Tunable laser-phosphor source with increased gamut area

Abstract

The invention provides a light generating system (1000) wherein: (A) a first light generating device (110) is configured to provide (blue) first device light (111); (B) a second light generating device (120) is configured to provide (red) second device light (121); (C) a luminescent material (200) is configured to convert first device light (111) into luminescent material light (201); (D) a first diffuser assembly (1710) is configured to diffuse first device light (111) into first diffused device light (711); (E) a second diffuser assembly (1720) is configured to diffuse second device light (121) into second diffused device light (721); (Fl) a first redirection optical element (515) is configured (a) to (i) reflect the luminescent material light (201), (ii) transmit the second diffused device light (721), and (iii) reflect or transmit (blue) light in dependence of its linear polarization, or (b) to transmit the luminescent material light (201), (ii) reflect the second diffused device light (721), and (iii) reflect or transmit (blue) light in dependence of its linear polarization; wherein the first redirection optical element (515) is configured to direct a part of the first device light (111) having a first linear polarization in an optical path to the luminescent material (200) and to direct another part of the first device light (111) having a second linear polarization in an optical path to the first diffuser assembly (1710); (F2) a second redirection optical element (525) is configured (a) to (i) reflect (blue) light, (ii) transmit the second diffused device light (721) to the first redirection optical element (515), and optionally (iii) reflect the second device light (121) to the second diffuser assembly (1720), or (b) to (i) transmit (blue) light, (ii) reflect the second diffused device light (721 to the first redirection optical element (515), and optionally (iii) transmit the second device light (121) to the second diffuser assembly (1720); (G) a polarization control system (600) is configured to control the polarization of the first device light (111) reaching the first redirection optical element (515); (H) the light generating system (1000) is configured to generate in a first operational mode of the light generating system (1000) white system light (1001) comprising luminescent material light (201), first diffused device light (711), and second diffused device light (721); and (I) a control system (300) is configured to control one or more of a spectral power distribution, a correlated color temperature, a color gamut, and a color rendering index of the system light (1001).

