Laser-phosphor engine comprising a central beam splitting cube

Abstract

The invention provides a light generating system (1000) comprising a first light generating device (110), a luminescent material (200), a control system (300), optics (500), a polarization control system (600), a diffuser system (1710), and a light exit (1090); wherein: (A) the first light generating device (110) is configured to generate first device light (111); (B) the luminescent material (200) is configured to convert first device light (111) received by the luminescent material (200) into luminescent material light (201): (C) the diffuser system (1710) is configured to diffuse first device light (111) received by the diffuser system (1710) into diffused device light (711); (D) the optics (500) comprise a first polarization based redirection optics (PBS1) and a central redirection optics (CBS); (E) the first polarization based redirection optics (PBS1) is (a) configured to transmit light having a first linear polarization and reflect light having a second linear polarization or is (b) configured to reflect light having a first linear polarization and transmit light having a second linear polarization; and wherein the light generating system (1000) is configured such that the first device light (111) reaching the first polarization based redirection optics (PBS1) comprises linear polarized light; (F) the polarization control system (600) is configured to control a polarization of diffused device light (711) reaching the central redirection optics (CBS); (G) the central redirection optics (CBS) comprises an orthogonal arrangement of a polarization based redirection optics (CPBS) and a dichroic based redirection optics (CDBS); the polarization based redirection optics (CPBS) is (a) configured to transmit light having a first linear polarization and reflect light having a second linear polarization or is (b) configured to reflect light having a first linear polarization and transmit light having a second linear polarization; the dichroic based redirection optics (CDBS) is configured to reflect or transmit light in dependence of a spectral wavelength of the light; the central redirection optics (CBS) is configured such that (a) in dependence of the polarization of light received by the central redirection optics (CBS), at least part of the light is directed to the light exit (1090) and / or at least part of the light is directed to the luminescent material (200), and (b) at least part of the luminescent material light (201) is directed to the light exit (1090).

