide third device light having a third centroid wavelength (λc3); wherein the first centroid wavelength (λc1), the second centroid wavelength (λc2), and the third centroid wavelength (λc3) are individually selected from the wavelength range of 380-780 nm; wherein |λc1-λc2| ≥ 5 nm; (B) the optics comprise redirection optical elements; wherein the redirection optical elements comprise a polarization based redirection optical element and multichroic basedredirection optical elements; (C) a first multichroic based redirection optical element selectedfrom the optics is (i) configured in a light-receiving relationship with the first light generating device and the second light generating device and is (ii) configured to combine first device light and second device light received by the first multichroic based redirection optical element; (D) a first polarization based redirection optical element selected from the optics is configured in a light-receiving relationship with (a) the first multichroic based redirection 2024PF80205 5 optical element and (b) the third light generating device, wherein the first polarization based redirection optical element is (i) at least partly transmissive for p-polarized device light, and (ii) at least partly reflective and at least partly transmissive for s-polarized device light; wherein the first polarization based redirection optical element is configured to direct device light received by the first polarization based redirection optical elements, in dependence of its polarization, in one or more of (a) an optical path to the luminescent material and (b) an optical path to the diffuser arrangement; (E) the luminescent material is configured to convert at least part of the device light received by the luminescent material from at least one of the light generating devices into luminescent material light: (F) a second multichroic based redirection optical elements selected from the optics is configured in a light-receiving relationship with the first polarization based redirection optical element, wherein the second multichroic based redirection optical elements is configured to direct device light received by the second multichroic based redirection optical elements in an optical path to the luminescent material and to direct the luminescent material light received by the secondmultichroic based redirection optical elements in an optical path to the light exit; (G) thediffuser arrangement comprises a diffuser; wherein the diffuser arrangement is configured to diffuse at least part of the device light received by the diffuser arrangement from at least oneof the light generating devices into diffused device light; (H) at least one of the redirectionoptical elements is configured to direct diffused device light received by the optics from thediffuser arrangement in an optical path to the light exit; (I) the light generating system isconfigured such that in an operational mode of the light generating system the first device light, the second device light, and the third device light received by the first polarization based redirection optical element comprise linear polarized light; (J) the light generating system is configured to provide, via the light exit, system light; wherein the control system is configured to control the system light; wherein in an operational mode of the light generating system the system light comprises one or more of at least part of the luminescent material light and at least part of the diffused device 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 isconverted to luminescent material light without adjusting the amount of generated (and used)device light. In particular, the polarization control system may be configured to adjust the 2024PF80205 6 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 apredetermined range of white light output color points (e.g. 6500 – 10000 K), with arelatively high accuracy of the calibration and / or use-case adjustment of the colortemperature. Yet further, with such a system the color point may easily be adjusted by theuser, for any of the color points selected in a predetermined range of white light output colorpoints (e.g. 6000 – 10000 K), while providing highly efficient collection of all the spectralcontributions 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 laser-phosphor engine with three blue sources. The light generating system (or “system”) may thus comprise light generating devices, a luminescent material, a control system, optics, a diffuser arrangement, 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 comprise a first solid state light source. Hence, in embodiments, the first light generating 2024PF80205 7 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 alsocomprise 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 asfrom 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 (second light source of the) second light generating device may comprise a second solid state 2024PF80205 8 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 especiallybe combined via redirection optical elements, especially via multichroic based redirectionoptical elements, such as via a dichroic beam splitter (DBS1; see below). Hence, the devicelight 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, especiallywherein 10 nm ≤ |λc1-λc2| ≤ 50 nm, such as wherein 15 nm ≤ |λc1-λc2| ≤ 30 nm. In particular,the difference between the first centroid wavelength λc1 and the second centroid wavelengthλc2 may be selected to be large enough to facilitate efficient combining via multichroic basedredirection optical elements, 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 comprisea third light source. The third light source may be essentially any light source, see also furtherbelow. 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 a stacked multi-junction light-emitting diode (LED). The third light generating device may 2024PF80205 9 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 aplurality of third lasers. Further, in embodiments, the third light generating device mayespecially 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, inembodiments, the third device light may be blue light. However, in alternative embodiments,the third device light may have a third centroid wavelength (λc3) selected from the wavelength range of 380-780 nm. For example, in embodiments, the third device light may be red light. In embodiments, 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., λc3 may be selected from the range of λc1 – λc2. For instance, in embodiments, λc1=λc3. Infurther embodiments, λc2=λc3. In particular, in embodiments, λc1 ≤ λc3 ≤ λc2 or λc2 ≤ λc3 ≤ λc1applies (though still |λc1-λc2| ≥ 1 nm, more especially |λc1-λc2| ≥ 5 nm, may apply). Having λc3in the range of λc1 and λc2 may 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 allowstaying 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 therange of 430-490 nm, especially from the range of 445-470 nm. In further embodiments,within the indicated range, λc1 and λc2 may differ, e.g., by at least 5 nm, and λc3 may inembodiments be selected from the range of λc1 – λc2.Further, in embodiments, (in an operational mode of the light generating system) one or more of the first light generating device, the second light generating device, and the third light generating device may be operated at a constant drive current. In 2024PF80205 10 embodiments, one or more of the light generating devices may especially be operated at their respective rated forward currents. Alternatively, in embodiments, one or more of the lightgenerating devices may especially be operated at their respective rated maximum forwardcurrents. In specific embodiments, one or more of the light generating devices may beoperated at their respective rated forward currents, rated maximum forward currents, orcurrents in between these former two. Especially, in embodiments, the light generating devices may be configured to operate at rated forward currents. Yet, in embodiments, pulsedoperation of one or more of the light generating devices may be applied.In embodiments, the optics may be configured in a light receiving relationship with the light generating devices. The optics may especially comprise redirection optical elements, i.e., optical elements configured to (re-)direct light received by the redirection optical element into a specific optical path. In embodiments, the redirection optical elements may comprise a polarization based redirection optical element and a multichroic based redirection optical element. Moreover, in embodiments, the redirection optical elements may comprise one or more polarization based redirection optical elements and one or more multichroic based redirection optical elements. In embodiments via polarization multiplexing, device light from different light generating devices may be (combined or) split (or “separated into different optical paths”) provided that they differ in (linear) polarization. For instance, s-polarized light and p- polarized light may be split, or elliptically polarized light comprising relatively more p- polarization than s-polarization, and elliptically polarized light comprising relatively more s- polarization than p-polarization may be split with a polarization-based redirection optical element (which may also be indicated as polarizing beam combiner or polarizing beam splitter). Alternatively (or additionally), in embodiments via multichroic multiplexing, device light from different light generating devices may be combined (or split or “separated into different optical paths”) provided that they differ in spectral power distribution. For instance, device light having different centroid wavelengths may be combined, or device light having (substantially) different spectral power distributions may be combined with a multichroic-based redirection optical element (which may also be indicated as dichroic beam combiner or dichroic beam splitter). In embodiments, the multichroic based redirection optical element may essentially comprise a spectral filter, such as e.g. a high-pass spectralfilter, a low-pass spectral filter, or a combination thereof (also referred to as a band-pass orband-block filter). 2024PF80205 11 In embodiments, in an operational mode part of the first device light and part of the second device light may propagate in an optical path to the luminescent material. This optical path may be via one or more optical elements, and may e.g. include a multichroic based redirection optical element, see also below. Yet, in embodiments, in an operational mode (which may be the same as just mentioned), one or both of the following may apply: (i) part of the first device light may propagate in an optical path to the diffuser arrangement and (ii) part of the second device light may propagate in an optical path to the diffuser arrangement. This optical path may be via one or more optical elements, and may e.g. (also) include a multichroic based redirection optical element, see also below. The latter multichroic based redirection optical element is herein indicated as first multichroic based redirection optical element. The first multichroic based redirection optical element may be configured in an optical path between (i) the first light generating device and the luminescent material, (ii) the first light generating device and the diffuser arrangement, (iii) the second light generating device and the luminescent material, and (iv) the second light generating device and the diffuser arrangement. Hence, in embodiments, the first multichroic based redirection optical element may be configured in a light-receiving relationship with (both) the first light generating device and the second light generating device. In embodiments, the first multichroic based redirection optical element may be configured to combine the first device light and the second device light received by the multichroic based redirection optical element. Especially, the first multichroic based redirection optical element may be configured to combine the first device light and the second device light such that the combined first and second device light may propagate from the first multichroic based redirection optical element in the same direction, i.e., along a same optical path (especially in an optical path to the first polarization based redirection opticalelement, see also further below). Herein, the phrase “an element configured to combine Xand Y into a same optical path” and similar phrases may refer to the respective beams of light being provided (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. Hence, the first device light and the second device light have different spectral power distributions. Especially, in embodiments they may have emission peaks at different 2024PF80205 12 peak wavelengths. In embodiments, peak wavelength of emission peaks of the first device light and second device light may differ at least 5 nm, such as at least 10 nm. In embodiments, peak wavelength of emission peaks of the first device light and second device light may differ at least 15 nm, such as at least 20 nm. Hence, in specific embodiments the first device light has a first peak wavelength (λp1) selected from the wavelength range of 430-490 nm, wherein the second device light has a second peak wavelength (λp2) selected from the wavelength range of 380-780 nm, and wherein |λp1-λp2| ≥ 10 nm. In this way, inembodiments, the first multichroic based redirection optical element may direct (i) the firstdevice light received by the first multichroic based redirection optical element and (ii) thesecond device light received by the first multichroic based redirection optical element in an optical path to the first polarization based redirection optical element. Note that whether ornot the first multichroic based redirection optical element receives first device light maydepend upon whether or not the first device is operating. Similarly, whether or not the firstmultichroic based redirection optical element receives second device light may depend upon whether or not the second device is operating. Hence, in embodiments the optics may comprise a first multichroic based redirecting optical element configured (a) in an optical path between the first light generating device and the first polarization based redirecting optical element and (b) in an optical path between the second light generating device and the first polarization based redirecting optical element; wherein the first multichroic based redirecting optical element is configured todirect (i) first device light received from the first light generating device, and (ii) seconddevice light received from the second light generating device in an optical path to the first polarization based redirection optical element. Here below, some specific embodiments are described. General aspects in relation to the first multichroic based redirecting optical element may also apply to other multichroic based redirecting optical elements that may be applied in the current invention. A multichroic beam splitter (such as a dichroic beam splitter) may be considered an example of (multichroic based) redirectional optics or (multichroic based) redirecting optics. Two beams of light orthogonally propagating to the multichroic beam splitter, and with different spectral power distributions may be combined in a single beam comprising both spectral power distributions and propagating along an axis parallel to an axis of one of the two beams of light with spectral power distributions orthogonally propagating to the multichroic beam splitter. Hence, the term multichroic beam splitter may also refer to a multichroic beam combiner. However, the opposite may also be true, light propagating to the 2024PF80205 13 multichroic beam splitter and comprising intensity at different spectral positions, like light having a broad spectral power distribution, or light having different spectral peaks, or like light comprising a combination of first light having a first centroid wavelength and secondlight having a second centroid wavelength, different from the first centroid wavelength, etc.,may be split in two orthogonally propagating beams of light with different spectral power distributions. Hence, this provides the multichroic beam splitter its beam splitting function. Hence, for the multichroic beam splitter may apply that for a first wavelength range, the wavelength averaged transmission may be higher, like at least 10% points higher, such as at least 20% points higher, or even at least 30 % points, than for a second wavelength range (different from the first wavelength range). Similarly, for a first wavelength range, the wavelength averaged reflection may be lower, like at least 10% points lower, such as at least 20% points lower, or even at least 30 % points, than for a second wavelength range.Especially, in embodiments, the multichroic beam splitter may be configured to direct at least60%, like at least 80%, more especially at least 90%, such as at least about 95%, of (first) light having the first wavelength to a first direction and at least 60%, like at least 80%, more especially at least 90%, such as at least about 95%, of (second) light of the second wavelength to a second direction, wherein the directions may in embodiments have a mutual angle selected from the range 45-135°, such as about 90°. In embodiments, the first light may have a first centroid wavelength and the second light may have a second centroid wavelength, which may differ at least 5 nm, more especially at least about 10 nm. In embodiments the centroid wavelengths may differ at least about 15 nm. The percentage of the light may refer to a spectral power (e.g. in Watt). In embodiments, the term “multichroic beam splitter”, and similar terms mayrefer to a dichroic