Description

[0001]2023PF80437 1 Tunable laser-phosphor source with increased gamut area FIELD OF THE INVENTION The invention relates to a light generating system. The invention furtherrelates 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,WO2019033672A1 describes a dual color laser light source and a laser projector. The laserlight source comprises a light composition member used to shine a first blue laser light onto a phosphor wheel, and to reflect green fluorescent light, produced when the first blue laser light irradiates a green fluorescent light region, to a light collecting member. The light composition member is further used to shine a second blue laser light onto the light collecting member, and to reflect a red laser, emitted by a red laser emitter and shone by a shining region, to the light collecting member. US2020 / 347293A1 discloses a light source device that is provided with a blue laser emitting element, a red laser emitting element, a phosphor, a polarization split element having a polarization split function with respect to blue light and red light, and a diffusion element. The blue light emitted from the blue laser emitting element enters the polarization split element to be split into a first blue polarization component and a second blue polarization component. The first blue polarization component enters the diffusion element to turn to blue diffused light. The phosphor is excited by the second blue polarization component to emit fluorescence, and the red light emitted from the red laser emitting element enters the diffusion element to be diffusely transmitted to turn to red diffused light. The blue diffused light, the red diffused light and a part of the fluorescence are combined with each other, and then emitted from the polarization split element. SUMMARY OF THE INVENTION High brightness light sources can be used in various applications including spots, stage-lighting, headlamps, home and office lighting, and automotive lighting. For this purpose, laser-phosphor technology can be used, wherein a laser provides laser light and a 2023PF80437 2 remote phosphor converts laser light into converted light. A relatively straightforward way to produce white light using lasers is to use (blue) laser light in combination with a (yellow) phosphor to generate phosphor converted light. Laser-phosphor systems may allow generation of high brightness light and may therefore be used in projection systems, including displays such as cinema projectors and projectors for home, school, and office applications, car front lighting, search lighting, stage lighting, architectural lighting, and special lighting applications. In general, a laser-phosphor light engine may be capable to generate only a single color point as defined by the luminescent converter. Creation of a product range providing different color points may be costly as it requires multiple unique components to be designed, qualified, produced, and kept in stock. In other cases, e.g. in RGB LCD-based projection systems, the maximum brightness is limited by the components used, the engine volume is large due to the many components, and the system cost are high due to the many dedicated components. In addition, the color quality may generally be relatively poor for such systems. Furthermore, such systems may have a limited colortemperature range. In laser-phosphor type light generating systems, such as e.g.entertainment fixtures, it may be desirable to prevent stroboscopic and / or flicker effects. Additionally, it may be desired that such a system may include precautions in view of eye safety. Furthermore, the systems as described in the prior art may generally provide their optimum performance only at a single color point, meaning that at all other selected color points one or more laser sources are operated sub-optimal. Hence, there may be a need for architectures that enable optimal (i.e., full) use of at least one laser light source to provide any of a range of selectable output (white light) color points, such that installation of redundant (expensive) laser diodes may be avoided. There may also be a need to enableselection of a large range of color temperatures on or close to the BBL (requiring three colorchannels to be tuned relative to each other), while providing high flux, high luminance, and high efficiency (white) output light. Hence, it is an aspect of the invention to provide an alternative light generatingsystem, which preferably further at least partly obviates one or more of above-describeddrawbacks. The present invention may have as object to overcome or ameliorate at least oneof the disadvantages of the prior art, or to provide a useful alternative. According to a first aspect, the invention provides a light generating system (“system”) comprising a first light generating device, a second light generating device, a luminescent material, a control system, redirection optics, a polarization control system, a first diffuser assembly, a second diffuser assembly, and a light exit. In embodiments, the first 2023PF80437 3 light generating device may be configured to provide first device light. Especially, inembodiments, the first device light may have a first centroid wavelength (λc1) selected fromthe wavelength range of 440-490 nm. Further, in embodiments, the first light generating device may comprise a first solid state light source. Moreover, in embodiments, the first device light reaching the redirection optics may comprise linear polarized light. In contrast, in embodiments, the second light generating device may be configured to provide seconddevice light. Especially, in embodiments, the second device light may have a second centroidwavelength (λc2) selected from the wavelength range of 620-780 nm. Further, in embodiments, the second light generating device may comprise a second solid state light source. Especially, in embodiments, the (first and second) solid state light sources may be individually selected from the group comprising laser diodes, superluminescent diodes, and stacked multi-junction light-emitting diodes. In further embodiments, the luminescent material may be configured to convert at least part of first device light received by the luminescent material into luminescent material light. In further embodiments, the first diffuser assembly may comprise a polarization converter and a first diffuser. Especially, the first diffuser assembly may be configured to diffuse at least part of first device light received by the first diffuser assembly into first diffused device light. In such embodiments, the firstdiffused device light may have the first centroid wavelength (λc1) and a linear polarizationdifferent from a polarization of the first device light. In yet further embodiments, the seconddiffuser assembly may comprise at least a second diffuser. Especially, in embodiments, the second diffuser assembly may be configured to diffuse at least part of second device light received by the second diffuser assembly into second diffused device light. In embodiments, the redirection optics may comprise a first redirection optical element and a second redirection optical element. Especially, in embodiments, the first redirection optical elementmay be configured to reflect the luminescent material light in an optical path to the light exit.Additionally, in such embodiments, the first redirection optical element may be configured to transmit the second diffused device light in an optical path to the light exit. Additionally, insuch embodiments, the first redirection optical element may be configured to reflect ortransmit light having the first centroid wavelength (λc1) in dependence of its linear polarization. Alternatively, in embodiments, the first redirection optical element may be configured to transmit the luminescent material light in an optical path to the light exit. In such alternative embodiments, the first redirection optical element may further be configured to reflect the second diffused device light in an optical path to the light exit. Further, in suchalternative embodiments, the first redirection optical element may be configured to reflect or 2023PF80437 4 transmit light having the first centroid wavelength (λc1) in dependence of its linear polarization. Especially, the first redirection optical element may be configured to direct a part of the first device light having a first linear polarization in an optical path to the luminescent material and to direct another part of the first device light having a second linear polarization (different from the first linear polarization) in an optical path to the first diffuserassembly. Conversely, in embodiments, the second redirection optical element may beconfigured to direct light having the first centroid wavelength (λc1) in an optical path to the first diffuser assembly. Additionally, in such embodiments, the second redirection optical element may be configured to transmit the second diffused device light in an optical path to the first redirection optical element. Optionally, in such embodiments, the second redirection optical element may further be configured to reflect the second device light in an optical path to the second diffuser assembly. Alternatively, in embodiments, the second redirection optical element may be configured to direct light having the first centroid wavelength (λc1) in an optical path to the first diffuser assembly. Additionally, in such alternative embodiments,the second redirection optical element may be configured to reflect the second diffuseddevice light in an optical path to the first redirection optical element. Optionally, in such alternative embodiments, the second redirection optical element may further be configured to transmit the second device light in an optical path to the second diffuser assembly. Furthermore, in embodiments, the polarization control system may be configured to control the polarization of the first device light reaching the first redirection optical element. In embodiments, the light generating system may be configured to generate in a first operational mode of the light generating system white system light. Especially, in embodiments, in thefirst operational mode of the light generating system the white system light may comprise atleast part of the luminescent material light, at least part of the first diffused device light, and at least part of the second diffused device light. Furthermore, in embodiments, the control system may be configured to control one or more of a spectral power distribution, acorrelated color temperature, and a color rendering index of the system light. Hence, inembodiments, the invention provides a light generating system comprising a first light generating device, a second light generating device, a luminescent material, a control system, redirection optics, a polarization control system, a first diffuser assembly, a second diffuser assembly, and a light exit; wherein: (A) the first light generating device may be configured to provide first device light having a first centroid wavelength (λc1) selected from the wavelength range of 440-490 nm, wherein the first light generating device may comprise a first solid state light source; wherein the first device light reaching the redirection optics may 2023PF80437 5 comprise linear polarized light; (B) the second light generating device may be configured to provide second device light having a second centroid wavelength (λc2) selected from the wavelength range of 600-780 nm, wherein the second light generating device may comprise a second solid state light source; wherein the solid state light sources (10,20) are individually selected from the group comprising laser diodes, superluminescent diodes, and stacked multi- junction light-emitting diodes; wherein the solid state light sources may be individually selected from the group comprising laser diodes, superluminescent diodes, and stacked multi-junction light-emitting diodes; (C) the luminescent material may be configured to convert atleast part of first device light received by the luminescent material into luminescent materiallight; (D) the first diffuser assembly may comprise a polarization converter and a firstdiffuser; wherein the first diffuser assembly may be configured to diffuse at least part of firstdevice light received by the first diffuser assembly into first diffused device light having the first centroid wavelength (λc1) and having a linear polarization different from a polarization of the first device light; (E) the second diffuser assembly may comprise at least a second diffuser; wherein the second diffuser assembly may be configured to diffuse at least part ofsecond device light received by the second diffuser assembly into second diffused devicelight; (F) the redirection optics may comprise a first redirection optical element and a secondredirection optical element; wherein (F1) the first redirection optical element may beconfigured (a) to (i) reflect the luminescent material light in an optical path to the light exit, (ii) transmit the second diffused device light in an optical path to the light exit, and (iii) reflect or transmit light having the first centroid wavelength (λc1) in dependence of its linear polarization, or (b) to transmit the luminescent material light in an optical path to the light exit, (ii) reflect the second diffused device light in an optical path to the light exit, and (iii) reflect or transmit light having the first centroid wavelength (λc1) in dependence of its linear polarization; wherein the first redirection optical element may be configured to direct a part of the first device light having a first linear polarization in an optical path to the luminescent material and to direct another part of the first device light having a second linear polarization(different from the first linear polarization) in an optical path to the first diffuser assembly;(F2) the second redirection optical element may be configured (a) to (i) reflect light havingthe first centroid wavelength (λc1), (ii) transmit the second diffused device light in an optical path to the first redirection optical element, and optionally (iii) reflect the second device lightin an optical path to the second diffuser assembly, or (b) to (i) transmit light having the firstcentroid wavelength (λc1), (ii) reflect the second diffused device light in an optical path to the first redirection optical element, and optionally (iii) transmit the second device light in an 2023PF80437 6optical path to the second diffuser assembly; (G) the polarization control system may beconfigured to control the polarization of the first device light reaching the first redirectionoptical element; (H) the light generating system may be configured to generate in a firstoperational mode of the light generating system white system light comprising at least part of the luminescent material light, at least part of the first diffused device light, and at least partof the second diffused device light; and (I) the control system may be configured to controlone or more of a spectral power distribution, a correlated color temperature, a color gamut and a color rendering index of the system light. With such a system, a high power light generating system may be provided. Further, such a system may allow control of the spectral power distribution and correlated color temperature of the system light (of a high power system), in dependence of the(controllable) polarization of light. Yet, such system may in a safe way provide high powerlight. The system may be relatively compact. Yet, thermal management of the luminescent material may also be provided with this system. In addition to high optical power, the system may also provide high radiance (or luminance), i.e., a high optical power density of the source. The invention may further provide light engine architectures that may be operatedwith two (independent) laser banks at (constant) equal, optimal (e.g., most efficient), ormaximum drive currents, while using the same etendue as that of a single laser bank and while providing a tunable CCT. Especially, the herein provided light engine architectures may provide light where any color point in a predetermined range on or near the BBL may be selected while fully utilizing the first light generating device. Furthermore, with such a system, the tunable CCT may be easily factory-calibrated with respect to the requested colorpoint (selected from a relatively large gamut area). Yet further, with such a system the colorpoint may easily be adjusted by the user, for any of the color points selected in apredetermined range of white light output color points (e.g. 2000 – 10000 K), whileproviding highly efficient collection of all the spectral contributions to the output light,resulting in a relatively high efficiency high brightness white light engine. Hence, theinvention may provide a tunable laser-phosphor source with increased gamut area. Theinvention may especially do so by combining a blue laser bank, a red laser bank, and a (yellow-)green luminescent material with an adjustable fraction of blue usage for the luminescent conversion, while being operated in continuous wave mode. With such a system,in addition, the CRI may be improved to values ≥ 80 for any selected CCT, especially thanksto the addition of narrow-band red device light. 2023PF80437 7 The light generating system (or “system”) may thus comprise a first light generating device, a second light generating device, a luminescent element, a control system, redirection optics, a polarization control system, a first diffuser assembly, a second diffuserassembly, and a light exit. The light generating system may especially apply two lightgenerating devices (especially laser banks), of which (i) the first light generating device may emit blue device light and may be operated at a constant power (or drive current) while the system may be set to any of the CCTs in a predetermined range of color points and (ii) the second light generating device may emit red device light and may be operated at an adjustable drive current. Here below, embodiments of the different elements of the light generating system will be described in further detail. The light generating devices may be configured to generate device light. Therefore, in embodiments, the light generating devices may each comprise a solid-state light source. In embodiments, the light generating devices may comprise (at least) a first lightgenerating device and a second light generating device (and optionally further lightgenerating devices). 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 multi-junction light-emitting diode (LED). The first light generating device may herein also comprise a plurality of first (solid state) light sources. Especially, inspecific embodiments, the first light generating device may comprise a first laser bankcomprising 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 ascollimating lenses comprising one lens per laser diode (e.g. arranged in an array of lenses, seealso 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. Further, in embodiments, the first light generating device may especially beconfigured 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) selectedfrom the wavelength range of 400-500 nm, such as from the range of 400-490 nm, like fromthe range of 430-490 nm. More especially, in embodiments, the first device light may have a 2023PF80437 8 first centroid wavelength (λc1) selected from the wavelength range of 440-490 nm, such as from the wavelength range of 450-480 nm. Hence, in embodiments, the first device light may be blue light. The term “centroid wavelength”, also indicated as λc, is known in the art, and refers to the wavelength value where half of the light energy is at shorter and half the energy is at longer wavelengths; the value is stated in nanometers (nm). It is the wavelength that divides the integral of a spectral power distribution into two equal parts as expressed by the formula λc = Σ λ*I(λ) / (Σ I(λ), where the summation is over the wavelength range of interest, and I(λ) is the spectral energy density (i.e. the integration of the product of the wavelength and the intensity over the emission band normalized to the integrated intensity). The centroid wavelength may e.g. be determined at operation conditions. Analogously to the first light generating device, 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. Further, in embodiments, the second light generating device may especially beconfigured to generate second device light having a second centroid wavelength (λc2).Especially, in embodiments, the second device light may have a second centroid wavelength(λc2) selected from the wavelength range of 590-780 nm, such as from the range of 600-780nm, like from the range of 620-750 nm. Such wavelengths may be beneficial as longerwavelengths may be useful to increase color rendering and color gamut. However, much lower wavelengths than described here may not be desirable because the lower the wavelength becomes, the larger the negative impact (e.g.. loss of optical power) of cutting out part of the luminescent spectral power. Hence, in embodiments, the second device lightmay be red light. 2023PF80437 9 Especially, in embodiments, the first centroid wavelength (λc1) and the secondcentroid wavelength (λc2) may be different, i.e. |λc1-λc2|≥50 nm, such as |λc1-λc2|≥60 nm, like|λc1-λc2|≥70 nm, like e.g. |λc1-λc2|≥100 nm.In embodiments, the first light generating device may adjustably be used forirradiating (or “pumping”) one or more of (i) the luminescent material to provide luminescentmaterial light and (ii) the first diffuser assembly to provide first diffused device light, see alsofurther below. Especially, in embodiments, the first light generating device may adjustably beused for irradiating both (i) the luminescent material to provide luminescent material light (to the output (white) system light) and (ii) the first diffuser assembly to provide first diffused device light, especially to provide a blue diffused device light contribution to the output (white) system light. In embodiments, the second light generating device may be (essentially fully) used for irradiating the second diffuser assembly to provide second diffused device light, especially to provide a red diffused device light contribution to the output (white) system light, see also further below. Note that, in embodiments, the light generating system may comprise further light generating devices, such as e.g. an optional third (and fourth etc.) light generating device configured to generate third (and fourth etc.) device light. Such a third light generating device may, in embodiments, comprise a third laser bank comprising a plurality of third light generating devices. In such embodiments, the third device light may e.g. be combined withthe other beams of light through (polarization or dichroic) multiplexing using one or moreadditional (polarizing or dichroic) beam combiners.In embodiments, the first light generating device and the second lightgenerating device may be configured to provide first device light and second device light,respectively, (optionally via further optics, see also further below) to the redirection optics. Redirection optics may be applied to combine light propagating along two different optical paths in a single optical path. Especially, two orthogonal propagating beams of light, received by the redirection optics, may be combined in a single beam of light. Herein, the redirection optics may especially be configured to (re-)direct (such as transmit or reflect) light received by the respective redirection optics. The redirection optics mayespecially do so assuming irradiation with the optical axis of the received light at an(average) angle of incidence relative to a surface normal of the redirecting plane (of theredirection optics) of 45±5°, such as 45±2°. 