Description

[0001]2023PF80536 1 LASER-PHOSPHOR ENGINE COMPRISING A CENTRAL BEAM SPLITTING CUBE FIELD OF THE INVENTION The invention relates to a light generating system. The invention further relates to a lighting device comprising the light generating system. BACKGROUND OF THE INVENTION Laser-phosphor based lighting fixtures are known in the art. For instance, WO2022143318 describes a light emitting device, comprising a first light source, a second light source, a dichroic mirror, a wavelength conversion apparatus, a first light path 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 components used, the engine volume is large due to the many components, and the system cost are high 2023PF80536 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. Laser-phosphor systems may be capable to generate only a single color point as defined by the luminescent converter, the wavelength of the blue pump light source, and the realized ratio of blue and luminescent light in the output light. Creation of a product range providing different color points of the output beam may in this case be elaborate 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 may be limited by the components used, the engine volume may be large due to the many components, and the system cost are high due to the many dedicated components. It may be an option to combine pump-light and luminescent light by using 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, the diffused light may toa large degree be depolarized, resulting in relatively high losses of diffused blue light at abeam combiner where it is combined with the luminescent light into white output light. In addition, using a single laser source (that may comprise multiple laser diodes) may significantly limit the maximum output power due to size limitations to the optical components. Various other options using two blue laser light sources may also be considered. In a first configuration, one of the laser sources may fully be used to pump a luminescent material and another one may partly be used to pump that same luminescent material and partly be used to be diffused after which this is used to contribute to the white output light. In this way, 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. In a second configuration, a ratio of pump light and diffused light may be set via the drive currents to the two laser sources. Yet in a third configuration, two laser banks emitting with different wavelengths may be used by combining the light from both sources via a dichroic beam combiner. This may put, however, additional constraints on both the laser sources and on the dichroic beam splitter which may make the system costly and less efficient due to potential presence of partial spectral overlap. In fourth configurations, two 2023PF80536 3 laser banks may be combined that have a different maximum output powers. The latter, however, may limit the maximum system output and / or the CCT tuning range. Hence, it is an aspect of the invention to provide an alternative light generating system, which preferably further at least partly obviates one or more of above-described drawbacks. The present invention may have as object to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative. When e.g. two laser beams of substantially the same wavelength are combined by a polarizing beam splitter, then both sources may need to have orthogonal polarizations. This may be very suitable for a system that only needs to provide a single color point of the output light. For systems that have a selectable output CCT, a more complex configuration with multiple optical components may be needed to achieve maximum output (i.e., operating all device light sources at maximum power) independent of CCT settings. This may increase cost, robustness, and volume of the engine. Additionally, the blue device light that is reflected from the luminescent material may typically be lost due to the dichroic combination schemes used. In the current invention, in embodiments, it may be applied that dichroic and polarization beam splitting functions may be integrated into a single optical component in the form of a cube beam splitter / combiner and / or integration of these dichroic and polarization filter functions into a single component but with orthogonal filter interfaces may (also) enable alternative light source architectures that are not possible by using flat plate beam combiners / splitters. According to a first aspect, the invention provides a light generating system (“system”) comprising a first light generating device, a luminescent material, a control system, optics, a polarization control system, a diffuser system, and a light exit. In embodiments, the first light generating device may comprise a solid-state light source, especially selected from the group of diode lasers, superluminescent diodes, and multi- junction light emitting diodes. Further, the first light generating device may be configured to generate first device light. Especially, the luminescent material may be configured to convert first device light received by the luminescent material into luminescent material light. Further, in embodiments the diffuser system may be configured to diffuse first device light received by the diffuser system into diffused device light. Yet, in embodiments the optics may comprise a first polarization based redirection optics (PBS1) and a central redirection optics (CBS). Especially, in embodiments the first polarization based redirection optics (PBS1) may be (a) configured to transmit light having a first linear polarization and reflect 2023PF80536 4 light having a second linear polarization or may be (b) configured to reflect light having a first linear polarization and transmit light having a second linear polarization. Yet, inembodiments the first polarization based redirection optics (PBS1) may be configured in anoptical path between the first light generating device and the diffuser system. Especially, in embodiments the light generating system may be configured such that the first device light reaching the first polarization based redirection optics (PBS1) comprises linear polarized light. Further, in embodiments the polarization control system may be configured to control a polarization of diffused device light reaching the central redirection optics (CBS). Yet, in embodiments the central redirection optics (CBS) may comprise an orthogonal arrangement of a polarization based redirection optics (CPBS) and a dichroic based redirection optics (CDBS). Especially, in embodiments the polarization based redirection optics (CPBS) may be (a) configured to transmit light having a first linear polarization and reflect light having a second linear polarization or may be (b) configured to reflect light having a first linear polarization and transmit light having a second linear polarization. In embodiments, the dichroic based redirection optics (CDBS) may be configured to reflect or transmit light in dependence of a spectral wavelength of the light. Further, in embodiments the central redirection optics (CBS) may be configured in an optical path between the first polarization based redirection optics (PBS1) and the light exit. Especially, in embodiments the central redirection optics (CBS) may be configured such that (a) in dependence of the polarization of light received by the central redirection optics (CBS), at least part of the light may be directed to the light exit and / or at least part of the light may be directed to the luminescent material, and (b) at least part of the luminescent material light may be directed to the light exit. Especially, the light generating system may be configured to generate system light. In embodiments, in a first operational mode of the light generating system the system light may be white light comprising at least part of the luminescent material light and at least part of the diffused device light. Further, in embodiments the control system may be configured to control a spectral power distribution of the system light. Hence, in embodiments the invention provides a light generating system comprising a first light generating device, a luminescent material, a control system, optics, a polarization control system, a diffuser system, and a light exit; wherein: (A) the first light generating device comprise a solid-state light source selected from the group of diode lasers, superluminescent diodes, and multi- junction light emitting diodes; wherein the first light generating device is configured to generate first device light; (B) the luminescent material is configured to convert first device light received by the luminescent material into luminescent material light: (C) the diffuser 2023PF80536 5 system is configured to diffuse first device light received by the diffuser system into diffused device light; (D) the optics comprise a first polarization based redirection optics (PBS1) and a central redirection optics (CBS); (E) the first polarization based redirection optics (PBS1) is (a) configured to transmit light having a first linear polarization and reflect light having a second linear polarization or is (b) configured to reflect light having a first linear polarization and transmit light having a second linear polarization; wherein the first polarization based redirection optics (PBS1) is configured in an optical path between the first light generating device and the diffuser system; and wherein the light generating system is configured such that the first device light reaching the first polarization based redirection optics (PBS1) comprises linear polarized light; (F) the polarization control system is configured to control a polarization of diffused device light reaching the central redirection optics (CBS); (G) the central redirection optics (CBS) comprises an orthogonal arrangement of a polarization based redirection optics (CPBS) and a dichroic based redirection optics (CDBS); the polarization based redirection optics (CPBS) is (a) configured to transmit light having a first linear polarization and reflect light having a second linear polarization or is (b) configured to reflect light having a first linear polarization and transmit light having a second linear polarization; the dichroic based redirection optics (CDBS) is configured to reflect or transmit light in dependence of a spectral wavelength of the light; the central redirection optics (CBS) is configured in an optical path between the first polarization based redirection optics (PBS1) and the light exit; the central redirection optics (CBS) is configured such that (a) in dependence of the polarization of light received by the central redirection optics (CBS), at least part of the light is directed to the light exit and ( / or) at least part of the light is directed to the luminescent material, and (b) at least part of the luminescent material light is directed to the light exit; (H) the light generating system is configured to generate system light; wherein in a first operational mode of the light generating system the system light is white light comprising at least part of the luminescent material light and at least part of the diffused device light; and (I) the control system is configured to control a spectral power distribution of the system light. Note that embodiments the central redirection optics (CBS) may be configured such that in an operational mode of the system (a) in dependence of the polarization of light received by the central redirection optics (CBS), at least part of the light may be directed to the light exit and at least part of the light may be directed to the luminescent material. Amongst others, the current invention may provide a solution for reducing the blue device light losses upon reflectance from the luminescent material. It further may enable 2023PF80536 6 compact and highly efficient laser-phosphor light engines that may comprise two or more laser sources with either substantially the same or with different spectral characteristics, while enabling selection of the output CCT at constant power operation of the various device light sources. It may further provide an intrinsic (eye) safety against malfunctioning of laser light diffusing components or luminescent conversion components. Furthermore, it may enable more freedom for high brightness and high-power light source implementations. Yet further, with such a system the color point may easily be adjusted in the factory and / or by the user, for any of the color points selected in a predetermined range ofwhite light output color points (e.g. 6000 – 10000 K)(though lower may also be possible; seealso below), while providing highly efficient collection of all the spectral contributions to the output light, resulting in a relatively high efficiency high brightness and high flux (e.g. ≥40 klm) white light engine (however, herein lower flux solutions, like e.g. at least 5 klm, are not excluded). Hence, the invention may provide a constant power tunable CCT laser-phosphor source comprising three laser banks. The light generating system (or “system”) may thus comprise a first light generating device, a luminescent material, a control system, optics, a polarization control system, a diffuser system, and a light exit. Here below, embodiments of the different components of the light generating system will be described in further detail. The light generating system comprises a first light generating device. In embodiments, the light generating system may also comprise a second light generating device. In yet further embodiments, the light generating system may also comprise a third light generating device (thus in addition to the first light generating device and the second light generating device). For the light generating device(s), some embodiments are described below. 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 device may comprise one or more of a laser diode, a superluminescent diode, and a stacked 2023PF80536 7 multi-junction light-emitting diode (LED). The first light generating device may herein also comprise a plurality of first (solid state) light sources. Especially, in specific embodiments, the first light generating device may comprise a first laser bank comprising a plurality of first lasers. A laser bank may comprise a relatively dense assembly of multiple laser diodes on a shared substrate provided with collimating optics, such as collimating lenses comprising one lens per laser diode (e.g. arranged in an array of lenses, see also further below). The use of laser banks may especially be convenient for projecting a beam of high power laser light onto a luminescent converter without the need for using an inverse beam expander. In embodiments, 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). Especially, a laser bank may comprise a light emitting arrangement comprising an (2D) array of a plurality of laser diodes arranged on a thermally conductive carrier and a (lens array having a) plurality of collimator lenses corresponding to the laser diodes such that each laser diode of the plurality of laser diodes comprises a collimator lens for collimating laser light emitted by the laser diode. The arrangement may comprise a package architecture or a canned architecture. In case of the package architecture a laser diode chip array is arranged on the thermally conductive carrier. A plurality of electrodes may be present for electrically connecting the plurality of laser diodes. The 2D array may e.g. comprise at least 8 laser diodes. 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. Depending on the desired output beam characteristics, additional beam shaping optics may be needed. Laser banks may be used to boast the input power. Note that an array of solid state light sources may provide multiple light generating devices, such as a first light generating device and a second light generating device. For instance, a subset of laser diodes of an array of laser diodes may be used as first light generating device, and its device light may at least partially follow another optical path than device light of another subset of laser diodes from that array (of laser diodes). Hence, in embodiments a single laser bank may be applied, of which the light is split in multiple portions, effectively providing multiple light generating devices. In general, this may imply the application of optics, allowing to divide the laser light of multiple subsets of lasers from the same bank into their respective (separate) beams of light that at least partially do not have identical optical paths (in the light generating system). The subsets may comprise one or 2023PF80536 8 more of the laser diodes of the laser bank. However, especially a single laser diode may only be comprised by a single subset. Notwithstanding such embodiments, of course also multiple laser banks may be used to provide multiple light generating devices. In some embodiments, the one or more light generating devices may comprise a first light generating device (e.g. a first laser bank) and a discrete second light generating device (e.g. a second laser bank) and / or a discrete third light generating device (e.g. a third laser bank). In such embodiments, characteristics of the system light may be controllable through (i) individual control (or manipulation) of the (e.g. radiant flux) of the light generating devices, (ii) individual control (or manipulation) of light characteristics such as polarization of the device light generated by the respective light generating devices, and / or (iii) control (or configuration) of optical (beam splitting / combining) components downstream of the light generating devices, see also further below. Hence, such embodiments may provide controllability at the device, downstream of the device, and at the optics. Additionally or alternatively, in some embodiments, the one or more light generating devices may comprise a (single) light generating device (e.g. a laser bank) comprising a multiple subsets of (solid state) light sources (e.g. a laser bank comprising a first subset of lasers and a second subset of lasers). In such embodiments, characteristics of the system light may be controllable through (i) individual control (or manipulation) of the (e.g. radiant flux) of the subsets of (solid state) light sources in the light generating device, (ii) individual control (or manipulation) of light characteristics such as polarization of the device light generated by the respective subsets of (solid state) light sources in the light generating device, and / or (iii) control (or configuration) of optical (beam splitting / combining) components downstream of the light generating device, see also further below. Hence, such embodiments may provide controllability at the device, downstream of the device, and at the optics. Yet additionally or alternatively, in some embodiments, the one or more light generating devices may comprise a single light generating device (e.g. a laser bank). In such embodiments, characteristics of the system light may be controllable through (i) control (or manipulation) of light characteristics such as polarization of the device light generated by the light generating device, and / or (ii) control (or configuration) of optical (beam splitting / combining) components downstream of the light generating device, see also further below. Hence, such embodiments may provide controllability downstream of the device and at the optics. 2023PF80536 9 It may also be possible to control subsets of lasers from a laser bank, like e.g. a laser bank comprising two or more strings of laser. Together with optics, it may be possible to provide two or mor individually controllable beams of light from a single laser bank. However, it may also be possible to split laser light from a laser bank with optics in two (or more beams), e.g. with a (neutral) beam splitter, or with controllable polarization (as also described herein. In embodiments the first light generating device may comprise a laser bank. Inembodiments, wherein the optional second light generating device is applied, the second light generating device may comprise a laser bank. In embodiments, wherein the optional third light generating device is applied, the third light generating device may comprise a laser bank. In embodiments, one or more light generating devices may generate first device light, and optionally one or more of second device light and third device light. The one or more light generating devices may comprise one or more laser banks. In embodiments, the first light generating device, the optional second light generating device, and the optional 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, 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. 2023PF80536 10 Hence, in embodiments the first light generating device may comprise a solid- state light source selected from the group of diode lasers, superluminescent diodes, and multi-junction light emitting diodes, wherein the first light generating device is configured to generate first device light. During use, at least part of the device light (i.e., at least part of one or more of the first device light, the optional second device light) may, especially via first polarization redirection optics (see below), be provided to a luminescent material. The light generating system may thus comprise a luminescent material, especially a luminescent element comprising a luminescent material. The luminescent 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. Especially when blue light is partly converted, the blue device light may be used as source of blue light (for the system light) and as excitation light that can be converted by the luminescent material. The first radiation may especially be provided by a (solid state) light source. Hence, in embodiments, the luminescent material may be configured to convert at least part of (combined) device light received by the luminescent material into luminescent material light. Especially, in embodiments, the luminescent material may be configured to convert at least 50%, such as at least 60%, like at least 70% of the (combined) device light received by the luminescent material (arrangement) into luminescent material light. Especially, in embodiments, the luminescent material may be configured to convert at least 80%, more especially at least 90%, including 100% of the (combined) device light received by the luminescent material (arrangement) into luminescent material light. The phrase “... light received by ...”, and similar phrases, such as “device light received by the luminescent material” (or “… by a polarizing beam splitter”, etc.) may especially indicate that when the light is actually received by the element, an action may take place. The action may in embodiments be one or more of conversion, reflection, andtransmission. Further, the action may also include refraction. Whether or not such element 2023PF80536 11 receives light may e.g. depend on e.g. a controlling mode (for instance whether or not a light generating device provides light). When different luminescent materials are applied, one or more luminescent materials may be configured to convert incident light into one or more of green and yellow luminescent material light, and one or more other luminescent materials may be configured to convert incident light into one or more of orange and red luminescent material light. The term “luminescent material” especially refers to a material that can convert first radiation, especially one or more of UV radiation and blue radiation, into second radiation. In general, the first radiation and the second radiation have different spectral power distributions. Hence, instead of the term “luminescent material”, also the terms “luminescent converter” or “converter” may be applied. Further, instead of the term “luminescent material” also the term “phosphor” may be applied. These terms are known to the person skilled in the art. In general, the second radiation has a spectral power distribution at larger wavelengths than the first radiation, which is the case in the so-called down-conversion. In specific embodiments, however the second radiation has a spectral power distribution with intensity at smaller wavelengths than the first radiation, which is the case in the so-called up- conversion. In embodiments, the “luminescent material” may especially refer to a material that can convert radiation into e.g. visible and / or infrared light. For instance, in embodiments the luminescent material may be able to convert one or more of UV radiation and blue radiation, into (other) visible light. The luminescent material may in specific embodiments also convert radiation into infrared radiation (IR). Hence, upon excitation with radiation, the luminescent material emits radiation. The term “luminescence” may herein also refer to phosphorescence and / or fluorescence. Instead of the term “luminescence”, also the term “emission” may be applied. Hence, the terms “first radiation” and “second radiation” may refer to excitation radiation and emission (radiation), respectively. In embodiments, the term “luminescent material” may herein also refer to a phosphorescent material and / or to a fluorescent material. The term “luminescent material” may also refer to a plurality of different luminescent materials. Hence, the term “luminescent material” may in specific embodiments also refer to a luminescent material composition. The term “luminescent material” herein may also refer to a material comprising a luminescent material, such as a light transmissivehost comprising the luminescent material. Examples of possible luminescent materials areindicated further below. 2023PF80536 12 Hence, the luminescent material may in embodiments especially be configured to convert first device light received by the luminescent material into luminescent material light. Likewise, would a second device be applied, the luminescent material may in embodiments especially be configured to convert (also) second device light received by the luminescent material into luminescent material light. Whether or not first device light and / or second device light is received by the luminescent material may depend upon the (temporary) settings of the system during operation of the system. Phrases like “configured to convert first device light received by the luminescent material into luminescent material light”, and similar phrases, may indicate that at least part of the first device light received by the luminescent material is converted into luminescent material light. However, this does not exclude that some of the first device light received by the luminescent material may be reflected (e.g. due to scattering at the surface) and / or part of the first device light received by the luminescent material is not converted into luminescent material light, but converted into heat (e.g. due to Stokes losses). In embodiments, the light generating system may further comprise a diffuser system. The diffuser system may especially comprise a polarization converter and a diffuser. The term ‘polarization converter’ may herein refer to an (optical) element configured to change the polarization state of light traveling therethrough. The polarization converter may, in embodiments, comprise a birefringent rotator, more especially a λ / 4 waveplate (or: “quarter wave plate”; QWP). 