beam splitter. The multichroic beam splitter, especially the dichroic beamsplitter, may be an embodiment of a color separation element, such as described in US7070300, which is herein incorporated by reference. Especially, the color separation element may be selected from the group of a dichroic mirror, a dichroic cube, and a diffractive optical element. Optionally, the color separation element maybe provided using a hologram. Especially, the multichroic beam splitter may be a dichroic mirror or reflector. As indicated above, in embodiments, the optics, especially the redirection optical elements, may (further) comprise a first polarization based redirection opticalelement. In embodiments, the first polarization based redirection optical element may beconfigured in an optical path between (i) the first multichroic based redirection optical element and the luminescent material, (ii) the first multichroic based redirection optical 2024PF80205 14 element and the diffuser arrangement, (iii) the third light generating device and the luminescent material, and (iv) the third light generating device and the diffuser arrangement. Hence, in embodiments, the first polarization based redirection optical element may be configured in a light-receiving relationship with (a) the first multichroic based redirection optical element (DBS1) and (b) the third light generating device. In embodiments, for the first polarization based redirecting optical element one of the following may apply: (a) the first polarization based redirecting optical element may be fully reflective for s-polarized blue device light and fully transmissive for p-polarized blue device light; or (b) the first polarization based redirecting optical element may be fully transmissive for p-polarized blue device light and partly transmissive (and partly reflective) for s-polarized blue device light; or (c) the first polarization based redirecting optical element; may be fully reflective for s-polarized blue device light and partly transmissive (and partly reflective) for p-polarized blue device light; or (d) the first polarization based redirecting optical element may be partly reflective and partly transmissive for both s- polarized and p-polarized blue device light; wherein the polarization may be referenced to a splitting plane of the polarizing beam splitter or the partial polarizing beam splitter, wherein the splitting plane may be a plane at which the polarization based beam splitting (i.e.,transmission and reflection) takes place. Especially, in embodiments, the first polarizationbased redirecting optical element may be fully transmissive for p-polarized blue device light. In embodiments, the first polarization based redirecting optical element may thus be configured to transmit or reflect (device) light in dependence of its polarization. Especially, in embodiments, the first polarization based redirecting optical element may comprise a partially polarizing beam splitter. Hence, in embodiments, the first polarization based redirecting optical element may be configured to at least partially transmit and / or at least partially reflect (device) light in dependence of its polarization. The first polarization based redirecting optical element may be configured at least partially transmissive for (device) light received by the first polarization based redirecting optical element and (said (device) light) comprising a first linear polarization. Especially, in embodiments, the firstpolarization based redirecting optical element may be configured to transmit at least 60%,such as at least 70%, like at least 80%, especially at least 90%, more especially at least 95%, including 100% of the light (comprising the first linear polarization) received by the first polarization based redirecting optical element. Further, in such embodiments, the first polarization based redirecting optical element may be configured at least partiallytransmissive for light received by the first polarization based redirecting optical element and 2024PF80205 15 (said (device) light) comprising a second linear polarization. Especially, in embodiments, the first polarization based redirecting optical element may be configured to reflect at least 20%, such as at least 30%, like at least 40%, especially at least 50%, more especially at least 60%, of the light (comprising the second linear polarization) received by the first polarization based redirecting optical element. Yet further, in such embodiments, the first polarization based redirecting optical element may be configured at least partially reflective for light received by the first polarization based redirecting optical element and (said (device) light) comprising a second linear polarization. Especially, in embodiments, the first polarization based redirecting optical element may be configured to reflect at least 20%, such as at least 30%, like at least 40%, especially at least 50%, more especially at least 60% of the light (comprising the second linear polarization) received by the first polarization based redirecting optical element. In embodiments, the second linear polarization may especially be different from the first linear polarization. Especially, in embodiments the first linear polarization may be p-polarization and the second linear polarization may be s-polarization. Herein, the terms “p-polarization” and “s-polarization” may especially refer to the polarization of light when incident on (a light-receiving plane of) the light-receiving element, such as e.g. the firstpolarization based redirection optical element. Hence, in embodiments, the first polarizationbased redirection optical element may be configured to at least partially transmit p-polarizedlight received by the first polarization based redirection optical element and to at leastpartially transmit and at least partially reflect s-polarized light received by the firstpolarization based redirection optical element. Especially, in some embodiments, the firstpolarization based redirection optical element may be configured such that a ratio of theamount of s-polarized light being transmitted relative to the amount of p-polarized light being transmitted may be ≤0.9, such as ≤0.8, like ≤0.6, especially ≤0.4. Amounts of light may be based on the spectral power (of the light) (e.g. Watts). The first polarization based redirection optical element may thus be configured in a light-receiving relationship with the first multichroic based redirection optical element and the third light generating device. In specific embodiments the light generating system may be configured such that one or more of the first device light, the second device light, and the third device light received by the first polarization based redirecting optical element comprises linear polarized light. Especially, in such embodiments, the light generating system may be configured such that at least the third device light received by the first polarization based redirecting optical element comprises linear polarized light. 2024PF80205 16 Further, in embodiments, the first polarization based redirection optical element may be configured to direct device light received by the first polarization based redirection optical elements (via the first multichroic based redirection optical elements and from the third light generating device), in dependence of its polarization, in an optical path to the luminescent material. Additionally or alternatively, in embodiments, the first polarization based redirection optical element may be configured to direct device light received by the first polarization based redirection optical elements (via the first multichroic based redirection optical elements and from the third light generating device), in dependence of its polarization, in an optical path to the diffuser arrangement. Hence, in specific embodiments, a first polarization based redirection optical element selected from the optics is configured in a light-receiving relationship with (a) the first multichroic based redirection optical element and (b) the third light generating device,wherein the first polarization based redirection optical element is (i) at least partlytransmissive for p-polarized device light, and (ii) at least partly reflective and at least partly transmissive for s-polarized device light; wherein the first polarization based redirection optical element is configured to direct device light received by the first polarization based redirection optical elements, in dependence of its polarization, in one or more of (a) an optical path to the luminescent material and (b) an optical path to the diffuser arrangement. Hence, 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 the first polarization redirection optical element, be provided to a luminescentmaterial. The light generating system may thus comprise a luminescent material,especially a luminescent element comprising a luminescent material. The luminescent 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 firstluminescent material into first luminescent material light. The luminescent material may beconfigured 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. The first radiation may especially be provided by a (solid state) light source. Hence, in embodiments, the luminescent material may be configured toconvert at least part of (combined) device light received by the luminescent material into 2024PF80205 17 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 atleast 80%, more especially at least 90%, including 100% of the (combined) device lightreceived 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 controllingmode (for instance whether or not a light generating device provides light). The status maye.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 ormore of first device light and second device light, that may reach the luminescent material viathe first multichroic redirection optical element (DBS1) and the first polarization basedredirection optical element (PPBS1) (selected from the optics), and optionally other optics,and / or (ii) third device light, that may reach the luminescent material via the first polarizationbased redirection optical element (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 canconvert first radiation, especially one or more of UV radiation and blue radiation, into secondradiation. 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” 2024PF80205 18 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 materialthat 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 blueradiation, into (other) visible light. The luminescent material may in specific embodimentsalso convert radiation into infrared radiation (IR). Hence, upon excitation with radiation, the luminescent material emits radiation. The term “luminescence” may herein also refer tophosphorescence 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 afluorescent 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. In embodiments, the light generating system may further comprise a diffuserarrangement. The diffuser arrangement may especially comprise a diffuser. The diffuser may,in embodiments, be configured to diffuse at least part of the device light received by thediffuser arrangement into diffused device light. Especially, in embodiments, the diffuser maybe 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 arrangement, especially by the diffuser, intodiffused 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 thediffuser arrangement, 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 2024PF80205 19 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 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 arrangement 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 may, in embodiments, be configured to diffuse one or more of first device light, second device light and third device light received by the diffuser into diffused (first, second and / or third) device light. Especially, in embodiments, the diffuser may be configured to diffuse at least 50%, such as at least 60%, like at least 70%, especially at least 80%, more especially at least 90%, including 100% of the device light received by the diffuser (arrangement) into diffused device light. As described above, in embodiments, the diffuser may thus comprise a polarization maintaining diffuser. Therefore, 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 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. Further embodiments of the diffuser arrangement are described further below. Furthermore, in embodiments, the light generating system may be configured such that in an operational mode of the light generating system the first device light, the second device light, and the third device light received by the first polarization based redirection optical element (PPBS1) may comprise linear polarized light. 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 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 2024PF80205 20 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 based redirection optical element (PPBS1) comprise linear polarized light” or “the third device light reaching the first polarization based redirection optical element (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 based redirection optical element (PPBS1) may especially be polarized light or a polarization maybe imposed to the first device light, e.g. with a polarizer. Hence, the light generating systemmay be configured such that the first device light reaching the first polarization based redirection optical element may comprise polarized light. In embodiments, the first device light reaching the first polarization based 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 first polarization based redirection optical element. Likewise, the above described embodiments may apply for the second device light and the third device light received by the first polarization based redirection optical element 2024PF80205 21 The light generating system may thus, in an operational mode, be configured such that device light may propagate along an optical path to the luminescent material. Further, in such an operational mode, (as described above) luminescent material light may beprovided. Especially, in embodiments, the optics may be configured to receive luminescentmaterial light from the luminescent material. The luminescent material light may, by theoptics, be propagated in an optical path to the light exit. Therefore, in embodiments, theoptics, especially the redirection optical elements, may comprise a second multichroic basedredirection optical element (DBS2).In embodiments, the second multichroic based redirection optical element mayespecially be configured in an optical path between (i) the first polarization based redirectionoptical element and the luminescent material, and (ii) the luminescent material and the lightexit. Especially, in embodiments, the second multichroic based redirection optical element may be configured in a light-receiving relationship with the first polarization based redirection optical element. Further, in such embodiments, the second multichroic based redirection optical element may be configured in a light-receiving relationship with the luminescent material. As such, in embodiments, the second multichroic based redirection optical element may be configured to direct device light received by the second multichroic based redirection optical elements in an optical path to the luminescent material. Moreover, in embodiments, the second multichroic based redirection optical element may be configured to direct the luminescent material light received by the second multichroic based redirectionoptical elements in an optical path to the light exit. The phrase ‘to direct light to the lightexit’ and similar phrases used herein do not exclude the presence of intermediate optical components In some embodiments, the second redirection based optical element may further be configured in a light receiving relationship (optionally via one or more further optics) with the diffuser arrangement. As such, in embodiments, the second multichroic based redirection optical element may be configured to direct diffused device light received by the second multichroic based redirection optical element from the diffuser arrangement in an optical path to the light exit. Hence, in such embodiments, the second multichroic based redirection optical element may be configured to combine luminescent material light (received from the luminescent material) and diffused device light (received from the diffuser arrangement optionally via one or more other optics) in a same optical path to the light exit. However, in other embodiments, one or more other optical elements (such as e.g. a second polarization based redirection optical element, see also further below) may be 2024PF80205 22 configured to combine luminescent material light (received from the luminescent material via the second multichroic based redirection optical element) and diffused device light (received from the diffuser arrangement optionally via one or more other optics) in a same optical path to the light exit. Hence, in embodiments, at least one of the redirection optical elements may be configured to direct diffused device light received by the optics from the diffuser arrangement in an optical path to the light exit. 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- 2024PF80205 23 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. 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 alsobe 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 2024PF80205 24 mode in dependence of a sensor signal or a (time) scheme, may also be possible. The operation mode may in embodiments also refer to a system, or apparatus, or device, that can only operate in a single operation mode (i.e. “on”, without further tunability). 