2023PF80437 10 The phrase “... light received by ...”, and similar phrases, such as “device light received by the first redirection optical element” may especially indicate that when the light is actually received by an item, an action may take place. The action may in embodiments be one or more of conversion, reflection, and transmission. Further, the action may also include refraction. Whether or not such item receives light may e.g. depend on e.g. a controlling mode (for instance whether or not a light generating device provides light). The redirection optics may, in embodiments, comprise a first redirection optical element and a second redirection optical element. In embodiments, (in an operational mode of the light generating system) the first redirection optical element may be configured downstream of both the first lightgenerating device and the second light generating device. In other words, in embodiments, inan operational mode of the light generating system the first redirection optical element may be configured in a light-receiving relationship with the first light generating device, thus receiving first device light. Note that herein, in embodiments, the light generating system may be operatedin a plurality of (different) operational modes, such as the first operational mode indicatedabove. Furthermore, in embodiments, the term “first operational mode” may herein also refer to a plurality of (different) first operational modes. Hence, similarly, in embodiments, in an operational mode of the light generating system the first redirection optical element may be configured in a light-receiving relationship with the second light generating device, thus receiving second device light (after being diffused into second diffused device light). The terms “upstream” and “downstream” relate to an arrangement of items or features relative to the propagation of the light from a light generating means (here the especially the light source), wherein relative to a first position within a beam of light from the light generating means, a second position in the beam of light closer to the light generating means is “upstream”, and a third position within the beam of light further away from the light generating means is “downstream”. In embodiments, the first device light received by the first redirection optical element may especially be polarized light or a polarization may be imposed to the first devicelight, e.g. with a polarizer. Hence, the light generating system may be configured such thatthe first device light reaching the first redirection optical element may comprise polarizedlight. In embodiments, the first device light reaching the first redirection optical element mayespecially comprise linear polarized first device light, such as e.g. p-polarized first device light and / or s-polarized first device light. The first light generating device may, in 2023PF80437 11 embodiments, be configured to provide linear polarized first device light. Additionally or alternatively, in embodiments, the first device light may be unpolarized or elliptically (suchas circularly) polarized light and a polarization control system (e.g. comprising a polarizer,see also further below) may be configured such that linear polarized first device light may be provided to the redirection optical element. The first redirection optical element may further, in embodiments, beconfigured upstream of the luminescent material relative to the first device light. As such, inembodiments, the luminescent material may be configured in a light-receiving relationshipwith the first redirection optical element. Especially, in embodiments, the first redirection optical element may be configured to direct at least part of the first device light received by the first redirection optical element in an optical path to the luminescent material. Moreover, in embodiments, the first redirection optical element may be configured to direct at least another part of the first device light received by the first redirection optical element in an optical path to the first diffuser assembly. The first redirection optical element may especially be configured to (re-)direct light having the first centroid wavelength (λc1) in dependence of its polarization. In embodiments, the first redirection optical element may be configured totransmit first device light (received by the first redirection optical element and) having a firstlinear polarization. Further, in such embodiments, the first redirection optical element may beconfigured to reflect first device light (received by the first redirection optical element and) having a second linear polarization. Alternatively, in embodiments, the first redirection optical element may be configured to reflect first device light (received by the first redirection optical element and) having a first linear polarization. Further, in such embodiments, the first redirection optical element may be configured to transmit first device light (received by the first redirection optical element and) having a second linear polarization. Hence, in embodiments, the first redirection optical element may function as a polarizing beam splitter. Furthermore, in embodiments, the first redirection optical element may function as a partially polarizing beam splitter. For example, in embodiments, the first redirection optical element may be configured partly transmissive for first device light havingthe first linear polarization while being essentially fully reflective for first device light havingthe second linear polarization, or vice versa. Hence, in such embodiments, at least part of first device light having the first linear polarization and at least part of first device light having the second linear polarization may propagate from the first redirection optical element in an optical path to the luminescent material. 2023PF80437 12 In embodiments, the second linear polarization may especially be different from the first linear polarization. Especially, in some embodiments the first linear polarization may be p-polarization and the second linear polarization may be s-polarization.In other embodiments, the first polarization may be s-polarization and the second polarizationmay be p-polarization. Herein, the terms “p-polarization” and “s-polarization” may especially refer to the polarization of light when incident on (a light-receiving plane of) the light- receiving element, such as e.g. the first redirection optical element. Hence, in embodiments, the first redirection optical element may be configured to transmit p-polarized light received by the first redirection optical element and to reflect s-polarized light received by the first redirection optical element. Additionally or alternatively, in embodiments, the first redirection optical element may be configured to transmit s-polarized light received by the redirection optical element and to reflect p-polarized light received by the first redirection optical element. Especially, in some embodiments, the first redirection optical element may be configured such that a ratio of the amount of s-polarized light being transmitted relative to the amount of p-polarized light being transmitted may be ≤0.9, such as ≤0.8, like ≤0.6, especially ≤0.4. Similarly, in some embodiments, the first redirection optical element may be configured such that a ratio of the amount of p-polarized light being reflected relative to the amount of s-polarized light being reflected may be ≤0.9, such as ≤0.8, like ≤0.6, especially ≤0.4. Yet alternatively, in embodiments, the first redirection optical element may be configured to partially transmit and partially reflect one or more of light comprising the first linear polarization and light comprising the second linear polarization, see also above. In specific embodiments, the (partially polarizing) first redirection optical element may be configured (i) essentially 100% reflective for s-polarized device light or (ii) essentially 100% transmissive for p-polarized device light. Such embodiments may especially provide relatively high system efficiency due to minimization of loss of light at the first redirection optical element. Amounts, ratio’s, and / or percentages of light may be based on the spectral power (of the respective light) (e.g. Watts). Herein, in embodiments, the polarization of the first device light may be selected (e.g. by factory setting or via the polarization control system, see also further below) such that at least part of the first device light may be directed by the first redirection optical element in an optical path to the luminescent material and at least another part of the first device light may be directed by the first redirection optical element in an optical path to thediffuser assembly. Hence, in embodiments, the first redirection optical element may beconfigured to direct (i.e. transmit or reflect) at least part of the first device light (received by 2023PF80437 13 the first redirection optical element) in an optical path to the luminescent material. Especially, in embodiments, the first redirection optical element may be configured to direct (i.e. transmit or reflect) at least 60%, such as at least 70%, especially at least 80% of the first device light (received by the first redirection optical element) in an optical path to the luminescent material. More especially, in embodiments, the first redirection optical element may be configured to direct (i.e. transmit or reflect) at least 90%, such as at least 95%, especially at least 98%, including in some embodiments (essentially) 100% of the first device light (received by the first redirection optical element) in an optical path to the luminescent material. Further, in embodiments, the first redirection optical element may be configured to direct (i.e. reflect or transmit) at least another part of the first device light (received by thefirst redirection optical element) in an optical path to the first diffuser assembly (via thesecond redirection optical element). Especially, in embodiments, the first redirection optical element may be configured to direct (i.e. reflect or transmit) at most 50%, such as at most 40%, especially at most 30% of the first device light (received by the first redirection optical element) in an optical path to the first diffuser assembly. More especially, in embodiments, the first redirection optical element may be configured to direct (i.e. reflect or transmit) at most 20%, such as at most 10%, especially at most 5%, including in some embodiments (essentially) 0% of the first device light (received by the first redirection optical element) inan optical path to the first diffuser assembly. For example, in embodiments, the firstredirection optical element may be configured to transmit 70% (e.g. the p-polarized part) of the first device light (received by the first redirection optical element) in an optical path to the luminescent material and to reflect 30% (e.g. the s-polarized part) of the first device light (received by the first redirection optical element) in an optical path to the first diffuser assembly. In an alternative example, in embodiments, the first redirection optical element may be configured to reflect 70% (e.g. the s-polarized part) of the first device light (received by the first redirection optical element) in an optical path to the luminescent material and to transmit 30% (e.g. the p-polarized part) of the first device light (received by the firstredirection optical element) in an optical path to the first diffuser assembly. In embodiments,the luminescent material may be configured to convert light received by the luminescent material into luminescent material light. Especially, in embodiments, the luminescent material may be configured to convert first device light received by the luminescent material into luminescent material light. The luminescent material is configured to convert at least part of first radiation (selected from one or more of UV radiation and visible radiation), into luminescent material light. Especially, in embodiments the luminescent material may be 2023PF80437 14 configured to convert at least part of blue light (as radiation) into luminescent material light. Especially when blue light is partly converted, the blue light may be used as source of blue light (for the device 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 first 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 asat least 60%, like at least 70% of the first 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%, including100% of the first device light received by the luminescent material (arrangement) intoluminescent material light. Herein, the luminescent material light may have a third centroid wavelength (λc3). Especially, in embodiments, the luminescent material light may have a third centroid wavelength (λc3) selected from the wavelength range of λc1≤ λc3≤ λc2, especially in the range of (λc1+10 nm) ≤ λc3≤ (λc2-10 nm), such as in the range of (λc1+20 nm) ≤ λc3≤ (λc2-20 nm). Such embodiments may be beneficial, as the addition of light having a wavelength selected from the range between the blue device light and the red device light (especially green-yellow light) may improve the color rendering index of the output white system light, as wellas the correlated color temperature. Therefore, in embodiments, the luminescent material light may have a third centroid wavelength (λc3) selected from the wavelength range of 490- 620 nm, such as from the range of 500-600 nm, like from the range of 510-590 nm. In specific embodiments, the third centroid wavelength (λc3) may be selected from the wavelength range of 495-570 nm (i.e. the green wavelength range, see also further below). 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 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 2023PF80437 15 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 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. In general, the luminescent material will be a down converter, i.e. radiation of a smaller wavelength is converted into radiation with a larger wavelength (λex<λem), though in specific embodiments the luminescent material may comprise up-converter luminescent material, i.e. radiation of a larger wavelength is converted into radiation with a smaller wavelength (λex>λem). In embodiments, the term “luminescence” may refer to phosphorescence. In embodiments, the term “luminescence” may also refer to fluorescence. Instead of the term “luminescence”, also the term “emission” may be applied. Hence, the terms “first radiation” and “second radiation” may refer to excitation radiation and emission (radiation), respectively. Likewise, the term “luminescent material” may in embodiments refer to phosphorescence and / or fluorescence. The term “luminescent material” may also refer to a plurality of different luminescent materials. Hence, the term “luminescent material” may in specific embodiments also refer to a luminescent material composition. The term “luminescent material” herein may also refer to a material comprising a luminescent material, such as a light transmissive host comprising the luminescent material. Examples of possible luminescent materials are indicated further below. Referring back to the redirection optics, in embodiments, the first redirection optical element may further be configured downstream of the luminescent material and thesecond redirection optical element, and upstream of the light exit (note that, the firstredirection optical element may thus be configured both (i) downstream of the first light generating device relative to the first device light and of the luminescent material relative to the luminescent material light, and also (ii) upstream of the luminescent material relative to the first device light and of the light exit relative to the luminescent material light). As such, in embodiments, the first redirection optical element may be configured in a light-receiving relationship with the luminescent element. Especially, in embodiments, the first redirection 2023PF80437 16 optical element may be configured to direct at least part of the luminescent material light received by the first redirection optical element in an optical path to the light exit. Additionally, in embodiments, the first redirection optical element may be configured in a light-receiving relationship with the second redirection optical element. Especially, in embodiments, the first redirection optical element may be configured to direct at least part of the (first and / or second) diffused device light received by the first redirection optical elementin an optical path to the light exit. In specific embodiments, the first redirection opticalelement may be configured to reflect one of the luminescent material light and the (first and / or second) diffused device light received by the first redirection optical element, and to transmit the other one of the luminescent material light and the (first and / or second) diffused device light received by the first redirection optical element. In specific embodiments, the first redirection optical element may be configured to (i) reflect the luminescent material light in an optical path to the light exit, (ii) transmit the second diffused device light in an optical path to the light exit, and (iii) reflect or transmit light having the first centroid wavelength (λc1) (i.e. first (diffused) device light) in dependence of its linear polarization. Especially, in such embodiments, the first redirection optical element may be configured to (i) reflect the luminescent material light in an optical path to the light exit, (ii) transmit the second diffused device light in an optical path to the light exit, (iii) substantially transmit light having the first centroid wavelength (λc1) (i.e. first (diffused) device light and having the first linear polarization, and (iv) at least partly reflect light having the first centroid wavelength (λc1) (i.e. first (diffused) device light and having the second linear polarization. In alternative specific embodiments, the first redirection optical element may be configured to (i) transmit the luminescent material light in an optical path to the light exit, (ii) reflect the second diffused device light in an optical path to the light exit, and (iii) transmit or reflect light having the first centroid wavelength (λc1) (i.e. first (diffused)device light) in dependence of its linear polarization. Especially, in such embodiments, thefirst redirection optical element may be configured to (i) transmit the luminescent material light in an optical path to the light exit, (ii) reflect the second diffused device light in an optical path to the light exit, (iii) substantially reflect light having the first centroid wavelength (λc1) (i.e. first (diffused) device light and having the first linear polarization, and (iv) at least partly transmit light having the first centroid wavelength (λc1) (i.e. first (diffused) device light and having the second linear polarization. Note that, in embodiments, the first redirection optical element may thus combine multiple different beams of light (i.e. the luminescent material light, the first 2023PF80437 17 diffused device light, and the second diffused device light) in a same optical path to the light exit. Hence, in some embodiments, the first redirection optical element may also function as a beam combiner. Herein, the phrase “to combine X and Y into a same optical path” and similar phrases may refer to the respective beams of light being provided 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. In embodiments, (in an operational mode of the light generating system) the second redirection optical element may be configured downstream of both the first lightgenerating device and the second light generating device (note that, the second redirectionoptical element may thus be configured both (i) downstream of the light generating devices relative to the device light and of the diffuser assemblies relative to the diffused device light, and also (ii) upstream of the diffusers relative to the device light and of the light exit relative to the diffused device light). In other words, in embodiments, in an operational mode of the light generating system the second redirection optical element may be configured in a light- receiving relationship with the first light generating device, thus receiving part of the first device light (after being redirected by the first redirection optical element). Similarly, in embodiments, in an operational mode of the light generating system the second redirection optical element may be configured in a light-receiving relationship with the second light generating device, thus receiving second device light. In some embodiments, the second device light received by the first redirection optical element may especially be polarized light or a polarization may be imposed to thesecond device light, e.g. with a polarizer. Hence, in embodiments, the light generating systemmay be configured such that the second device light reaching the second redirection optical element may comprise polarized light. In specific embodiments, the second device light reaching the redirection optics may comprise (substantially) linear polarized light. Especially, in embodiments, the second device light reaching the redirection optics may essentially be linear polarized light. However, this may not necessarily be the case. Especially, in embodiments where the second diffuser comprises a reflective diffuser, the second device light reaching the second redirection optical element may comprise linear polarized light. Alternatively, in embodiments where the second diffuser comprises a transmissive diffuser (see also further below), the second device light reaching the second redirection optical element may have essentially any polarization. Hence, in some embodiments, the second 2023PF80437 18 device light reaching the second redirection optical element may comprise unpolarized light, linear polarized light, or elliptically polarized light. In embodiments, the second device light reaching the second redirection optical element may especially comprise linear polarized second device light, such as e.g. p- polarized second device light or s-polarized second device light. The second light generating device may, in embodiments, be configured to provide linear polarized second device light. Additionally or alternatively, in embodiments, the second device light may be unpolarized orelliptically (such as circularly) polarized light (and optionally the polarization control system(see also further below) may be configured such that linear polarized second device light may be provided to the second redirection optical element). The second redirection optical element may further, in embodiments, be configured upstream of the first diffuser assembly. As such, in embodiments, the first diffuserassembly may be configured in a light-receiving relationship with the second redirectionoptical element. Especially, in embodiments, the second redirection optical element may beconfigured to direct (at least part of) the first device light received by the second redirectionoptical element in an optical path to the first diffuser assembly. In some embodiments, the second redirection optical element may also be configured upstream of the second diffuser assembly. As such, in embodiments, the second diffuser assembly may be configured in a light-receiving relationship with the second redirection optical element. Especially, in embodiments, the second redirection optical element may be configured to direct (at least part of) the second device light received by the second redirection optical element in an optical path to the second diffuser assembly. In suchembodiments, the second redirection optical element may especially be configured to (re-)direct light having the second centroid wavelength (λc2) in dependence of its polarization. Hence, in embodiments, the second redirection optical element may function as a polarizing beam splitter. Alternatively, in embodiments, the second redirection optical element may be configured downstream of the second diffuser assembly. In such embodiments, the second redirection optical element may be configured in a light-receiving relationship with the second diffuser assembly. Especially, in embodiments, the second diffuser assembly may be configured to provide second diffused device in an optical path to the second redirection optical element. Such embodiments may especially apply when the second diffuser assembly may comprise a transmissive second diffuser, see also further below. Furthermore, in embodiments, the second redirection optical element mayfurther be configured downstream of the first diffuser assembly (relative to the first diffused 2023PF80437 19device light) and the second diffuser assembly (relative to the second diffused device light),and upstream of the first redirection optical element (relative to the first and / or seconddiffused device light). As such, in embodiments, the second redirection optical element beconfigured in a light-receiving relationship with the first diffuser assembly. Especially, inembodiments, the second redirection optical element may be configured to direct at least partof the first diffused device light received by the second redirection optical element in anoptical path via the first redirection optical element to the light exit. Additionally, inembodiments, the second redirection optical element may be configured in a light-receivingrelationship with the second diffuser assembly. Especially, in embodiments, the secondredirection optical element may be configured to direct at least part of the second diffuseddevice light received by the second redirection optical element in an optical path via the firstredirection optical element to the light exit. In specific embodiments, the second redirectionoptical element may be configured to reflect one of the first diffused device light and thesecond diffused device light received by the second redirection optical element, and totransmit the other one of the first diffused device light and the second diffused device lightreceived by the second redirection optical element.In embodiments, the second redirection optical element may be configured to (in dependence of its polarization) transmit or reflect first device light received by the second redirection optical element in an optical path to the first diffuser assembly. Further, in embodiments, the second redirection optical element may be configured to (in dependence of its polarization) transmit or reflect first diffused device light received by the second redirection optical