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 froms to p or from p to s polarization), and a quarter-wave plate may convert linearly polarizedlight into elliptically (such as especially circularly) polarized light (and vice versa). The polarization converter, especially the λ / 4 waveplate, may especially be configured between (relative to the propagation of light through the system) the second polarization redirection optics (see below) and the diffuser. Further, in embodiments, the polarization converter,especially the λ / 4 waveplate, may be configured between (relative to the propagation of lightthrough the system) the diffuser and the light exit. The polarization converter may thus be arranged both upstream and downstream of the diffuser. The diffuser may, in embodiments, be configured to diffuse at least part of the device light received by the diffuser system into diffused device light. Especially, inembodiments, the diffuser may be configured to diffuse at least 30%, like at least 50%, suchas at least 60%, like at least 70% of the device light, received by the diffuser system, 2023PF80536 13 especially by the diffuser, into diffused device light. Especially, in embodiments, the diffuser may be configured to diffuse at least 80%, more especially at least 90%, including 100% of the device light received by the diffuser system, especially by the diffuser, into diffused device light. In embodiments, the diffuser may especially comprise a substantially polarization maintaining diffuser, i.e., the diffuser may be configured to substantially maintain the polarization of the incident light upon diffusion (and in some embodimentsreflection)(even though the handedness may (thus) change). Such embodiments may bebeneficial as depolarization at the diffuser may be reduced, therewith improving the efficiency of the contribution of the diffuser arrangement to the system light. For instance, in embodiments, the diffuser may comprise a metal coated surface textured glass substrate mounted on a heat conductive material such as e.g. a metal or a ceramic. In such embodiments, the heat conductive material may be configured to conduct away heat that may be generated in the diffuser due to some absorption of incident device light. In embodiments, the diffuser system may comprise a (surface) diffuser. Especially, in embodiments, the diffuser may comprise an element comprising a light- diffusive material, such as e.g. a silica, ground glass, a polymeric material, a ceramic material, a metal(lic) material, a white material, and a rough-surfaced material. Further, in embodiments, the diffuser may comprise a diffractive optical element, such as e.g. a diffractive diffuser, or a holographic optical element, such as e.g. metasurfaces comprising multiple different sub-wavelength features at the surface of a substrate such as fused silica. The diffuser system may thus comprise a polarization converter and a (reflective) diffuser, wherein the diffuser system is configured such that linearly polarized device light received by the diffuser system undergoes the following modifications: (a) the device light passes through the polarization converter and gets converted to (first) elliptically polarized device light, (b) the (first) elliptically polarized device light arrives at the diffuser and gets diffused into elliptically polarized diffused device light, (c) the elliptically polarized diffused device light passes through the polarization converter and gets converted to (linearly polarized) diffused device light, especially wherein the device light and the diffused device light have complementary polarizations. For instance, the device light may be p-polarized and the diffused device light may be s-polarized. The polarization converter, especially the λ / 4 waveplate, may, in embodiments, thus be configured to convert device light received by the λ / 4 waveplate having a linear polarization into device light having a (first) elliptical polarization, especially a (first) circular polarization. At the diffuser, in embodiments, the 2023PF80536 14 device light having the (first) circular polarization may be diffused into diffused device light having a (second) elliptical polarization, especially a second circular polarization. Therefore, in embodiments, the λ / 4 waveplate may also be configured to convert diffused device light received by the λ / 4 waveplate (via the diffuser) and having the (second) elliptical polarization, especially the (second) circular polarization, into diffused device light having a linear polarization. Hence, the diffuser system may comprise an arrangement of a polarization converter and a diffuser; wherein the diffuser system is configured to diffuse at least part of the device light received by the diffuser system into diffused device light, wherein the diffused device light has a linear polarization different from the linear polarization of the device light received by the diffuser system. The term “linear polarized light” (or “linearly polarized light”) may herein refer to light having (electric field) 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 least 80% of (electric field) 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. As known in the art, linear polarized light may be generated by optical elements of solid state lasers, e.g., polarizing filters, laser cavity dimensional and / or structural characteristics, and / or intracavity elements. The linear polarizations s-polarized and p-polarized may be considered complementary polarizations (or orthogonal polarizations). Furthermore, in embodiments, the diffuser system may comprise a beam profiler. In embodiments, the beam profiler may be configured between the polarization converter and the diffuser (relative to the propagation of light through the system). The beam profiler may especially be configured to adapt a light radiance distribution of the diffused device light received by the beam profiler. Therefore, in embodiments, the beam profiler may, e.g., comprise an engineered diffuser, such as a top-hat diffuser or any other tailored intensity profile adjusting diffuser. Such embodiments may be beneficial as the beam profiler may allow for matching the radiance distribution of the diffused device light with the luminescent material light radiance distribution. Hence, the diffuser system may in embodiments be configured to diffuse first device light received by the diffuser system into diffused device light. As will be elucidated below, in specific embodiments wherein the third light generating device may be applied (in 2023PF80536 15 the diffuser channel), the diffuser system may in embodiments be configured to diffuse first device light and third device light received by the diffuser system into diffused device light. Phrases like “configured to diffuse first device light received by the diffuser system into diffused device light”, and similar phrases, may indicate that at least part of the first device light received by the diffuser system is converted into diffused device light. However, this does not exclude that some of the first device light received by the diffuser system may (effectively) be specularly reflected. Hence, especially, the diffuser system may convert first device light having a beam width with a specific full width half maximum to a beam of (diffused) light having a larger full width half maximum, especially when comparing the respective full widths at 10% of the maximum intensity. Note that in specific embodiments, wherein the third light generating device is available (see also below), the diffuser system may also be configured to diffuse third device light received by the diffuser system. Whether or not the diffuser system receives first device light and / or third device light may depend upon the (temporary) settings of the system during operation of the system. As indicated above, the light generating system may comprise optics. The term “optics” may especially refer to (one or more) optical elements. Hence, the terms “optics”and “optical elements” may refer to the same items. The optics may include one or more of(specular or surface textured) mirrors, reflectors, collimators, lenses, prisms, diffusers, phase plates, polarizers, diffractive elements, gratings, dichroics, selectively reflective and / or selectively transmissive optics, arrays of one or more of the afore-mentioned, etc. Alternatively or additionally, the term “optics” may refer to a holographic element or a mixing rod. In embodiments, the optics may include one or more of beam expander optics and zoom lens optics. See further above for examples of optics. In embodiments, the optics may comprise an integrator, like a “Koehler integrator” (or “Köhler integrator”). In specific embodiments, the optics may comprise one or more of a integrating (or “homogenizing”) 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 dichroic redirection optics or the second polarization redirection optics as defined above) along the same optical path to the light exit, and the optics may comprise a beam homogenizer configured upstream of the light exit and configured to combine and homogenize the received light and to provide (homogenized white) system light to the light exit. 2023PF80536 16 Especially, in embodiments the optics may comprise a first polarization based redirection optics (PBS1) and a central redirection optics (CBS). Embodiments of these are further explained below. The first polarization based redirection optics (PBS1) may especially at least have the function of (i) allowing at least part of the first device light, having a first linear polarization, propagating to a diffuser system, and (ii) allowing first device light diffused by the diffuser system and having a second linear polarization propagating further (via the optics) in an optical path to the light exit. Hence, in embodiments the first polarization based redirection optics (PBS1) may be (a) configured to transmit light having a first linear polarization and reflect light having a second linear polarization or may be (b) configured to reflect light having a first linear polarization and transmit light having a second linear polarization. Further, in embodiments the first polarization based redirection optics (PBS1) may be configured in an optical path between the first light generating device and the diffuser system. Yet, the light generating system may be configured such that the first device light reaching the first polarization based redirection optics (PBS1) comprises linear polarized light. Hence, the first device light may comprise linear polarized light and / or a polarizer may be configured downstream of the first light generating device and upstream of the first polarization based redirection optics (PBS1) such that the first device light reaching the first polarization based redirection optics (PBS1) comprises linear polarized light. In specific embodiments, the (above) phrase “light having a first linear polarization” in relation to the first polarization based redirection optics (PBS1) may refer to first device light only (when no third light generating device is available), and may in other specific embodiments, when a third light generating device is available, also refer to third device light (received by the first polarization based redirection optics (PBS1)). Above, the generation of diffused first device light is described. In order to make white light, it may be necessary to (a) divert part of the first device light to a luminescent material and / or (b) apply one or more further light generating devices which may be used to (i) irradiate a luminescent material and / or which (ii) may emit at wavelengths different from the first light generating device. In the present invention, in essentially all embodiments, dependent upon the operational mode first device light may be distributed over the luminescent material and the diffuser system, which may in embodiments provide diffused blue light and colored luminescent material light. For instance, with the polarization control system a part of the diffused first device light directed to the luminescent material may be controlled. In embodiments, the contribution may be selected between 0-100%. This 2023PF80536 17 range may be smaller would a partial polarizing beam splitter (as first polarization based redirection optics) be applied. Hence, in other embodiments the contribution may be selected between 0-50% or between 50-100%. Yet other embodiments, may also be possible. The polarization control system may, as further be described below, be based on (i) a rotatable polarizer, configured upstream of the central redirection optics (CBS) and / or (ii) a rotatable unit comprising (at least) the first light generating device, which may be rotatable relative to an optical axis of the output beam of the rotatable unit that is directed toward to central redirection optics (CBS). The control of the polarization of the diffused device light may (thus) be implemented as serval positions in the system (see also below). Therefore, in embodiments the polarization control system may be configured to control a polarization of diffused device light reaching the central redirection optics (CBS). The central red redirection optics (CBS) may especially be applied to (a) direct luminescent material light to the light exit and / or (b) direct diffused first device light, not directed to the luminescent material to the light exit. To this end, the redirection optics (CBS) may comprise a polarizing beam splitter (or polarizing beam combiner) and a dichroic beam splitter (or dichroic beam combiner). Amongst others, in embodiments the central redirection optics (CBS) may comprise an orthogonal arrangement of a polarization based redirection optics (CPBS) and a dichroic based redirection optics (CDBS). Especially, the polarization based redirection optics (CPBS) may be (a) configured to transmit light having a first linear polarization and reflect light having a second linear polarization or may be (b) configured to reflect light having a first linear polarization and transmit light having a second linear polarization. Further, especially the dichroic based redirection optics (CDBS) may be configured to reflect or transmit light in dependence of a spectral wavelength of the light. Especially, in embodiments the central redirection optics (CBS) may be configured in an optical path between the first polarization based redirection optics (PBS1) and the light exit. Further, in embodiments the central redirection optics (CBS) may be configured such that (a) in dependence of the polarization of light received by the central redirection optics (CBS), at least part of the light may be directed to the light exit and / or at least part of the light may be directed to the luminescent material, and (b) at least part of the luminescent material light may be directed to the light exit. Hence, in specific embodiments the central redirection optics (CBS) comprises an orthogonal arrangement of a polarization based redirection optics (CPBS) and a dichroic based redirection optics (CDBS); the polarization based redirection optics (CPBS) is (a) configured to transmit light having a first linear polarization and reflect 2023PF80536 18 light having a second linear polarization or is (b) configured to reflect light having a first linear polarization and transmit light having a second linear polarization; the dichroic based redirection optics (CDBS) is configured to reflect or transmit light in dependence of a spectral wavelength of the light; the central redirection optics (CBS) is configured in an optical path between the first polarization based redirection optics (PBS1) and the light exit; the central redirection optics (CBS) is configured such that (a) in dependence of the polarization of light received by the central redirection optics (CBS), at least part of the light is directed to the light exit and ( / or) at least part of the light is directed to the luminescent material, and (b) at least part of the luminescent material light is directed to the light exit. In embodiments, the term light in the phrase “at least part of the light” in the larger phrase of “in dependence of the polarization of light received by the central redirection optics (CBS), at least part of the light is directed to the light exit and ( / or) at least part of the light is directed to the luminescent material, may refer to first device light, but may in other embodiments also refer to second device light (when a second light generating device is applied) and / or to third device light (when a third light generating device is applied). As indicated above, in dependence of the polarization of light received by the central redirection optics (CBS), at least part of the light is directed in an optical path to the light exit. Hence, dependent upon the polarization of the diffused first device light, this light may be directed in an optical path to the light exit or to the luminescent material. Would the central redirection optics (CBS) receive second device light, in embodiments wherein the second light generating device is available, the central redirection optics (CBS) may direct this second device light in an optical path to the luminescent material and direct the thus generated luminescent material light in an optical path to the light exit. Would the central redirection optics (CBS) receive (essentially undiffused) third device light, in embodiments wherein the third light generating device is available, the central redirection optics (CBS) may direct this third device light in an optical path to a (third) diffuser system. However, would the central redirection optics receive diffused third device light, it may direct this third device light in an optical path to the light exit. Whereas in embodiments the first device light reaching the central redirection optics may especially be diffused device light (and be indicated as such), second device light reaching the central redirection optics (in its optical to the luminescent material) may essentially be undiffused (second) device light. In embodiments, third device light may only reach the central redirection optics as diffused device light (especially together with diffused first device light), or may reach the central redirection optics on its optical path to a diffuser 2023PF80536 19 system (and may essentially be undiffused (third) device light when reaching the central redirection optics on its optical path to a diffuser system). Hence, as indicated above, the central redirection optics (CBS) may be configured such that (a) in dependence of the polarization of light received by the centralredirection optics (CBS), at least part of the light is directed to the light exit and / or at leastpart of the light is directed to the luminescent material. For instance, part of the diffused first device light reaching the central redirection optics (CBS) may comprise a first linear polarization, and be directed in an optical path to the light exit, and another part of the diffused (first) device light may comprise a second linear polarization, and be directed to the luminescent material. The relative contributions may be controlled by the polarization control system. Further, in embodiments diffused third device light reaching the central redirection optics (CBS) may (also) comprise a first linear polarization, and be directed in an optical path to the light exit. As can be derived from the above, the term “light” in the phrase “in dependence of the polarization of light received by the central redirection optics (CBS)” may refer to one or more of diffused first device light, diffused second device light, third device light, and diffused third device light. The phrase “in an optical path” may refer to light propagating in an optical path from one item to another item. This may include passing, by transmission or reflection, of one or more other optical elements. For instance, first device light may in an optical path propagate to the diffuser system. That optical path may e.g. include lenses and the first polarization based redirection optics. As indicated above, the light generating system may especially be configured to generate system light. The system light may be white light or colored light. The spectralpower distribution of the system light may depend upon the choice of the first device light,the choice of the optional second device light, the choice of the optional third device light, the luminescent material, and the polarization control system. Especially, however, the system may be configured such that the system light in at least a first operational mode is white light, based on luminescent material light and diffused device light. Hence, in embodiments in a first operational mode of the light generating system the system light may be white light comprising at least part of the luminescent material light and at least part of the diffused device light. As indicated above, the light generating system may further comprise a control system. Especially, the control system may be configured to control a spectral power distribution of the system light. Especially, the control system may be configured to control a 2023PF80536 20 spectral power distribution of the system light by controlling the relative contributions of device light provided to the luminescent material and to the diffuser system. This may in embodiments be done by controlling the polarization control system (for instance rotation of one or more light generating devices and / or rotation of a birefringent rotator). 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. In particular, in embodiments, the control system may be configured to control the system light such, e.g. by controlling the polarization control system 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 system light, such as by controlling the polarization control system, such that the CCT may be altered from CCT1 in the first operational mode to CCT2 in the second operational mode, and vice versa. Further, in embodiments, CCT2-CCT1≥250 K, like CCT2-CCT1≥500 K, such as CCT2-CCT1≥750 K, like, CCT2-CCT1≥1000 K. Especially, in embodiments, CCT2- CCT1≥1500 K. Further, in embodiments, CCT2-CCT1 may be at most 5000 K, such as at most 3000 K, like at most 2500 K. 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 2023PF80536 21 control. The term “control system” may also refer to a plurality of different control systems, which especially are functionally coupled, and of which e.g. one control system may be a master control system and one or more others may be slave control systems. A control system may comprise or may be functionally coupled to a user interface. The control system may also be configured to receive and execute instructions from a remote control. In embodiments, the control system may be controlled via an App on a device, such as a portable device, like a Smartphone or I-phone, a tablet, etc.. The device is thus not necessarily coupled to the lighting system, but may be (temporarily) functionally coupled to the lighting system. The system, or apparatus, or device may execute an action in a “mode” or “operation mode” or “mode of operation” or “operational mode”. The term “operational mode may also be indicated as “controlling mode”. Likewise, in a method an action or stage, or step may be executed in a “mode” or “operation mode” or “mode of operation” or “operational mode”. This does not exclude that the system, or apparatus, or device may also be adapted for providing another controlling mode, or a plurality of other controlling modes. Likewise, this may not exclude that before executing the mode and / or after executing the mode one or more other modes may be executed. However, in embodiments a control system may be available, that is adapted to provide at least the controlling mode. Would other modes be available, the choice of such modes may especially be executed via a user interface, though other options, like executing a mode in dependence of a sensor signal or a (time) scheme, may also be possible. The 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. Especially, the device light initially received by the first polarization based redirection optics (PBS1) or initially received by the central redirection optics (CBS), such as the first device light propagating from the first light generating device to the first polarization based redirection optics (PBS1), or the third device light propagating from the third light generating device to the first polarization based redirection optics (PBS1), or the third device 2023PF80536 22 light propagating from the third light generating device to the central redirection optics (CBS), or the second device light propagating from the second light generating device to the central redirection optics (CBS), may have a relatively narrow angular power distribution. For instance, the full width half maximum may be at maximum 5°, such as at maximum about 2°. Hence, such device light may be relatively collimated. When applying polarizing beam splitters, dichroic beam splitters, or polarization rotators (see also below) best results may be obtained when the light reaching such polarizing beam splitter or dichroic beam splitter or polarization rotator may be relatively collimated. However, dependent upon the position in the system and the embodiment chosen, it may be that diffused device light reaches the polarizing beam splitter or dichroic beam splitter or polarization rotator. Hence, it may therefore be desirable to use device light that is relatively collimated and to apply diffusers upstream of such polarizing beam splitter or dichroic beam splitter or polarization rotator that are small-angle diffusers. Hence, in embodiments the polarization maintaining diffuser may comprise small-angle diffuse reflector, with a diffusion angle of at maximum 10°. Therefore, in embodiments the diffuser system may comprise an arrangement of a polarization converter and a polarization maintaining diffuser, wherein the polarization maintaining diffuser may comprise small-angle diffuse reflector, with a diffusion angle of at maximum 10°. The small-angle diffuse reflector may comprise a textured metal surface (or metallized textured surface), a meta surface, a diffractive surface, a holographic (volume) diffuser, a stack of a multi-lens array with a specular mirror, a stack of a small-angle transmissive diffusive material (e.g. a volume diffuser, textured surface diffuser, meta surface diffuser, …) with a specular mirror, a retroreflector array with some beam broadening properties, such as a cat-eye spheres array, etc. (see also above). Hence, in embodiments a small-angle reflective diffuser may be realized by a stack of a small-angle transmissive diffuser and a specular mirror. In embodiments, the term “diffusion angle” may refer to the (relatively smooth) broadening of an incident beam of radiation that may be characterized by the full width at half maximum of the diffused radiant angular intensity distribution for an incident (non-diffused) pencil beam (i.e., an incident beam of radiation with a negligible angular extent (FWHM) compared to the FWHM of the diffused beam). In further embodiments, the small-angle diffuse reflector may have a diffusion angle of at minimum 1°, such as at least about 1.5° (the diffusion angle of a specular reflector may thus be 0°). In embodiments, the system efficiency may be enhanced when a reflector element is configured to reflect light that may have otherwise been lost from the system (and thus not escape via the light exit). Such reflector element may be a specular mirror, but may 2023PF80536 23 in specific embodiments be a small-angle diffuse reflector (the latter may provide additional safety). In specific embodiments, the optics may (further) comprise a first reflector element,wherein the first polarization based redirection optics (PBS1), the central redirection optics(CBS), and the first reflector element may be configured such that at least part of light propagating, in an operational mode of the light generating system, from the central redirection optics (CBS) to the first polarization based redirection optics (PBS1), may at least partly be transmitted by the first polarization based redirection optics (PBS1) and reflected via the first reflector element (and transmitted (again) via the first polarization based redirection optics (PBS1)) back to the central redirection optics (CBS). Therefrom, it may propagate to the light exit and escape from the system. Likewise, would a small portion of first device light propagate from the first polarization based redirection optics (PBS1) to the first reflector element (as e.g. a small portion may not be transmitted but reflected), it may (also) be reflected via the first reflector element back to the first polarization based redirection optics (PBS1), where it may substantially be transmitted to the central redirection optics (CBS). Here