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. 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 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 2024PF80205 25 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 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 theterm “rated forward current” may especially refer to a rated value (as done by amanufacturer) 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. 2024PF80205 26 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 first polarization based redirection optical element may especially comprise a first partial polarization based redirection optical element. In particular, the first partial polarization based redirection optical element may be configured tosubstantially transmit p-polarized light, e.g., at least 90% of incident p-polarized light, whilehaving a partial transmittance of s-polarized light, e.g., in the range of 30-70% of incident s-polarized light. Such partial polarization based 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 transmit (or reflect)(essentially) all light having a first polarization, e.g., a p-polarization, while partiallyreflecting and partially transmitting light having a second polarization, e.g., an s-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 partial polarization based redirection optical elementmay be (at least partly) transmissive for p-polarized device light, such as at least 80%transmissive for p-polarized device light, especially at least 90% transmissive for p-polarized device light, such as at least 95% transmissive for p-polarized device light. In embodiments,the first partial polarization based redirection optical element may have a transmittance tp forp-polarized device light, wherein tpis selected from the range of ≥ 80%, such as ≥ 90%, especially ≥ 95%, including (essentially) 100%. In further embodiments, the first partial polarization based redirection optical element may be at least partly reflective and at least partly transmissive for s-polarized devicelight. In embodiments, the first polarization redirection optics may have a transmittance ts fors-polarized device light selected from the range of 20-80%, especially for s-polarized first device light, such as for s-polarized light having a first centroid wavelength λc1, and / or especially for s-polarized second device light, such as for s-polarized light having a second centroid wavelength λc2, and / or especially for s-polarized third device light, such as for s-polarized light having a third centroid wavelength λc3. In embodiments, the transmittance tsmay be selected from the range of 30-70%, such as from the range of 40-60%. 2024PF80205 27 For instance, in embodiments, the first polarization based redirection opticalelement has, with respect to at least one of λc2 and λc1, (A) a transmittance tp for p-polarizeddevice light of at least 80%, such as at least 90%, and (B) a transmittance ts for s-polarizeddevice light selected from the range of 20-80%, especially from the range of 30-70%. 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 transmittanceof an optical element, especially of a beam splitter, with respect to device light may hereinspecifically 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 based redirection optical element may be configured todirect device light, in dependence of its polarization, to one or more of (a) the luminescentmaterial (via the second multichroic based redirection optical element) and (b) the diffusersystem (optionally via the second polarization based redirection optical element). Especially, the first polarization based redirection optical element may be configured to direct devicelight received from the first multichroic based redirection optical element, in dependence ofits polarization, to one or more of (a) the luminescent material via the second multichroicbased redirection optical element and (b) the diffuser arrangement via the second polarizationbased redirection optical element (see below). Similarly, the first polarization basedredirection optical element 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) theluminescent material via the second multichroic based redirection optical element and (b) thediffuser arrangement via the second polarization based redirection optical element (seebelow). For instance, in specific embodiments the following may apply: the first polarization based redirection optical element may have a tsvalue of 30% and a tpvalue of (essentially) 100%, the third device light may be (essentially) s-polarized, and the firstpolarization based redirection optical element may be configured to: (a) direct p-polarizedfirst and second device light towards the luminescent material, (b) direct 30% of s-polarized first and second device light towards the luminescent material, (c) direct 70% of s-polarized first and second device light towards the diffuser, (d) direct 30% of the third device light 2024PF80205 28 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 based redirection optical element may have a ts value of 70% and a tp value of (essentially) 100%, the third device light may be (essentially) s-polarized, and the first polarization redirection optics may be configured to: (a) direct p-polarized first and second device light towards the diffuser, (b) direct 30% of s-polarized first and second device light towards the diffuser, (c) direct 70% of s-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 specific embodiments, the first polarization based redirection optical element may have a transmittance for p-polarized device light of at least 80%, such as at least 90%, especially at least 95%, including essentially 100%. In such embodiments, the first polarization based redirection optical element may especially have at most 25% reflectance for p-polarized light, such as at most 15%, like at most 5%. Especially, in embodiments, the first polarization based redirection optical element may have little to no reflectance for p- polarized light. Further, in specific embodiments, the first polarization based redirection optical element may have a transmittance for s-polarized device light selected from the range of 15-80%, such as from the range of 20-80%, like from the range of 25-75%, especially from the range of 30-70%. Such embodiments may especially apply for device light having at least one of the first centroid wavelength (λc1) and the second centroid wavelength (λc2). Moreover, in such embodiments, the third device light may comprise (such as essentially consist of) s-polarized light. Additionally or alternatively, in such embodiments, the first device light and the second device light may comprise linear polarized light having the same linear polarizations. Hence, in embodiments, the first polarization based redirection optical element has a transmittance for p-polarized device light of at least 90%, and a transmittance for s-polarized device light selected from the range of 20-80% for at least one of λc2 and λc1; wherein the third device light comprises (such as essentially consists of) s-polarized light; and 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. 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 2024PF80205 29 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 providedevice light having a centroid wavelength in the range of λc1 – λc2, and may have a centroidwavelength and / or polarization selected such that the additional device light may becombined with the first, second, and third device light through further multichroic and / orpolarization multiplexing. In embodiments, the light generating system thus comprises a polarization control system. The polarization control system may be configured to control a polarizationof (at least part of) the device light propagating from the first multichroic based redirectionoptical element to the first polarization based redirection optical element. In embodiments,the polarization control system may be configured to control a polarization of the first device light (as provided to the first polarization based redirection optical element). 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 based redirection optical element). Control of the polarization of one of the first device light and the second device light may provide a more stable output of the light generating system, and may, for instance, be considered when ts (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 based redirection optical element, such as between the first lightgenerating device and the first multichroic based redirection optical element, or such asbetween the first multichroic based redirection optical element and the first polarizationbased redirection optical element. 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 based redirection optical element, such as between the second light generating device and the firstmultichroic based redirection optical element, or such as between the first multichroic basedredirection optical element and the first polarization based redirection optical element. 2024PF80205 30 Alternatively or additionally, in embodiments, the polarization rotator may be configured in the optical path of the third device light, especially between the third light generating device and the first polarization based redirection optical element. The polarization rotator may thusbe configured to control a polarization of one or more of the first, second and third devicelight, especially of both of the first and second device light, or especially of the third device light. In particular, in embodiments, the polarization rotator may especially be configuredbetween (relative to the propagation of light through the system) the first multichroic basedredirection optical element and the first polarization based redirection optical element.Hence, in embodiments, the polarization control system may comprise a polarization rotatorconfigured downstream of the first multichroic based redirection optical element andupstream of the first polarization based redirection optical element, wherein the first device light and the second device light reaching the first polarization based redirection optical element 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. 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 becontrolled. Hence, in embodiments, the control system (see above), may be configured tocontrol 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 based redirection optical element. Especially, in embodiments, the polarization control system may be configured to control rotation of the 2024PF80205 31 birefringent rotator, such that the polarization of the device light reaching the firstpolarization based redirection optical element is adjusted. The birefringent rotator maytherefore, 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 based redirection optical element, 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 based redirection optical element, 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 based redirection optical element. 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 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 basedredirection optical element may alternatively (or additionally) be controlled by controlling anorientation of the light generating devices, especially by controlling an orientation of one ofthe first light generating device and the second light generating device. Additionally oralternatively, in embodiments, the polarization of the device light received by the first polarization based redirection optical element may be controlled by controlling an orientation of the third 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 generatingdevice relative to the first multichroic based redirection optical element, especially arotational orientation around a (first) optical axis of the first device light, (ii) an (rotational)orientation of the second device relative to the first multichroic based redirection opticalelement, especially a rotational orientation around a (second) optical axis of the second device light, and (iii) an (rotational) orientation of the third device relative to the first polarization based redirection optical element, especially a rotational orientation around a (third) optical axis of the third device light. In particular, in embodiments, the control system may be configured to (control the polarization control system to) control the spectral power 2024PF80205 32 distribution of the system light by controlling one or more of (i) an orientation of the firstlight generating device relative to the first multichroic based redirection optical element, (ii)an orientation of the second device relative to the first multichroic based redirection opticalelement, and (iii) an orientation of the third device relative to the first polarization based redirection optical element. In particular, in embodiments, the light generating system, especially the polarization control system, may comprise a movement element, especially a rotationalelement. The rotational element may comprise the first light generating device and / or thesecond light generating device, especially the first light generating device and the second light generating device. The rotational element may be configured to control a rotationalorientation of the light generating device(s) relative to the first multichroic based redirectionoptical element. 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 multichroic based redirection optical element(and by the first polarization based redirection optical element). 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 multichroic basedredirection optical element (together) relative to the first polarization based redirectionoptical element. Especially, in such embodiments, the rotational element may be configuredto control a rotational orientation around an optical axis of a combined (first and second) device light emitted from the first multichroic based redirection optical element in an opticalpath towards to first polarization based redirection optical element. Furthermore, the controlsystem may, in embodiments, be configured to control the rotational element. In further embodiments, the movement element, especially the rotational element, may comprise (or “host”) at least the first light generating device. In such embodiments, the movement element may be configured to control (at least) a polarization of the first device light received by the first multichroic based redirection optical element. 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 multichroic based redirection optical element. In further embodiments, the movement element, especially the rotational element, may comprise (or “host”) the first light generating device and the second light 2024PF80205 33 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 based redirection optical element. In further embodiments, the rotational element may further comprise the first multichroic based redirection optical element. 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 multichroic based redirection optical element, 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 firstpolarization based redirection optical element.In further embodiments, the polarization control system may comprise one ormore movement devices, such as an actuator, configured to one or more of (i) rotate the firstlight 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 based redirection optical element. Especially, in embodiments, the polarization control system may be configured such that of combined first and second device light traveling from the firstmultichroic based redirection optical element and received by the first polarization basedredirection optical element, 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 based redirection optical element 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 based redirection optical element comprises (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. Further, in embodiments, the diffuser arrangement may be configured as a collinear arrangement. In such 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 2024PF80205 34 embodiments reflection). In such embodiments, device light, which may substantially not be diffused, propagating to the diffuser arrangement may propagate at least part of its opticalpath via a same optical path as diffused device light (i.e. device light having been diffused atthe diffuser and propagating away from the diffuser. To separate these two types of light that may have essentially the same spectral power distributions, but may only differ in extent of diffusion (i.e. beam angle), a retarder may be applied in combination with a (second) polarization based redirecting optical element. Hence, in embodiments, the diffuser arrangement may comprise a λ / 4 waveplate. 