element in an optical path to the (light exit via the) first redirection optical element. Furthermore, in embodiments, the second redirection optical element may be configured to transmit or reflect second diffused device light received by the second redirection optical element in an optical path to the (light exit via the) first redirection optical element. Yet further, in embodiments (where the second diffuser assembly comprises a reflective second diffuser), the second redirection optical element may be configured to transmit or reflect (in dependence of its polarization) second device light received by the second redirection optical element in an optical path to the second diffuser assembly. In specific embodiments, the second redirection optical element may beconfigured to reflect light having the first centroid wavelength (λc1) (received by the second redirection optical element). Especially, in specific embodiments, the second redirection optical element may be configured to reflect first device light received by the second redirection optical element in an optical path to the first diffuser assembly and to reflect first 2023PF80437 20 diffused device light received by the second redirection optical element in an optical path to the first redirection optical element. Furthermore, in such embodiments, the secondredirection optical element may be configured to transmit the second diffused device light(received by the second redirection optical element) in an optical path to the first redirection optical element, and optionally to reflect the second device light (received by the second redirection optical element) in an optical path to the second diffuser assembly. Alternatively, in specific embodiments, the second redirection optical element may be configured to transmit light having the first centroid wavelength (λc1) (received by the second redirection optical element). Especially, in specific embodiments, the second redirection optical element may be configured to transmit first device light received by the second redirection optical element in an optical path to the first diffuser assembly and to transmit first diffused device light received by the second redirection optical element in anoptical path to the first redirection optical element. Furthermore, in such embodiments, thesecond redirection optical element may be configured to reflect the second diffused device light (received by the second redirection optical element) in an optical path to the first redirection optical element, and optionally to transmit the second device light (received by the second redirection optical element) in an optical path to the second diffuser assembly. Note that, in embodiments, the second redirection optical element may thuscombine multiple different beams of light (i.e. the first diffused device light, and the second diffused device light) in a same optical path to the first redirection optical element. Hence, insome embodiments, the second redirection optical element may also function as a beamcombiner. As indicated above, in embodiments, part of the first device light received bythe second redirection optical element may be directed to the first diffuser assembly. Inembodiments, the first diffuser assembly may comprise a first (surface) diffuser. Especially,in embodiments, the first 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 first diffuser assembly may comprise a polarization converter. Especially, inembodiments, the polarization converter may comprise a birefringent rotator, more especiallya λ / 4 waveplate. As known from the art, a waveplate or retarder is an optical device that alters the polarization state of a light wave travelling through it. A halfwave plate may shift the polarization direction of linear polarized light (especially from s to p or from p to s polarization), and a quarter-wave plate may convert linear polarized light into elliptically 2023PF80437 21 (such as especially circularly) polarized light (and vice versa). The λ / 4 waveplate may especially be configured between (relative to the propagation of light through the system) thesecond redirection optical element and the first diffuser. In embodiments, the secondredirection optical element may thus be configured to direct first device light received by thesecond redirection optical element and comprising (either) the first linear polarization or thesecond linear polarization (optionally via optics) to the polarization converter (i.e. the λ / 4waveplate). The λ / 4 waveplate may, in embodiments, be configured to convert first devicelight received by the λ / 4 waveplate comprising a linear polarization into first device lighthaving a (first) circular polarization. At the first diffuser, in embodiments, the first devicelight having the (first) circular polarization may be diffused into (first) diffused device light having a second circular polarization. Therefore, in embodiments, the λ / 4 waveplate may also be configured to convert (first) diffused device light received by the λ / 4 waveplate (via the first diffuser) and having the (second) circular polarization into (first) diffused device lightcomprising a linear polarization. For example, in embodiments, p-polarized third device lightmay be directed by the second redirection optical element to the λ / 4 waveplate. In suchembodiments, the λ / 4 waveplate may be configured to convert the p-polarized first devicelight into left-handed circularly polarized first device light. Further, in such embodiments, thefirst diffuser may be configured to diffuse the left-handed circularly polarized first devicelight received by the first diffuser into right-handed circularly polarized first diffused devicelight. The λ / 4 waveplate may then, in embodiments, be configured to convert the right-handed circularly polarized first diffused device light received by the λ / 4 waveplate (back) tolinear polarized light, especially to s-polarized first diffused device light. However, inembodiments, different polarizations and conversions from the example described here maybe possible too, such as e.g. starting from s-polarized first device light. Hence, inembodiments, the first diffuser assembly may comprise an arrangement of a polarizationconverter and a first diffuser. The first diffuser may, in embodiments, be configured to diffuse at least partof the first device light received by the first diffuser assembly into first diffused device light.Especially, in embodiments, the first diffuser may be configured to diffuse at least 50%, such as at least 60%, like at least 70% of the first device light received by the first diffuserassembly into first diffused device light. Especially, in embodiments, the first diffuser may beconfigured to diffuse at least 80%, more especially at least 90%, including 100% of the firstdevice light received by the first diffuser assembly into first diffused device light. Inembodiments, the first diffuser may especially comprise a substantially polarization 2023PF80437 22 maintaining diffuser, i.e., the first diffuser may be configured to substantially maintain the polarization of the incident light upon diffusion (and in some embodiments reflection). Such embodiments may be beneficial as depolarization at the first diffuser may be reduced,therewith improving the efficiency of the contribution of the first diffuser assembly to thesystem light. Therefore, in embodiments, the first 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 first diffuser due to some absorption of incident device light. In embodiments, the first diffuser may comprise a (polarization maintaining) reflective diffuser. Alternatively, in embodiments, the first diffuser may comprise a (polarization maintaining) transmissive diffuser. In such embodiments, the first diffuser may especially comprise a small angle transmissive diffuser. Herein, the term “small angle transmissive diffuser” may especially refer to a transmissive diffuser for which the FWHM of a diffused beam of light may be ≤30°, such as ≤20°, like ≤10°, especially, ≤5°. Furthermore, in such embodiments, the first diffuser assembly may comprise a reflector. The reflector may, in embodiments, be configured downstream of the first diffuser. In other words, the first diffuser may be configured between the reflector and the second redirection optical element. In embodiments, the reflector may especially comprise a specular reflector. As indicated above, in embodiments, second device light received by the second redirection optical element may be directed to the second diffuser assembly. In embodiments, the second diffuser assembly may comprise a second (surface) diffuser. Especially, in embodiments, the second 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 some embodiments, the second diffuser assembly may (also) comprise a polarization converter, similar to the first diffuser assembly described above. The polarization converter,such as e.g. a λ / 4 waveplate, may especially be configured between (relative to thepropagation of light through the system) the second redirection optical element and the second diffuser. In embodiments, the second redirection optical element may thus be configured to direct second device light received by the second redirection optical element and comprising (either) the first linear polarization or the second linear polarization (optionally via optics) to the polarization converter (i.e. the λ / 4 waveplate). The λ / 4 waveplate may, in embodiments, be configured to convert second device light received by 2023PF80437 23 the λ / 4 waveplate comprising a linear polarization into second device light having a (first) circular polarization. At the second diffuser, in embodiments, the second device light having the (first) circular polarization may be diffused into (second) diffused device light having a second circular polarization. Therefore, in embodiments, the λ / 4 waveplate may also be configured to convert (second) diffused device light received by the λ / 4 waveplate (via the second diffuser) and having the (second) circular polarization into (second) diffused device light comprising a linear polarization. Hence, in embodiments, the second diffuser assembly may comprise an arrangement of a polarization converter and a second diffuser. The second diffuser may, in embodiments, be configured to diffuse at least part of the second device light received by the second diffuser assembly into second diffused device light. Especially, in embodiments, the second diffuser may be configured to diffuse at least 50%, such as at least 60%, like at least 70% of the second device light received by the second diffuser assembly into second diffused device light. Especially, in embodiments, the second diffuser may be configured to diffuse at least 80%, more especially at least 90%, including 100% of the second device light received by the second diffuser assembly into second diffused device light. In embodiments, the second diffuser may especially comprise a substantially polarization maintaining diffuser, similarly as described above for the first diffuser. Alternatively, in embodiments, the second diffuser may comprise a (polarization maintaining) transmissive diffuser. In embodiments, the second diffuser may thus comprise a (polarization maintaining) reflective diffuser. In specific embodiments, the first diffuser and the second diffuser may both comprise (polarization maintaining) reflective diffusers. Alternatively, in specific embodiments, one or more of the first diffuser and the second diffuser may comprise a transmissive diffuser. For example, in embodiments, the second diffuser may comprise atransmissive diffuser. In specific embodiments, both of the first diffuser and the seconddiffuser may comprise transmissive diffusers. Such embodiments may provide the advantagethat some simpler beam splitters (i.e. less optical requirements needed for the redirection optical elements) may be used and the system may be more compact. Hence, in embodiments, the light generating system may be configured togenerate luminescent material light, first diffused device light, and second diffused devicelight. In embodiments, the redirection optics may be configured such that the luminescentmaterial light, the first diffused device light, and the second diffused device light maypropagate via part of the optics to the light exit. 2023PF80437 24 Herein, the light exit may refer to a position where system light escapes from the light generating system. This 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. The light generating system may thus, in embodiments, be configured to provide in the first operational mode of the light generating system at the light exit one or more of luminescent material light, first diffused device light, and second diffused device light. In other words, in such embodiments, (the system light comprising) one or more of luminescent material light, first diffused device light, and second diffused device light may emanate away from the light generating system via the light exit. In embodiments, the light generating system may especially be configured to generate system light comprising one or more of at least part of the luminescent material light, at least part of the first diffused device light, and at least part of the second diffused device light. Especially, in embodiments, thelight generating system may be configured to generate in the first operational mode of thelight generating system white system light comprising at least part of the luminescent material light, at least part of the first diffused device light, and at least part of the second diffused device light. In embodiments, the control system may be configured to control the systemlight (see also further below). Especially, in embodiments, the control system may beconfigured to control a spectral power distribution of the system light. Additionally or alternatively, 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. Yet additionally or alternatively, in embodiments, the control system may be configured to control a color gamutof the system light. The control system may especially be configured to control the spectralpower distribution by e.g. controlling the polarization control system (see also further below).Additionally or alternatively, in embodiments, the control system may be configured tocontrol the spectral power distribution by controlling the light generating devices. Especially,in such embodiments, the control system may be configured to control the polarization of atleast the first light generating device. Hence, in such embodiments, the amount of first devicelight having the first linear polarization and first device light having the second linearpolarization may be controlled by the control system, which may in turn be controlling thelight generating device and / or the polarization control system.In an operational mode of the light generating system, in embodiments, the system light may thus comprise (yellow-green) luminescent material light, (blue) first 2023PF80437 25 diffused device light, and (red) second diffused device light. Hence, in such embodiments, the system light may be white light. Especially, in embodiments, in an operational mode of the light generating system 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 2000-10000 K, especially from the range of 4000-9000 K, more especially from the range of 6500-8000 K. In specific embodiments, in an operational mode of the light generating system the system light may be white light having a correlated color temperature selected from the range of 2700-8000 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 and / or beam) 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, e.g. for backlighting purposes, or for other purposes, 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) may especially be within about 15 SDCM (standard deviation of color matching) from the BBL (black body locus), especially within about 10 SDCM from the BBL, even moreespecially within about 5 SDCM from the BBL. However, this may not necessarily be thecase. 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, incombination with a CRI of at least 70. In specific embodiments, in an operational mode ofthe light generating system the system light may be white light having a correlated color temperature selected from the range of 2000-10000 K and a color rendering index of at least 65. The light generating system as described herein may thus especially bedesigned to operate based on the application of two laser sources (in particular laser banks) 2023PF80437 26that may be efficiently operated and combined such that the system may be set to any of theCCTs in a predetermined range. The light generating system may especially make use ofa blue polarized light source and a red (polarized) light source. Through adjustment of the polarization of the output of the blue light source and beam splitting / combing via two discrete components: the first redirection optical element (comprising a combined polarizing and dichroic beam splitter) and a second redirection optical element (comprising a combined polarizing and dichroic beam splitter) tuneability of the output white system light may be achieved. In specific embodiments, in the first operational mode of the light generating system, the first light generating device may be configured to operate at a constant (first) drive current. Especially, in embodiments, the first light generating device may be configured to operate at its rated forward current. Herein the term “rated forward current” may especially refer to a rated (as done by a manufacturer) of the forward current which a solid state light source (as specified above) may carry without damaging the light generating device. Especially, in embodiments, the light generating devices may be configured to operate at a maximum operating condition complying with lifetime and efficiency boundary conditions. More especially, the light generating devices may be configured to operate at one of maximum efficiency, maximum output, their nominal rated current, or operation conditions with a chosen trade-off between output power, efficiency, and lifetime. Conversely, in embodiments, in the first operational mode of the light generating system, the second light generating device may be configured to operate at an adjustable (second) drive current. Hence, as such, tuneability of the blue light component inthe system light may be achieved though adjustment of the polarization of the first devicelight reaching the first redirection optical element, whereas tuneability of the red light component in the system light may be achieved through adjustment of the adjustable (second) drive current. In embodiments, the first redirection optical element and the second redirection optical element may each comprise one or more of a polarizing beam splitter (or polarizing beam combiner) and a dichroic beam splitter (or dichroic beam combiner). Herein, in embodiments, a polarizing beam splitter may comprise one or more of a plate polarizing beam splitter, a cube polarizing beam splitter, a thin film polarizing beam splitter, a crystal polarizing beam splitter, and a Brewster window. Cube beam splitters may especiallycomprise a thin-film dielectric stack configured between two half-cubes (especially in thediagonal plane), which thin-film dielectric stack may be optimized for the corresponding 2023PF80437 27 refractive index materials (i.e., in this case not air at one side but cube or substrate material at both sides of the stack). In specific embodiments, the second redirection optical element may be selected from the group comprising: a plate polarizing beam splitter, a cube polarizing beam splitter and a thin film polarizing beam splitter. Furthermore, in embodiments, a dichroic beam splitter may comprise one ormore of a (flat or tile-shaped) dichroic mirror (e.g. a flat plate or tile comprising a dichroiccoating), 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). Moreover, in embodiments, the first redirection optical element and / or thesecond redirection optical element may (each) comprise a polarizing beam splitter and adichroic beam splitter that may be (spatially) combined into a single redirection optical element. In embodiments, the first redirection optical element may comprise apolarizing beam splitter for light having a wavelength selected from the wavelength range of 400-490 nm, such as from the range of 440-490 nm, like from the range of 445-480 nm. In such embodiments, the first redirection optical element may further comprise additionalspectral requirements such that at least (a substantial) part of a spectral power of theluminescent material light received by the first redirection optical element may be directed(i.e. transmitted or reflected) to the light exit. Especially in embodiments, (the spectral requirement of) the first redirection optical element may be selected such that at least 60%, such as at least 70%, like at least 80%, especially at least 90%, more especially at least 95%, including 100% of the spectral power of the luminescent material light received by the first redirection optical element may be directed to the light exit. Additionally, in such embodiments, the first redirection optical element may further comprise additional spectral requirements such that at least (a substantial) part of a spectral power of the second diffused device light received by the first redirection optical element may be directed (i.e. transmitted or reflected) to the light exit. Especially in embodiments, (the spectral requirement of) the first redirection optical element may be selected such that at least 60%, such as at least 70%, like at least 80%, especially at least 90%, more especially at least 95%, including 100% of the spectral power of the second diffused device light received by the first redirection optical element may be directed to the light exit. In embodiments, such a spectral requirement as described above may e.g. beachieved by providing an optical layer (or coating) to the first redirection optical element. 