below, some further embodiments of the system are described. In embodiments, the first polarization based redirection optics (PBS1) may be (a) at least 90% reflective for one of (i) s-polarized device light and (ii) p-polarized device light, and (b) at least 90% transmissive for the other one of (i) s-polarized device light and (ii) p-polarized device light. Hence, the first polarization based redirection optics (PBS1) may essentially split on the basis of polarization. In embodiments, the central redirection optics (CBS) may comprise a cube beam splitter comprising the orthogonal arrangement of a polarization based redirection optics (CPBS) and a dichroic based redirection optics (CDBS). A cube beam splitter may typically be a cube of a solid material such as glass (with, obviously internal interfaces taking care of the splitting). However, alternatively one may use two crossed thin plates, one PBS plate and one DBS plate, with a small imperfection at the crossing as one of them isinterrupted by the thickness of the other, i.e., at least one of them comprises two parts. In acube beam splitter, the four parts may be cut such that the imperfection at the connecting point of all these parts may be negligible (which is the case for infinitely sharp 90 degree edges and zero thickness of the interconnection layer, which can essentially be approached). Yet, in embodiments the dichroic based redirection optics (CDBS) may be (a) at least 90% transmissive or at least 90% reflective for the diffused device light and is (b) at least 90% reflective or at least 90% transmissive for at least part of the spectral distribution of 2023PF80536 24 the luminescent material light. Hence, this may in embodiments imply that essentially all diffused device light is transmitted and at least part of the luminescent material light isreflected by the dichroic based redirection optics (CDBS), and this may in otherembodiments imply that essentially all diffused device light is reflected and at least part of the luminescent material light is transmitted by the dichroic based redirection optics (CDBS). In specific embodiments, the dichroic based redirection optics (CDBS) may be (a) transmissive for at least part of the spectral power distribution of the diffused device light andreflective for at least part of the spectral distribution of the luminescent material light, or maybe (b) reflective for at least part of the spectral power distribution of the diffused device light and transmissive for at least part of the spectral distribution of the luminescent material light. For instance, in embodiments the dichroic based redirection optics (CDBS) may be (a) at least 90% transmissive for at a centroid wavelength of the spectral power distribution of the diffused device light and at least 90% reflective for the centroid wavelength of the spectral distribution of the luminescent material light, or may be (b) at least 90% reflective for at a centroid wavelength of the spectral power distribution of the diffused device light and at least 90% transmissive for the centroid wavelength of the spectral distribution of the luminescent material light. Further, in embodiments the polarization based redirection optics (CPBS) may be (a) at least 50% reflective for one of (i) s-polarized first device light (and (ii) p-polarized first device light), and (b) at least 50% transmissive for (the other one of (i) s-polarized first device light and (ii)) p-polarized first device light. Hence, the polarization based redirection optics (CPBS) may comprise a partial polarizing beam splitter, but may alternatively comprise a full polarizing beam splitter, wherein (at least 90% of the) s-polarized light is transmitted and (at least 90% of the) p-polarized light is reflected, or wherein (at least 90% of the) p-polarized light is transmitted and (at least 90% of the) s-polarized light is reflected. Such percentages herein may especially refer to the radiant flux. Further, in specific embodiments the polarization based redirection optics (CPBS) may be (a) at least 50% (such as at least 90%) reflective for s-polarized first device light, and at least 50% (such as at least 90%) transmissive for p-polarized first device light, or (b) at least 50% (such as at least 90%) transmissive for s-polarized first device light, and at least 50% (such as at least 90%) reflective for p-polarized first device light. In embodiments, the polarization based redirection optics may comprise apolarizing beam splitter, especially configured to transmit essentially all light having a first linear polarization and reflect light having a second linear polarization (or especially 2023PF80536 25 configured to reflect essentially all light having a first linear polarization and transmit light having a second linear polarization). However, in other embodiments, the polarization based redirection optics, may be a partial PBS. Further, in specific embodiments (see also above) the first light generating device is configured to provide first device light having a first centroid wavelength (λc1) selected from the wavelength range of 430-490 nm. Hence, the first device light may in embodiments comprise blue light. The optional second device light may also be blue light. The optional third device light may be blue light or red light, though other colors may also be selected (see also below). 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 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 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. 2023PF80536 26 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. 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 2023PF80536 27 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 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, 2023PF80536 28 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. 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 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 maycomprise a polymeric body, with luminescent material embedded therein. 2023PF80536 29 In specific embodiments, the luminescent material may be configured to convert at least part of the first device light received by the luminescent material into luminescent material light having spectral power, especially its centroid wavelength, in the green-yellow wavelength range. Hence, the luminescent material may have spectral power at one or more wavelengths in the wavelength range of 490-590 nm, such as a centroid wavelength in this wavelength range. The luminescent material may be configured in thermal contact with a thermally conductive material. 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. 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 yetfurther 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) 2023PF80536 30 luminescent material onto a rotating element, such as e.g. a rotating (phosphor-)wheel (or disk) or a rotating rod (or cylinder). Such embodiments may enable thermal spreading andcooling without the need for e.g. active water cooling, and thereby enabling maximumpossible irradiance values. Hence, in embodiments, the luminescent material may be configured onto a rotating element. In embodiments, the rotating element may be thermally conductive. 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 be white light having a correlated color temperature selected from the range of 2000-12000 K, such as from the range of 2700-10000 K, especially from the range of 6000-10000 K, such as a correlated color temperature selected from the range of 6000-8000 K. Additionally or alternatively, in embodiments, in an operational mode of the light generating system the system light may be white light having a color rendering index of at least 60, such as at least 65, like at least 70, especially at least 80. Such embodiments may especially be beneficial for application of the light generating system in entertainment (spot) lighting applications. The term “white light”, and similar terms, herein, is known to the person skilled in the art. It may especially relate to light having a correlated color temperature (CCT) between about 1800 K and 20000 K, such as between 2000 and 20000 K, especially 2700- 20000 K, for general lighting especially in the range of about 2000-7000 K, such as in the range of 2700 K and 6500 K. In embodiments, the correlated color temperature (CCT) may especially be in the range of about 7000 K and 20000 K. Yet further, in embodiments the correlated color temperature (CCT) is especially within about 15 SDCM (standard deviation of color matching) from the BBL (black body locus), especially within about 10 SDCM from the BBL, such as within 8 SDCM from the BBL, even more especially within about 5 SDCM 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 2023PF80536 31 light having a correlated color temperature selected from the range of 6000-10,000 K and a color rendering index of at least 65. In embodiments, the polarization control system may comprise a polarization rotator, especially a birefringent rotator (or especially a Faraday 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 optional the third light generating device) and may be configured to adjust (or control) the polarization of the device light, such that the (combined) first (and / or optional third) device light having a predetermined (linear) polarization will be provided to the central redirection optics (CBS). Especially, in embodiments, the polarization control system may be configured to control rotation of the birefringent rotator, such that the polarization of the device light reaching the central redirection optics (CBS) is adjusted. The birefringent rotator may therefore, in embodiments, comprise a λ / 2 waveplate, wherein the wavelength ‘λ’ refers to a representative wavelength of the incoming beam of the device light, with which, upon rotation about the optical axis (of the birefringent rotator), the polarization of the incoming(linearly polarized) beam of device light can be rotated by any angle. In embodiments, with aλ / 2 waveplate configured in an optical path between (a) the first (and / or optional third) light generating device(s) and (b) the central redirection optics (CBS), 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 central redirection optics (CBS), 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 central redirection optics (CBS). 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). 2023PF80536 32 Instead of a birefringent rotator, another optical retarder, providing a defined phase shift between the polarization components projected along the fast and slow axes of birefringent material may be used. For a λ / 4 phase shift, herein a zero-order waveplate. A same effect can be achieved with multiple order waveplates (integer+λ / 4 phase shift). Fresnel rhomb retarders may be also used to result in lambda / 4 phase shift. Faraday rotators are typically used to rotate direction of linear polarized light as well. Finally, metamaterials or metasurfaces, comprising geometric and repeating sub-wavelength structures can be designed to provide quarter wave retardation as well. Likewise, for λ / 2 waveplate alternatives may be applied. The polarization of the device light received by the first polarization redirection optics may further be controlled by controlling an orientation of the light generating devices, especially by controlling an orientation of the first light generating device (and / or 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 generating device relative to an optical axis of the (beam of light) directed to the central redirection optics (CBS), especially a rotational orientation around a (first) optical axis of the first device light, and (ii) an (rotational) orientation of the third device relative to an optical axis of the (beam of light) directed to the central redirection optics (CBS), 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 distribution of the system light by controlling one or more of (i) an orientation of the first light generating device relative to an optical axis of the (beam of light) directed to the central redirection optics (CBS), and (ii) an orientation of the third device relative to an optical axis of the (beam of light) directed to the central redirection optics (CBS). Especially, in embodiments the polarization of the device light received by the central redirection optics (CBS) may (further) be controlled by controlling an orientation of an arrangement comprising (a) the first light generating device and optional third light generating device, (b) the first polarization based redirection optics (PBS1), (c) the diffuser system (configured to diffuse first device light (and optionally third device light) received by the diffuser system into diffused device light and (d) optical elements configured in the optical paths between at least two of the aforementioned elements. The arrangement may be a rotational element. 2023PF80536 33 Hence, in embodiments the light generating system, especially the polarization control system, may comprise a movement element, especially a rotational element. The rotational element may comprise the first light generating device and / or the optional third light generating device, and in specific embodiments the rotational element may comprise the above-mentioned arrangement. The rotational element may be configured to control a rotational orientation of the light generating device(s) relative to central redirection optics (CBS). In particular, the rotational element may be configured to control a (linear) polarization of device light received by the central redirection optics (CBS). Especially, in embodiments, the polarization control system may be configured such that of first and optional third device light traveling from the first polarization based redirection optics (PBS1) and received by the central redirection optics (CBS), x1% comprises a first linear polarization and y1% comprises a second linearpolarization. In embodiments, x1 and y1 may be selected from the range of 0-100%, such asfrom the range of 10-90%, like from the range of 20-80% (with especially y1% = 100% - x1%). The polarization control system may thus be configured such that the (combined) first and optional third device light provided to the central redirection optics (CBS) 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 central redirection optics (CBS) 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. Hence, in embodiments, the first device light and the third device light reaching the first polarization based redirection optics (PBS1), especially the first polarizing beam splitter, may comprise linear polarized light. In further embodiments, especially in an operational mode, (at least part of) the first device light and the optional third device light reaching the first polarization redirection optics may comprise p-polarized light. Additionally or alternatively, in the operational mode, (at least part of) the first device light and the optional third device light reaching the first polarization redirection optics may comprise s- polarized light. Assuming a polarization rotator, such as a birefringent rotator, the polarization rotator may be configured at different positions in the system, which are all upstream of the central redirection optics (CBS) (i.e. in the optical path of the first device light and / or optional third device light propagating to the central redirection optics (CBS). In embodiments the polarization rotator may be configured in the optical path between the first 2023PF80536 34 polarization redirection optics and the central redirection optics (CBS) and in other embodiments the polarization rotator may be configured in the optical path between first light generating device and the first polarization redirection optics (or in the optical path between the optional third light generating device and the first polarization redirection optics). Hence, in embodiments the polarization control system may comprise a polarization rotator configured downstream of the first polarization based redirection optics (PBS1) and upstream of the polarization based redirection optics (CPBS), wherein the control system may be configured to control the spectral power distribution of the system light by controlling (a rotation of) the polarization rotator, wherein the polarization rotator may especially comprise a birefringent rotator, wherein the birefringent rotator may comprise a λ / 2 waveplate. Especially, the polarization control system may be configured to control rotation of the birefringent rotator (and the control system may control the polarization control system). Note that controlling radiant fluxes of the light generating devices is herein not excluded. However, in other embodiments, the polarization control system may comprise a polarization rotator configured downstream of the first light generating device and upstream of the first polarization based redirection optics (PBS1), wherein the control system may be configured to control the spectral power distribution of the system light by controlling (a rotation of) the polarization rotator, wherein the polarization rotator may especially comprise a birefringent rotator, wherein the birefringent rotator may comprises a λ / 2 waveplate. Especially, the polarization control system may be configured to control rotation of the birefringent rotator (and the control system may control the polarization control system). Note that controlling radiant fluxes of the light generating devices is herein not excluded. In yet other embodiments, as also indicated above, a movement device may be applied to move, such as rotate, the first light generating device, and optionally other elements comprised by the light generating system. Hence, in embodiments the polarization control system may comprise a movement device, wherein the movement device mayespecially be configured to control an orientation of the first light generating device relativeto the first polarization based redirection optics (PBS1). Yet, the control system may be configured to control the spectral power distribution of the system light by controlling the movement device. When only a first light generating device is applied, there may be a single diffuser system. When a second light generating device is applied, there may be a single diffuser system, as the second light generating device may especially be applied to provide 2023PF80536 35 second device light to the luminescent material. However, in other embodiments, part of the second device light may (in the first operational mode) propagate to another diffuser system. Hence, when a second light generating device is applied, there may in embodiments be two diffuser systems. When a third light generating device is applied (whether or not a second light generating device is applied), there may be a single diffuser system, as its third device light may (in the first operational mode) propagate to the same diffuser system as the first device light propagates to. However, in other embodiments, when a third light generating device is applied, there may be a first diffuser system configured to diffuse first device light received by that first diffuser system and there may be a second diffuser system configured to diffuse third device light received by that second diffuser system. Note that instead of the above-mentioned first reflector element, it may also be possible to configure a diffuser system. In such embodiments, there may especially be at least two diffuser systems. Hence, in embodiments the light generating system may comprise two diffuser systems (and thus optionally more than two diffuser system), wherein the two diffuser systems may be configured to diffuse first device light(and optionally third device light, see elsewhere herein) received by the diffuser system into diffused device light, wherein the first polarization based redirection optics (PBS1) may be configured to direct the first device light received by the first polarization based redirection optics (PBS1) in dependence of its polarization to a respective diffuser system of the two diffuser systems. Such embodiments may especially be relevant when the polarization control system is configured to rotate the first light generating device only (i.e. no other light generating devices if available) or when the polarization control system is configured to control a polarization rotator (or especially a movement device configured to control an orientation (especially a rotation) of the polarization rotator (especially a λ / 2 waveplate)). Further, it may be desirable to apply a small-angle transmissive integrator, such as a small-angle transmissive diffuser, downstream of the first light generating device, but upstream of the first polarization based redirection optics. Would a second light generating device be applied, it may also be desirable to apply a small-angle transmissive diffuser downstream of the second light generating device and (at least) upstream of the central redirection optics. Would a third light generating device be applied, it may also be desirable to apply a small-angle transmissive diffuser downstream of the third light generating device and (at least) upstream of the central redirection optics, and when the third light generating device is configured upstream of the first polarization based redirection optics, then upstream of that first polarization based redirection optics. Hence, in 2023PF80536 36 embodiments the light generating system may further comprise a small-angle transmissive diffuser, with a diffusion angle of at maximum 10°, configured downstream of the first light generating device and upstream of the first polarization based redirection optics (PBS1). As indicated above, such small-angle transmissive diffuser may (also) be applied downstream of the optional second light generating device and / or downstream of the optional third light generating device. With reference to the above, the small-angle transmissive diffuser may transform a normally (i.e., perpendicular) incident pencil beam into a transmitted diffused beam with a FWHM angular radiant intensity distribution of at least 1 degree and at max 10°. Instead of or in addition to the small-angle transmissive diffuser, other small-angle transmissive integrators may be applied, like one or more of a light pipe, a multi lens array, a multi lens array pair, etc. Hence, especially the small-angle transmissive integrator, such as a small-angle transmissive diffuser, may transform a normally (i.e., perpendicular) incident pencil beam into a transmitted diffused beam with a FWHM angular radiant intensity distribution of at least 1 degree and in embodiments at max 10°. As indicated above, the system may further comprise a second light generating device. Analogously to the first light generating device, in embodiments, 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 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 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. In general, this second light generating device may be configured to provide second device light to the luminescent material. Hence, during operation of the second light generating device, less than 5% of its spectral power, such as at maximum 2%, or even less, like less than 1%, may reach at the diffuser system(s) that may receive first device light or 2023PF80536 37 optionally third device light. A substantial part, such as at least 50%, like over 70%, or even at least 80% of its spectral power may be received by the luminescent material. In specific embodiments, the second device light may comprise, more especially, may be blue light. Hence, in embodiments the light generating system may further comprise a second light generating device, wherein the second light generating device is configured to provide second device light having a second centroid wavelength (λc2) selected from the wavelength range of 430-490 nm. In specific embodiments, |λc1-λc2| ≤ 50 nm. Further, in specific embodiments |λc1-λc2| = 0 nm. Note that in embodiments part of the first device light may thus reach the luminescent material and a substantial part of the second device light may reach the luminescent material. The second light generating device may be configured at different positions, dependent upon the embodiment. Amongst others, the following embodiments may be possible. In a first line of embodiments, the central redirection optics (CBS) may be configured in an optical path between the second light generating device and the luminescent material. Especially, the central redirection optics (CBS) may be configured such that second device light is directed to the luminescent material and luminescent material light, generated by one or more of the first device light and the second device light, is directed to the lightexit. In a second line of embodiments, the light generating system may further (also)comprise a second polarization based redirection optics (PBS2) configured in an optical path between the central redirection optics (CBS) and the luminescent material, wherein the second light generating device is configured upstream of the second polarization based redirection optics (PBS2), wherein the second polarization based redirection optics (PBS2) and the central redirection optics (CBS) are configured such that second device light may be directed to the luminescent material. Further, luminescent material light, generated by one or more of the first device light and the second device light, may be directed to the light exit (via the second polarization based redirection optics (PBS2) and the central redirection optics (CBS), respectively). As indicated above, the first device light may comprise linear polarized light and / or a polarizer may be configured downstream of the first light generating device and upstream of the first polarization based redirection optics (PBS1) such that the first device light reaching the first polarization based redirection optics (PBS1) comprises linear polarized light. Likewise, the second device light may comprise linear polarized light and / or a polarizer may be configured downstream of the second light generating device and upstream of the central redirection optics and / or upstream of a beam combiner (when second 2023PF80536 38 device light and third device light may be combined with a (dichroic based) beam combiner or a geometric beam combiner). Likewise, the third device light may comprise linear polarized light and / or a polarizer may be configured downstream of the third light generating device and upstream of the central redirection optics and / or upstream of a (dichroic based or polarization based, or geometric based) beam combiner (dependent upon the embodiments). In embodiments, one of the following may apply: (a) both the first device light reaching the first polarization based redirection optics (PBS1), and the second device light reaching the central redirection optics (CBS) comprise p-polarized light, or (b) the first device light reaching the first polarization based redirection optics (PBS1) comprises s- polarized light, and the second device light reaching the central redirection optics (CBS) comprises p-polarized light, or (c) the first device light reaching the first polarization based redirection optics (PBS1) comprises both p-polarized light and s-polarized light, and the second device light reaching the central redirection optics (CBS) comprises s-polarized light or p-polarized light. However, in (other) embodiments, one of the following may apply: (d) the first device light reaching the first polarization based redirection optics (PBS1) comprises p-polarized first device light, and second device light reaching the central redirection optics (CBS) comprises s-polarized second device light, or (e) the first device light reaching the first polarization based redirection optics (PBS1) comprises s-polarized first device light, and second device light reaching the central redirection optics (CBS) comprises s-polarized second device light. Other embodiments, however, are herein not excluded. As indicated above, also a third light generating device may be applied. The