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 λ / 4 waveplate may especially be configured between (relative to the propagation of light through the system) the (second) polarization based redirection optical element and the diffuser. In embodiments, the second polarization based redirection optical element may thus be configured to direct (first, second and / or third) device light received by the second polarization based redirection optical element and comprising (either) the first linear polarization or the second linear polarization (optionally via optics) to the λ / 4 waveplate. The λ / 4 waveplate may, in embodiments, be configured to convert (first, second and / or third) device light received by the λ / 4 waveplate comprising a linear polarization into (first, second and / or third) device light having a (first) circular polarization. At the diffuser, in embodiments, the (first, second and / or third) device light having the (first) circular polarization may be diffused into diffused device light having 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) circular polarization into diffused device light comprising a linearpolarization. For example, in embodiments, p-polarized (first, second, and or third) devicelight may be directed by the second polarization based redirection optical element to the λ / 4 waveplate. In such embodiments, the λ / 4 waveplate may be configured to convert the p- polarized (first, second and / or third) device light into left-handed circularly polarized (first, second and / or third) device light. Further, in such embodiments, the diffuser may beconfigured to diffuse the left-handed circularly polarized (first, second and / or third) devicelight received by the diffuser into right-handed circularly polarized diffused device light. The 2024PF80205 35 λ / 4 waveplate may then, in embodiments, be configured to convert the right-handed circularly polarized diffused device light received by the λ / 4 waveplate (back) to linearly polarized light, especially to s-polarized diffused device light. However, in embodiments, different polarizations and conversions from the example described here may be possible too, such as e.g. starting from s-polarized (first, second and / or third) device light, and / or configuring the λ / 4 waveplate to convert the non-diffused p-polarized device light into right-handed circularly polarized device light.. Hence, in embodiments (where the luminescentmaterial and the diffuser may both be configured in the reflective mode;) the diffuser maycomprise a polarization maintaining diffuser, and wherein the diffuser arrangement may further comprise a λ / 4 waveplate configured between the second polarization based redirection optical element and the diffuser, wherein the second polarization based redirection optical element may be configured to direct (first, second and / or third) devicelight received by the second polarization based redirection optical element (and comprisingthe first linear polarization or the second linear polarization) (optionally via optics) to the λ / 4waveplate, wherein the λ / 4 waveplate may be configured to (i) convert (first, second and / orthird) device light received by the λ / 4 waveplate (and comprising a linear polarization) into(first, second and / or third) device light having a (first) elliptical (such as especially circular) polarization, and (ii) convert diffused device light received by the λ / 4 waveplate (via thediffuser) and comprising a (second) elliptical (such as especially circular) polarization intodiffused device light comprising a linear polarization. Furthermore, in embodiments, the diffuser arrangement 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 intensity (in units W / sr) 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. Further, in embodiments wherein a collinear (reflective) diffuser arrangement is applied, the optics may thus (further) comprise a second polarization based redirectionoptical element. The second polarization based redirection optical element may be configuredto direct device light comprising a first linear polarization in an optical path to the diffuser 2024PF80205 36 arrangement, and direct (returning) diffused device comprising a second linear polarization (complementary to the first linear polarization) in an optical path to the light exit. The second polarization based redirection optical element may especially be configured in an optical path between the first polarization based redirection optical element and the diffuser arrangement. Additionally, in embodiments, the second polarization based redirection optical element may be configured in an optical path between the diffuser arrangement and the second multichroic based redirection optical element. Hence, in embodiments, the second polarization based redirection optical element may be configured (in an operational mode of the light generating system) in a light-receiving relationship with (both) the first polarization based redirection optical element and the diffuser arrangement. In specific embodiments, the second multichroic based redirection optical element (DBS2) may be configured downstream of both the first polarization based redirection optical element (PPBS1) and the second polarization based redirection opticalelement (PBS2). Hence, in such embodiments, the second multichroic based redirectionoptical element may be configured to combine the luminescent material light and the diffuseddevice light into a same optical path to the light exit. Alternatively, in specific embodiments,the second polarization based redirection optical element (PBS2) may be configured downstream of both the first polarization based redirection optical element (PPBS1) and the second multichroic based redirection optical element (DBS2), while the second polarization based redirection optical element (PBS2) may be transmissive for the luminescent material light. Hence, in such embodiments, the second polarization based redirection optical element may be configured to combine the luminescent material light and the diffused device light into a same optical path to the light exit. The light generating system, especially the optics, may thus comprise thesecond polarization based redirection optical element, especially a second polarizing beamsplitter. The second polarization based redirection optical element may especially beconfigured to (A) direct (linearly polarized) device light received (directly or indirectly) bythe second polarization based redirection optical element (via the first polarization basedredirection optical element) to the diffuser arrangement and (B) direct the (linearly polarized)diffused device light received from the diffuser arrangement in an optical path to the lightexit. In particular, as described above, the diffuser arrangement may be configured to ‘flip’ apolarization state of the received device light, i.e., if p-polarized device light is provided to the diffuser arrangement, the diffused device light received by the second polarizing beamsplitter may be s-polarized device light, and vice versa. 2024PF80205 37 In embodiments, the second polarization based redirection optical elementmay, especially with 45° irradiation with the device light, be (A) at least 80%, such as at least90%, 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). Similarly, in embodiments, the second multichroic based redirection optical element may, especially with 45° irradiation with the light, be (A) at least 80%, such as at least 90%, especially at least 95% transmissive for one of (i) device light and (ii) luminescent material light; and (B) at least 80%, such as at least 90%, especially at least 95% reflective for the other one of (a) device light and (b) luminescent material light. For instance, in embodiments, the second multichroic redirection optics may be at least 90% transmissive for device light (or for luminescent material light) and at least 90% reflective for luminescent material light (or for device light). In embodiments, the light generating system may further comprise a (second) λ / 2 waveplate, to which essentially the same embodiments may apply as described above. In embodiments, the (second) λ / 2 waveplate may be configured in an optical path between (a) the first polarization based redirection optical element and (b) the second polarization based redirection optical element. Hence as such, a linearly polarized beam of device light (received by the (second) λ / 2 waveplate from the first polarization based redirection opticalelement) may thus be adjusted by the (second) λ / 2 waveplate such that a beam of device lightcomprising any ratio of p / (s+p) and s / (s+p) may be provided to the second polarization based redirection optical element, 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 second polarization based redirection optical element. Hence, in embodiments, the light generating system may further comprise a (second) λ / 2 waveplate configured in an optical path between the first polarization based redirection optical element and the second polarization based redirection optical element. The diffuser arrangement may comprise a reflective diffuser arrangement or a transmissive diffuser arrangement. When the diffuser arrangement comprises a reflective diffuser arrangement, the diffuser arrangement may comprise a collinear diffuser arrangement or a non-collinear diffuser arrangement. A transmissive diffuser arrangement 2024PF80205 38 may imply less optics or less complicated optics. A reflective diffuser arrangement may be useful for safety reasons. Embodiments will be described below. Note that both a transmissive diffuser arrangement and a non-collinear reflective diffuser arrangement may not require additional polarizing optics (PBS2) to split diffused light from incoming non- diffused light, and therefore may prevent depolarization losses that may occur with collinear reflective diffuser arrangements. Further, this may thus result in lower parts count, a smaller system volume, and lower cost. Collinear reflective diffusers and transmissive diffusers may show more ideal imaging properties for the further downstream optical system than non- collinear reflective diffusers, and therefore may result in better uniformity. In specific embodiments, the diffuser may be configured in the reflective mode, wherein the diffuser arrangement may be configured such that an optical axis of the device light reaching the diffuser and an optical axis of the diffused device light reflecting from the diffuser may be co-axial (or collinear, see also further above). Hence, in such embodiments, the diffuser may be configured in the reflective mode, such that the optical axis (Oi) of incoming device light and the optical axis (Or) of outgoing diffused device light (relative to the diffuser) may have a parallel direction relative to each other. In other words, in such embodiments, the diffuser may be configured such that a direction of incoming device light and a direction of outgoing diffused device light (relative to the diffuser) may be opposite or antiparallel. Especially, in such embodiments, the diffuser may be configured such that an optical axis of incoming device light and an optical axis of outgoing diffused device light (relative to the diffuser) may be parallel or collinear. In alternative embodiments, the diffuser may be configured in the reflective mode, wherein the diffuser arrangement may be configured such that an optical axis of the device light reaching the diffuser and an optical axis of the diffused device light reflecting from the diffuser may not be co-axial (or non-collinear, as described above). Hence, in such embodiments, the diffuser arrangement may thus comprise a non-collinear diffuser arrangement, wherein the diffuser may be configured in a reflective mode, such that the optical axis (Oi) of incoming device light and the optical axis (Or) of outgoing diffused device light (relative to the diffuser) may have an orthogonal direction relative to each other. In such embodiments, an optical axis of incoming light may have a non-zero angle with a normal to the surface of the diffuser. Especially, a reflected beam of light may (then) also have a non-zero angle with the normal. In such embodiments, maintenance of (linear) polarization may not be necessary (as is especially the case in the collinear configuration). Hence, in embodiments the diffuser arrangement may be configured as non-collinear 2024PF80205 39 arrangement. Especially, in (such) embodiments the light generating system may be configured such that incoming light, comprising (two or more of first, second, and third) device light, on the diffuser, has an optical axis (Oi) having a first angle (αi) with a normal to the diffuser unequal to 0°, and wherein outgoing diffused device light has an optical axis (Oo), having a second angle (αo) relative to the normal to the diffuser unequal to 0°, wherein the optical axes (Oi,Oo) may have a mutual angle (β) unequal to 0°. For instance, the mutual angle (β) may e.g. be selected from the range of 60-120 °, such as about 90°. However, other mutual angles (β) may also be possible. Hence, in embodiments, the diffuser arrangement is configured in the reflective mode, wherein the diffuser arrangement is configured as non- collinear arrangement; wherein the light generating system is configured such that an optical axis (Oi) of incoming device light relative to the normal to the diffuser and an optical axis (Or) of outgoing diffused device light relative to the normal to the diffuser have a mutual angle (β) unequal to 0°. Further, as indicated below, in embodiments a fourth light generating device (and optional further light generating devices) may be comprised by the system. Light of one or more of such devices, may be received by the diffuser arrangement, in dependence of the arrangement of such light generating device and the (controllable) settings of the system; see further also below. Also for the fourth device light (and optional further light generating devices) may apply that there may be a fixed ratio between the radiant flux of their respective device light propagating to the diffuser arrangement and the luminescent material, as they, when present, are configured upstream of the first polarization based redirection optical element. Hence, in embodiments, the light generating system may further comprise a fourth light generating device. General embodiments in relation to light generating devices are described elsewhere herein (see e.g. also above). For the sake of completeness, however, especially the fourth light generating device may be configured to generate fourth device light and in specific embodiments the fourth light generating device may comprise one ormore of a laser diode, a superluminescent diode, and a stacked multi-junction light-emittingdiode. Especially, in embodiments, the fourth light generating device may comprise a fourth laser bank comprising a plurality of fourth lasers. Further, as indicated above, the fourth light generating device may be selected such that at least part of its fourth device light may be converted by the luminescent material.Hence, in specific embodiments, the fourth device light may have spectral power in thewavelength range of 380-490 nm, especially selected from the wavelength range of 430-490 2024PF80205 40 nm. For instance, though not exclusively, the fourth device light may have a fourth centroid wavelength (λc4) selected from the wavelength range of 380-490 nm, especially selected from the wavelength range of 430-490 nm. Especially, the fourth device light may be admixed with the first (and / or second) device light (or, alternatively, admixed with the third devicelight) via a third multichroic based redirection optical element. Hence, in embodiments, |λc4-λc1|≥ 5 nm, such as |λc4- λc1|≥ 10 nm, like in specific embodiments |λc4- λc1|≥ 15 nm, moreespecially |λc4- λc1|≥ 20 nm. In specific embodiments, the fourth device light may have afourth centroid wavelength (λc4) selected from the wavelength range of (380-490 nm, more especially selected from the wavelength range of) 430-490 nm and / or the first device light may have a first centroid wavelength (λc1) selected from the wavelength range of 430-490 nm, and wherein especially |λc4-λc1| ≥ 10 nm applies. Additionally or alternatively, inembodiments, |λc4-λc2|≥ 5 nm, such as |λc4- λc2|≥ 10 nm, like in specific embodiments |λc4-λc2|≥ 15 nm, more especially |λc4- λc2|≥ 20 nm. In specific embodiments, the fourth devicelight may have a fourth centroid wavelength (λc4) selected from the wavelength range of (380-490 nm, more especially selected from the wavelength range of) 430-490 nm and / or the second device light may have a second centroid wavelength (λc2) selected from the wavelength range of 430-490 nm, and wherein especially |λc4-λc2| ≥ 10 nm applies. Yetadditionally or alternatively, |λc4-λc3|≥ 5 nm, such as |λc4- λc3|≥ 10 nm, like in specificembodiments |λc4- λc3|≥ 15 nm, more especially |λc4- λc3|≥ 20 nm. In specific embodiments,the fourth device light may have a fourth centroid wavelength (λc4) selected from the wavelength range of (380-490 nm, more especially selected from the wavelength range of) 430-490 nm and / or the third device light may have a third centroid wavelength (λc3) selected from the wavelength range of 430-490 nm, and wherein especially |λc4-λc3| ≥ 10 nm applies.In some embodiments, the fourth device light may have a fourth centroid wavelength (λc4)selected from the wavelength range of ≥490 nm, such as especially from the range of 490-780 nm. For example, in embodiments, the fourth device light may be red light. Hence, in embodiments, the system may (further) comprise a fourth lightgenerating device. Moreover, in such embodiments, the system may (further) comprise anadditional redirection optical element comprising one of a third multichroic based redirectionoptical element and a third polarization based redirection optical element. The additional redirection optical element may, in embodiments, be configured in an optical path between the fourth light generating device and the diffuser arrangement. Additionally, in embodiments, the additional redirection optical element may be configured in an optical path between the first polarization based redirection optical 2024PF80205 41 element and the diffuser arrangement. Hence, in embodiments, the additional redirection optical element may be configured to receive (i) one or more of first device light, second device light, and third device light from the first polarization based redirection optical element, and (ii) fourth device light from the fourth light generating device. The additional redirection optical element may, in such embodiments, be configured to direct (such as transmit and / or reflect) the device light received by the additional redirection optical element to the diffuser assembly. The additional redirection optical element may especially transmit or reflect the device light received by the additional redirection optical element in dependence of its respective spectral power distribution. Hence, in embodiments, the additional redirection optical element may comprise a third multichroic based redirection optical element. Especially, in such embodiments, (especially where the diffuser arrangement comprises a collinear reflective diffuser arrangement) the third multichroic based redirection optical element may be configured to combine fourth device light received by the additional redirection optical element and two or more of first device light, second device light and third device light received by the additional redirection optical element in an optical path to thediffuser arrangement in dependence of their spectral power distribution. Note that, in suchembodiments, a polarization of the fourth device light may especially be the same (linear) polarization as the polarization of the (two or more of) first device light, second device light and third device light with which it may be combined at the additional redirection optical element. Alternatively, in embodiments where the diffuser arrangement comprises a non-collinear reflective diffuser arrangement or a transmissive diffuser arrangement, the additional redirection optical element may comprise a third polarization based redirection optical element. In such embodiments, the third polarization based redirection optical element may be configured to combine fourth device light received by the additional redirection optical element and two or more of first device light, second device light and third device light received by the additional redirection optical element in an optical path to thediffuser arrangement in dependence of their polarizations. Note that, in such embodiments, apolarization of the fourth device light may especially be an orthogonal (linear) polarization relative to the polarization of the (two or more of) first device light, second device light and third device light with which it may be combined at the additional redirection optical element. 