2023PF80437 28 Especially, in embodiments, the optical layer may comprise one or more of a dichroically active layer and a spectral band filter, such as e.g. a notch filter or a band pass filter. Further, in embodiments, one or more such optical layers, such as an arrangement of such opticallayers, may be provided to the first redirection optical element. Especially, in embodiments,the first redirection optical element may comprise a combination of a polarizing beam splitter for light having a wavelength selected from the wavelength range of 440-490 nm, and a low-pass filter having a cut-off wavelength (λlp) selected from the range of λc3≤λlp≤λc2.In embodiments, first redirection optical element may thus comprise a low- pass filter. In such embodiments, the cut-off wavelength (λlp) (of the low-pass filter) may especially be selected such that a substantial part of the spectral power of the luminescent material light (received from a first direction by the first redirection optical element) may be combined into a same optical path to the light exit with the second diffused device light (received from a second direction orthogonal to the first direction by the first redirection optical element). Therefore, in embodiments, the cut-off wavelength (λlp) (of the low-pass filter) may be selected from the range of λc3≤λlp≤λc2, such as from the range of 550≤λlp≤650, like from the range of 570≤λlp≤630, especially from the range of 580≤λlp≤620. Furthermore, in some embodiments, the first redirection optical element maycomprise a band-reflection filter. Especially, in embodiments, the first redirection optical element may comprise a combination of a polarizing beam splitter for light having a wavelength selected from the wavelength range of 440-490 nm, and a band reflection filter configured to reflect light having a wavelength between a first cut-off wavelength (λbr1) and a second cut-off wavelength (λbr2). In other words, the first redirection optical element may comprise a combination of a polarizing beam splitter for light having a wavelength selected from the wavelength range of 440-490 nm, and a band reflection filter having a first cut-off wavelength (λbr1) selected from the range of λc3≤λbr1≤λc2and a second cut-off wavelength (λbr2) selected from the range of >λc2. Hence, in embodiments, the filter may be configured to reflect light having a wavelength selected from a narrow band of wavelengths and be configured to transmit light having a wavelength outside of the narrow band of wavelengths. In other words, in such embodiments, the band-reflection filter may have a first cut-off wavelength (λlp1) and a second cut-off wavelength (λlp2). For example, in such embodiments,the filter may be configured to transmit light having a wavelength below the first cut-offwavelength (λlp1) and above the second cut-off wavelength (λlp2), and to reflect light having awavelength selected between the first cut-off wavelength (λlp1) and the second cut-off wavelength (λlp2). For example, in embodiments, the filter may be configured to substantially 2023PF80437 29 transmit blue first diffused device light (which is further redirected in dependence of itspolarization), to reflect red second diffused device light (e.g. the first cut-off wavelength(λlp1) may be 500 nm and the second cut-off wavelength (λlp2) may be 620 nm), and tosubstantially transmit yellow-green luminescent material light. Especially, in embodiments,the band reflection filter may have a first cut-off wavelength (λbr1) selected from the range of λc3≤λbr1≤λc2 and a second cut-off wavelength (λbr2) selected from the range of >λc2. Therefore, in embodiments, the first cut-off wavelength (λbr1) (of the band reflection filter) may be selected from the range of λc3≤λbr1≤λc2, such as from the range of 550≤λbr1≤650, like from the range of 570≤λbr1≤630, especially from the range of 580≤λbr1≤620.Furthermore, in embodiments, the second cut-off wavelength (λbr2) may be selected from the range of >λc2, such as from the range of >620 nm, like from the range of >630 nm, especially from the range of >650 nm. In embodiments, the second cut-off wavelength (λbr2) may be selected from the range of 590-660 nm, such as from the range of 600-630 nm. Alternatively, in embodiments, the first redirection optical element maycomprise a combination of a polarizing beam splitter for light having a wavelength selected from the wavelength range of 440-490 nm, and a band reflection filter having a first cut-off wavelength (λbr1) selected from the range of λc1<λbr1≤λc3 and a second cut-off wavelength (λbr2) selected from the range of λc3≤λbr2≤λc2. For example, in embodiments, the filter may beconfigured to transmit blue first diffused device light (which is further redirected independence of its polarization), and red second diffused device light (e.g. the first cut-off wavelength (λlp1) may be 500 nm and the second cut-off wavelength (λlp2) may be 600 nm),and to substantially reflect yellow-green luminescent material light. Furthermore, in suchembodiments, the first redirection optical element may comprise a further low-pass filter having a cut-off wavelength (λlp) selected from the range of >λc2. Such embodiments may be beneficial as luminescent material light may generally have comprise a broad range of wavelengths, optionally including some wavelengths in the red wavelength range, which would without the low-pass filter be lost in the light generating system. Hence, by using a first redirection optical element comprising a polarizing beam splitter for blue light, a band- reflection filter, and a low-pass filter, the loss of (luminescent material) light may be reduced and thus the system efficiency may be increased. As described above, the polarization of the first device light may thus impactthe optical path the first device light may follow through the light generating system.Therefore, in embodiments, the light generating system may comprise a polarization controlsystem. The polarization control system may be configured to control the polarization of (at 2023PF80437 30least) the first device light (reaching the first redirection optical element). Hence, as such, thepolarization of the first device light may be controlled. Additionally, in embodiments, thepolarization control system may be configured to control a polarization of the second device light. In embodiments, the polarization control system may comprise a birefringentrotator (or Faraday rotator). Especially, in such embodiments, the birefringent rotator may beconfigured downstream of the first light generating device and upstream of the firstredirection optical element. In general, a birefringent rotator may 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 have a plane of polarization. In embodiments, through rotation of the birefringent rotator, and thus the rotation of the orientation of the plane of polarization relative to the optical axis of light incident on the birefringent rotator, the linear polarization of that light may be changed. As such, in embodiments, the birefringent rotator may beconfigured to receive the first device light emitted by the first light generating device andmay be configured to adjust (or control) the polarization of the first device light, such thatfirst device light having a predetermined (linear) polarization may be provided to the firstredirection optical element. Especially, in embodiments, the polarization control system may be configured to control rotation of the birefringent rotator, such that the polarization of thefirst device light reaching the first redirection optical element may be adjusted. Thebirefringent rotator may therefore, in embodiments, comprise a λ / 2 waveplate. Here, in embodiments, the wavelength λ may especially refer to a representative wavelength of theincoming beam of first device light, with which, upon rotation about the optical axis (of thebirefringent rotator), the polarization of the incoming (linear polarized) beam of first devicelight can be rotated by any angle. Hence, in embodiments, with a λ / 2 waveplate configured inan optical path between the first light generating device and the first redirection opticalelement, a linear polarized beam of first device light may be adjusted such that a beam of firstdevice light comprising any ratio of p / (s+p) and s / (s+p) may be provided to the firstredirection optical element. In such embodiments, p may refer to the p-polarized fraction and s may refer to the s-polarized fraction relative to a splitting (transmitting vs reflecting) planeof the first redirection optical element receiving the polarized first device light.Additionally or alternatively, in embodiments, the polarization control systemmay comprise a moving device, such as e.g. an actuator. In embodiments, the moving devicemay be configured to (mechanically) rotate the first light generating device. As such, inembodiments, the moving device may change the polarization of (a beam of) the first device 2023PF80437 31 light provided to the first redirection optical element. The polarization control system may, in embodiments, be configured to control the moving device. Especially, in embodiments, the polarization control system may be configured to control the moving device such that thepolarization of the first device light reaching the first redirection optical element may beadjusted. Yet additionally or alternatively, in embodiments, the polarization control system may comprise an adjustable fixating means (such as e.g. a screw or a clamp)configured such that the orientation of the first light generating device and the birefringentrotator relative to each other may be factory set. Furthermore, in some embodiments, the polarization control system may comprise both the birefringent rotator and the moving device. In such embodiments, the moving device may (also) be configured to control the birefringent rotator. However, in alternative such embodiments, the polarization control system may comprise a separate moving device (such as e.g. an actuator) for the birefringent rotator. Hence, in embodiments, the light generating system may comprise a polarization control system configured to controlthe polarization of (at least) the first device light (reaching the first redirection opticalelement), wherein the polarization control system may comprise one or more of: (A) abirefringent rotator configured downstream of the first light generating device and upstreamof the first redirection optical element, wherein the polarization control system may be configured to control rotation of the birefringent rotator (such that the polarization of the firstdevice light reaching the first redirection optical element may be adjusted); and wherein thebirefringent rotator may comprise a λ / 2 waveplate; and (B) a moving device configured to(mechanically) rotate the first light generating device, wherein the polarization controlsystem may be configured to control the moving device (such that the polarization of the firstdevice light reaching the first redirection optical element may be adjusted). Thus, the polarization control system may be configured to control apolarization of the first device light reaching the first redirection optical element. Especially,in embodiments, the polarization control system may be configured such that x1% of firstdevice light (e.g. the part comprising the first linear polarization) and y1% of first devicelight (e.g. the part comprising the second linear polarization) may be provided to the firstredirection optical element. Herein, in embodiments, x1 and y1 may be individually selected from the range of 0-100%, such as from the range of 10-90%, like from the range of 20-80%. In some embodiments, the polarization control system may be configured such that only first device light comprising the first linear polarization may be provided to the first redirection 2023PF80437 32 optical element, i.e., x1=100% and y1=0%. In other embodiments, the polarization controlsystem may be configured such that only first device light comprising the second linearpolarization may be provided to the first redirection optical element, i.e., y1=100% and x1=0%. In yet other embodiments, the polarization control system may be configured suchthat a combination of first device light comprising the first linear polarization and first devicelight comprising the second linear polarization may be provided to the first redirection optical element, i.e., x1≠0%, y1≠0%, and x1+y1=100%. For example, in embodiments, thepolarization control system may be configured such that x1=70% of first device lightcomprising the first linear polarization and y1=30% of first device light comprising thesecond linear polarization may be provided to the first redirection optical element, or viceversa (i.e., x1=30% and y1=70%). Hence, in embodiments, the polarization control systemmay be configured to provide an adjustable ratio of first device light having the first linear polarization to first device light having the second (orthogonal) linear polarization to the first redirection optical element. Hence, in embodiments, the polarization control system may be configured tocontrol a polarization of the first device light reaching the first redirection optical element.Especially, in embodiments, the polarization control system may be configured to control apolarization of the first device light reaching the first redirection optical element, such that atleast part of the first device light received by the first redirection optical element may bedirected in an optical path to the luminescent material and at least another part of the first device light received by the first redirection optical element may be directed in an opticalpath to the first diffuser assembly. For example, in embodiments, 50-100%, such as 60-98%,like 65-95% of the first device light received by the first redirection optical element may bedirected in an optical path to the luminescent material. Conversely, in embodiments, 0-50%,such as 2-40%, like 5-35% of the first device light received by the first redirection opticalelement may be directed in an optical path to the first diffuser assembly. In embodiments, an element, such as e.g. the luminescent element and the (first and / or second) diffuser, may be configured in either a reflective mode or a transmissive mode. Especially, in embodiments, one or more of the luminescent material, the first diffuser, and the second diffuser may be configured in the transmissive mode. In the transmissive mode, it may be relatively easy to have light source light admixed in the luminescent material light and / or the diffused device light, respectively, which may be useful for generating the desirable spectral power distribution. Hence, would 2023PF80437 33 any device light escape from the system, in embodiments, this may only escape via transmission through the luminescent material and / or the diffuser. Especially, in some embodiments, the first diffuser and the second diffusermay both be configured in the transmissive mode. A transmissive mode second diffuser maybe beneficial as no additional optical elements (such as waveplates) are necessary to separate the undiffused second device light from the diffused second device light. An additional benefit thereof may be that the polarization of the second device light reaching the diffuser system may be irrelevant for its function. Furthermore, in embodiments when the first and / or second diffuser may beconfigured in the transmissive mode, it may be desired to provide a safety mechanism, such that eye-safety may be ensured in case of failure (or decay) of one or more of the optical elements. For example, in embodiments, the safety mechanism may comprise a small-anglediffuse reflector configured to transmit undiffused (i.e. unsafe) device light (optionally to abeam dump) and to reflect diffused device light to the light exit optionally via one or more optics. However, alternative safety mechanisms may be possible as well, such as e.g. comprising one or more light sensors and / or a reflective polarizer. In the reflective mode, thermal management may be easier, as a substantial part of the luminescent material and / or the (first and / or second) diffuser may be in thermal contact with a thermally conductive element, like a heatsink or heat spreader. Hence, would any device light escape from the system, in embodiments, this may only escape via reflection at the luminescent material and / or the diffuser. Here below, some further embodiments of the luminescent material(s) are described. 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, theluminescent material(s) may be selected from silicates, especially doped with divalent europium. Especially, the luminescent material is configured to convert at least part of the light source light into luminescent material light, wherein the luminescent material maycomprise a (garnet)(first) luminescent material of the type A3B5O12:Ce, wherein A comprisesone 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, 2023PF80437 34 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%. Especially, a luminescent material comprises conversion material or is a conversion material. A luminescent material converts light from a light source, such as the light source light, into secondary light (here the luminescent material light). 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. Such groups (or molecule) may be indicated as converter element. The garnet type material as indicated above, comprises cerium (Ce) as converter element. Cerium comprising garnets are well known in the art. 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. Hence, especially suitable luminescent materials are cerium comprising garnet materials. Embodiments of garnets especially include A3B5O12garnets, wherein A comprises at least yttrium or lutetium and wherein B comprises at least aluminum. Such garnets may be doped with cerium (Ce), with praseodymium (Pr) or a combination of cerium and praseodymium; especially however with Ce. Especially, B comprises aluminum (Al), however, B may also partly comprise gallium (Ga) and / or scandium (Sc) and / or indium (In), especially up to about 20% of Al, more especially up to about 10 % of Al (i.e. the B ions essentially consist of 90 or more mole % of Al and 10 or less mole % of one or more of Ga, Sc, and In); B may especially comprise up to about 10% gallium. In another variant, B and O may at least partly be replaced by Si and N. The element A may especially be selected from the group consisting of yttrium (Y), gadolinium (Gd), terbium (Tb) and lutetium (Lu). Further, Gd and / or Tb are especially only present up to an amount of about 20% of A. In a specific embodiment, the garnet luminescent material comprises (Y1-xLux)3B5O12:Ce, wherein x is equal to or larger than 0 and equal to or smaller than 1. The term “:Ce”, indicates that part of the metal ions (i.e. in the garnets: part of the “A” ions) in the luminescent material is replaced by Ce. For instance, in the case of (Y1-xLux)3Al5O12:Ce, part of Y and / or Lu is replaced by Ce. This is known to the person skilled in the art. Ce will replace A in general for not more than 10%; in general, the Ce concentration will be in the range of 0.1 to 4%, 2023PF80437 35 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 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 2023PF80437 36 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, 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. In embodiments, the luminescent material may alternatively or additionally comprise one or more of MS:Eu2+and / or M2Si5N8:Eu2+and / or MAlSiN3:Eu2+and / or Ca2AlSi3O2N5:Eu2+, etc., wherein M comprises one or more of Ba, Sr and Ca, especially in embodiments at least Sr. Hence, in embodiments, the luminescent material may comprise one or more materials selected from the group consisting of (Ba,Sr,Ca)S:Eu, (Ba,Sr,Ca)AlSiN3:Eu and (Ba,Sr,Ca)2Si5N8:Eu. In these compounds, europium (Eu) is substantially or only divalent, and replaces one or more of the indicated divalent cations. In general, Eu will not be present in amounts larger than 10% of the cation; its presence will especially be in the range of about 0.5 to 10%, more especially in the range of about 0.5 to 5% relative to the cation(s) it replaces. The term “:Eu”, indicates that part of the metal ions is replaced by Eu (in these examples by Eu2+). For instance, assuming 2% Eu in CaAlSiN3:Eu, the correct formula could be (Ca0.98Eu0.02)AlSiN3. Divalent europium will in general replace divalent cations, such as the above divalent alkaline earth cations, especially Ca, Sr or Ba. 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.etc.. Instead of quantum dots or in addition to quantum dots, also other quantum confinement 2023PF80437 37 structures may be used. The term “quantum confinement structures” should, in the context of the present application, be understood as e.g. quantum wells, quantum dots, quantum rods,tripods, tetrapods, or nano-wires, etcetera. Organic phosphors can be used as well.Different luminescent materials may have different spectral power distributions of the respective luminescent material light. Alternatively or additionally, such different luminescent materials may especially have different color points (or dominant wavelengths). As indicated above, other luminescent materials may also be possible. Hence, in specific embodiments the luminescent material is 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 e.g. comprise quantum dots or quantum rods (or other quantum type particles) (seeabove). Quantum structures may also comprise quantum wells. Quantum structures may alsocomprise 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 other embodiments, the luminescent body may comprise a light transmissive body, wherein the luminescent material is embedded. For instance, the luminescent body may comprise a glass body, with luminescent material embedded therein. Or, the glass as such may be luminescent. In other embodiments, the luminescent body may comprise a polymeric body, with luminescent material embedded therein. Further, in embodiments, the luminescent material may be configured in thermal contact with a thermally conductive material. Especially, in embodiments where the luminescent material is configured in the reflective mode, such thermal contact may be beneficial as the luminescent material may give rise to significant thermal dissipation. Similarly, in some embodiments, the diffuser may be configured in thermal contact with a thermally conductive material. An element may be considered in “thermal contact” with another element if it can exchange energy through the process of heat. Hence, the elements may be thermally coupled. In embodiments, thermal contact can be achieved by physical contact. In embodiments, thermal contact may be achieved via a thermally conductive material, such as a thermally conductive glue (or thermally conductive adhesive). Thermal 2023PF80437 38 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 inother embodiments, the distance between the two elements may filled with a gas, liquid, ormay 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 yet further specific embodiments, a thermally conductive material may especially have a thermal conductivity of at least about 10 W / (m*K). In embodiments, the thermally conductive material may be comprised by and / or configured in thermal contact with one or more of a heatsink, a heat spreader, and a two- phase cooling device. Due to the Stokes shift and the non-ideal quantum efficiency, the luminescent material may give rise to quite a lot of thermal dissipation, in particular because the luminescent material may show photo saturation that reduces the quantum efficiency with increasing incident power density. Therefore, another solution for the thermal management of the luminescent material may be to, in embodiments, apply (or mount) the luminescent material onto a rotating element, such as e.g. a rotating (phosphor-)wheel (or disk) or a rotating rod (or cylinder). Such embodiments may enable thermal spreading and cooling without the need for e.g. active water cooling, and thereby enabling maximum possible irradiance values. Hence, in embodiments, the light generating system may comprise a rotating element. Especially, in such embodiments, the luminescent material may beconfigured onto the rotating element. Furthermore, in such embodiments, the rotatingelement may (also) comprise an additional track comprising an additional luminescent material (different from the first luminescent material). Such embodiments may be beneficial as the additional luminescent material may add further color point tunability along a line that may be substantially parallel or at least more parallel to the BBL in a targeted range of color 2023PF80437 39 temperatures. However, the skilled person will understand that, in such embodiments, further optical requirements may need to apply for the redirection optics. Further, in embodiments, the first and / or second diffuser may be staticdiffusers. Alternatively, in embodiments, the first and / or second diffusers may be dynamicdiffusers, such as e.g. a rotating wheel or a rotating rod, with a reflective diffuser track. Incontrast 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 first and / or second diffusersmay (also) be configured onto the rotating element.In some embodiments, the luminescent material, the first diffuser, and the second diffuser may each be configured on a separate rotating element. Alternatively, in embodiments, one or more of the luminescent material, the first diffuser, and the seconddiffuser may be configured on the (same) rotating element, such as e.g. combined as separaterings on a rotating wheel or a rotating rod. Hence, in embodiments, the light generating system may comprise a rotating element, wherein one or more of the luminescent material, the first diffuser, and the second diffuser are configured on the rotating element. In specific embodiments, the rotating element may comprise a phosphor wheel (or rod). Especially, in such embodiments, the phosphor wheel (or rod) may comprise a first track comprising the luminescent material. In such embodiments, the first track may have a(n average) first radius (R1) (defined relative to an axis of rotation AR of the rotating element). Additionally, in embodiments, the phosphor wheel (or rod) may comprise a second track comprising the first diffuser. In such embodiments, the second track may have a(n average) second radius (R2) (defined relative to the axis of rotation AR of the rotating element). Especially, in embodiments, R1≥R2, such as R1≥1.1*R2, like R1≥1.25*R2, especially R1≥1.5*R2. 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”). 