third light generating device may be configured to generate third device light. Therefore, in embodiments, the third light generating device may comprise a third light source. The third light source may be essentially any light source, see also further below. Especially, in embodiments, the (third light source of the) third light generating device may comprise a third solid state light source. Hence, in embodiments, the third light generating device may comprise one or more of a laser diode, a superluminescent diode, and a stacked multi- junction light-emitting diode (LED). The third light generating device may herein also comprise a plurality of third (solid state) light sources. Especially, in specific embodiments, the third light generating device may comprise a third laser bank comprising a plurality of third lasers. Further, in embodiments, the third light generating device may especially be configured to generate third device light having a third centroid wavelength (λc3). Especially, 2023PF80536 39 in embodiments, the third device light may have a third centroid wavelength (λc3) selected from the wavelength range of 430-500 nm, such as from the range of 440-490 nm, like from the range of 445-480 nm. In further embodiments, the third device light may have a third centroid wavelength (λc3) selected from the wavelength range of 400-500 nm, such as from the range of 400-490 nm, especially from the range of 430-490 nm. Hence, in embodiments, the third device light may be blue light. However, the third centroid wavelength (λc3) may also be selected from the wavelength range of 400-780 nm (see further also below), such as selected from the wavelength range of 590-780 nm, especially selected from the wavelength range of 590-680 nm. Hence, the light generating system may further comprise a third light generating device, wherein the third light generating device is configured to provide third device light having a third centroid wavelength (λc3). The third light generating device may in embodiments be comprised by the system while also the second light generating device is comprised by the system, but third light generating device may in other embodiments be comprised by the system while the second light generating device is not comprised by the system. The third light generating device may in embodiments be configured as additional source of blue light for the system light but may in other embodiments be configured as additional source of pump light for the luminescent material. However, in yet other embodiments the third light generating device be configured as additional source of light for the system light, wherein the third device light of the third light generating device may comprise one or more of green, yellow, orange, and red light, especially one or more of orange and red light. Especially, in embodiments the third device light may either have a centroid wavelength in the blue wavelength range, or in the orange-red wavelength range. The third device light may be dichroically combined with the first device light, when the centroid wavelengths differ. Likewise, the third device light may be dichroicallycombined with the second device light, when the centroid wavelengths differ. As the thirddevice light may be coupled to the first device light, it may be desirable when the centroid wavelengths are not too different. Likewise, as the third device light may be coupled to thesecond device light, it may be desirable when the centroid wavelengths are not too different.However, when the third light generating device be configured as additional source of light for the system light, a difference in centroid wavelength with the first device light and / or a difference in centroid wavelength with the second device light may e.g. be at least 30 nm, such as at least 40 nm, or even substantially more, such as more than 50 nm, or even more than 60 nm. Hence, in embodiments one of the following may apply (when a first light generating device, a second light generating device, and third light generating device are 2023PF80536 40 available): (a) the third centroid wavelength (λc3) may be selected from the wavelength range of 430-490 nm, and |λc2-λc3| ≤ 50 nm, and (b) the third centroid wavelength (λc3) may be selected from the wavelength range of 590-780 nm, and |λc2-λc3| > 50 nm. Further, in embodiments wherein only the first light generating device and the third light generating device are available one of the following may apply: (a) the third centroid wavelength (λc3) may be selected from the wavelength range of 430-490 nm, and |λc1-λc3| ≤ 50 nm, and (b) the third centroid wavelength (λc3) may be selected from the wavelength range of 590-780 nm, and |λc1-λc3| > 50 nm, more especially ≥ 100 nm. Hence, in embodiments the light generating system may be configured such the first device light and the third device light are dichroically combined via a first dichroic based redirection optics (DBS1) configured upstream of the first polarization based redirection optics (PBS1), wherein especially |λc1-λc3| ≥ 5 nm, such as |λc1-λc3| ≥ 10 nm; especially, |λc1-λc3| ≤ 50 nm. In yet other embodiments, the light generating system may be configured such that the second device light and the third device light are dichroically combined via a first dichroic based redirection optics (DBS1) configured upstream of the central redirection optics (CBS), wherein especially |λc2-λc3| ≥ 5 nm, such as |λc2-λc3| ≥ 10 nm; especially, |λc2-λc3| ≤ 50 nm. In a specific line of embodiments, the first dichroic redirection optics may be arranged in a (direct or indirect) light-receiving relationship with the first light generating device and with the third light generating device, i.e., the first light generating device and the third light generating device may be configured to provide (first and third) device light to the first dichroic redirection optics, optionally via one or more optical elements (see also below). The first light generating device and the third light generating device may especially be configured to provide the first device light and the third device light to the first dichroic redirection optics at a mutual angle of (about) 90º, i.e., the optical paths of the first device light and the third device light may, (directly) upstream of the first dichroic redirection optics, have a mutual angle selected from the range of 80º-100º, especially from the range of 85º-95º, such as a mutual angle of (about) 90º. The first dichroic redirection optics may be configured to combine received first device light and third device light, i.e., to combine the first device light and the third device light received by the first dichroic redirection optics. Hence, (directly) downstream of the first dichroic redirection optics, the optical paths of the first device light and the third device light may be oriented in essentially the same direction. In particular, in embodiments, the first dichroic redirection optics may be configured to (a) transmit first device light and to reflect third device light, i.e., to transmit light having a first 2023PF80536 41 centroid wavelength λc1and to reflect light having a third centroid wavelength λc3, or (b) to reflect first device light and to transmit third device light, i.e., to reflect light having a first centroid wavelength λc1 and to transmit light having a third centroid wavelength λc3. In further embodiments, the first dichroic redirection optics may, assuming irradiation with the received light at an average angle of incidence relative to a surface normal of the redirecting plane (of the redirection optics) of about 45°, be (i) at least 90% transmissive for (device light having) one of the first centroid wavelength (λc1) and the third centroid wavelength (λc3), and (ii) at least 90% reflective for (device light having) the other one of the first centroid wavelength (λc1) and the third centroid wavelength (λc3). In another specific line of embodiments, the first dichroic redirection optics may be arranged in a (direct or indirect) light-receiving relationship with the second light generating device and with the third light generating device, i.e., the second light generating device and the third light generating device may be configured to provide (second and third) device light to the first dichroic redirection optics, optionally via one or more optical elements (see also below). The second light generating device and the third light generating device may especially be configured to provide the second device light and the third device light to the first dichroic redirection optics at a mutual angle of (about) 90º., i.e., the opticalpaths of the second device light and the third device light may, (directly) upstream of the firstdichroic redirection optics, have a mutual angle selected from the range of 80º-100º, especially from the range of 85º-95º, such as a mutual angle of (about) 90º. The first dichroic redirection optics may be configured to combine received second device light and third device light, i.e., to combine the second device light and the third device light received by the first dichroic redirection optics. Hence, (directly) downstream of the first dichroic redirection optics, the optical paths of the second device light and the third device light may be oriented in essentially the same direction. In particular, in embodiments, the first dichroic redirection optics may be configured to (a) transmit second device light and to reflect third device light, i.e., to transmit light having a second centroid wavelength λc2 and to reflect light having a third centroid wavelength λc3, or (b) to reflect second device light and to transmit third device light, i.e., to reflect light having a second centroid wavelength λc2and to transmit light having a third centroid wavelength λc3. In further embodiments, the first dichroic redirection optics may, assuming irradiation with the received light at an average angle of incidence relative to a surface normal of the redirecting plane (of the redirection optics) of about 45°, be (i) at least 90% transmissive for (device light having) one of the second centroid wavelength (λc2) and 2023PF80536 42 the third centroid wavelength (λc3), and (ii) at least 90% reflective for (device light having) the other one of the second centroid wavelength (λc2) and the third centroid wavelength (λc3). In yet other embodiments, the light generating system may further comprise the second polarization based redirection optics (PBS2) as described herein, wherein the third light generating device may be configured upstream of the second polarization based redirection optics (PBS2), and wherein the light generating system comprises two or three diffuser systems. Especially, the second polarization based redirection optics (PBS2) and the central redirection optics (CBS) may be configured to direct the third device light to one of the afore-mentioned one or two diffuser systems or to a third diffuser system. In specific embodiments, one or two diffuser systems of the two or three diffuser systems may be configured to diffuse first device light received by the one or two diffuser systems. Yet, in specific embodiments one of the two or three diffuser systems may be configured to diffuse third device light received by said diffuser system, into diffused device light. Further, especially in (such) embodiments the optics may be configured to direct the diffused device light generated by the two or three diffuser systems to the light exit. The light generating system may be configured to control the spectral power distribution of the system light by controlling the polarization control system. Alternatively or additionally, the light generating system may be configured to control the spectral power distribution of the system light by controlling the radiant fluxes of one or more of (i) the first light generating device, and (ii) at least one of the second light generating device and third light generating device. This may imply that in embodiments wherein only the first light generating device is available, the spectral power distribution of the system light may only be controlled via the polarization control system. Hence, in embodiments the control system may (also) be configured to control the spectral power distribution of the system light by controlling radiant fluxes of one or more light generating devices (110,120,130) (i.e. especially by controlling radiant fluxes of one or more light generating devices selected from (i) the first light generating device, and (ii) at least one of the second light generating device and third light generating device. As mentioned above, the first device light, the second device light and the third device light may, in embodiments, all be blue light. In embodiments, the first centroid wavelength (λc1), the second centroid wavelength (λc2), and the third centroid wavelength (λc3) may (each) be individually selected from the wavelength range of 400-500 nm, such as from the range of 400-490 nm, especially from the range of 440-490 nm, such as from the range of 430-490 nm, especially from the range of 445-470 nm. In other embodiments, this 2023PF80536 43 may only apply to the first device light and the second device light, and the third centroid wavelength (λc3) may (each) be selected from the wavelength range of 500-780 nm. As indicated above, the light generating system may comprise optics. The optics may, in embodiments, comprise redirection optics. Especially, in embodiments, the redirection optics may comprise one or more dichroic based redirection optics and / or one or more polarization based redirection optics, and / or one or more geometric beam combiner based redirection optics. Dichroic based redirection optics may (be configured to) redirect received light in dependence of the spectral power (distribution) of the light, especially based on the wavelengths of the light. Polarization based redirection optics may (be configured to) redirect received light in dependence of the polarization of the light. In embodiments, the redirection optics may comprise dichroic based redirection optics. In embodiments, the first dichroic based redirection optics may comprise a dichroic beam splitter. A dichroic beam splitters may especially be configured to split light received by the dichroic beam splitter and having different wavelengths into separate beams of light propagating in orthogonal directions relative to each other. The dichroic beam splitter may especially do so upon irradiation at an about 45° angle. Herein, in embodiments, a dichroic beam splitter may comprise one or more of a (flat or tile-shaped) dichroic mirror (e.g. a flat plat or tile comprising a dichroic coating), a dichroic cube (e.g. a cube comprising a diagonally oriented internal plane comprising a dichroic coating), and a dichroic sphere (e.g. a sphere comprising a cross-sectional internal plane comprising a dichroic coating). Additionally or alternatively, in embodiments, a dichroic beam splitter may be configured to combine light received by the dichroic beam splitter from orthogonal beams of light and having different wavelengths into a same optical path. As mentioned above, the redirection optics may (further) comprise polarization redirection optics. Especially, in embodiments, the redirection optics may comprise first polarization redirection optics and second polarization redirection optics. In embodiments, a polarization redirection optics may comprise a polarizing beam splitter. As will be known to the person skilled in the art, polarizing beam splitters may be configured to split light received by the polarizing beam splitter into orthogonal beams of light having different (orthogonal) polarization. The polarizing beam splitter may especially do so upon irradiation at an about 45° angle. Additionally or alternatively, polarizing beam splitters may be configured to combine light received by the polarizing beam splitter from 2023PF80536 44 orthogonal beams of light and having different (orthogonal) (linear) polarizations into a same optical path. It will be clear to the person skilled in the art that the reflectance and transmittance of an optical element, such as of a beam splitter, may depend on the angle of incidence of device light on the optical element. The values for reflectance and transmittance of an optical element, especially of a beam splitter, with respect to device light may herein specifically refer to the reflectance and transmittance as occurring when 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 term “beam splitter” may herein thus also refer to a beam combiner. Herein, the phrase “an element configured to combine X and Y into a same optical path” and similar phrases may refer to the respective beams of light being provided (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. Besides the polarization and dichroic redirection optics, further optics may be used to (re-)orient and (eventually) combine the device light, such as reflectors. Specular reflectors may be particularly suitable. As beams of light emitted from such (multi-chip packages and / or) laser banks may comprise multiple narrow laser beams, each individual laser beam may represent a hot spot in the beam of device light. Focusing of such a beam of device light on e.g. a luminescent material may exceed the maximum tolerable local irradiance and result in damage to the luminescent material, or other materials present in the luminescent material arrangement. Therefore, in embodiments, homogenizing optics may be applied and may especially be configured between (relative to the propagation of light through the system) the light generating devices (contributing to irradiation of the luminescent material) and (collimating optics of) the luminescent material. Similarly, in embodiments, homogenizing optics may be configured between (relative to the propagation of light through the system) the light generating devices (contributing to irradiation of the diffuser) and (collimating optics of) the diffuser. In further embodiments, the homogenizing optics may e.g. comprise 2023PF80536 45 one or more of a transmissive volume diffuser, a transmissive surface diffuser, a reflective surface diffuser, a transmissive or reflective diffractive optical element, a transmissive holographic optical element, a single multi lens array, a double multi lens array such as a fly- eye lens array, or an integrating polygonal light pipe that may be either solid (with propagation in the integrator based on total internal reflection) or hollow (with propagation in the integrator based on specular reflection). In further embodiments, the optics may comprise (at least) condensing optics. The condensing optics may especially comprise a first condensing optics configured (directly) upstream of the luminescent material and a second condensing optics configured (directly) upstream of the diffuser. Especially, in embodiments, the first condensing optics and the second condensing optics may each comprise at least one positive lens. In specific embodiments (such as e.g. when the luminescent material is configured in a reflective mode) the first condensing optics may comprise a first positive lens and a second smaller positive lens. In such embodiments, the smaller positive lens may especially be located between (relative to the propagation of light through the system) the first positive lens and the luminescent material or diffuser, respectively. In further embodiments, the optics may comprise (at least) collimator optics (or “collimating optics”), especially collecting and collimating optics. Especially, the optics may comprise a first collecting and collimating optics configured (directly) downstream of the luminescent material and a second collecting and collimating optics configured (directly) downstream of the diffuser. Especially, in embodiments, the first collecting and collimating optics and the second collecting and collimating optics may each comprise at least one positive lens, especially at least two positive lenses. In embodiments, the collimating optics and / or condensing optics, especially the lenses, may comprise glass materials, such as e.g. N- BK7, H-K51, B270, or fused silica (FS). The latter shows relatively low absorption and relatively low induced stress, but also has a relatively low refractive index. Therefore, if FS is used for all the lenses, in embodiments, the condensing optics for the reflective mode may preferably comprise three lenses. As 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 2023PF80536 46 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. 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 an operational mode. Especially, in the operational mode, the light generating system may be configured to provide system 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. As described above, the light generating system may comprise 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. 2023PF80536 47 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 light source may have a light escape surface. For LED’s it may for instance be the LED die, or when a resin is applied to the LED die, the outer surface of the resin. In principle, it may also be the terminal end of a fiber. The term escape surface especially relates to that part of the light source, where the light actually leaves or escapesfrom the light source. The light source is configured to provide a beam of light. This beam oflight (thus) escapes from the light exit surface of the light source. Likewise, a light generating device may comprise a light escape surface, such as an end window. Further, likewise a light generating system may comprise a light escape surface, such as an end window. The term “light source” may refer to a semiconductor light-emitting device, such as a light emitting diode (LEDs), a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSELs), an edge emitting laser, etc... The term “light source” may also refer to an organic light-emitting diode (OLED), such as a passive-matrix (PMOLED) or an active-matrix (AMOLED). In a specific embodiment, the light source comprises a solid-state light source (such as an LED or laser diode). In an embodiment, the light source comprises an LED (light emitting diode). The terms “light source” or “solid state light source” may also refer to a superluminescent diode (SLED). The term “light source” may also relate to a plurality of (essentially identical (or different)) light sources, such as 2-2000 solid state light sources (such as LEDs or laser diodes (or “diode lasers”)).Hence, the term LED may also refer to a plurality of LEDs. In embodiments, the light source may comprise one or more micro-optical elements (array of micro lenses) downstream of a single solid-state light source, such as an LED, or downstream of a plurality of solid-state light sources (i.e. e.g. shared by multiple LEDs). In embodiments, the light source may comprise an LED with on-chip optics. In embodiments, the light source comprises pixelated single LEDs (with or without optics) (offering in embodiments on-chip beam steering). In embodiments the light source may comprise a laser light source. The term “laser light source” may also refer to a plurality of (different or identical) laser light sources. In this way, a higher brightness may be obtained. In embodiments, laser light sources may be arranged in a laser bank (see also above). The laser bank may in embodiments comprise heat 2023PF80536 48 sinking and / or optics e.g. a lens to collimate the laser light. Hence, in embodiments lasers in a laser bank (or “laser array bank”) may share the same optics. The term “laser light source” may herein especially refer to a laser. Such laser may especially be configured to generate laser light source light having one or morewavelengths in the UV, visible, or infrared, especially having a wavelength selected from thespectral 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 a laser diode (or diode laser). In embodiments, the terms “laser” or “solid state laser” or “solid state material laser” may refer to one or more of a semiconductor laser diodes (may also be indicated as “laser diodes” or diode lasers”), such as GaN, InGaN, AlGaInP, AlGaAs, InGaAsP, lead salt, vertical cavity surface emitting laser (VCSEL), quantum cascade laser, hybrid silicon laser, etc. Especially, the term “solid state material laser”, and similar terms, may refer to a solid state laser like based on a crystalline or glass body doped with ions, like transition metal ions and / or lanthanide ions, to a fiber laser, to a photonic crystal laser, to a semiconductor laser, such as e.g. a vertical cavity surface-emitting laser (VCSEL), etc. The laser light source may be configured to generate laser light source light (or “laser light”). The light source light may essentially consist of the laser light source light. The light source light may also comprise laser light source light of two or more (different or identical) laser light sources. For instance, the laser light source light of two or more (different or identical) laser light sources may be coupled into a light guide, to provide a single beam of light comprising the laser light source light of the two or more (different or identical) laser light sources. In specific embodiments, the light source light is thus especially collimated light source light. In yet further embodiments, the light source light is especially (collimated) laser light source light. The laser light source light may in embodiments comprise one or more bands, having band widths as known for lasers. In specific embodiments, the band(s) may be relatively sharp line(s), such as having full width half maximum (FWHM) in the range of less than 20 nm at RT, such as equal to or less than 10 nm. Hence, the light source light has aspectral power distribution (intensity on an energy scale as function of the wavelength) whichmay comprise one or more (narrow) bands. 2023PF80536 49 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 thediscrete 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). As indicated above, in embodiments, the light generating system may comprise laser banks. A light-emitting diode (LED), such as e.g. a single-junction light emitting diode or multi-junction light-emitting diode, is especially a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor may recombine with electron holes, releasing energy in the form of photons. The color of the light (corresponding to the energy of the photons) may be determined by the energy required for electrons to recombine with electron holes. 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. 