2024PF80205 42 Yet, further in embodiments the second multichroic based redirection opticalelement may be configured to direct (i) luminescent material light (which in specific embodiments in an operational mode may thus be generated by the first device light, the second device light and the third device light), received by the second multichroic basedredirection optical element, and (ii) diffused device light (which in specific embodiments inan operational mode may thus comprise diffused first device light, diffused second devicelight, diffused third device light, and diffused fourth device), received by the secondmultichroic based redirection optical element, in an (mutual) optical path to the light exit.Hence, in embodiments the system light in an operational mode of the light generating system may comprise at least part of the luminescent material light (which in specific embodiments in an operational mode may thus be generated by the first device light, the second device light and the third device light) and at least part of the diffused device light (which in specific embodiments in an operational mode may thus comprise diffused first device light, diffused second device light, diffused third device light, and diffused fourth device), and may have in specific embodiments a correlated color temperature selected from the range of 1800-12000 K and a CRI selected from the range of at least 65. As indicated above, in embodiments the spectral power distribution of the system light may be controllable. In embodiments, the control system may be configured to control the spectral power distribution of the system light by controlling one or more of (a) a rotation of the birefringent rotator and (b) one or more of the first light generating device, thesecond light generating device, the third light generating device, and the fourth lightgenerating device (i.e. the respective radiant flux(es)), and (c) one or more of a rotational position of the first light generating device, the second light generating device, the third lightgenerating device, and the fourth light generating device. Herein, rotational positions of lightgenerating devices especially refer to a rotation (of the light generating device) about the optical axis of the light emitted by the respective light generating device towards to thedownstream configured polarization based redirection optical element.Hence, in some embodiments, the fourth device light may comprise linear polarized light. Hence, in embodiments the light generating system may be configured suchthat (a) the third polarization based redirection optical element is configured in a light-receiving relationship with the fourth light generating device, and (b) the fourth device lightreceived by the third polarization based redirection optical element comprises linearpolarized light. 2024PF80205 43 Hence, in specific embodiments, the light generating system may further comprise a fourth light generating device and an additional redirection optical element comprising one of a third multichroic based redirection optical element (DBS3) and a third polarization based redirection optical element (PBS3); wherein: (A) the fourth light generating device is configured to generate fourth device light having a fourth centroid wavelength (λc4); wherein the fourth light generating device comprises one or more of a laser diode, a superluminescent diode, and a stacked multi-junction light-emitting diode; (B) the additional redirection optical element is configured in an optical path between the fourth light generating device and the diffuser arrangement and in an optical path between the first polarization based redirection optical element (PPBS1) and the diffuser arrangement; and (C) one of the following applies: (i) (two or more of the following apply: |λc1-λc4|≥5 nm, |λc2- λc4|≥5 nm, |λc3-λc4|≥5 nm and) the additional redirection optical element comprises a third multichroic based redirection optical element (DBS3) configured to combine fourth device light received by the additional redirection optical element and two or more of first device light, second device light and third device light received by the additional redirection optical element in an optical path to the diffuser arrangement in dependence of their spectral power distribution; or (ii) the diffuser arrangement comprises the non-collinear arrangement (or a transmissive diffuser arrangement) and the additional redirection optical element comprises a third polarization based redirection optical element (PBS3) configured to combine fourth device light received by the additional redirection optical element and two or more of first device light, second device light and third device light received by the additional redirection optical element in an optical path to the diffuser arrangement in dependence of their polarizations. 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 opticsmay comprise an integrator, like a “Koehler integrator” (or “Köhler integrator”). In specificembodiments, the optics may comprise one or more of an integrating (or “homogenizing”) 2024PF80205 44 optics, collimating optics, condensing optics, and reflecting optics. For example, in embodiments, the luminescent material light and the diffused laser light may be provided(e.g. by the second multichroic based redirection optical element or the second polarizationbased redirection optical element as defined above) along the same optical path to the lightexit, 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 mayespecially be configured between (relative to the propagation of light through the system) thelight generating devices (contributing to irradiation of the luminescent material) and(collimating optics of) the luminescent material. Similarly, in embodiments, homogenizingoptics may be configured between (relative to the propagation of light through the system) the light generating devices (contributing to irradiation of the diffuser) and (collimatingoptics of) the diffuser. In further embodiments, the homogenizing optics may e.g. compriseone 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). 2024PF80205 45 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 specificembodiments (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 opticsmay 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 2024PF80205 46 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 maycomprise 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 A3B5O12 garnets, 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 A3B5O12 wherein in specific embodiments at maximum 10% of B-O may be replaced by Si-N. 2024PF80205 47 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 2024PF80205 48 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 2024PF80205 49 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. 2024PF80205 50 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 (ordisk) or a rotating rod (or cylinder). Such embodiments may enable thermal spreading andcooling 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. 2024PF80205 51 In embodiments, the luminescent material may herein especially be configured in the reflective mode. In the reflective mode, thermal management may be easier, as a substantial part of the luminescent material may be in thermal contact with a thermally conductive element, like a heatsink or heat spreader. Hence, would any device light escape from the system, in embodiments this may only via transmission through the luminescent material. Alternatively, in embodiments, the luminescent material may be configured in the transmissive mode. In the transmissive mode, it may be relatively easy to have light source light admixed in the luminescent material light, which may be useful for generating the desirable spectral power distribution. In specific embodiments, the invention may provide a light generating system comprising a first light generating device, a second light generating device, a third light generating device, a luminescent material, a control system, optics, a diffuser arrangement, and a light exit; wherein: (A) the light generating devices comprise solid-state light source selected from the group of diode lasers, superluminescent diodes, and multi-junction diodes; wherein (i) the first light generating device is configured to provide first device light having a first centroid wavelength (λc1), (ii) the second light generating device is configured to provide second device light having a second centroid wavelength (λc2), and (iii) the third light generating device is configured to provide third device light having a third centroid wavelength (λc3); wherein the first centroid wavelength (λc1), the second centroid wavelength (λc2), and the third centroid wavelength (λc3) are individually selected from the wavelength range of 380-780 nm; wherein |λc1-λc2| ≥ 5 nm; (B) the optics comprise redirection optical elements; wherein the redirection optical elements comprise a polarization based redirection optical element (PPBS1) and multichroic based redirection optical elements (DBS1,DBS2); (C) a first multichroic based redirection optical element (DBS1) selected from the optics is (i) configured in a light-receiving relationship with the first light generating device and the second light generating device and is (ii) configured to combine first device light and second device light received by the first multichroic based redirection optical element (DBS1); (D) a first polarization based redirection optical element (PPBS1) selected from the optics is configured in a light-receiving relationship with (a) the first multichroic based redirection optical element (DBS1) and (b) the third light generating device, wherein the first polarization based redirection optical element (PPBS1) is (i) at least partly transmissive for p-polarized device light, and (ii) at least partly reflective and at least partly transmissive for s-polarized device light; wherein the first polarization based redirection optical element (PPBS1) is configured to direct device light received by the first 2024PF80205 52 polarization based redirection optical elements (PPBS1), in dependence of its polarization, in one or more of (a) an optical path to the luminescent material and (b) an optical path to thediffuser arrangement; (E) the luminescent material is configured to convert at least part of thedevice light received by the luminescent material from at least one of the light generating devices into luminescent material light, wherein the luminescent material is configured in the transmissive mode: (F) the diffuser arrangement comprises a diffuser; wherein the diffuser arrangement is configured to diffuse at least part of the device light received by the diffuser arrangement from at least one of the light generating devices into diffused device light; (G) at least one of the redirection optical elements is configured to direct (i) diffused device light received by the optics from the diffuser arrangement and (ii) luminescent material light received by the optics from the luminescent material in an optical path to the light exit; (H) the light generating system is configured such that in an operational mode of the light generating system the first device light, the second device light, and the third device light received by the first polarization based redirection optical element (PPBS1) comprise linear polarized light; (I) the light generating system is configured to provide, via the light exit, system light; wherein the control system is configured to control the system light; wherein in an operational mode of the light generating system the system light comprises one or more ofat least part of the luminescent material light and at least part of the diffused device light.In embodiments, a second multichroic based redirection optical element may be configured downstream of (and thus in a light-receiving relationship with) both the luminescent material and the diffuser assembly. In such embodiments, the second multichroic based redirection optical element may be configured to combine the luminescent material light received from the luminescent material and the diffused device light received from the diffuser assembly in a same optical path to the light exit. Therefore, the second multichroic based redirection optical element may especially be configured to (i) (substantially) transmit the luminescent material light and (substantially) reflect the diffused device light, or (ii) (substantially) reflect the luminescent material light and (substantially) transmit the diffused device light. Alternatively, in embodiments, the second multichroic based redirection optical element may be configured downstream of (and thus in a light-receiving relationship with) the luminescent material, whereas the second polarization based redirection optical element may be configured downstream of (and thus in a light-receiving relationship with) both the luminescent material (via the second multichroic based redirection optical element) and the diffuser assembly. In such embodiments, the second polarization based redirection 2024PF80205 53 optical element may be configured to combine the luminescent material light received from the luminescent material (via the second multichroic based redirection optical element) and the diffused device light received from the diffuser assembly in a same optical path to the light exit. Therefore, the second polarization based redirection optical element may especially be configured to (i) (substantially) transmit the luminescent material light and (substantially) reflect the diffused device light, or (ii) (substantially) reflect the luminescent material light and (substantially) transmit the diffused device light. Especially, in embodiments, the second polarization based redirection optical element may especially be configured to be (substantially) transmissive for the luminescent material light. Additionally, in such embodiments, the second polarization based redirection optical element may be configured to transmit or reflect (diffused) device light in dependence of its polarization. Yet alternatively, in embodiments, the second polarization based redirection optical element may be configured downstream of (and thus in a light-receiving relationship with) both the luminescent material and the diffuser assembly. In such embodiments, the second polarization based redirection optical element may be configured to combine the luminescent material light received from the luminescent material and the diffused device light received from the diffuser assembly in a same optical path to the light exit. Therefore, the second polarization based redirection optical element may especially be configured to (i) (substantially) transmit the luminescent material light and (substantially) reflect the diffused device light, or (ii) (substantially) reflect the luminescent material light and (substantially) transmit the diffused device light. Especially, in embodiments, the second polarization based redirection optical element may especially be configured to be (substantially) transmissivefor the luminescent material light. Additionally, in such embodiments, the secondpolarization based redirection optical element may be configured to transmit or reflect (diffused) device light in dependence of its polarization. Hence, in such embodiments, essentially no second multichroic based redirection optical element may be required. 