2023PF80437 40 In embodiments, the optics may comprise one or more of integrating (or“homogenizing”) optics, collimating optics, condensing optics, and reflecting optics. Inspecific embodiments, the light generating system may comprise one or more of condensing and / or collimating optics (e.g. lenses), and integrating optics (e.g. homogenizers). Especially, in embodiments, condensing and / or collimating optics may be configured between the first redirection optical element and the luminescent material. Additionally or alternatively, in embodiments, condensing and / or collimating optics may be configured between the second redirection optical element and the first diffuser. Additionally or alternatively, in embodiments, condensing and / or collimating optics may be configured between the second redirection optical element and the second diffuser. Additionally or alternatively, in embodiments, condensing and / or collimating optics may be configured upstream of the light exit and downstream of the first redirection optical element. Furthermore, in embodiments, integrating optics may be configured between the first light generating device and the first redirection optical element. Additionally or alternatively, in embodiments, integrating optics may be configured between the second light generating device and the second redirection optical element. Additionally or alternatively, in embodiments, integrating optics may be configured upstream of the light exit and downstream of the first redirection optical element. For example, in embodiments, the luminescent material light and the diffused laser light may be provided (e.g. by the first redirection optical element) along the same optical path to the light exit, and the optics may comprise a beam homogenizer configured upstream of the light exit and configured to combine and homogenize the received light and to provide (homogenized white) system light to the light exit. As indicated above, in embodiments, the light generating system maycomprise laser banks. Typically, the use of “laser banks”, being relatively dense assembliesof 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) maybe convenient to project a beam of high power laser light onto a luminescent material withoutthe need for using an inverse beam expander. In specific embodiments, a laser bank maytherefore comprise an array of lenses (monolithic as multi-lens-array or as a set of discretelenses). In such embodiments, individual lenses of the array of lenses may correspond with (or act on the individual laser beams from) individual lasers in the laser bank. As beams of light emitted from such (multi-chip packages and / or) laser banks may comprise multiple narrow laser beams, each individual laser beam may represent a hot 2023PF80437 41 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. Therefore, in some 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, see also below. Similarly, in some 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 (first and second) diffuser) and collimating optics of the (first and second) diffuser, see also below. In embodiments, the homogenizing optics may e.g. comprise one or more of a transmissive volume diffuser, a transmissive surface diffuser, a reflective surface diffuser, a transmissive or reflective diffractive optical element, a transmissive holographic optical element, a single multi lens array, a double multi lens array such as a fly-eye lens array, or an integrating polygonal light pipe that may be either solid (with propagation in the integrator based on total internal reflection) or hollow (with propagation in the integrator based on specular reflection). In embodiments, the condensing optics may comprise a first condensing optics configured (directly) upstream of the luminescent material, a second condensing optics configured (directly) upstream of the first diffuser, and optionally a third condensing optics configured (directly) upstream of the second diffuser. Especially, in embodiments, the first condensing optics, the second condensing optics, and the optional third condensing optics may each comprise at least one positive lens. In specific embodiments (such as e.g. when the luminescent material is configured in the 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 (first or second) diffuser, respectively. Further, in embodiments, the optics may comprise a first collecting and collimating optics configured (directly) downstream of the luminescent material, a second collecting and collimating optics configured (directly) downstream of the first diffuser, and optionally a third collecting and collimating optics configured (directly) downstream of the second diffuser. Especially, in embodiments, the first collecting and collimating optics, the second collecting and collimating optics, and the optional third collecting and collimatingoptics may each comprise at least one positive lens, especially at least two positive lenses. In 2023PF80437 42 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 lattershows relatively low absorption and relatively low induced stress, but also has a relativelylow 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. It may be obvious that multiple other permutations of building blocks and subsystems as presented so far as well as further embodiments according to the principles of this invention may be covered. As indicated above, the light generating system comprises a light generating device. 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. In embodiments, the device light may essentially consist of the device light. In other embodiments, the device light may essentially consist of converted light source light. In yet other embodiments, the device light may comprise (unconverted) light source light and converted light source light. Light source light may be converted with a luminescent material into luminescent material light and / or with an upconverter into upconverted light (see also below). The term “light generating device” may also refer to a plurality of light generating devices which may provide device light having essentially the same spectral power distributions. In specific embodiments, the term “light generating device” may also refer to a plurality of light generating devices which may provide device light having different spectral power distributions. 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 generating system may comprise a light escape surface, such as an end window. 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 laserdiodes (or “diode lasers”)).Hence, the term LED may also refer to a plurality of LEDs. Inembodiments, the light source may comprise one or more micro-optical elements (array of micro lenses) downstream of a single solid-state light source, such as an LED, or downstream of a plurality of solid-state light sources (i.e. e.g. shared by multiple LEDs). In embodiments, the light source may comprise an LED with on-chip optics. In embodiments, the light source 2023PF80437 43 comprises pixelated single LEDs (with or without optics) (offering in embodiments on-chip beam steering). In embodiments, the light source may be configured to provide primary radiation, which is used as such, such as e.g. a blue light source, like a blue LED, or a green light source, such as a green LED, and a red light source, such as a red LED. Such LEDs, which may not comprise a luminescent material (“phosphor”) may be indicated as directcolor LEDs. In other embodiments, however, the light source may be configured to provideprimary radiation and part of the primary radiation is converted into secondary radiation. Secondary radiation may be based on conversion by a luminescent material. The secondary radiation may therefore also be indicated as luminescent material radiation. The term “light source” may (thus) refer to a light generating element as such, like e.g. a solid state light source, or e.g. to a package of the light generating element, such as a solid state light source, and one or more of a luminescent material comprising element and (other) optics, like a lens, a collimator. A light converter element (“converter element” or “converter”) may comprise a luminescent material comprising element. For instance, a solid state light source as such, like a blue LED, is a light source. A combination of a solid state light source (as light generating element) and a light converter element, such as a blue LED and a light converter element, optically coupled to the solid state light source, may also be a light source (but may also be indicated as light generating device). Hence, a white LED is a light source (but may e.g. also be indicated as (white) light generating device). The light source may especially be configured to generate light source light having an optical axis (O), (a beam shape,) and a spectral power distribution. The light source light may in embodiments comprise one or more bands, e.g. having band widths as known for lasers. The term “light source” herein may also refer to a light source comprising a solid state light source, such as an LED or a laser diode or a superluminescent diode. Hence, the term “light source” may also refer to a combination of a (diode) laser with a luminescent material configured to convert at least part of the (diode) laser radiation. In embodiments, the term “light source” may also refer to a combination of a light source, like an LED, and an optical filter, which may change the spectral power distribution of the light generated by the light source. Especially, the term “light generating device” may be used to address a light source and further (optical components), like an optical filter and / or a beam shaping element,etc. The phrases “different light sources” or “a plurality of different light sources”, andsimilar phrases, may in embodiments refer to a plurality of solid-state light sources selected 2023PF80437 44 from at least two different bins. Likewise, the phrases “identical light sources” or “a plurality of same light sources”, and similar phrases, may in embodiments refer to a plurality of solid- state light sources selected from the same bin. The term “solid state light source”, or “solid state material light source”, and similar terms, may especially refer to semiconductor light sources, such as a light emitting diode (LED), a diode laser, or a superluminescent diode. The term “laser light source” especially refers to a laser. Such laser may especially be configured to generate laser light source light having one or more wavelengths in the UV, visible, or infrared, especially having a wavelength selected from the spectral wavelength range of 200-2000 nm, such as 300-1500 nm. The term “laser” especially refers to a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. Especially, in embodiments the term “laser” may refer to a solid-state laser. In specific embodiments, the terms “laser” or “laser light source”, orsimilar terms, refer to a laser diode (or diode laser). Hence, in embodiments the light sourcecomprises a laser light source. In embodiments, the terms “laser” or “solid state laser” or “solid state material laser” may refer to one or more of a semiconductor laser diodes, such as GaN, InGaN, AlGaInP, AlGaAs, InGaAsP, lead salt, vertical cavity surface emitting laser (VCSEL), quantum cascade laser, hybrid silicon laser, etc. As can be derived from the below, the term “laser light source” may also refer to a plurality of (different or identical) laser light sources. In this way, a higher brightness may be obtained. In embodiments, laser light sources may be arranged in a laser bank (see also above). The laser bank may in embodiments comprise heat sinking and / or optics e.g. a lens to collimate the laser light. Hence, in embodiments lasers in a laser bank (or “laser array bank”) may share the same optics. The laser light source is 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. 2023PF80437 45 The laser light source light may in embodiments comprise one or more bands, having band widths as known for lasers. In specific embodiments, the band(s) may be relatively sharp line(s), such as having full width half maximum (FWHM) in the range of less than 20 nm at RT, such as equal to or less than 10 nm. Hence, the light source light has a spectral power distribution (intensity on an energy scale as function of the wavelength) which may comprise one or more (narrow) bands. The beams (of light source light) may be focused or collimated beams of (laser) light source light. The term “focused” may especially refer to converging to a small spot. This small spot may be at the discrete converter region, or (slightly) upstream thereof or (slightly) downstream thereof. Especially, focusing and / or collimation may be such that the cross-sectional shape (perpendicular to the optical axis) of the beam at the discrete converter region (at the side face) is essentially not larger than the cross-section shape (perpendicular tothe 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). 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. Instead of the term “solid state light source” also the term “semiconductor- based light source” may be applied. Hence, the term “semiconductor-based light source” may e.g. refer to one or more of a light emitting diode (LED), a laser diode, and a superluminescent diode. Hence, the light generating device may comprise one or more of a light emitting diode (LED), a laser diode, and a superluminescent diode. 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 2023PF80437 46 (corresponding to the energy of the photons) may be determined by the energy required for electrons to cross the band gap of the semiconductor. A laser diode (or diode laser) may be a semiconductor device substantially similar to a light-emitting diode in which a diode pumped directly with electrical current can create lasing conditions at the diode's junction. This is known to a person skilled in the art. Superluminescent diodes are known in the art. A superluminescent diode may be indicated as a semiconductor device which may be able to emit low-coherence light. Especially, superluminescent diodes may combine the high power and brightness of laser diodes with the low coherence of conventional light-emitting diodes. The low (temporal) coherence of the source has advantages that the speckle is significantly reduced or not visible, and the spectral distribution of emission is much broader compared to laser diodes, which can be better suited for lighting applications. Hence, in embodiments, the solid state light source may comprise a superluminescent diode. For instance, in further specific embodiments, the solid state light source may comprise a GaN-based superluminescent diode, or an InGaN-based superluminescent diode, or an AlGaN-based superluminescent diode. The light generating system may be part of or may be applied in e.g. office lighting systems, household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive applications, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, digital projection, or LCD backlighting. The light generating system (or luminaire) may be part of or may be applied in e.g. optical communication systems or disinfection systems. The 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 alsobe possible. The terms “light” and “radiation” are herein interchangeably used, unless clearfrom the context that the term “light” only refers to visible light. The terms “light” and 2023PF80437 47 “radiation” may thus refer to UV radiation, visible light, and IR radiation. In specific embodiments, especially for lighting applications, the terms “light” and “radiation” refer to (at least) visible light. The terms “blue light” or “blue emission” especially relates to light having a wavelength in the range of about 440-495 nm (including some violet and cyan hues). The terms “green light” or “green emission” especially relate to light having a wavelength in the range of about 495-570 nm. The terms “yellow light” or “yellow emission” especially relate to light having a wavelength in the range of about 570-590 nm. The phrase “light having one or more wavelengths in a wavelength range” and similar phrases may especially indicate that the indicated light (or radiation) has a spectral power distribution with at least intensity or intensities at these one or more wavelengths in the indicate wavelength range. For instance, a blue emitting solid state light source will have a spectral power distribution with intensities at one or more wavelengths in the 440-495 nm wavelength range. As described above, in embodiments, the light generating system may thus further comprise a control system. In embodiments, the control system may be configured to control the spectral power distribution of the system light by (individually) controlling the (first and second) light generating devices. Furthermore, in embodiments, the control system may be configured to control the correlated color temperature of the system light by (individually) controlling the light generating devices. In some embodiments, the control system (especially the polarization control system) may be configured to control the firstlight generating device, such that the first device light reaching the first redirection opticalelement may comprise linear polarized light. In specific embodiments, the control system may be configured to control one or more of the spectral power distribution and the radiantflux of the system light by controlling the polarization control system, such that in a firstoperational mode the system light may have a first correlated color temperature (CCT1). Additionally or alternatively, in embodiments, the control system may be configured to control one or more of the spectral power distribution and the radiant flux of the system light by controlling the polarization control system, such that in a second operational mode the system light may have a second correlated color temperature (CCT2). Especially, in embodiment, the control system may be configured to control the polarization control system (which may in turn control the polarization of first device light reaching the first redirection optical element), 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≥200 K, like CCT2-CCT1≥400 K, like at least 500 K, such as CCT2-CCT1≥600 K,especially CCT2-CCT1≥800 K. Especially, in embodiments, CCT2-CCT1≥1000 K, more 2023PF80437 48 especially CCT2-CCT1≥1500 K. Further, in embodiments, CCT2-CCT1 may be at most 5000K, such as at most 3000K, like at most 2500K. The term “controlling” and similar terms especially refer at least to determining the behavior or supervising the running of an element. Hence, herein “controlling” and similar terms may e.g. refer to imposing behavior to the element (determining the behavior or supervising the running of an element), etc., such as e.g. measuring, displaying, actuating, opening, shifting, changing temperature, etc.. Beyond that, the term “controlling” and similar terms may additionally include monitoring. Hence, the term “controlling” and similar terms may include imposing behavior on an element and also imposing behavior on an element and monitoring the element. The controlling of the element can be done with a control system, which may also be indicated as “controller”. The control system and the element may thus at least temporarily, or permanently, functionally be coupled. The element may comprise the control system. In embodiments, the control system and element may not be physically coupled. Control can be done via wired and / or wireless control. The term “control system” may also refer to a plurality of different control systems, which especially are functionally coupled, and of which e.g. one control system may be a master control system and one or more others may be slave control systems. A control system may comprise or may be functionally coupled to a user interface. The control system may 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. Hence, in embodiments the control system may (also) be configured to be controlled by an App on a remote device. In such embodiments the control system of the lighting system may be a slave control system or control in a slave mode. For instance, the lighting system may be identifiable with a code, especially a unique code for the respective lighting system. The control system of the lighting system may be configured to be controlled by an external control system which has access to the lighting system on the basis of knowledge (input by a user interface of with an optical sensor (e.g. QR code reader) of the (unique) code. The lighting system may also comprise means for communicating with other systems or devices, such as on the basis of Bluetooth, Thread, WIFI, LiFi, ZigBee, BLE or WiMAX, or another wireless technology. 2023PF80437 49 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 (polarization) 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. In yet a further aspect, the invention also provides a lamp or a luminaire comprising the light generating system as defined herein. The luminaire may further comprise a housing, optical elements, louvres, etc. etc... The lamp or luminaire may further comprise a housing enclosing the light generating system. The lamp or luminaire may comprise a light window in the housing or a housing opening, through which the system light may escape from the housing. In yet a further aspect, the invention also provides a projection device comprising the light generating system as defined herein. Especially, a projection device or “projector” or “image projector” may be an optical device that projects an image (or moving images) onto a surface, such as e.g. a projection screen. The projection 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. For instance, in embodiments the lighting device may comprise a housing or a carrier, configured to house or support one or more of the light generating devices, the luminescent element, the diffuser system, the control system, 2023PF80437 50 the polarization control system, and the optics. In embodiments, the invention may thus comprise an optical wireless communication device comprising the light generating system. In such embodiments, one or more of the first light generating device, the second lightgenerating device, and the third light generating device may especially comprise a highfrequency laser and / or may be amplitude modulated. In specific embodiments, especially thethird light generating device may comprise a high frequency laser and / or may be amplitudemodulated. Such embodiments may be beneficial as in such embodiments the light generating device providing the fraction of (blue laser) diffused device light to the reflective diffuser is modulated, which is generally faster in their temporal response (i.e., in their decay rate) than luminescent material. 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. 1-4 schematically depict some embodiments of the light generatingsystem. Fig. 5 schematically depicts some applications of the light generating systemin lighting devices. The schematic drawings are not necessarily to scale. DETAILED DESCRIPTION OF THE EMBODIMENTS Fig.1 schematically depicts a light generating system 1000 comprising a first light generating device 110, a second light generating device 120, a luminescent material 200, a control system 300, redirection optics 505, a polarization control system 600, a first diffuser assembly 1710, a second diffuser assembly 1720, and a light exit 1090. In 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 440-490 nm. Therefore, the first light generating device 110 may comprise a first solid state light source 10. Especially, in embodiments, the first light generating device 110 may comprise a first laser bank comprising a plurality of first lasers. In embodiments, the first device light 111 reaching the redirection optics 505 may comprise linear polarized light. For example, in embodiments, the first device light 111 reaching the redirection optics 505 may comprise a first portion of first device light 111a (e.g. p-polarized 2023PF80437 51light as depicted in the figures with a small perpendicular arrow on the arrow indicating thepropagation of 111a) and a second portion of first device light 111b (e.g. s-polarized light as depicted in the figures with a dot on the arrow indicating the propagation of 111b). Conversely, in embodiments, the second light generating device 120 may be configured to provide second device light 121 having a second centroid wavelength (λc2) selected from the wavelength range of 600-780 nm. Therefore, the second light generating device 120 may comprise a second solid state light source 20. Especially, in embodiments, the second light generating device 120 may comprise a second laser bank comprising a plurality of second lasers. In embodiments, the second device light 121 reaching the redirection optics 505 may comprise polarized light. Especially, in embodiments such as depicted in Figs.1, the second device light 121 reaching the redirection optics 505 may comprise (substantially) linear polarized light. However, as depicted in Figs.2-4, this may not necessarily be the case, i.e., in some embodiments the second device light 121 reaching the redirection optics 505 may have essentially any polarization, including zero net. polarization (i.e. unpolarized light). Further, in embodiments, the luminescent material 200 may be configured (inan operational mode of the light generating system 1000) downstream of the first light generating device 110. Especially, in embodiments, the luminescent material 200 may be configured to convert at least part of first device light 111 received by the luminescent material 200 into luminescent material light 201. The luminescent material 200 may especially receive the first device light 111 via optics, such as via at least a first redirectionoptical element 515 of the redirection optics 505 (see also above and further below). Further,in embodiments, the luminescent material light 201 may have a third centroid wavelength (λc3) selected from the wavelength range of (λc1+10 nm) ≤ λc3≤ (λc2-10 nm). Especially, the third centroid wavelength (λc3) may be selected from the wavelength range of 490-620 nm. Similarly, in embodiments, the first diffuser assembly 1710 may be configured (in an operational mode of the light generating system 1000) downstream of the first lightgenerating device 110. The first diffuser assembly 1710 may, as depicted here, comprise a(narrangement of a) polarization converter 730 (such as e.g. a quarter waveplate for at least(blue) light having the first centroid wavelength λc1) and a first diffuser 710. In embodiments,the first diffuser assembly 1710 may be configured to diffuse at least part of first device light 111 received by the first diffuser assembly 1710 into first diffused device light 711. Especially, in embodiments, the first diffused device light 711 generated by the first