2023PF80536 50 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 housingenclosing the light generating system. The lamp or luminaire may comprise a light window inthe housing or a housing opening, through which the system light may escape from the housing. In yet a further aspect, the invention also provides a projection device comprising the light generating system as defined herein. Especially, a projection device or “projector” or “image projector” may be an optical device that projects an image (or moving images) onto a surface, such as e.g. a projection screen. The projection device may include one or more light generating systems such as described herein. Hence, in an aspect the invention also provides a lighting device selected from the group of a lamp, a luminaire, a projector device, a disinfection device, a photochemical reactor, and an optical wireless communication device, comprising the light generating system as defined herein. The lighting device may comprise a housing or a carrier, configured to house or support, one or more elements of the light generating system. The terms “upstream” and “downstream” relate to an arrangement of items or features relative to the propagation of the light from a light generating means (here the especially the light source), wherein relative to a first position within a beam of light from the light generating means, a second position in the beam of light closer to the light generating means is “upstream”, and a third position within the beam of light further away from the light generating means is “downstream”. The light generating system may be part of or may be applied in e.g. office lighting systems, household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive applications, (outdoor) road lighting systems, urban lighting systems, green house lightingsystems, horticulture lighting, digital projection, or LCD backlighting. The light generating 2023PF80536 51 system (or luminaire) may be part of or may be applied in e.g. optical communication systems or disinfection systems. The terms “visible”, “visible light” or “visible emission” and similar terms refer to light having one or more wavelengths in the range of about 380-780 nm. Herein, UV may especially refer to a wavelength selected from the range of 190-380 nm, such as 200-380 nm. Herein, IR (infrared) may especially refer to radiation having a wavelength selected from the range of 780-3000 nm, such as 780-2000 nm, e.g. a wavelength up to about 1500 nm, like a wavelength of at least 900 nm, though in specific embodiments other wavelengths may also be possible. The terms “light” and “radiation” are herein interchangeably used, unless clear from the context that the term “light” only refers to visible light. The terms “light” and “radiation” may thus refer to UV radiation, visible light, and IR radiation. In specific embodiments, especially for lighting applications, the terms “light” and “radiation” refer to (at least) visible light. The terms “violet light” or “violet emission”, and similar terms, may especially relate to light having a wavelength in the range of about 380-440 nm. In specific embodiments, the violet light may have a centroid wavelength in the 380-440 nm range. The terms “blue light” or “blue emission”, and similar terms, may especially relate to light having a wavelength in the range of about 440-490 nm (including some violet and cyan hues). In specific embodiments, the blue light may have a centroid wavelength in the 440-490 nm range. The terms “green light” or “green emission”, and similar terms, may especially relate to light having a wavelength in the range of about 490-560 nm. In specific embodiments, the green light may have a centroid wavelength in the 490-560 nm range. The terms “yellowlight” or “yellow emission”, and similar terms, may especially relate to light having awavelength in the range of about 560-590 nm. In specific embodiments, the yellow light may have a centroid wavelength in the 560-590 nm range. The terms “orange light” or “orange emission”, and similar terms, may especially relate to light having a wavelength in the range of about 590-620 nm. In specific embodiments, the orange light may have a centroid wavelength in the 590-620 nm range. The terms “red light” or “red emission”, and similar terms, may especially relate to light having a wavelength in the range of about 620-750 nm. In specific embodiments, the red light may have a centroid wavelength in the 620-750 nm range. The terms “cyan light” or “cyan emission”, and similar terms, especially relate to light having a wavelength in the range of about 490-520 nm. In specific embodiments, the cyan light may have a centroid wavelength in the 490-520 nm range. The terms “amber light” or “amber emission”, and similar terms, may especially relate to light having a wavelength in 2023PF80536 52 the range of about 585-605 nm, such as about 590-600 nm. In specific embodiments, the amber light may have a centroid wavelength in the 585-605 nm range. 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 440-490 nm wavelength range. The term “orange-red” light, and similar terms, may especially relate to light having a wavelength inthe range of about 590-750 nm. In specific embodiments, the orange-red light may have acentroid wavelength in the 590-750 nm range. The term “green-yellow” light, and similar terms, may especially relate to light having a wavelength in the range of about 490-590 nm.In specific embodiments, the orange-red light may have a centroid wavelength in the 490-590nm 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.1-11 schematically depict embodiments of the light generating system; Fig.12 schematically depicts an embodiment of the lighting device. The schematic drawings are not necessarily to scale. DETAILED DESCRIPTION OF THE EMBODIMENTS Fig.1-11 schematically depict embodiments of light generating systems 1000. In the depicted embodiments, the light generating system 1000 may comprise a first light generating device 110, a luminescent material 200, a control system 300, optics 500, a polarization control system 600, a diffuser system 1710, and a light exit 1090. Figs.1 and 2 schematically depict two alternative basic embodiments. The first light generating device 110 may comprise a solid-state light source 10 selected from the group of diode lasers, superluminescent diodes, and multi-junction light emitting diodes. The first light generating device 110 is especially configured to generate first device light 111. The luminescent material 200 may especially be configured to convert first device light 111 received by the luminescent material 200 into luminescent material light 201. 2023PF80536 53 The diffuser system 1710 may be configured to diffuse first device light 111 received by the diffuser system 1710 into diffused device light 711. The optics 500 may amongst others comprise a first polarization based redirection optics PBS1 and a central redirection optics CBS. In embodiments, the first polarization based redirection optics PBS1 may be (a) configured to transmit light having a first linear polarization and reflect light having a second linear polarization or may be (b) configured to reflect light having a first linear polarization and transmit light having a second linear polarization; wherein the first polarization based redirection optics PBS1 is configured in an optical path between the first light generating device 110 and the diffuser system 1710. Further, the light generating system 1000 may be configured such that the first device light 111 reaching the first polarization based redirection optics PBS1 may comprise linear polarized light. The polarization control system 600 may in embodiments be configured to control a polarization of diffused device light 711 reaching the central redirection optics CBS. Yet, in embodiments the central redirection optics CBS may comprise an orthogonal arrangement of a polarization based redirection optics CPBS and a dichroic based redirection optics CDBS. Especially, the polarization based redirection optics CPBS may be (a) configured to transmit light having a first linear polarization and reflect light having a second linear polarization or may be (b) configured to reflect light having a first linear polarization and transmit light having a second linear polarization. The dichroic based redirection optics CDBS may be configured to reflect or transmit light in dependence of a spectral wavelength of the light. In embodiments, the central redirection optics CBS may be configured in an optical path between the first polarization based redirection optics PBS1 and the light exit 1090. Especially, the central redirection optics CBS may be configured such that a in dependence of the polarization of light received by the central redirection optics CBS, at least part of the light (received by the central redirection optics CBS) is directed to the light exit 1090 and / or at least part of the light is directed to the luminescent material 200, and b at least part of the luminescent material light 201 is directed to the light exit 1090. Especially, the light generating system 1000 may be configured to generate system light 1001. In embodiments, in a first operational mode of the light generating system 1000 the system light may be white light 1001 comprising at least part of the luminescent material light 201 and at least part of the diffused device light 711. Further, in embodiments 2023PF80536 54 the control system 300 may be configured to control a spectral power distribution of the system light 1001. In embodiments, the diffuser system 1710 may comprise an arrangement of a polarization converter 720 and a polarization maintaining diffuser 710. Especially, the polarization maintaining diffuser 710 may comprise small-angle diffuse reflector, with a diffusion angle of at maximum 10°. However, other options may also be possible. In embodiments, the optics 500 (further) comprise a first reflector element 651, wherein the first polarization based redirection optics PBS1, the central redirection optics CBS, and the first reflector element 651 may be configured such that at least part of light propagating, in an operational mode of the light generating system 1000, from the central redirection optics CBS to the first polarization based redirection optics PBS1, may be transmitted by the first polarization based redirection optics PBS1 and reflected via the first reflector element 651 (and transmitted (again) via the first polarization based redirection optics PBS1) back to the central redirection optics CBS. This may thus be a specular reflector, though in specific embodiments (see below), instead of this first reflector 651 yet a further diffuser system may be applied. Especially, in embodiments the first polarization based redirection optics PBS1 may be a at least 90% reflective for one of (i) s-polarized device light and (ii) p- polarized device light, and (b) at least 90% transmissive for the other one of (i) s-polarized device light and (ii) p-polarized device light. In embodiments, the central redirection optics CBS may comprise a cube beam splitter comprising the orthogonal arrangement of a polarization based redirection optics CPBS and a dichroic based redirection optics CDBS. Especially, in embodiments the dichroic based redirection optics CDBS may be (a) at least 90% transmissive or at least 90% reflective for the diffused device light 711 and may be (b) at least 90% reflective or at least 90% transmissive for at least part of the spectral distribution of the luminescent material light 201. In embodiments, the polarization based redirection optics CPBS may be (a) at least 50% reflective for one of (i) s-polarized first device light 111 and (ii) p-polarized first device light 111, and (b) at least 50% transmissive for the other one of (i) s-polarized first device light 111 and (ii) p-polarized first device light 111. Hence, in embodiments the polarization based redirection optics (CPBS) may be (a) at least 50% reflective for s- polarized first device light 111, and at least 50% transmissive for p-polarized first device 2023PF80536 55 light 111, or may be (b) at least 50% transmissive for s-polarized first device light 111, and at least 50% reflective for p-polarized first device light 111. In specific embodiments, the first light generating device 110 may be configured to provide first device light 111 having a first centroid wavelength λc1 selected from the wavelength range of 430-490 nm. Further, in specific embodiments the first light generating device 110 may comprise a laser bank. Further, especially, the luminescent material 200 may be configured to convert at least part of the first device light 111 received by the luminescent material 200 into luminescent material light 201 having spectral power (especially its centroid wavelength) in the green-yellow wavelength range. For instance, to this end the luminescent material may comprise a trivalent cerium comprising garnet (see also above). In specific embodiments, in the first operational mode the system light 1001 may be white light having a correlated color temperature selected from the range of 2000- 10000 K, such as 6000-10,000 K, like 6000-9000 K, and a CRI of at least 65. Referring to e.g. the embodiments schematically depicted in Fig.1, but also in other Figures, like Figs.2-6, the polarization control system 600 may comprise a polarization rotator 610 configured downstream of the first polarization based redirection optics PBS1 and upstream of the polarization based redirection optics CPBS. The control system 300 may be configured to control the spectral power distribution of the system light 1001 by controlling (a rotation of) the polarization rotator 610. In embodiments, the polarization rotator 610 may comprise a birefringent rotator, wherein the birefringent rotator may comprise a λ / 2 waveplate. The polarization control system 600 may be configured to control rotation of the birefringent rotator. This may be done with the aid of a movement device, schematically depicted and indicated with reference 620. The movement device 620 may move, such as rotate, the polarization rotator 610. To this end, the movement device 620 may e.g. comprise an actuator. In alternative embodiments, and again referring to Figs.1-7, but also other Figures, the polarization rotator 610 and the movement device 620 may be replaced by a movement device that is configured to move, especially rotate, the first light generating device 110 (see e.g. Fig.8, and optionally other elements of the light generating system 100 (see e.g. Figs.1&5, while arrangements analogues to arrangement 640 (see also below) fromFigs 1 and 5 may also be applied in the embodiments of Figs. 2-4, 6 and 7). To this end, amovement device 630 may be applied. Hence, in (alternative) embodiments the polarization 2023PF80536 56 control system 600 may comprise a movement device 630, wherein the movement device 630 is configured to control an orientation of the first light generating device 110 relative to the first polarization based redirection optics PBS1. Especially, the control system 300 may be configured to control the spectral power distribution of the system light 1001 by controlling the movement device 630. Referring to Fig.1, an arrangement 640, comprising the first light generating device 110, collimation (“or condensing”) optics 560, the first polarization based redirection optics PBS1, and the diffuser system 1710 (here first diffuser system 1710’), may be rotated by the movement device 630. Hence, either the arrangement 640 may be rotated, and then the (in the Fig. dashed) polarization rotator and the (in the Fig. dashed) movement device 620 may not be available, or the arrangement 640 may not be rotated, and then the (in the Fig. dashed) polarization rotator and the (in the Fig. dashed) movement device 630 may be available. In embodiments, the control system 300 may be configured to control such that: (i) in the 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. In specific embodiments, |CCT2-CCT1| ≥ 1000 K. Further, in embodiments in the first operational mode of the light generating system 1000 the system light 1001 may be white light having a correlated color temperature selected from the range of 6000-10000 K and a color rendering index of at least 65. Referring to Fig.1, only a single device light source light beam may be used, having linear polarization (p-polarized) and incident on PBS1. In this case there is no second device light source light beam incident on the central cube beam splitter, while the system perfectly complies with the description provided in the previous section. Hence, with a single light generating device, generating a single beam of first device light 111, it may be possible to provide system light 1001 that may be controllable in spectral power distributions, due to the use of the polarization system. When more than one light generating device is available, or at least when individually controllable beams of lightmay be generated from a single light generating device (e.g. a laser bank with two or morelaser diode strings), it may also be possible (together with optics) to provide individually controllable beams of (first and one or more of second device light and third device light. For instance, in alternative embodiments, using a (general or neutral) beam splitter, part of the first device light 111 could be split off and propagate to e.g. the luminescent material 200 via the central redirection optics CBS. 2023PF80536 57 Referring to Fig.2, the light from a first laser source is diffused and partly transmitted by a central beam splitting cube to the output of the light engine, and partly reflected by the cube to a luminescent converter. The light from a second laser source of transmitted by the cube to the luminescent converter. The luminescent light is reflected by the cube to the light engine output and together with the diffused blue device light in the output generates a white light output beam, of which the CCT is determined by the setting of the birefringent rotator. The spectral composition of the two blue device light sources may be substantially the same or may be different. Hence, in embodiments the system 1000 may further comprise a second light generating device 120, wherein the second light generating device 120 is configured to provide second device light 121 having a second centroid wavelength λc2, especially selected from the wavelength range of 430-490 nm. Referring to Fig.2 and where applicable, also to other Figures, here below some further embodiments are described. In this configuration, the light from a first device light source is, after a first small-angle diffusion or integration via an integrator to prevent hot spots downstream in the beam, reflectively diffused and redirected via the well-known combination of a quarter wavelength plate (QWP) and a first polarizing beam splitter (PBS1). The polarization of this beam is adjusted via a birefringent rotator before entering a central cube beam splitter. The p- polarized fraction is transmitted by the PBS interface in the cube to the exit of the engine, while the s-polarized fraction is reflected by that interface towards a luminescent converter. Blue device light from a second device light source having p-polarization relative to the beam splitter interfaces in the central cube is incident orthogonally from the diffused first device light source light on the central cube and transmitted towards the luminescent converter. The luminescent light is collected by the condenser lenses, that also prior to the conversion did project the device light onto the luminescent material, and projected back onto the central cube. There, the dichroic beam splitting (DBS) interface redirects (i.e., reflects) the luminescent light to the exit of the engine. The blue device light that is reflected from the luminescent material (i.e., without having undergone luminescent conversion) is substantiallydepolarized due to the large number of scatter events, and therefore comprises both p- and s-polarized device light. The s-polarized fraction of this back-scattered device light is reflected by the PBS interface in the central cube towards PBS1 where it is at least partly transmitted thanks to the polarization rotation induced by the birefringent rotator. That fraction is reflected by a mirror and returns to the central cube, where it is distributed over the engine’s output channel and the luminescent conversion channel. Adjustment of the orientation of the 2023PF80536 58 birefringent rotator results in adjustment of the ratio of luminescent to blue light in the output beam and therefore of the CCT of the output light. In this basic configuration, the beam splitter / combiner components typically may have the following characteristics:- PBS1 = Polarizing Beam Splitter (blue): Rs > 90% and Tp > 90% for bluelight ( at least for λ1, preferably for λ1 and λ2);- the cube beam splitter comprises:- DBS = Dichroic Beam Splitter (blue / yellow): T > 90% for λ1 and λ2blue, R > 90% for yellow; and -PBS = Polarizing Beam Splitter (blue, λ1 and λ2): Rs > 90% for λ2blue and > 50% for λ1 blue; Tp > 90% for λ2 blue and > 50% for λ1 blue, T > 90% for yellow. The (blue) device light emitters may have the same or may have different wavelengths. In further embodiments, characteristics of the components as mentioned in the basic concept are varied, and / or the number of device light sources are varied, while, apart from output power scaling with the total power of the device light sources, the same or similar light engine output characteristics are achieved. Hence, amongst others, the invention provides a CCT-tunable high brightness and high flux light engine based on at least a first device light source and optionally one or more further device light sources, each of these device light sources comprising one or more of laser diodes. In case of multiple device light sources, these may emit light with substantially the same centroid wavelength or, alternatively, may emit light with different centroid wavelengths. The light engine may in embodiments further comprise at least: a polarizing beam splitter, a central cube beam splitter, a reflective luminescent converter; a reflective (small angle) diffuser; an arrangement for adjustment of the polarization of the first device light source light, a quarter wave plate. The central cube beam splitter may in a first aspect be characterized in that it combines in one plane a dichroic beam splitting interface and in a second plane, orthogonal to the first plane, a polarizing beam splitting interface. The system may further be characterized by one or more of: (a) the polarization of the light from the first device light source incident on the central cube beam splitter is adjustable via a birefringent rotator or via rotation of the first device light source (optionally combined with other optical components), (b) a first portion of the light of the first device light source is transmitted or reflected by the 2023PF80536 59 central cube beam splitter towards the output of the engine, (c) a second portion of the light of the first device light source is reflected or transmitted by the central cube beam splittertowards a luminescent converter (d) luminescent light is reflected by the central cube beamsplitter towards the output of the engine, (e) optionally, a second light beam from a second device light source is transmitted or reflected by the central cube beam splitter or, alternatively, a second light beam from a second device light source is reflected by the central cube beam splitter towards a reflective diffuser and the reflectively diffused second device light beam is transmitted by the central cube beam splitter towards the output of the engine, (f) the relative powers of the first and second portions of the first device light source light are determined by the setting of the arrangement of adjusting the polarization of the first device light source light, and (g) the first and second portions of the first device light source light are at least small-angle diffused before reaching the reflective diffuser and the luminescentmaterial, respectively, and may possibly be composed of different spectral distributions fromdifferent wavelength device light sources. With the architectures according to these principles a compact and efficient, CCT-tunable, high brightness and high power laser-phosphor light engine can be realized that for all CCT settings can be operated at maximum device light source power settings. Referring to Fig.3, in a (second) alternative embodiment, the diffusive reflector may be a small-angle diffusive reflector with diffusion angles ≤ 10°, especially ≤ 5°, especially however at least 1°, such as at least about 2°, enabling absence of condenser lenses between the PBS1 and the diffusive reflector. This may result in absence of any depolarization losses in the diffused blue light channel that otherwise may result from depolarization that is caused by thermal stress in the condenser lenses due to some light absorption. In the embodiment, as schematically depicted in Fig.3, the device light may reach the small-angle diffusive reflector in absence of condenser lenses between PBS1 and the reflective diffuser. The two device light wavelengths may be equal or may be different. In e.g. Fig.3, the central redirection optics CBS may be configured in an optical path between the second light generating device 120 and the luminescent material 200. Especially, the central redirection optics CBS may be configured such that second device light 121 is directed to the luminescent material 200 and luminescent material light 201, generated by one or more of the first device light 111 and the second device light 121, is directed to the light exit 1090. Referring to Fig.4, In a (third) alternative embodiment, the polarization of the first device light may be s-polarized rather than p-polarized as was the case in the previously 2023PF80536 60 presented configurations. Therefore, in this case the incident s-polarized device light may be reflected by PBS1 rather than transmitted, and the reflective diffuser and the mirror change place to let the system work. The remainder of the engine is essentially identical to the previous configurations (of Figs.2-3). In this embodiment, the device light upon initial incidence on the first polarizing beam splitter may thus not be p-polarized but s-polarized, resulting in reflectance of this device light towards the reflective diffuser rather than transmittance to it. Again, the two device light wavelengths may be equal or may be different. Fig.5 schematically depicts a (fourth) alternative embodiment, wherein the device light incident on PBS1 is again linearly polarized but now it is composed of two spectral contributions from two different device light sources that have been combined using a dichroic filter. For this, a third device light source is added that has a characteristic wavelength such as a peak wavelength, dominant wavelength, or centroid wavelength, which is at least 5 nm, preferably at least 10 nm, different from that of the first device light source. The downstream optical filters may be designed to work in substantially the same way on these two spectral contributions, and therefore the remainder of the system can be essentially the same as presented before. Therefore, the wavelength of the second device light source light may be identical to any of the first and the third device light source light, but, alternatively, it may be different from those. In this embodiments, a third device light source is introduced having a characteristic wavelength that differs from that of the first device light source. The light from the first and third device light sources is combined by an additional dichroic beam splitter DBS1. The PBS1 as well as the DBS and PBS in the central cube beam splitter work substantially the same on the first and the third device light source light. The characteristic wavelength of the second device light source may be identical to that of one of the first and the third device light sources, or it may be different from those. Hence, in embodiments the light generating system 1000 may further comprise a third light generating device 130, wherein the third light generating device 130 is configured to provide third device light 131 having a third centroid wavelength λc3. Especially, in embodiments the light generating system 1000 may be configured such that the first device light 111 and the third device light 131 are dichroically combined via a first dichroic based redirection optics DBS1 configured upstream of the first polarization based redirection optics PBS1. In such embodiments, e.g. |λc1-λc3| ≥ 5 nm may apply. In embodiments, the third centroid wavelength λc3 may be selected from the wavelength range of 430-490 nm, and |λc1-λc3| ≤ 50 nm may apply, and in other embodiments 2023PF80536 61 the third centroid wavelength λc3may be selected from the wavelength range of 590-780 nm, and |λc1-λc3| > 50 nm. In the former embodiments, the polarization maintaining diffuser 710 and / or the polarization converter 720 may be optimized in the blue. In the latter embodiments, the polarization maintaining diffuser 710 and / or the polarization converter 720 may be optimized for both the blue and a wavelength from the third device light, e.g. third centroid wavelength λc3, which may even be in the red. Fig.5 also by way of example schematically shows arrangement 640. Hence, either the arrangement 640 may be rotated, and then the (in the Fig. dashed) polarization rotator and the (in the Fig. dashed) movement device 630 may not be available, or the arrangement 640 may not be rotated, and then the (in the Fig. dashed) polarization rotator and the (in the Fig. dashed) movement device 620 may be available. Note that this type of arrangement may be applied in all the schematically depicted embodiments, not only in those of Figs.1 and 5. Note that Fig.5 shows an example of embodiment wherein diffused device light 711 may comprise both diffused first device light 111 and diffused third device light 131. The diffuser 710 and / or the polarization converter 720 may be optimized for both centroid wavelengths, would these differ. In the embodiment of Fig.11, this is solved with an additional diffuser arrangement 1710’’’. Then, the respective diffuser 710 and / or the polarization converter (schematically depicted as rectangle between the diffuser 710 and the central redirection optics CBS for the diffuser arrangement 1710’’’) for the diffuser arrangements 1710 and 1710’’’ may be optimized for the respective centroid wavelengths of the first device light 111 and third device light 131. Assuming blue first device light and red third device light, as well as blue second device light, in embodiments PBS1 may be transmissive for p-pol blue first device light, reflective for s-pol blue first device light, transmissive for p-pol red third device light, and reflective for s-pol red third device light. The CPBS may in embodiments be reflective for s-pol blue first device light, transmissive for p-pol blue first device light and seconddevice light, transmissive for luminescent material light (between about λc1 and λc3),transmissive for red third device light and in specific embodiments transmissive for luminescent material light having wavelengths larger than λc3. Further, in embodiments the CDBS may be transmissive for p-pol blue first device light and second device light, reflective for luminescent material light between the larger of λc1 and λc2 on the one hand and λc3 on the other hand, transmissive for red third device light, and in specific embodiments reflective for luminescent material light having wavelengths larger than λc3. 