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 2024PF80205 54 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 (ordifferent)) light sources, such as 2-2000 solid state light sources (such as LEDs or laserdiodes (or “diode lasers”)).Hence, the term LED may also refer to a plurality of LEDs. Inembodiments, 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 alaser 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 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 alaser diode (or diode laser). In embodiments, the terms “laser” or “solid state laser” or “solidstate 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, 2024PF80205 55 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 embodimentscomprise 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 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 2024PF80205 56 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. 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 terms “orange light” or “orange emission” especially relate to light having a wavelength in the range of about 590- 620 nm. The terms “red light” or “red emission” especially relate to light having a wavelength in the range of about 620-780 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. 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 2024PF80205 57 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 comprisingthe light generating system as defined herein. Especially, a projection device or “projector”or “image projector” may be an optical device that projects an image (or moving images) onto a surface, such as e.g. a projection screen. The projection 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. officelighting 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 lightingsystems, horticulture lighting, digital projection, or LCD backlighting. The light generatingsystem (or luminaire) may be part of or may be applied in e.g. optical communicationsystems or disinfection systems. The light source(s) may during operation especially emit (light source light) atleast 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, thelight 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 2024PF80205 58 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 fromthe range of 780-3000 nm, such as 780-2000 nm, e.g. a wavelength up to about 1500 nm, likea 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. 1-5 schematically depict embodiments of the light generating system;Fig. 6 schematically depicts an embodiment of the lighting device.The schematic drawings are not necessarily to scale. DETAILED DESCRIPTION OF THE EMBODIMENTS Fig. 1-5 schematically depict embodiments of light generating systems 1000.In the depicted embodiments, the light generating system 1000 comprises three lightgenerating devices 110,120,130, a luminescent material 200, a control system 300, optics500, a diffuser arrangement 700, and a light exit 1090. In particular, each of the light 2024PF80205 59 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, a first light generating device 110 comprises a first laser bank comprising a plurality of first solid-state light sources 10, especially first lasers. The first solid-state light sources 10 maybe configured to generate first device light 11. Similarly, in embodiments, a second lightgenerating device 120 comprises a second laser bank comprising a plurality of second solid- state light sources 20, especially second lasers. The second solid-state light sources 20 maybe configured to generate second device light 21.Yet similarly, in embodiments, a third lightgenerating device 130 comprises a third laser bank comprising a plurality of third solid-statelight sources 30, especially third lasers. The third solid-state light sources 30 may beconfigured to generate third device light 31.In specific embodiments, the light generating devices 110,120,130 may be configured to operate at rated forward currents. 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 λc2 and 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 wavelength λc2may differ, especially differ by at least2 nm, such as at least 5 nm. Especially, the first centroid wavelength λc1 and the secondcentroid wavelengths λc2 may differ sufficiently for a first multichroic based redirectionoptical element DBS1, such as a first dichroic beam splitter, to combine the first device light101 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 consistenteffect of a second multichroic based redirection optical element DBS2 (see also furtherbelow) and the luminescent material 200 with respect to the first, second and third devicelight 111,121,131, it may be particularly convenient for the third device light 131 to have a third central wavelength λc3 selected from the range of the central wavelengths of the first and second device light 111,121. Hence, in embodiments, λc1≤ λc3≤ λc2or λc2≤ ≤ 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 viathe diffuser arrangement 700, especially via the diffuser 710. Hence, in embodiments, theluminescent material 200 may be configured to convert at least part of the device light 2024PF80205 60received by the luminescent material 200 into luminescent material light 201. As depicted inFigs. 1-4, in embodiments, the diffuser arrangement 700 comprises an arrangement of apolarization converter 720 and a diffuser 710; wherein the diffuser arrangement 700 isconfigured to diffuse at least part of the device light received by the diffuser arrangement 700into diffused device light 711. Especially, in such embodiments, the diffuser arrangement 700 is configured as collinear arrangement. In such embodiments, incoming device light comprising two or more of first device light 111, second device light 121, and third device light 131, received by the diffuser arrangement 700, propagates over at least part of its optical path collinear with an optical path of the diffused device light 711 propagating from the diffuser arrangement 700 to the light exit 1090. The optics 500 may therefore further comprise a second polarization based redirection optical element PBS2 configured in an optical path between the first polarization based redirection optical element PPBS1 and the diffuser arrangement 700. The second polarization based redirection optical element PBS2may especially be configured to (i) direct device light, received by the second polarizationbased redirection optical element PBS2 (via the first polarization based redirection opticalelement PPBS1), to the diffuser arrangement 700, and (ii) direct diffused device light 711 received from the diffuser arrangement 700 in an optical path to the light exit 1090(optionally via the second multichroic based redirection optical element DBS2). Hence, thesecond polarization based redirection optical element PBS2 may be configured to separate the optical paths of the device light and the diffused device light. Moreover, in such embodiments, the diffuser 700 may comprise a polarizationmaintaining diffuser. As indicated above, the diffuser arrangement 700 further comprises aλ / 4 waveplate 720. The λ / 4 waveplate 720 may be configured between the secondpolarization based redirection optical element PBS2 and the diffuser 710. In embodiments, the second polarization based redirection optical element PBS2 is configured to direct device light, received by the second polarization based redirection optical element PBS2, to the λ / 4waveplate 720. The λ / 4 waveplate 720 may then be configured to convert linear polarizedlight received by the λ / 4 waveplate 720 into elliptical (such as circular) polarized light and to convert elliptical (such as circular) polarized light received by the λ / 4 waveplate 720 into linear polarized light. Fig. 1-5 schematically depict different embodiments varying in thearrangement of the components of the system, particularly with respect to the optics and thepresence and arrangement of a polarization control system 600. For explanatory purposes, theembodiment of Fig.1 will be discussed below in detail, and the embodiments of the 2024PF80205 61 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 compriseredirection optical elements 510, wherein the redirection optical elements 510 comprisepolarization based optical elements PPBS1, PBS2 and multichroic based redirection opticalelements DBS1, DBS2. In particular, in embodiments, the polarization based redirectionoptical elements PPBS1, PBS2 may comprise (A) a first polarization based redirection optical element PPBS1, such as a first polarizing beam splitter, especially a first partialpolarizing beam splitter PPBS1, and (B) a second polarization based redirection opticalelement PBS2, especially a second polarizing beam splitter. In further embodiments, themultichroic based redirection optical elements DBS1, DBS2 may comprise a first multichroicbased redirection optical element DBS1, especially a first dichroic beam splitter, and asecond multichroic based redirection optical element DBS2, especially a second dichroicbeam splitter. In the depicted embodiment, the first multichroic based redirection optical element DBS1 is configured to combine first device light 111 and second device light 121received by the first multichroic based redirection optical element DBS1. For instance, inembodiments, the first multichroic based redirection optical element DBS1 may be (i) at least 90% transmissive for (light having) one of the first centroid wavelength λc1 and 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 reflective for the second centroid wavelength λc2and transmissive for the first centroid wavelength λc1 in the depicted embodiment. Inparticular, in the depicted embodiment, the first multichroic based redirection optical element DBS1 is configured to provide combined first and second device light 111,121 to the firstpolarization based redirection optical element PPBS1 via (at least part of) the polarizationcontrol 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 multichroicbased redirection optical element DBS1 to the first polarization based redirection opticalelement PPBS1. In particular, in the depicted embodiment, the polarization control system600 comprises a polarization rotator 610 configured downstream of the first multichroic based redirection optical element DBS1 and upstream of the first polarization based redirection optical element PPBS1. Hence, in the depicted embodiment the polarization 2024PF80205 62 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 based redirection optical element PPBS1. In particular, in such embodiments, the first device light 111 and the second device light 121 reaching the first polarization based redirection optical element PPBS1 may 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 600may 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 throughthe polarization rotator 610. Especially, the polarization rotator 610 may comprise abirefringent rotator, wherein the birefringent rotator comprises a λ / 2 waveplate (with respect to λc1 and / or λc2, especially with respect to a wavelength in the range of λc1 to λc2), and wherein the polarization control system 600 is configured to control rotation of thebirefringent rotator, especially by controlling the movement element 620.In embodiments, the first device light 111 and the second device light 121reaching the first polarization based redirection optical element PPBS1 may thus compriselinear polarized light. In further embodiments, the third device light 131 reaching the first polarization based redirection optical element PPBS1 may (also) comprise linear polarized light, especially s-polarized device light. In the depicted embodiment, the first polarization based redirection optical element PPBS1 is configured to distribute the received device light 111, 121, 131 towards thesecond multichroic based redirection optical element DBS2 and towards the secondpolarization based redirection optical element PBS2, in both cases via other optical elements,such as via a specular reflector 580 for device light 111,121,131 provided to the secondpolarization based redirection optical element. In particular, the first polarization based redirection optical element 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 based redirection optical element PPBS1 may be configured to direct device light received from thefirst multichroic based redirection optical element DBS1 (and from the third light generatingdevice 130), in dependence of its polarization, to one or more of (a) the luminescent material200 via the second multichroic based redirection optical element DBS2 and (b) the diffuserarrangement 700 via the second polarization based redirection optical element PBS2. Thefirst polarization based redirection optical element PPBS1 may especially be at least partlytransmissive for p-polarized device light, such as at least 90% transmissive for p-polarized 2024PF80205 63 device light, and (ii) at least partly reflective and at least partly transmissive for s-polarized device light. In embodiments, the light generating system 1000 is configured to provide, via the light exit 1090, system light 1001. In an operational mode of the light generating system 1000 the system light 1001 comprises one or more of at least part of the luminescent material light 201 and at least part of the diffused device light 711. In specific embodiments, the first polarization based redirection optical element PPBS1 has a transmittance for p-polarized device light of at least 90%, and a transmittance for s-polarized device light selected from the range of 20-80% for at least oneof λc2 and λc1. Further, in such embodiments, the third device light 131 comprises (such asessentially consists of) s-polarized light and 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. Due to the partial reflectance and partial transmittance of s-polarized device light and the (essentially) complete transmittance for p-polarized device light, the control system 300 may control the proportions of device light provided to the luminescent material 200 and to the diffuser arrangement 700, and thereby the spectral properties of the systemlight 1001, by controlling the polarization control system 600. Table 1 indicates variousdistributions that could be made depending on the transmittance of the first polarizationbased redirection optical element for s-polarized light (different values of ts), assuming – forexplanatory purposes –a transmittance of 100% for p-polarized light (i.e., tp=1) and equaloptical powers provided by the different light generating devices 110, 120, 130: ts tp p1+2 s1+2 s3 Tlum Tdif Tsys0,3 1 0 1 1 1,3 1,7 30,3 1 0,5 0,5 1 2 1 30,3 1 1 0 1 2,7 0,3 30,5 1 0 1 1 1,5 1,5 30,5 1 0,5 0,5 1 2 1 30,5 1 1 0 1 2,5 0,5 30,7 1 0 1 1 1,7 1,3 30,7 1 0,5 0,5 1 2 1 30,7 1 1 0 1 2,3 0,7 3In particular, table 1 indicates: the proportion of s-polarized device light that istransmitted as ts and of p-polarized device light that is transmitted as tp, respectively, whereinthe proportion (relative to the total optical power, i.e., the sum of the p- and s-polarizedcomponents, of the respective device light incident on the PPBS1) of s-polarized device light 2024PF80205 64that is reflected equals 1-ts and of p-polarized device light that is reflected equals and 1-tp,respectively; the proportion of the combined first and second device light 111, 121 that is s-polarized (s1+2) and p-polarized (p1+2); the proportion of the third device light 131 that is s-polarized (s3); 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 assystem light 1001 (Tsys), wherein (for explanatory purposes) no optical losses are assumedand 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 Tlum and Tdif may, 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 a ts of 0.3, the contribution of luminescentmaterial light 201 in the system light 1001 can be set in the range of 1.3 – 2.7 device outputout of a total of 3 device output, i.e., in the range of (about) 43% to 90% of the system light1001. Similarly, for a ts of 0.3, the contribution of diffused device light 711 can be set in therange 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 ts may provide a larger dynamic range than a higher value of ts. A low value of tsmay thus be preferred in applications where a large dynamic range is desired. In embodiments, the first polarizationbased redirection optical element PPBS1 may especially have a transmittance for s-polarizeddevice light (ts) 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 thediffuser arrangement 700 is provided thereto via (at least) the second polarization basedredirection optical element PBS2. The second polarization based redirection optical elementPBS2 is configured to direct device light received from the first polarization basedredirection optical element PPBS1 to the diffuser arrangement 700 and to direct diffuseddevice light 711 (received from the diffuser arrangement 700) to the light exit 1090. Inparticular, as the first polarization based redirection optical element PPBS1 may have atransmittance for p-polarized device light of (essentially) 100%, and as the third device light 2024PF80205 65 131 may be (essentially) s-polarized device light, (essentially) all device light 111,121,131 arriving at the second polarization based redirection optical element PBS2 may be s-polarized. The second polarization based redirection optical element PBS2 may thus (asdepicted in Figs.1 and 4) especially be configured to reflect s-polarized device light 111,121,131, thereby directing (essentially) all device light received from the firstpolarization based redirection optical element PPBS1 towards the diffuser arrangement 700.For instance, in embodiments, the second polarization based redirectionoptical element PBS2 may be at least 90% reflective for one of (i) s-polarized device lightand (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 based