diffuser 2023PF80437 52assembly 1710 may have the first centroid wavelength (λc1) and may comprise a linearpolarization different from a polarization of the first device light 111. Conversely, in embodiments, the second diffuser assembly 1720 may be configured (in an operational mode of the light generating system 1000) downstream of thesecond light generating device 120. The second diffuser assembly 1720 may, as depictedhere, comprise at least a second diffuser 720. In some embodiments, as depicted in Figs. 1,the second diffuser assembly 1720 may comprise a(n arrangement of a) polarizationconverter 730 (such as e.g. a quarter waveplate for at least (red) light having the secondcentroid wavelength λc2) and the second diffuser 720. However, in alternative embodiments,such as depicted in Figs. 2-4, the second diffuser assembly 1720 may comprise a transmissivediffuser. In embodiments, the second diffuser assembly 1720 may be configured to diffuse at least part of second device light 121 received by the second diffuser assembly 1720 into second diffused device light 721. Especially, in embodiments such as depicted in Figs.1A and 1B, the second diffused device light 721 may have a linear polarization (e.g. ppolarization (see e.g. Fig. 1B) or s polarization (see e.g. Fig. 1A)) different from the linearpolarization of the second device light 121 (e.g. s polarization (see e.g. Fig.1B) or ppolarization (see e.g. Fig. 1A) received by the second diffuser assembly 1720.As indicated above, in embodiments, the redirection optics 505 may comprise a first redirection optical element 515 and a second redirection optical element 525. The first redirection optical element 515 may, in embodiments, be configuredin an optical path between at least the first light generating device 110 and the luminescentmaterial 200, and in an optical path between at least the first light generating device 110 and the first diffuser assembly 1710. Especially, in embodiments, the first redirection optical element 515 may be configured to (i) reflect the luminescent material light 201 (received by the first redirection optical element 515) in an optical path to the light exit 1090, (ii) transmit the second diffused device light 721 (received by the first redirection optical element 515) in an optical path to the light exit 1090, and (iii) reflect or transmit light (received by the first redirection optical element 515) having the first centroid wavelength (λc1) in dependence of its linear polarization. Such embodiments are e.g. depicted in Figs.1A, 2A, and 3A. Alternatively, in embodiments, the first redirection optical element 515 maybe configured to (i) transmit the luminescent material light 201 (received by the firstredirection optical element 515) in an optical path to the light exit 1090, (ii) reflect the second diffused device light 721 (received by the first redirection optical element 515) in an optical path to the light exit 1090, and (iii) reflect or transmit light (received by the first 2023PF80437 53 redirection optical element 515) having the first centroid wavelength (λc1) in dependence ofits linear polarization. Such embodiments are e.g. depicted in Figs. 1B, 2B, 3B, and 4.Furthermore, in embodiments, the first redirection optical element 515 may be configured to direct a part of the first device light 111 (111a or 111b) (received by the first redirection optical element 515) having a first linear polarization in an optical path to the luminescent material 200 and to direct another part of the first device light 111 (111b or 111a) (received by the first redirection optical element 515) having a second linear polarization (different from the first linear polarization) in an optical path to the first diffuser assembly 1710. In embodiments, such as depicted in Figs.1B, 2B, 3B, and 4, the first redirection optical element 515 may comprise a combination of (i) a polarizing beam splitter for light having a wavelength selected from the wavelength range of 440-490 nm, and (ii) a low-pass filter configured to transmit light having a wavelength below a cut-off wavelength (λlp) (i.e. a substantial part of the spectral power of the luminescent material light 201) and toreflect light having a wavelength above the cut-off wavelength (λlp) (i.e. the second diffuseddevice light 721). Especially, in embodiments, the first redirection optical element 515 maycomprise a combination of (i) a polarizing beam splitter for light having a wavelength selected from the wavelength range of 440-490 nm, and (ii) a low-pass filter having a cut-off wavelength (λlp) selected from the range of λc3≤λlp≤λc2. Alternatively, in embodiments, the first redirection optical element 515 may comprise a combination of (i) a polarizing beam splitter for light having a wavelength selected from the wavelength range of 440-490 nm, and (ii) a band reflection filter having a first cut-off wavelength (λbr1) and a second cut-off wavelength (λbr2). In such embodiments, the first cut-off wavelength (λbr1) may be selected from the range of λc3≤λlp≤λc2, whereas the second cut-off wavelength may be selected from the range of >λc2. Hence, as depicted in Figs.1B, 2B, 3B, and 4, the first redirection optical element 515 may be configured to (i) (re-)direct (blue) first (diffused) device light 111(,711)in dependence of its polarization, to (ii) reflect (red) second diffused device light 721, and(iii) to substantially transmit the luminescent material light 201. In alternative embodiments, such as depicted in Figs.1A, 2A, and 3A, the first redirection optical element 515 may comprise a combination of (i) a polarizing beam splitter for light having a wavelength selected from the wavelength range of 440-490 nm, and (ii) a band reflection filter having a first cut-off wavelength (λbr1) and a second cut-off wavelength (λbr2), wherein the first cut-off wavelength (λbr1) may be selected from the range of λc1≤λlp≤λc3, and wherein the second cut-off wavelength may be selected from the range of 2023PF80437 54 λc3≤λlp≤λc2. Furthermore, in such embodiments, the first redirection optical element 515 may also comprise a further low-pass filter having a cut-off wavelength (λlp) selected from the range of >λc2. Hence, as depicted in Figs.1A, 2A, and 3A, the first redirection optical element 515 may be configured to (i) (re-)direct (blue) first (diffused) device light 111(,711)in dependence of its polarization, to (ii) transmit (red) second diffused device light 721, and(iii) to substantially reflect the luminescent material light 201. The second redirection optical element 525 may, in embodiments, be configured in an optical path between at least the second light generating device 120 and thesecond diffuser assembly 1720. Especially, in embodiments, the second redirection opticalelement 525 may be configured to (i) reflect light (received by the second redirection optical element 525) having the first centroid wavelength (λc1), (ii) transmit the second diffused device light 721 (received by the second redirection optical element 525) in an optical path to the first redirection optical element 515, and optionally (iii) reflect the second device light 121 (received by the second redirection optical element 525) in an optical path to the second diffuser assembly 1720. Alternatively, in embodiments, the second redirection optical element 525 may be configured to (i) transmit light (received by the second redirection optical element 525) having the first centroid wavelength (λc1), (ii) reflect the second diffused device light 721 (received by the second redirection optical element 525) in an optical path to the first redirection optical element 515, and optionally (iii) transmit the second device light 121 (received by the second redirection optical element 525) in an optical path to the second diffuser assembly 1720. Further, in embodiments, the polarization control system 600 may be configured to control the polarization of the first device light 111 reaching the first redirection optical element 515. In embodiments, as depicted here, the polarization control system 600 may comprise a birefringent rotator 610 configured downstream of the first light generating device 110 and upstream of the first redirection optical element 515. Especially, in embodiments, the polarization control system 600 may be configured to control rotation of the birefringent rotator 610. The birefringent rotator 610 may, e.g., comprise a λ / 2 waveplate. Additionally or alternatively, in embodiments, the polarization control system 600 maycomprise a moving device 620 configured to rotate the first light generating device 110.Especially, in embodiments, the polarization control system 600 may be configured to controlthe moving device 620. As such, the polarization control system may be configured toprovide an adjustable ratio of first device light 111 having the first linear polarization (and 2023PF80437 55 thus propagating to the luminescent material 200 and / or the first diffuser assembly 1710) to first device light 111 having the second linear polarization (and thus propagating to the first diffuser assembly 1710 and / or the luminescent material 200) to the first redirection optical element 515. Furthermore, in embodiments, the control system 300 may be configured to control the one or more elements of the light generating system 1000, such as e.g. the polarization control system 300. Especially, in embodiments, the control system 300 may be configured to control one or more of a spectral power distribution, a correlated color temperature, a color gamut, and a color rendering index of the system light 1001. In embodiments, the light generating system 1000 may be configured togenerate in a first operational mode of the light generating system 1000 white system light1001. The white system light 1001, may especially comprise (one or more of) at least part ofthe luminescent material light 201, at least part of the first diffused device light 711, and at least part of the second diffused device light 721. In specific embodiments, in the first operational mode of the light generating system 1000 the first light generating device 110 may be operated at a constant (first) drive current and the second light generating device 120 may be operated at an adjustable (second) drive current. Furthermore, in embodiments, the light generating system 1000 may comprise one or more of condensing and / or collimating optics 560, and integrating optics 570. In embodiments, condensing and / or collimating optics 560 may be configured between the first redirection optical element 515 and the luminescent material 200. Additionally or alternatively, in embodiments, condensing and / or collimating optics 560 may be configured between the second redirection optical element 525 and the first diffuser 710. Additionally or alternatively, in embodiments, condensing and / or collimating optics 560 may be configured between the second redirection optical element 525 and the second diffuser 720. Additionally or alternatively, in embodiments, condensing and / or collimating optics 560 may be configured upstream of the light exit 1090 and downstream of the first redirection optical element 515. Conversely, in embodiments, integrating optics 570 may be configured between the first light generating device 110 and the first redirection optical element 515. Additionally or alternatively, in embodiments, integrating optics 570 may be configured between the second light generating device 120 and the second redirection optical element 525. Additionally or alternatively, in embodiments, integrating optics 570 may be configured upstream of the light exit 1090 and downstream of the first redirection optical element 515. 2023PF80437 56 Herein, reference 1250 may especially refer to a rotating element, see also further below. As depicted in Figs.1, in embodiments, (one or more of) the luminescent material 200, the first diffuser assembly 1710, and the second diffuser assembly 1720 may (each) be configured in a reflective mode. In embodiments where one or both of the diffuser assemblies 1710,1720 are configured in a reflective mode, said diffuser assemblies may especially comprise polarization maintaining reflective diffusers. For Fig.1A, the working principle may be indicated as follows: (i) a first lightgenerating device 110 is configured to emit (blue) first device light 111 and a second lightgenerating device 120 is configured to emit (red) second device light 121, wherein both lightgenerating devices 110,120 may provide device light 111,121 comprising linear polarizedlight; (ii) the polarization of the (blue) first device light 111 can be adjusted via thebirefringent rotator 610 (or optionally via rotation of the light generating device 100); the s-polarized part may be reflected by the first redirection optical element 515 (i.e. beam splitter)towards the first diffuser assembly 1710 (via the second redirection optical element 525),while the p-polarized part may be transmitted to the luminescent material 200; (iii) thereflected first diffused device light 711 may be (substantially) transmitted by the firstredirection optical element 515 thanks to the polarization rotation imposed by thepolarization converter 730 (especially a λ / 4 plate for at least blue light); (iv) the (red) seconddevice light 121 may be transmitted by the second redirection optical element 525 towardsthe second diffuser assembly 1720, after which the reflected second diffused device light 721may be (substantially) reflected by the second redirection optical element 525 thanks to thepolarization rotation imposed by the polarization converter 730 (especially a λ / 4 plate for atleast red light) and may as such be combined with the first diffused (blue) device light 711;(v) the first redirection optical element 515 may combine the luminescent (yellow) materiallight 201, the first diffused (blue) device light 711 and the second diffused (red) device light721 into mixed white output system light 1001.Alternatively, as depicted in Fig. 1B, the first redirection optical element 515may be transmissive for (yellow) luminescent material light 201, and the second redirectionoptical element may be reflective for (blue) first diffused device light 711, and transmissivefor (red) second diffused device light 721. In such embodiments, as depicted here, the secondredirection optical element 525 may effectively be reflective for (blue) device light 101,111 having the first centroid wavelength (λc1) and act as a polarizing beam splitter for (red) 2023PF80437 57 device light 101,121 having the second centroid wavelength (λc2). Further working principles may be similar to the ones above described for Fig.1A. Furthermore, in embodiments, (one or more of) the luminescent material 200,the first diffuser 710 and the second diffuser 720 may be configured in the transmissivemode. For example, as depicted in Fig. 2A, the second diffuser 720 may be configured in thetransmissive mode. Typically (as depicted here), in embodiments, only the light from thelight generating device 100 (especially laser bank) that provides the lowest optical power isdiffused by a transmissive component. In embodiments, as depicted in Fig.2A, where the second diffuser 720 is configured in the transmissive mode, (i) the second diffuser arrangement 1720 does not require a polarization converter 730, and (ii) the secondredirection optical element 525 may comprise a (simple) dichroic beam splitter. Hence, insuch embodiments, the second redirection optical element 525 may be configured (i) to transmit light (especially second diffused device light 721) having the second centroid wavelength (λc2) and (ii) to reflect light (especially first (diffused) device light 111(,711)) having the first centroid wavelength (λc1) as depicted here in Fig.2A. Further, in such embodiments, the first redirection optical element 515 may effectively (i) be transmissive for (red) second diffused device light 721 having the second centroid wavelength (λc2), (ii) be reflective for luminescent material light 201, and (iii) act as a polarizing beam splitter for(blue) first (diffused) device light 101,111(,711) having the first centroid wavelength (λc1).Alternatively, the second redirection optical element 525 may be configured (i) to reflect light (especially second diffused device light 721) having the second centroid wavelength (λc2) and (ii) to transmit light (especially first (diffused) device light 111(,711)) having the first centroid wavelength (λc1) as depicted in Fig.2B. Furthermore, as depicted in Fig.2B, the first redirection optical element 515 may effectively (i) be reflective for (red) second diffused device light 721 having the second centroid wavelength (λc2), (ii) be transmissive for luminescent material light 201, and (iii) act as a polarizing beam splitter for (blue) first (diffused) device light 101,111(,711) having the first centroid wavelength (λc1). Figs.3 further schematically depict light generating systems 1000, where the first diffuser 710 and the second diffuser 720 may both be configured in the transmissive mode. Here, in embodiments, the first diffuser 710 may comprise a small angle transmissive diffuser. Further, in embodiments, the first diffuser assembly 1710 may further comprise areflector 740 configured downstream of the first diffuser 710. In embodiments, the reflector740 may comprise a specular reflector. 2023PF80437 58 Especially, as depicted in Fig. 3A, in embodiments, not only the (red) devicelight 121 may be diffused by a transmissive (second) diffuser 720, but also the (blue) devicelight 111 that will contribute as blue light to the light engine (white) system light 1001 maybe diffused by a transmissive (first) diffuser 710. Hence, here in embodiments, the reflectivediffuser 710 (and its respective condenser optics 560 as were depicted in Figs. 1-2) may beexchanged for a reflector 740 combined with a small angle transmissive diffuser 710configured between the second redirection optical element 525 and the reflector 740. Here, asdepicted, the first redirection optical element 515 may be configured to (i) reflect luminescentmaterial light 201 to the light exit 1090, (ii) transmit second diffused device light 721 to thelight exit 1090, (iii) transmit first device light 111a (having the first linear polarization) to theluminescent material, (iv) reflect first device light 111b (having the second linearpolarization) to the first diffuser assembly 1710 via the second redirection optical element525, and (v) transmit first diffused device light 711 to the light exit 1090. On the other hand, the second redirection optical element 525 may be configured to (i) reflect first device light111b (having the second linear polarization) to the first diffuser assembly 1710, (ii) reflectfirst diffused device light 711 (having the first linear polarization) to the light exit 1090 viathe first redirection optical element 515, and (iii) transmit second diffused device light 721 tothe light exit 1090 via the first redirection optical element 515. Fig.3B also depicts embodiments comprising a transmissive first diffuser 710 combined with a transmissive second diffuser 720. However, as depicted here, in embodiments, the first redirection optical element 515 may be configured to (i) transmitluminescent material light 201 to the light exit 1090, (ii) reflect second diffused device light721 to the light exit 1090, (iii) transmit first device light 111a (having the first linear polarization) to the first diffuser assembly 1710 via the second redirection optical element525, (iv) reflect first device light 111b (having the second linear polarization) to theluminescent material 200, and (v) reflect first diffused device light 711 to the light exit 1090.On the other hand, the second redirection optical element 525 may be configured to (i)transmit first device light 111a (having the first linear polarization) to the first diffuserassembly 1710, (ii) transmit first diffused device light 711 (having the second linearpolarization) to the light exit 1090 via the first redirection optical element 515, and (iii)reflect second diffused device light 721 to the light exit 1090 via the first redirection opticalelement 515. Further embodiments using different combinations of transmissive or reflective diffusers and luminescent materials may be clear to the skilled person. 2023PF80437 59 Further, in embodiments, the luminescent material 200 may be configured in thermal contact with a thermally conductive material. Especially, in embodiments as depicted in Fig. 4, the light generating system1000 may comprise a rotating element 1250. Moreover, in embodiments, one or more of the luminescent material 200, the first diffuser 710, and the second diffuser 720 may be configured on the rotating element 1250. For example, as depicted here, the luminescent material 200 and the first diffuser 710 may be configured on (or even embedded in) the rotating element 1250. The rotating element 1250 may for example comprises one of a phosphor wheel, a phosphor disk, or a rotating rod. Especially, the rotating element 1250 may comprise a phosphor wheel comprising (i) a first track comprising the luminescent material 200 and (ii) a second track comprising the first diffuser 710. Further, in embodiments, the first track may have a(n average) first radius (R1) (defined relative to an axis of rotation AR of the rotating element 1250) and the second track may have a(n average) second radius (R2) (defined relative to the axis of rotation ARof the rotating element 1250). In further embodiments, R1≥R2. Fig. 5 schematically depicts an embodiment of a luminaire 2 comprising thelight generating system 1000 as described above. Reference 301 indicates a user interface which may be functionally coupled with the control system 300 comprised by or functionally coupled to the light generating system 1000. Fig.5 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, whichmay also comprise the light generating system 1000. Hence, Fig. 5 schematically depictsembodiments 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, an automotive headlight, 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 inspecific embodiments thus be system light 1001. Reference 1300 refers to a space, such as aroom. Reference 1305 refers to a floor and reference 1310 to a ceiling; reference 1307 refersto 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. 2023PF80437 60The terms “substantially” or “essentially” may also include embodiments with “entirely”,“completely”, “all”, etc. Hence, in embodiments the adjective substantially or essentially may also be removed. Where applicable, the term “substantially” or the term “essentially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%. The term “comprise” also includes embodiments wherein the term “comprises” means “consists of”. The term “and / or” especially relates to one or more of the items mentioned before and after “and / or”. For instance, a phrase “item 1 and / or item 2” and similar phrases may relate to one or more of item 1 and item 2. The term "comprising" may in an embodiment refer to "consisting of" but may in another embodiment also refer to "containing at least the defined species andoptionally one or more other species". Use of the verb "to comprise" and its conjugationsdoes not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein. The devices, apparatus, or systems may herein amongst others be describedduring operation. As will be clear to the person skilled in the art, the invention is not limitedto methods of operation, or devices, apparatus, or systems in operation.It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The invention may be implemented by means of hardware comprising severaldistinct elements, and by means of a suitably programmed computer. In a device claim, or anapparatus claim, or a system claim, enumerating several means, several of these means may 2023PF80437 61 be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of thesemeasures cannot be used to advantage. In yet a further aspect, the invention (thus) provides asoftware product, which, when running on a computer is capable of bringing about (one or more embodiments of) the method as described herein. The invention also provides a control system that may control the device, apparatus, or system, or that may execute the herein described method or process. Yet further, the invention also provides a computer program product, when running on a computer which is functionally coupled to or comprised by the device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system. The invention further applies to a device, apparatus, or system comprising oneor more of the characterizing features described in the description and / or shown in the attached drawings. The invention further pertains to a method or process comprising one or more of the characterizing features described in the description and / or shown in the attached drawings. The various aspects discussed in this patent can be combined in order toprovide additional advantages. Further, the person skilled in the art will understand thatembodiments can be combined, and that also more than two embodiments can be combined. Furthermore, some of the features can form the basis for one or more divisional applications.