2023PF80536 62 With reference to Fig.6, in a (fifth) alternative embodiment, the device light incident on the central cube beam splitter that is to be transmitted towards the luminescent converter may again be linearly polarized but now it may be composed of two spectral contributions from two different device light sources that have been combined using a dichroic filter. For this, (in a similar way as for the previous embodiment) a third device light source may be added that has a characteristic wavelength such as a peak wavelength, dominant wavelength, or centroid wavelength, which may be at least 5 nm, especially at least 10 nm, different from that of the second device light source. The downstream optical filters in the central cube beam splitter are designed to work in substantially the same way on these two spectral contributions, and therefore the remainder of the system can be essentially the same as presented before. Therefore, the wavelength of the first device light source light may be identical to any of the second and the third device light source light, or, alternatively, it may be different from those. Hence, in embodiments a third device light source may be introduced having a characteristic wavelength that differs from that of the second device light source. The light from the second and third device light sources is combined by an additional dichroic beam splitter DBS1. The DBS and PBS filters in the central cube beam splitter work substantially the same on the second and the third device light source light. The characteristic wavelength of the first device light source may be identical to that of one of the second and the third device light sources, or it may be different from those. Referring to e.g. Fig.6, the second device light 121 and the third device light 131 may dichroically be combined via a first dichroic based redirection optics DBS1 configured upstream of the central redirection optics CBS. Further, in embodiments |λc2-λc3| ≥ 5 nm may apply. In a further alternative embodiments, the principles of the fourth and fifth alternative embodiments may be combined resulting in a system with four device light sources. Again, there are at least two different device light source wavelengths involved, while two or three device light sources may emit substantially the same spectral distributions of light. In a sixth alternative embodiment, the polarization of the first device light source light is adjusted before having been diffused by a (small-angle) diffusive reflector, but prior to reaching PBS1. This means that upon rotation of the birefringent rotator the fractions of first device light source light that are transmitted and reflected by PBS1 are adjusted. Therefore, now an additional small-angle diffusive reflector and an additional λ / 4 plate are introduced. As presented before in the second alternative embodiment, the condenser lenses 2023PF80536 63 in front of the reflective diffusers are removed and the reflective diffusers are made large enough in diameter to reflect the full beam, by which a very space-effective configuration is realized. This embodiment is schematically depicted in Fig.7. Alternatively, the small-angle diffusive reflectors may be integrated with the quarter wave plates. In this embodiment, the polarization of the first device light source may be adjusted prior to entering PBS1, rather than in between PBS1 and the central cube beam splitter as presented in the previous embodiments. An additional diffusive reflector and λ / 4 plate are introduced. The system 1000 may be kept very compact by using large diameter, yet small-angle diffusive reflectors. The remainder of the system is similar to that of previously presented embodiments. This aspect of this embodiment is also applied in the embodiments schematically depicted in Figs.9-11. Hence, in embodiments the polarization control system 600 may comprise a polarization rotator 610 configured downstream of the first light generating device 110 and upstream of the first polarization based redirection optics PBS1. Especially, in embodiments the control system 300 may be configured to control the spectral power distribution of the system light 1001 by controlling (a rotation of) the polarization rotator 610 (though control via the respective radiant fluxes of the light generating devices 110,120 (and optionally 130) is herein not excluded). In embodiments, the polarization rotator 610 may comprise abirefringent rotator, wherein the birefringent rotator may comprise a λ / 2 waveplate, whereinthe polarization control system 600 is configured to control rotation of the birefringent rotator. Referring to e.g. Fig.7, they system 1000 may comprise two diffuser systems 1710, indicated with references 1710’ and 1710’’, wherein the two diffuser systems 1710 be configured to diffuse first device light 111 received by the diffuser systems 1710 into diffused device light 711. Would the embodiment of Fig.7 be combined with a third light generating device, such as applied in Fig.5, the two diffuser systems 1710 may be configured to diffuse first device light 111 and third device light received by the diffuser systems 1710 into diffused device light 711. In a (seventh) alternative embodiment, the polarization of the device light prior to entering PBS1 is set by physical rotation of the device light source or device light source assembly that provides the light entering PBS1. Although this is mechanically less flexible than using a birefringent rotator, it may offer a lower cost implementation for the same end result. This may be particularly of interest in case of targeted factory setting of the light engine’s CCT, rather than providing full flexibility of CCT re-adjustments at any time. This embodiment is schematically depicted, for a single device light source providing the 2023PF80536 64 light incident on PBS1, in Fig 8. However, as indicated above, this may also be applied when multiple light generating devices are available for the generation of diffused blue light. however, in such embodiments, the arrangement 640 may include more elements (see also above). Hence, Fig.8 schematically depicts a seventh alternative embodiment, in which the polarization direction of the device light incident on PBS1 may be adjustable by rotation of the first device light source. Referring to Fig.8, orientation of a third device relative to an optical axis of the (beam of light) directed to the central redirection optics (CBS), especially a rotational orientation around a (third) optical axis of the third device light, may be applied, e.g. when third device light would be dichroically, or via a geometric beam combiner, mixed with first device light 111 prior to incidence on first polarization based redirection optics PBS1 (this embodiment is not depicted in Fig.8). In an (eighth) alternative embodiment, the second device light source light incident on the central cube beam splitter may be s-polarized rather than p-polarized as was the case in a plurality of the previous embodiments. This means that the location of the exit channel and the luminescent converter channel may be exchanged. With those adjustments, the system still fulfils the generalized description presented in the previous section, while the performance is identical to that presented before. This embodiment is depicted schematically in Fig.9. Note that in this case it is the s-polarized fraction of the diffused first device light that contributes as blue light to the engine’s (white) output light, rather than the p-polarized fraction in previous embodiments. Hence, in Fig.9, the device light upon initial incidence on the central cube beam splitter is not p-polarized but s-polarized, resulting in reflectance of this device light. Therefore, the locations of the luminescent converter and the exit of the engine are exchanged compared to previous embodiments. Consequently, the luminescent converter is now irradiated by p-polarized diffused first device light transmitted by the central cube beam splitter and by s-polarized second device light that is reflected by the central cube beam splitter, while it is the s-polarized diffused first device light that contributes as blue light in the white light output beam. In a (nineth) alternative embodiment, the system may comprise two (or more) device light sources, of which only a single device light source contributes to the blue content in the engine’s white output light, and in which the central cube beam splitter does not interact any at all with the second device light. In other words, the second device light may be first converted into luminescent light and only this converted light as well as the (diffused) first device light may be incident on the central cube beam splitter. To enable this, an 2023PF80536 65 additional polarizing beam splitter PBS2 may be introduced, located between the central cube beam splitter and the luminescent converter. By this approach, the output characteristics are identical to those of the eight alternative embodiment, but the eye safety risk has been eliminated: malfunctioning of the cube and / or PBS1 and / or PBS2 (and / or a transmissive integrator) can never cause a direct laser beam exiting the engine. A schematic representation of such embodiment is presented in Fig.10. Hence, Fig.10 schematically depicts an embodiment, in which an additional PBS2 has been introduced that eliminates the possibleeye-safety risk associated with the eighth alternative embodiment. Here, the second devicelight doesn’t interact with the central cube beam splitter any at all, in contrast to the previous embodiments. In e.g. Fig.10, the light generating system 1000 may (thus) further comprise a second polarization based redirection optics PBS2 configured in an optical path between the central redirection optics CBS and the luminescent material 200. Especially, the second light generating device 120 may be configured upstream of the second polarization based redirection optics PBS2. Further, the second polarization based redirection optics PBS2 and the central redirection optics CBS may be configured such that second device light 121 is directed to the luminescent material 200 and luminescent material light 201, generated by one or more of the first device light 111 and the second device light 121, is directed to the light exit 1090 (via the second polarization based redirection optics PBS2 and the central redirection optics CBS, respectively). In a (tenth) alternative embodiment, the system comprises a third device light source that may have a characteristic wavelength that may be identical to or may be differentfrom that of any of the first and second device light sources. The light from this third devicelight source may be s-polarized relative to PBS2 and may be coupled into the system via PBS2, which reflects this light towards the central cube beam splitter where it is reflected by the PBS interface. An additional small-angle diffusive reflector in combination with an additional λ / 4 plate is added at the side of the central cube from which the reflected third device light exits. Consequently, the reflectively diffused third device light contributes as blue light to the engine’s output white light, typically enabling very high color temperatures. This embodiment is schematically represented in Fig.11. Hence, in Fig.11 a third device light source is added of which the light is coupled to the central cube beam splitter via PBS2. For the reflective diffusion of this third device light, an additional λ / 4 plate and small-angle reflective diffuser plate are added as well, located next to the central cube beam splitter. Consequently, this additional blue light contributes, after having been diffused and combined 2023PF80536 66 with the s-polarized diffused first device light and the luminescent light, next to the s- polarized diffused first device light, as (p-polarized) blue light to the engine’s white output light. Referring to Fig.11, the light generating system 1000 further may comprise the second polarization based redirection optics PBS2. Especially, in embodiments the third light generating device 130 may be configured upstream of the second polarization based redirection optics PBS2. Yet, in embodiments the light generating system 1000 may comprise two or three diffuser systems 1710.Especially, in embodiments the second polarization based redirection optics PBS2 and the central redirection optics CBS may be configured to direct the third device light 131 to one of the afore-mentioned one or two diffuser systems 1710 or to a third diffuser system 1710. In embodiments, (a) one or two diffuser systems 1710 of the two or three diffuser systems 1710 may be configured to diffuse first device light 111 received by the one or two diffuser systems 1710, and (b) one of the two or three diffuser systems 1710 may be configured to diffuse third device light 131 received by said diffuser system 1710, into diffused device light 711. Further, especially the optics 500 may be configured to direct the diffused device light 711 generated by the two or three diffuser systems 1710 to the light exit 1090. Referring to e.g. Fig.11, the third device light 131 may not be used to excite the luminescent material, and therefor may contribute anywhere in the visible spectrum such as in the red spectral range with a center wavelength larger than that of the luminescent material light. Note that for this, PBS2 may only need to be reflective for s- polarized third device light, and may preferably be transmissive for p-polarized light in that spectral band (and thus enabling contribution of p-polarized luminescent light in that spectral range to the system output light). This latter aspect may hold for any third center wavelength that substantially overlaps with the spectral range of the luminescent material. So, |λc2-λc3| may alternatively be ≥100 nm (or maybe even ≥120 nm). Hence, in embodiments (a) the third centroid wavelength λc3 may be selected from the wavelength range of 430-490 nm, and |λc2-λc3| ≤ 50 nm, or (b) the third centroid wavelength λc3selected from the wavelength range of 590-780 nm, and |λc2-λc3| > 50 nm, or even ≥100 nm. Of course, any of the previously mentioned approaches for adding a third and / or fourth device light source in the system may be applied here as well, using wavelength multiplexing (i.e., combining the light from an additional device light source with a different characteristic wavelength than that of the first or the second device light source via a dichroic filter). The latter extensions do increase the maximum relative contribution of luminescent 2023PF80536 67 light in the engine’s white output light, apart from increasing the overall output power of the engine. In this way, light engines comprising four or even five device light sources while using a minimum of 2 different characteristic device light wavelengths are enabled. As these latter extensions are obvious and the implementation options are clear from the previously described fourth and fifth alternative embodiments, this has not been further elucidated with an additional figure. In further alternative embodiments, any permutation of the principle presented in the previously described embodiments may be used. In further embodiments the color point adjustable laser-phosphor light engine comprises one optical branch with a first fully luminescent converting material (or material composition) emitting first (composed) luminescent light and with a second branch in which diffuser material is combined with second luminescent material emitting second luminescent light, where the second luminescent emission is spectrally substantially non-overlapping with the first luminescent emission, resulting in color point tunability of the laser-phosphor engine output light along a line that is substantially parallel or at least more parallel to the BBL in a targeted range of color temperatures. For instance, a reflective diffuser from any of the presented embodiments may be replaced by, or enriched with, luminescent material. For suchembodiments, obviously, the optical filter components interacting with this secondluminescent light need to be adapted concerning the spectral characteristics of the light to let these components function correctly. In yet further embodiments according to this invention, as variants of any of the preceding embodiments, one or more of the laser sources may be high frequency and / or amplitude modulated to enable optical wireless communication (OWC). As luminescent materials are generally far slower in their temporal response (i.e., in their decay rate) compared to the lasers, preferably just the blue laser(s) that provide(s) a blue spectral contribution to the engine’s (white) output light is used for this OWC. In case of multiple device light sources contributing to the blue spectral content in the white output light, one may, for simplicity, cost reasons, and / or robustness, specifically select the device light source that contributes most to the diffused device light in the output white light to be modulated for this. Finally, further variations are possible by using transmissive phosphor (wheel) elements and / or transmissive diffusive elements. Such variations have not been further detailed with drawings or descriptions but may be based on the same or similar principles as described above. 2023PF80536 68 Referring to Figs.7-11, in embodiments the light generating system 1000 may comprise two diffuser systems 1710, wherein the two diffuser systems 1710 are configured to diffuse first device light 111 received by the diffuser system 1710 into diffused device light 711, wherein the first polarization based redirection optics PBS1 is configured to direct the first device light 111 received by the first polarization based redirection optics PBS1 in dependence of its polarization to a respective diffuser system 1710 of the two diffuser systems 1710. Note that in these embodiments, a second diffuser system indicated with reference 1710’’ may effectively replace the first reflector element 651. Further note that the first diffuser system, indicated with reference 1710’, may thus be configured to diffuse first device light 111 received by the diffuser system 1710 into diffused device light 711, but may in specific embodiments also be configured to diffuse third device light 131 received by the diffuser system 1710 into diffused device light 711 (i.e.the diffused device light 711 may comprise diffused first device light and diffused thirddevice light), see e.g. Fig.5. Further, the light generating system 1000 may comprise a small-angle transmissive diffuser 575, or other integrator, with a diffusion angle of at maximum 10°, configured downstream of the first light generating device 110 and upstream of the first polarization based redirection optics PBS1. Such small-angle transmissive diffusers 575 may also be applied downstream of the second light generating device 120 or the third light generating device 130 (see Figs.2-11). Referring to e.g. Figs.9-11, the first device light 111 reaching the first polarization based redirection optics PBS1 may comprise both p-polarized light and s- polarized light, and the second device light 121 reaching the central redirection optics CBS may comprise s-polarized light. Further, in embodiments |λc1-λc2| ≤ 50 nm. Referring to Figs. 2,3,5,6,7,8, in embodiments both the first device light 111 reaching the first polarization based redirection optics PBS1, and the second device light 121 reaching the central redirection optics CBS may comprise p-polarized light. In other embodiments, the first device light 111 reaching the first polarization based redirection optics PBS1 may comprise s-polarized light, and the second device light 121 reaching the central redirection optics CBS may comprise p-polarized light. However, other embodiments may also be possible (see also above). Furthermore, in embodiments, the optics 500 may comprise one or more of collimation (“or condensing”) optics 560 and integrating (or “homogenizing”) optics 570. Light exit 1090 may in embodiments comprise a lens. 2023PF80536 69 Hence, in embodiments, during operation of the light generating system 1000, first device light 111 may propagate via the first polarization based redirection optics to the (first) diffuser system 1710, and then, via the central redirection optics CBS escape as diffused device light 711 from the system via the light exit, or optional part of the diffused device light 711 may irradiate the luminescent material 200 due to redirection via the central redirection optics CBS, generate luminescent material light 201, which may escape from the system 1000 via light exit 1090 along an optical path including the central redirection optics CBS. In embodiments, the second device light 121 may during operation of the light generating system 1000, propagate via the central redirection optics CBS, generate luminescent material light 201, which may escape from the system 1000 via the light exit 1090 along an optical path including the central redirection optics CBS. In embodiments, the third device light 131 may during operation of the light generating system 1000, be guided similarly as the first device light 111, to the (first) diffuser system 1710 (herein also indicated with reference 1710’). Alternatively, the third device light 131 may during operation of the light generating system 1000, be guided similarly as the second device light 121, to the luminescent material 200. Yet alternatively, the third device light 131 may during operation of the light generating system 1000, be guided to a (third) diffuser system 1710 (herein indicated with reference 1710’’’), via the central redirection optics CBS, wherein the thus generated diffused (third) device light 711 may be combined with the diffused (first) device light from the first and / or second diffuser system (indicated with reference 1710’ and 1710’’’, respectively), by the central redirection optics CBS, and escape via the light exit 1090. Other embodiments, however, are herein not excluded. Further note that in embodiments the central redirection optics (CBS) may be configured such that (a) in dependence of the polarization of light received by the central redirection optics (CBS), at least part of the light may be directed to the light exit 1090 and at least part of the light may be directed to the luminescent material 200. Fig.12 schematically depicts an embodiment of the lighting device 1200 comprising the light generating system 1000 of the invention. The lighting device 1200 may be selected from the group of a lamp 1, a luminaire 2, a projector device 3, a disinfection device, a photochemical reactor, and an optical wireless communication device. Specifically, Fig.12 schematically depicts an embodiment of a luminaire 2 comprising the light generating system 1000 as described above. Reference 301 indicates a user interface which may be functionally coupled with the control system 300 comprised by or functionally coupled to the 2023PF80536 70 light generating system 1000. Fig.12 also schematically depicts an embodiment of lamp 1 comprising the light generating system 1000. Reference 3 indicates a projector device or projector system, which may be used to project images, such as at a wall, which may also comprise the light generating system 1000. Hence, Fig.12 schematically depicts embodiments of a lighting device 1200 selected from the group of a lamp 1, a luminaire 2, a projector device 3, a disinfection device, a photochemical reactor, and an optical wireless communication device, comprising the light generating system 1000 as described herein. In embodiments, such lighting device may be a lamp 1, a luminaire 2, a projector device 3, a disinfection device, or an optical wireless communication device. Lighting device light escaping from the lighting device 1200 is indicated with reference 1201. Lighting device light 1201 may essentially consist of system light 1001, and may in specific embodiments thus be system light 1001. Reference 1300 refers to a space, such as a room. Reference 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 and optionally one or more other species". Use of the verb "to comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for 2023PF80536 71 describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein. The devices, apparatus, or systems may herein amongst others be described during operation. As will be clear to the person skilled in the art, the invention is not limited to methods of operation, or devices, apparatus, or systems in operation. It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a device claim, or an apparatus claim, or a system claim, enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. In yet a further aspect, the invention (thus) provides a software product, which, when running on a computer is capable of bringing about (one or more embodiments of) the method as described herein. The invention also provides a control system that may control the device, apparatus, or system, or that may execute the herein described method or process. Yet further, the invention also provides a computer program product, when running on a computer which is functionally coupled to or comprised by the device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system. The invention further applies to a device, apparatus, or system comprising one or more of the characterizing features described in the description and / or shown in the attached drawings. The invention further pertains to a method or process comprising one or more of the characterizing features described in the description and / or shown in the attached drawings. The various aspects discussed in this patent can be combined in order to provide additional advantages. Further, the person skilled in the art will understand that embodiments can be combined, and that also more than two embodiments can be combined. Furthermore, some of the features can form the basis for one or more divisional applications.