redirection optical element 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 arrangement 700 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 arrangement 700. In other words, the diffused device light 711 may (essentially) be p-polarized light, which may be(predominantly) transmitted by the second polarization based redirection optical elementPBS2 towards the light exit 1090, i.e., the polarization based redirection optical element PBS2 may be configured to direct the diffused device light 711 to the light exit 1090,especially via the second multichroic based redirection optical element DBS2.As schematically depicted in Fig.1, the second multichroic based redirectionoptical element DBS2 may be configured to: (a) direct device light received from the firstpolarization based redirection optical element 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 polarizationbased redirection optical element PBS2 to the light exit 1090. In particular, in the depictedembodiment, the second multichroic based redirection optical element DBS2 is configured downstream of both the first polarization based redirection optical element PPBS1 and the second polarization based redirection optical element PBS2. In particular, in the depicted embodiment, the second multichroic based redirection optical element DBS2 may be configured to transmit device light (having a central wavelength λc in the range of λc1-λc2)and to reflect luminescent material light 201. Thereby, as schematically depicted in Fig. 1,the second multichroic based redirection optical element DBS2 may effectively act as a 2024PF80205 66 dichroic beam combiner configured to combine the diffused device light 711 and theluminescent material light 201 to provide system light 1001 from the light exit 1090. Hence,at least one of the redirection optical elements 510 is configured to direct diffused device light 711 received by the optics 500 from the diffuser arrangement 700 in an optical path to the light exit. In embodiments, the second multichroic based redirection optical element 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 atleast part of the diffused device light 711. In particular, in embodiments, the control system300 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 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 based redirection opticalelement PBS2 is configured downstream of the first polarization based redirection opticalelement PPBS1 with a specular reflector 580 configured in an optical path from the firstpolarization based redirection optical element PPBS1 to the second polarization basedredirection optical element PBS2. The specular reflector 650 may essentially reflect thedevice light 111,121,131 without affecting the linear polarization thereof. 2024PF80205 67 Furthermore, in the depicted embodiment, the optics 500 comprise collimation and / 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 (spatial) 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 betweenthe third light source and PPBS1, respectively. Figs. 2 and 3 schematically depict embodiments wherein the secondpolarization based redirection optical element PBS2 is configured downstream of both the first polarization based redirection optical element PPBS1 and the second multichroic basedredirection optical element DBS2. In such embodiments, the second polarization basedredirection optical element PBS2 may (also) be transmissive for the luminescent materiallight 201, especially at least 90% transmissive for the luminescent material light 201. Forinstance, the filter may be a combination of a blue PBS with transmissive properties for longer wavelengths. Fig. 2 schematically depicts an embodiments wherein the second multichroicbased redirection optical element DBS2 is configured to reflect the device light 111,121,131and to transmit the luminescent material light 201. In particular, in such embodiments the second multichroic based redirection optical element DBS2 may be at least 90% reflective for the device light and at least 90% transmissive for the luminescent material light 201. Figs.3 and 5 schematically depict embodiments wherein the polarization rotator 610 is arranged between the second light generating device 120 and the first multichroic based redirection optical element DBS1. For instance, in the embodiment of Fig. 3, 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) thepolarization of the second device light 121. Such embodiments may, for instance, be 2024PF80205 68considered if a relatively low tunability range is required as such system may be more robustwithin the desired tunability range (i.e., requiring higher 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 lightgenerating device. This configuration may have an altered range of blue / yellow ratio in theengine output light relative to the embodiments of Fig.1, 2, and 4. For example, for the configuration depicted in Fig.3 may apply that if the first light generating device 110provides (only) p-polarized light, then: ts = 30% enables selection of Tlum in the range of 2.0 –2.7, and Tdif in the range of 0.3– 1.0; ts = 50% enables selection of Tlum in the range of 2.0 –2.5, and Tdif in the range of 0.5 – 1.0; and ts = 70% enables selection of Tlum in the range of2.0 – 2.3, and Tdif in the range of 0.7 – 1.0. Alternatively or additionally, in furtherembodiments, a polarization rotator 610 may (also) be arranged between the first light generating device 110 and the first multichroic based redirection optical element DBS1. Fig.4 schematically depicts an embodiment wherein the polarization rotator 610 is arranged between the third light generating device 130 and the first multichroic based redirection optical element DBS1. Alternatively, in embodiments the control system 300, especially thepolarization control system 600, may be configured to control the spectral power distributionof the system light 1001 by controlling one or more of (i) a rotational orientation of the firstlight generating device 110 (along an optical axis of the first device light 111) relative to thefirst multichroic based redirection optical element DBS1, (ii) a (rotational) orientation of thesecond light generating device 120 (along an optical axis of the second device light 121) relative to the first multichroic based redirection optical element DBS1, and (iii) ) a (rotational) orientation of the third light generating device 130 (along an optical axis of the third device light 131) relative to the first multichroic based redirection optical element DBS1. In specific embodiments (e.g. similar to Fig.2, though not depicted) the polarizationcontrol system 600 may do so by controlling the rotational orientation of (the combinedarrangement of) the first light generating device 110, the second light generating device 120, and of the first multichroic based redirection optical element DBS1 (along an optical axis ofthe combined first and second device light 111, 121). In particular, in embodiments, the 2024PF80205 69 polarization control system 600 comprises a movement element 620, especially a rotationalelement, configured to rotate one or more of the first light generating device 110, the secondlight generating device 120, and the third light generating device 130, wherein the polarization control system 600 is configured to control the movement element 620. 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 multichroic based redirectionoptical element DBS1 and / or by controlling a (rotational) orientation of an assembly of thefirst and second light generating devices and the first multichroic based redirection opticalelement DBS1 (including optics in between the light generating devices 110, 120 and the firstmultichroic based redirection optical element DBS1) relative to the first polarization based redirection optical element 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 / orsecond 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 sensorsignal, 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 a maximum wavelength difference (e.g., of 20 nm). A third blue laser light source emits at a wavelength in the range of the first and second laser light sources and provides s-polarized device light. The first PBS is a partial PBS (PPBS1) with a high transmittance (>90%) for p- polarized light of at least one of the first and second device light sources (here for both) and partial transmittance (30-70%) of s-polarized light. The polarization of the light from, in this example, the first and the second source is adjusted via an adjustable birefringent rotator, by which the fraction of diffused blue light in the engine output light is adjusted. The quarter waveplate between PBS2 and the reflective diffuser is designed for the (weighted) average blue wavelength incident on the reflective diffuser 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 may be varied, and the position of the birefringent rotator may be varied by which the achievable range of blue fractions that can be selected for diffusion vs phosphor excitation may be varied as well. 2024PF80205 70 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 multichroic based redirection optical element DBS2, but via the second polarization based redirection optical element PBS2. In this embodiment, the second polarization basedredirection optical element PBS2 is (thus) transmissive for the luminescent material light201. The selectable fractions for luminescent material light and diffuse device light may be (essentially) unchanged relative to the embodiment of Fig.1. Fig.2 schematically depicts a second alternative embodiment, wherein thesecond multichroic based redirection optical element DBS2 is not transmissive for devicelight and reflective for luminescent material light 201, but just the other way around: here themultichroic based redirection optical element DBS2 is transmissive for luminescent materiallight 201 and reflective for the device light. As for the embodiment of Fig.2, the secondpolarization based redirection optical element PBS2 is transmissive for the luminescentmaterial light 201. The selectable fractions for luminescent material light and diffuse devicelight may be (essentially) unchanged relative to the embodiment of Fig.1. Further, in the embodiment as depicted in Figs. 2 and 3, the system 1000further comprises a (second) λ / 2 waveplate 630 configured in an optical path between the first polarization based redirection optical element PPBS1 and the second polarization based redirection optical element PBS2. The (second) λ / 2 waveplate 630 may especially beconfigured to change the linear polarization of the device light propagating to the diffuserarrangement 700. In the depicted embodiments, compared to the embodiment of Fig.1, p- polarized device light may propagate to the diffuser arrangement 700 (via the second polarization based redirection optical element PBS2) rather than s-polarized device light. Fig.4 schematically depicts an alternative embodiment, wherein the birefringent rotator 610 is not located downstream of the first multichroic based redirection optical element DBS1, nor located in an optical path between (i) the first and / or the second light generating device and (ii) the first multichroic based redirection optical element DBS1(as depicted in Figs. 1-3), but in an optical path between the third light generating device 120and the first polarization based redirection optical element PPBS1. Furthermore, in thedepicted embodiment, the first and second device light sources are not configured to provide device light to the luminescent material 200 in a transmissive mode of the first polarization based redirection optical element PPBS1, but in a reflective mode of the first polarizationbased redirection optical element PPBS1. Consequently, the third light generating device 130provides third device light 131 to the luminescent material 200 upon transmission of the third 2024PF80205 71 device light 131 to the luminescent material 200 by the first polarization based redirectionoptical element PPBS1. This configuration may have an altered range of blue / yellow ratio inthe engine output light relative to the embodiments of Figs.1-3. For example, if the first light generating device and the second light generating device provide (only) s-polarized light,then: ts = 30% enables selection of Tlum in the range of 1.7 – 2.4, and Tdif in the range of 0.6 –1.3; ts = 50% enables selection of Tlum in the range of 1.5 – 2.0, and Tdif in the range of 1.0 –1.5; and ts = 70% enables selection of Tlum in the range of 1.3 – 1.6, and Tdif in the range of1.4 – 1.7.Furthermore, in the embodiment depicted in Fig.4, instead of rotation of the polarization rotator 610, a (rotational) orientation of the (third) light generating device relative to the first multichroic based redirection optical element DBS1 may be provided through mechanical rotation of the light generating device about an axis of its respective device light. Hence, in such embodiments, the polarization rotator 610 may essentially be omitted from the light generating system 1000. Additionally or alternatively, in embodiments (e.g. similar to the above described through the use of the movement element 620) the rotational orientation of the combined arrangement of the first light generating device 110, the second light generating device 120, and of the first multichroic based redirection optical element DBS1 (along an optical axis of the combined first and second device light 111, 121)may be provided through mechanical rotation of the combined arrangement of the first lightgenerating device 110, the second light generating device 120, and of the first multichroic based redirection optical element DBS1. Fig. 5 schematically depicts another alternative embodiment, wherein thediffuser arrangement 700 is configured in the reflective mode and as non-collineararrangement. In such embodiments, the light generating system 1000 is configured such thatan optical axis (Oi) of incoming device light (comprising two or more of first device light111, second device light 121 and third device light 131) relative to a normal to the diffuser710 and an optical axis (Or) of outgoing diffused device light 711 relative to the normal to the diffuser 710 have a mutual angle (β) unequal to 0°. Furthermore, Fig.5 schematically depicts an embodiments, wherein the light generating system 1000 further comprises a fourth light generating device 140 and an additional redirection optical element 515 comprising one of a third multichroic based redirection optical element DBS3 and a third polarization based redirection optical element PBS3. 2024PF80205 72 The fourth light generating device 140 may be configured to generate fourthdevice light 141 having a fourth centroid wavelength λc4. Therefore, the fourth lightgenerating device 140 may comprises one or more of a laser diode, a superluminescent diode,and a stacked multi-junction light-emitting diode. In specific embodiments, the fourth light generating device comprises a fourth laser bank comprising a plurality of fourth solid-statelight sources 40, especially fourth lasers. The fourth solid-state light sources 40 may beconfigured to generate fourth device light 41.As depicted in Fig. 5, the additional redirection optical element 515 may beconfigured in an optical path between the fourth light generating device 141 and the diffuser arrangement 700 and in an optical path between the first polarization based redirection optical element PPBS1 and the diffuser arrangement 700. In embodiments, the additional redirection optical element 515 may comprisea third multichroic based redirection optical element DBS3 configured to combine fourth device light 141 received by the additional redirection optical element 515 and two or moreof first device light 111, second device light 121 and third device light 131 received by theadditional redirection optical element 515 in an optical path to the diffuser arrangement 700in dependence of their spectral power distribution. Hence, in such embodiments, one or moreof |λc4-λc1| ≥ 10 nm, |λc4-λc2| ≥ 10 nm, and |λc4-λc3| ≥ 10 nm may apply (such as especially as depicted |λc4-λc2| ≥ 10 nm, and |λc4-λc3| ≥ 10 nm). Furthermore, in such embodiments, there may be essentially no polarization requirements of the device light received by the third multichroic based redirection optical element DBS3. In alternative embodiments, wherein the diffuser arrangement 700 comprises the non-collinear arrangement as depicted here, the additional redirection optical element 515 may comprise a third polarization based redirection optical element PBS3 configured to combine fourth device light 141 received by the additional redirection optical element 515and two or more of first device light 111, second device light 121 and third device light 131received by the additional redirection optical element 515 in an optical path to the diffuserarrangement 700 in dependence of their polarizations. Hence, in such embodiments, thefourth device light 141 may have a different (especially orthogonal) linear polarization relative to one or more of the first, second, and third device light (such as especially as depicted the second and third device light 121,131) Furthermore, in such embodiments, there may be essentially no spectral requirements of the device light received by the third polarization based redirection optical element PBS3. 