Claims

2023PF80437 62 CLAIMS:

1. A light generating system (1000) comprising a first light generating device(110), a second light generating device (120), a luminescent material (200), a control system (300), redirection optics (505), a polarization control system (600), a first diffuser assembly(1710), a second diffuser assembly (1720), and a light exit (1090); wherein:- 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 440-490 nm, wherein the first light generating device (110) comprises a first solid state light source (10); wherein the first device light (111) reaching the redirection optics (505) comprises linear polarized light;- the second light generating device (120) is configured to provide seconddevice light (121) having a second centroid wavelengthselected from the wavelength range of 600-780 nm, wherein the second light generating device (120) comprises a second solid state light source (20);- the solid state light sources (10,20) are individually selected from the groupcomprising laser diodes, superluminescent diodes, and stacked multi-junction light-emitting diodes;- the luminescent material (200) is configured to convert at least part of firstdevice light (111) received by the luminescent material (200) into luminescent material light (201);- the first diffuser assembly (1710) comprises a polarization converter (730) anda first reflective diffuser (710); wherein the first diffuser assembly (1710) is configured todiffuse at least part of first device light (111) received by the first diffuser assembly (1710) into first diffused device light (711) having the first centroid wavelength (λc1) and comprisinga linear polarization different from a linear polarization of the first device light (111) receivedby the first diffuser assembly (1710);- the second diffuser assembly (1720) comprises at least a second reflectivediffuser (720); wherein the second diffuser assembly (1720) is configured to diffuse at least part of second device light (121) received by the second diffuser assembly (1720) into second diffused device light (721);2023PF80437 63- the redirection optics (505) comprise a first redirection optical element (515)and a second redirection optical element (525); -the first redirection optical element (515) is configured (a) to (i) reflect theluminescent material light (201) in an optical path to the light exit (1090), (ii) transmit the second diffused device light (721) in an optical path to the light exit (1090), and (iii) reflect or transmit light having the first centroid wavelength (λc1) in dependence of its linearpolarization, or (b) to transmit the luminescent material light (201) in an optical path to thelight exit (1090), (ii) reflect the second diffused device light (721) in an optical path to the light exit (1090), and (iii) reflect or transmit light having the first centroid wavelength (λc1) in dependence of its linear polarization; wherein the first redirection optical element (515) is configured to direct a part of the first device light (111) having a first linear polarization in an optical path to the luminescent material (200) and to direct another part of the first devicelight (111) having a second linear polarization in an optical path to the first diffuser assembly(1710); -the second redirection optical element (525) is configured (a) to (i) reflectlight having the first centroid wavelength (λc1), (ii) transmit the second diffused device light (721) in an optical path to the first redirection optical element (515), and (iii) reflect thesecond device light (121) in an optical path to the second diffuser assembly (1720) or (b) to(i) transmit light having the first centroid wavelength (λc1), (ii) reflect the second diffused device light (721) in an optical path to the first redirection optical element (515), and (iii) transmit the second device light (121) in an optical path to the second diffuser assembly (1720);- the polarization control system (600) is configured to control the polarizationof the first device light (111) reaching the first redirection optical element (515);- the light generating system (1000) is configured to generate in a firstoperational mode of the light generating system (1000) white system light (1001) comprising at least part of the luminescent material light (201), at least part of the first diffused devicelight (711), and at least part of the second diffused device light (721); and- the control system (300) is configured to control one or more of a spectralpower distribution, a correlated color temperature, a color gamut, and a color rendering index of the system light (1001).

2. The light generating system (1000) according to claim 1, wherein the secondcentroid wavelength (λc2) is selected from the wavelength range of 620-750 nm.2023PF80437 643. The light generating system (1000) according to any one of the precedingclaims, wherein the second device light (121) reaching the redirection optics (505) comprises linear polarized light; wherein one or more of the first diffuser (710) and the second diffuser (720) comprise a polarization maintaining diffuser; wherein the luminescent material light (201) has a third centroid wavelength (λc3) selected from the wavelength range of (λc1+10 nm) ≤ λc3≤ (λc2-10 nm), and wherein the third centroid wavelength (λc3) is selected from the wavelength range of 490-620 nm.

4. The light generating system according to any one of the preceding claims,wherein (a) in the first operational mode of the light generating system (1000) the first light generating device (110) is operated at a constant drive current and the second light generating device (120) is operated at an adjustable drive current, or (b) in the first operational mode of the light generating system (1000) the first light generating device (110) is configured to operate at its rated forward current, its rated peak forward current, or a current in between these two.

5. The light generating system (1000) according to any one of the precedingclaims, wherein the second redirection optical element (525) is configured: (A) to (i) reflectfirst device light (111) received by the second redirection optical element (525) in an optical path to the first diffuser assembly (1710) and reflect first diffused device light (711) received by the second redirection optical element (525) in an optical path to the first redirection optical element (515), (ii) transmit the second diffused device light (721) to the first redirection optical element (515), and optionally (iii) reflect the second device light (121) to the second diffuser assembly (1720), or (B) to (i) transmit first device light (111) received by the second redirection optical element (525) in an optical path to the first diffuser assembly (1710) and transmit first diffused device light (711) received by the second redirection optical element (525) in an optical path to the first redirection optical element (515), (ii) reflect the second diffused device light (721) to the first redirection optical element (515), and optionally (iii) transmit the second device light (121) to the second diffuser assembly (1720).

6. The light generating system (1000) according to any one of the precedingclaims, wherein the luminescent material is of the type A3B5O12:Ce, wherein A comprises2023PF80437 65 one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc.

7. The light generating system (1000) according to any one of the precedingclaims, wherein the second redirection optical element (525) is selected from the groupcomprising: a plate polarizing beam splitter, a cube polarizing beam splitter, and a thin filmpolarizing beam splitter.

8. The light generating system (1000) according to any one of the precedingclaims 3 - 7, wherein the first redirection optical element (515) comprises a combination of apolarizing beam splitter for light having a wavelength selected from the wavelength range of440-490 nm, and one of: (a) a low-pass filter having a cut-off wavelength (λlp) selected fromthe range of (b) a band reflection filter having a first cut-off wavelength (λbr1) selected from the range of λc3≤λbr1≤λc2 and a second cut-off wavelength (λbr2) selected fromthe range of >λc2; and (c) a band reflection filter having a first cut-off wavelength (λbr1)selected from the range of λc1<λbr1≤λc3 and a second cut-off wavelength (λbr2) selected from the range of λc3≤λbr2≤λc2 with an optional further low-pass filter having a cut-off wavelength (λlp) selected from the range of >λc2.

9. The light generating system (1000) according to any one of the precedingclaims, wherein the polarization control system (600) is configured to provide an adjustable ratio of first device light (111) having the first linear polarization and first device light (111) having the second linear polarization to the first redirection optical element (515).

10. The light generating system according to any one of the preceding claims,wherein the polarization control system (600) comprises one or more of: (a) a birefringentrotator (610) configured downstream of the first light generating device (110) and upstream of the first redirection optical element (515), wherein the polarization control system (600) is configured to control rotation of the birefringent rotator (610); and wherein the birefringentrotator (610) comprises a λ / 2 waveplate; and (b) a moving device (620) configured to rotatethe first light generating device (110), wherein the polarization control system (600) is configured to control the moving device (620).2023PF80437 6611. The light generating system according to any one of the preceding claims,wherein the light generating system (1000) comprises a rotating element (1250), wherein one or more of the luminescent material (200), the first diffuser (710), and the second diffuser (720) are configured on the rotating element (1250).

12. The light generating system according to any one of the preceding claims,further comprising one or more of condensing and / or collimating optics (560), andintegrating optics (570); wherein condensing and / or collimating optics (560) are configuredat one or more positions selected from: (i) between the first redirection optical element (515) and the luminescent material (200), (ii) between the second redirection optical element (525) and the first diffuser (710), (iii) between the second redirection optical element (525) and the second diffuser (720), and (iv) upstream of the light exit (1090) and downstream of the first redirection optical element (515); and wherein integrating optics (570) are configured at one or more positions selected from: (i) between the first light generating device (110) and the first redirection optical element (515), and (ii) between the second light generating device (120) and the second redirection optical element (525), and (iii) upstream of the light exit (1090) and downstream of the first redirection optical element (515).

13. The light generating system according to any one of the preceding claims,wherein in an operational mode of the light generating system (1000) the system light (1001) is white light having a correlated color temperature selected from the range of 2000-10000 K and a color rendering index of at least 65.

14. The light generating system according to any one of the preceding claims,wherein the control system (300) is configured to control one or more of the spectral power distribution and the radiant flux of the system light (1001) by controlling the polarization control system (600), 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≥500 K.

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

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