Claims

2023PF80536 72 CLAIMS:

1. A light generating system (1000) comprising a first light generating device(110), a luminescent material (200), a control system (300), optics (500), a polarization control system (600), a diffuser system (1710), and a light exit (1090); wherein:- the first light generating device (110) comprise a solid-state light source (10)selected from the group of diode lasers, superluminescent diodes, and multi-junction light emitting diodes; wherein the first light generating device (110) is configured to generate first device light (111);- the luminescent material (200) is configured to convert first device light (111)received by the luminescent material (200) into luminescent material light (201);- the diffuser system (1710) is configured to diffuse first device light (111)received by the diffuser system (1710) into diffused device light (711);- the optics (500) comprise a first polarization based redirection optics (PBS1)and a central redirection optics (CBS);- the first polarization based redirection optics (PBS1) is (a) configured totransmit light having a first linear polarization and reflect light having a second linear polarization or is (b) configured to reflect light having a first linear polarization and transmit light having a second linear polarization; wherein the first polarization based redirection optics (PBS1) is configured in an optical path between the first light generating device (110) and the diffuser system (1710); and wherein the light generating system (1000) is configured such that the first device light (111) reaching the first polarization based redirection optics (PBS1) comprises linear polarized light;- the polarization control system (600) is configured to control a polarization ofdiffused device light (711) reaching the central redirection optics (CBS);- the central redirection optics (CBS) comprises an orthogonal arrangement of apolarization based redirection optics (CPBS) and a dichroic based redirection optics (CDBS); the polarization based redirection optics (CPBS) is (a) configured to transmit light having a first linear polarization and reflect light having a second linear polarization or is (b) configured to reflect light having a first linear polarization and transmit light having a second linear polarization; the dichroic based redirection optics (CDBS) is configured to reflect or2023PF80536 73 transmit light in dependence of a spectral wavelength of the light; the central redirection optics (CBS) is configured in an optical path between the first polarization based redirection optics (PBS1) and the light exit (1090); the central redirection optics (CBS) is configured such that (a) in dependence of the polarization of light received by the central redirection optics (CBS), at least part of the light is directed to the light exit (1090) and / or at least part of the light is directed to the luminescent material (200), and (b) at least part of the luminescent material light (201) is directed to the light exit (1090);- the light generating system (1000) is configured to generate system light(1001); wherein in a first operational mode of the light generating system (1000) the system light is white light (1001) comprising at least part of the luminescent material light (201) and at least part of the diffused device light (711); and- the control system (300) is configured to control a spectral power distributionof the system light (1001).

2. The light generating system (1000) according to claim 1, wherein the diffusersystem (1710) comprises an arrangement of a polarization converter (720) and a polarization maintaining diffuser (710); wherein the polarization maintaining diffuser (710) comprises small-angle diffuse reflector, with a diffusion angle of at maximum 10°.

3. The light generating system (1000) according to any one of the precedingclaims, wherein the optics (500) comprise a first reflector element (651), wherein the first polarization based redirection optics (PBS1), the central redirection optics (CBS), and thefirst reflector element (651) are configured such that at least part of light propagating, in anoperational mode of the light generating system (1000), from the central redirection optics (CBS) to the first polarization based redirection optics (PBS1), is transmitted by the first polarization based redirection optics (PBS1) and reflected via the first reflector element (651) back to the central redirection optics (CBS).

4. The light generating system (1000) according to any one of the precedingclaims, wherein:- the first polarization based redirection optics (PBS1) is (a) at least 90%reflective for one of (i) s-polarized device light and (ii) p-polarized device light, and (b) at least 90% transmissive for the other one of (i) s-polarized device light and (ii) p-polarized device light;2023PF80536 74- the central redirection optics (CBS) comprises a cube beam splitter comprisingthe orthogonal arrangement of a polarization based redirection optics (CPBS) and a dichroic based redirection optics (CDBS);- the dichroic based redirection optics (CDBS) is (a) transmissive for at leastpart of the spectral power distribution of the diffused device light (711) and reflective for at least part of the spectral distribution of the luminescent material light (201), or (b) reflective for at least part of the spectral power distribution of the diffused device light (711) and transmissive for at least part of the spectral distribution of the luminescent material light (201); the polarization based redirection optics (CPBS) is (a) at least 50% reflective for s- polarized first device light (111), and at least 50% transmissive for p-polarized first device light (111), or (b) at least 50% transmissive for s-polarized first device light (111), and at least 50% reflective for p-polarized first device light (111);- the first light generating device (110) is configured to provide first device light(111) having a first centroid wavelength (λc1) selected from the wavelength range of 430-490 nm; the first light generating device (110) comprises a laser bank;- the luminescent material (200) is configured to convert at least part of the firstdevice light (111) received by the luminescent material (200) into luminescent material light (201) having spectral power in the green-yellow wavelength range; and- in the first operational mode the system light (1001) is white light having acorrelated color temperature selected from the range of 6000-10,000 K and a color rendering index of at least 65.

5. The light generating system (1000) according to any one of the precedingclaims 1-4, wherein the polarization control system (600) comprises a polarization rotator (610) configured downstream of the first polarization based redirection optics (PBS1) and upstream of the polarization based redirection optics (CPBS); and wherein the control system (300) is configured to control the spectral power distribution of the system light (1001) by controlling the polarization rotator (610); wherein the polarization rotator (610) comprises a birefringent rotator, wherein the birefringent rotator comprises a λ / 2 waveplate; wherein the polarization control system (600) is configured to control rotation of the birefringent rotator.

6. The light generating system (1000) according to any one of the precedingclaims 1-4, wherein the polarization control system (600) comprises a polarization rotator (610) configured downstream of the first light generating device (110) and upstream of the2023PF80536 75 first polarization based redirection optics (PBS1); and wherein the control system (300) is configured to control the spectral power distribution of the system light (1001) by controlling the polarization rotator (610); wherein the polarization rotator (610) comprises a birefringent rotator, wherein the birefringent rotator comprises a λ / 2 waveplate; wherein the polarization control system (600) is configured to control rotation of the birefringent rotator.

7. The light generating system (1000) according to any one of the precedingclaims 1-4, wherein the polarization control system (600) comprises a movement device (630), wherein the movement device (630) is configured to control an orientation of the first light generating device (110) relative to the first polarization based redirection optics (PBS1); and wherein the control system (300) is configured to control the spectral power distribution of the system light (1001) by controlling the movement device (630).

8. The light generating system (1000) according to any one of claims 6-7,comprising two diffuser systems (1710), wherein the two diffuser systems (1710) are configured to diffuse first device light (111) received by the diffuser systems (1710) into diffused device light (711), wherein the first polarization based redirection optics (PBS1) is configured to direct the first device light (111) received by the first polarization based redirection optics (PBS1) in dependence of its polarization to a respective diffuser system (1710) of the two diffuser systems (1710).

9. The light generating system (1000) according to any one of claims, furthercomprising a small-angle transmissive diffuser (575), with a diffusion angle of at maximum 10°, configured downstream of the first light generating device (110) and upstream of the first polarization based redirection optics (PBS1).

10. The light generating system (1000) according to any one of the precedingclaims, further comprising a second light generating device (120), wherein the second light generating device (120) is configured to provide second device light (121) having a second centroid wavelength (λc2) selected from the wavelength range of 430-490 nm; wherein:- the central redirection optics (CBS) is configured in an optical path betweenthe second light generating device (120) and the luminescent material (200); the central redirection optics (CBS) is configured such that second device light (121) is directed to the luminescent material (200) and luminescent material light (201), generated by one or more of2023PF80536 76 the first device light (111) and the second device light (121), is directed to the light exit (1090); or- the light generating system (1000) further comprises a second polarizationbased redirection optics (PBS2) configured in an optical path between the central redirection optics (CBS) and the luminescent material (200); wherein the second light generating device (120) is configured upstream of the second polarization based redirection optics (PBS2); and the second polarization based redirection optics (PBS2) and the central redirection optics (CBS) are configured such that second device light (121) is directed to the luminescent material (200) and luminescent material light (201), generated by one or more of the first device light (111) and the second device light (121), is directed to the light exit (1090).

11. The light generating system (1000) according to claim 10, wherein one of thefollowing applies: (a) both the first device light (111) reaching the first polarization based redirection optics (PBS1), and the second device light (121) reaching the central redirection optics (CBS) comprise p-polarized light, or (b) the first device light (111) reaching the first polarization based redirection optics (PBS1) comprises s-polarized light, and the second device light (121) reaching the central redirection optics (CBS) comprises p-polarized light,or (c) the first device light (111) reaching the first polarization based redirection optics(PBS1) comprises both p-polarized light and s-polarized light, and the second device light (121) reaching the central redirection optics (CBS) comprises s-polarized light; and wherein |λc1-λc2| ≤ 50 nm.

12. The light generating system (1000) according to any one of the precedingclaims, further comprising a third light generating device (130), wherein the third light generating device (130) is configured to provide third device light (131) having a third centroid wavelength (λc3); wherein the light generating system (1000) is configured such that:- the first device light (111) and the third device light (131) are dichroicallycombined via a first dichroic based redirection optics (DBS1) configured upstream of the first polarization based redirection optics (PBS1); wherein |λc1-λc3| ≥ 5 nm; or- the second device light (121) and the third device light (131) are dichroicallycombined via a first dichroic based redirection optics (DBS1) configured upstream of the central redirection optics (CBS); wherein |λc2-λc3| ≥ 5 nm; or- the light generating system (1000) further comprises the second polarizationbased redirection optics (PBS2) as defined in claim 10, wherein the third light generating2023PF80536 77 device (130) is configured upstream of the second polarization based redirection optics (PBS2); wherein the light generating system (1000) comprises two or three diffuser systems (1710); wherein the second polarization based redirection optics (PBS2) and the central redirection optics (CBS) are configured to direct the third device light (131) to one of the afore-mentioned one or two diffuser systems (1710) or to a third diffuser system (1710); wherein (a) one or two diffuser systems (1710) of the two or three diffuser systems (1710) are configured to diffuse first device light (111) received by the one or two diffuser systems (1710), and (b) wherein one of the two or three diffuser systems (1710) is configured to diffuse third device light (131) received by said diffuser system (1710), into diffused device light (711); and wherein the optics (500) are configured to direct the diffused device light (711) generated by the two or three diffuser systems (1710) to the light exit (1090).

13. The light generating system (1000) according to any one of claims 10-12,wherein one of the following applies: (a) the third centroid wavelength (λc3) selected from the wavelength range of 430-490 nm, and |λc2-λc3| ≤ 50 nm, or (b) the third centroid wavelength (λc3) selected from the wavelength range of 590-780 nm, and |λc2-λc3| > 50 nm.

14. The light generating system (1000) according to any one of the precedingclaims, wherein the control system (300) is configured to control such that: (i) in the 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| ≥ 1000 K; and wherein in the first 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 projector device (3), a photochemical reactor, an optical wireless communication device, an automotive lighting device, a stage lighting device, comprising the light generating system (1000) according to any one of the preceding claims.

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