2024PF80205 73 Furthermore, the invention may provide an embodiment (not depicted), similar to the embodiment depicted in Fig.1, but wherein the first polarization redirection opticsPPBS1 is additionally provided with a dichroic mirror that reflects the first device lightsource light and transmits the second device light source light. In such embodiments, the first device light 111 received by the first polarization redirection optics PPBS1 may further (conversely to the depicted embodiment in Fig.1) be s-polarized. Therefore, in such embodiments, the polarization rotator 610 may be configured in an optical path between the second light generating device 120 and the first multichroic based redirection optical element DBS1 (rather than between the first multichroic based redirection optical element DBS1 and the first polarization redirection optics PPBS1 as depicted in Fig.1). In other words, the polarization control system 600 may, in such embodiments, be configured to control the polarization of the second device light 121 received by the first polarization redirection optics PPBS1 while the first device light 111 may have a fixed linear (s-)polarization. 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 s-polarized light of the second device light source, and can be exemplified asfollows: if (A) λc2 = λc3 then ts = 30% enables selection of Tdif from the range of 1.3–2.0 andof Tlum of 1.0–1.7; ts = 50% enables selection of Tdif from the range of 1.5–2.0, and of Tlum from the range of 1.0–1.5; and ts= 70% enables selection of Tdiffrom the range of 1.7–2.0,and of Tlum from the range of 1.0–1.3. Instead, if (B) λc1 = λc3 then ts = 30% enables selectionof Tdif from the range of 1–1.7, and of Tlum from the range of 1.3–2; ts = 50% enablesselection of Tdif from the range of 1–1.5, and of Tlum from the range of 1.5–2; and ts = 70%enables selection of Tdif from the range of 1–1.3, and of Tlum from the range of 1.7-2.Fig. 6 schematically depicts an embodiment of the lighting device 1200comprising the light generating system 1000 of the invention. The lighting device 1200 maybe selected from the group of a lamp 1, a luminaire 2, a projector device 3, a disinfectiondevice, a photochemical reactor, and an optical wireless communication device. Specifically,Fig. 6 schematically depicts an embodiment of a luminaire 2 comprising the light generatingsystem 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 thelight generating system 1000. Fig. 6 also schematically depicts an embodiment of lamp 1comprising the light generating system 1000. Reference 3 indicates a projector device or 2024PF80205 74 projector system, which may be used to project images, such as at a wall, which may alsocomprise the light generating system 1000. Hence, Fig. 6 schematically depicts embodimentsof 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 embodimentsthus be system light 1001. Reference 1300 refers to a space, such as a room. Reference 1305refers 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 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 andoptionally one or more other species". Use of the verb "to comprise" and its conjugationsdoes 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 2024PF80205 75 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 describedduring operation. As will be clear to the person skilled in the art, the invention is not limitedto 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 severaldistinct elements, and by means of a suitably programmed computer. In a device claim, or anapparatus 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 thesemeasures cannot be used to advantage. In yet a further aspect, the invention (thus) provides asoftware product, which, when running on a computer is capable of bringing about (one or more embodiments of) the method as described herein. The invention also provides a control system that may control the device, apparatus, or system, or that may execute the herein described method or process. Yet further, the invention also provides a computer program product, when running on a 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 oneor 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 toprovide additional advantages. Further, the person skilled in the art will understand thatembodiments 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

2024PF80205 76 CLAIMS:

1. A light generating system (1000) comprising a first light generating device(110), a second light generating device (120), a third light generating device (130), a luminescent material (200), a control system (300), optics (500), a polarization control system (600), a diffuser arrangement (700), and a light exit (1090); wherein:- the light generating devices (110,120,130) comprise solid-state light source(10,20,30) selected from the group of diode lasers, superluminescent diodes, and multi- junction diodes; wherein (i) the first light generating device (110) is configured to provide first device light (111) having a first centroid wavelength (λc1), (ii) the second light generating device (120) is configured to provide second device light (121) having a second centroid wavelength (λc2), and (iii) the third light generating device (130) is configured to provide third device light (131) having a third centroid wavelength (λc3); wherein the first centroid wavelength (λc1), the second centroid wavelength (λc2), and the third centroid wavelength (λc3) are individually selected from the wavelength range of 380-780 nm; wherein |λc1-λc2| ≥ 5 nm;- the optics (500) comprise redirection optical elements (510); wherein theredirection optical elements (510) comprise a polarization based redirection optical element (PPBS1) and multichroic based redirection optical elements (DBS1,DBS2);- a first multichroic based redirection optical element (DBS1) selected from theoptics (500) is (i) configured in a light-receiving relationship with the first light generating device (110) and the second light generating device (120) and is (ii) configured to combine first device light (111) and second device light (121) received by the first multichroic based redirection optical element (DBS1);- a first polarization based redirection optical element (PPBS1) selected fromthe optics (500) is configured in a light-receiving relationship with (a) the first multichroicbased redirection optical element (DBS1) and (b) the third light generating device (130),wherein the first polarization based redirection optical element (PPBS1) is (i) at least partly transmissive for p-polarized device light, and (ii) at least partly reflective and at least partly transmissive for s-polarized device light; wherein the first polarization based redirection optical element (PPBS1) is configured to direct device light received by the first polarization2024PF80205 77 based redirection optical elements (PPBS1), in dependence of its polarization, in one or more of (a) an optical path to the luminescent material (200) and (b) an optical path to the diffuser arrangement (700);- the luminescent material (200) is configured to convert at least part of thedevice light received by the luminescent material (200) from at least one of the light generating devices (110,120,130) into luminescent material light (201):- a second multichroic based redirection optical elements (DBS2) selected fromthe optics (500) is configured in a light-receiving relationship with the first polarization based redirection optical element (PPBS1), wherein the second multichroic based redirection optical elements (DBS2) is configured to direct device light received by the second multichroic based redirection optical elements (DBS2) in an optical path to the luminescent material (200) and to direct the luminescent material light (201) received by the secondmultichroic based redirection optical elements (DBS2) in an optical path to the light exit(1090);- the diffuser arrangement (700) comprises a diffuser (710); wherein the diffuserarrangement (700) is configured to diffuse at least part of the device light received by the diffuser arrangement (700) from at least one of the light generating devices (110,120,130) into diffused device light (711);- at least one of the redirection optical elements (510) is configured to directdiffused device light (711) received by the optics (500) from the diffuser arrangement (700) in an optical path to the light exit (1090);- the light generating system (1000) is configured such that in an operationalmode of the light generating system (1000) the first device light (111), the second device light (121), and the third device light (121) received by the first polarization based redirection optical element (PPBS1) comprise linear polarized light;- the polarization control system (600) is configured to control a polarization ofdevice light propagating from the first multichroic based redirection optical elements (DBS1) to the first polarization based redirection optical elements (PPBS1), thereby controlling a power distribution of the device light over the optical paths to the luminescent material (200) and the diffuser arrangement (700);- the light generating system (1000) is configured to provide, via the light exit(1090), system light (1001); wherein the control system (300) is configured to control thesystem light (1001); wherein the control system (300) is configured to control a spectralpower distribution of the system light (1001) by controlling one or more of (i) the2024PF80205 78 polarization control system (600) and (ii) one or more of the light generating devices (110,120,130); wherein in an operational mode of the light generating system (1000) thesystem light (1001) comprises one or more of at least part of the luminescent material light(201) and at least part of the diffused device light (711) .

2. The light generating system (1000) according to claim 1, wherein the firstpolarization based redirection optical element (PPBS1) has a transmittance for p-polarized device light of at least 90%, and a transmittance for s-polarized device light selected from the range of 20-80% for at least one of λc2and λc1; wherein the third device light (131) comprises s-polarized light; 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.

3. The light generating system (1000) according to any one of the precedingclaims, wherein the polarization control system (600) comprises one or more of:(a) a birefringent rotator (610) configured (i) downstream one of the first light generating device (110), the second light generating device (120) and the third light generating device (130) and upstream of the first multichroic based redirection optical element (DBS1), or (ii) downstream of the first multichroic based redirection optical element (DBS1) and upstream of the first polarization based redirection optical element (PBS1); wherein the polarization control system (600) is configured to control rotation of the birefringent rotator (610); and wherein the birefringent rotator (610) comprises a λ / 2 waveplate; and (b) a movement element (620) configured to rotate one or more of the firstlight generating device (110), the second light generating device (120), and the third light generating device (130), wherein the polarization control system (600) is configured tocontrol the movement element (620); and4. The light generating system (1000) according to any one of the precedingclaims, wherein 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, wherein |λc1-λc2| ≤ 20 nm, and wherein λc1 ≤ λc3 ≤ λc2 or λc2 ≤ λc3 ≤ λc1 applies.2024PF80205 795. The light generating system (1000) according to any one of the precedingclaims, wherein:- the diffuser arrangement (7000) is configured as collinear arrangement,wherein incoming device light comprising two or more of first device light (111), second device light (121), and third device light (131), received by the diffuser arrangement (700), propagates over at least part of its optical path collinear with an optical path of the diffused device light (711) propagating from the diffuser arrangement (700) to the light exit (1090); and- the optics (500) comprise a second polarization based redirection opticalelement (PBS2) configured in an optical path between the first polarization based redirection optical element (PPBS1) and the diffuser arrangement (700); wherein the second polarization based redirection optical element (PBS2) is configured to (i) direct device light, received by the second polarization based redirection optical element (PBS2), to the diffuser arrangement (700), and (ii) direct diffused device light (711) received from the diffuser arrangement (700) in an optical path to the light exit (1090).

6. The light generating system (1000) according to claim 5, wherein the diffuser(700) comprises a polarization maintaining diffuser; wherein the diffuser arrangement (700) further comprises a λ / 4 waveplate (720) configured between the second polarization based redirection optical element (PBS2) and the diffuser (710), wherein the second polarization based redirection optical element (PBS2) is configured to direct device light, received by the second polarization based redirection optical element (PBS2), to the λ / 4 waveplate (720), wherein the λ / 4 waveplate (720) is configured to convert linear polarized light received by the λ / 4 waveplate (720) into elliptical polarized light and to convert elliptical polarized light received by the λ / 4 waveplate (720) into linear polarized light.

7. The light generating system (1000) according to claim 6, wherein (a) thesecond polarization based redirection optical element (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 multichroic based redirection optical element (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).2024PF80205 808. The light generating system (1000) according to any one of the precedingclaims 5-7, further comprising a λ / 2 waveplate (630) configured in an optical path between the first polarization based redirection optical element (PPBS1) and the second polarization based redirection optical element (PBS2).

9. The light generating system (1000) according to any one of the precedingclaims 1-4, wherein the diffuser arrangement (700) is configured in the reflective mode, wherein the diffuser arrangement (700) is configured as non-collinear arrangement; wherein the light generating system (1000) is configured such that an optical axis (Oi) of incoming device light relative to the normal to the diffuser (710) and an optical axis (Or) of outgoing diffused device light (711) relative to the normal to the diffuser (710) have a mutual angle (β) unequal to 0°.

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

11. The light generating system (1000) according to any one of the precedingclaims, wherein one of the following applies:- the second multichroic based redirection optical element (DBS2) is configureddownstream of both the first polarization based redirection optical element (PPBS1) and the second polarization based redirection optical element (PBS2); or- the second polarization based redirection optical element (PBS2) is configureddownstream of both the first polarization based redirection optical element (PPBS1) and the second multichroic based redirection optical element (DBS2); and wherein the second polarization based redirection optical element (PBS2) is transmissive for the luminescent material light (201).

12. The light generating system (1000) according to any one of the precedingclaims, further comprising a fourth light generating device (140) an additional redirection optical element (515) comprising one of a third multichroic based redirection optical element (DBS3) and a third polarization based redirection optical element (PBS3); wherein:2024PF80205 81- the fourth light generating device (140) is configured to generate fourth devicelight (141) having a fourth centroid wavelength (λc4); wherein the fourth light generating device (140) comprises one or more of a laser diode, a superluminescent diode, and a stacked multi-junction light-emitting diode;- the additional redirection optical element (515) is configured in an optical pathbetween the fourth light generating device (141) and the diffuser arrangement (700) and in an optical path between the first polarization based redirection optical element (PPBS1) and the diffuser arrangement (700); and- one of the following applies: (i) the additional redirection optical element(515) comprises a third multichroic based redirection optical element (DBS3) configured to combine fourth device light (141) received by the additional redirection optical element (515) and two or more of first device light (111), second device light (121) and third device light (131) received by the additional redirection optical element (515) in an optical path to the diffuser arrangement (700) in dependence of their spectral power distribution; or (ii) the diffuser arrangement (700) comprises the non-collinear arrangement as defined in claim 9 and the additional redirection optical element (515) comprises a third polarization based redirection optical element (PBS3) configured to combine fourth device light (141) received by the additional redirection optical element (515) and two or more of first device light (111), second device light (121) and third device light (131) received by the additional redirection optical element (515) in an optical path to the diffuser arrangement (700) in dependence of their polarizations.

13. The light generating system (1000) according to any one of the precedingclaims, wherein the first light generating device (110) comprises a first laser bank comprising a plurality of first lasers (10), wherein the second light generating device (120) comprises a second laser bank comprising a plurality of second lasers (20), wherein the third light generating device (130) comprises a third laser bank comprising a plurality of third lasers (30).

14. The light generating system (1000) according to any one of the precedingclaims, 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;2024PF80205 82 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.

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

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