Laser-phosphor light source using phosphor in a transmission and a reflection mode

Abstract

The invention provides a light generating system (1000) comprising a first light generating device (110), a second light generating device (120), a luminescent body (210), optionally a first dichroic mirror (521), and a thermally conductive body (500), wherein: the first light generating device (110) is configured to generate first device light (111); wherein the second light generating device (120) is configured to generate second device light (121); the luminescent body (210) comprises a luminescent material (200); wherein the luminescent material (200) is configured to convert (i) at least part of the first device light (111) received by the luminescent material (200), and (ii) at least part of the second device light (121) received by the luminescent material (200), into luminescent material light (201); wherein the luminescent body (210) comprises a first side (211), a second side (212), and a third side (213) bridging the first side (211) and the second side (212); the thermally conductive body (500) a light transmissive section (501); the first side (211) of the luminescent body (210) is configured in a light receiving relationship with the first light generating device (110) via the light transmissive section (501); the second side (212) of the luminescent body (210) is configured in a light receiving relationship with the second light generating device (120); and one or more of part of the first side (211) and at least part of the third side (213) is configured in thermal contact with the thermally conductive body (500); the optional first dichroic mirror (521) is configured between the first light generating device (110) and the luminescent body (210), wherein the first dichroic mirror (521) is configured to have (i) a higher transmission for the first device light (111) than for the luminescent material light (201) and (ii) a higher reflection for the luminescent material light (201) than for the first device light (111); and the light generating system (1000) is configured to generate in a first operational mode of the light generating system (1000) system light (1001) comprising luminescent material light (201).

Description

[0001]2023PF80177 1 LASER-PHOSPHOR LIGHT SOURCE USING PHOSPHOR IN A TRANSMISSION AND A REFLECTION MODE FIELD OF THE INVENTION The invention relates to a light generating system. The invention further relates to a lighting device comprising such light generating system. BACKGROUND OF THE INVENTION Laser-phosphor high-brightness light sources are known in the art. For instance, US2012236536 describes a light-emitting device which can include a fluorescent plate having a first surface and a second surface opposite to the first surface and configured to emit fluorescent light by laser irradiation. A first laser light source can be disposed such that the first surface of the fluorescent plate is irradiated with first laser light. A second laser light source can be disposed such that the second surface of the fluorescent plate is irradiated with second laser light. A reflector can include a light passing hole through which the second laser light can pass and can include a concave reflecting surface configured to cover an irradiation region with the second laser light at least on the fluorescent plate. A lens can be disposed in a space closer to the first surface of the fluorescent plate. WO2021 / 063878A discloses a light generating device having a first blue laser, a second blue laser, a green laser, a red laser, a luminescent element and optics. The luminescent element is excited by the first blue laser for generating luminescent light. The light from the green laser is transmitted through the luminescent element. The light from the green laser, the luminescent light, the light from the red laser and the light from the second blue laser are combined by the optics. US2015 / 184830A discloses a wavelength conversion member that includes a heat conductor, a light guide path and a wavelength converter. The heat conductor has a recessed portion and an opening extending through the heat conductor. The light guide path includes a transparent material with which the opening is filled. The light guide path includes a light exit port disposed on a side of the recessed portion and a light incident port disposed on a side opposite to the recessed portion. The wavelength converter converts first light having a first peak wavelength incident through the light guide path into second light having 2023PF80177 2 a second peak wavelength different from the first peak wavelength. The wavelength converter is disposed in contact with the heat conductor, at least a part of the wavelength converter being embedded in the recessed portion. WO2023 / 126202A discloses a light generating system comprising a first blue laser light source, a second blue laser light source, a third red laser a luminescent material for conversion of the light of the first and second laser into green-orange light. The system generates white light. CN105700281A discloses an assembly consisting of a phosphor wheel, a first light source, a second light source a dichroic mirror and a collimator. The phosphor of the phosphor wheel converts the light of the first and second light source into yellow light. The dichroic mirror reflects the light from the first source to the phosphor wheel and transmits the yellow light generated by the phosphor wheel. SUMMARY OF THE INVENTION High brightness light sources can be used in various applications including spots, stage-lighting, headlamps, home and office lighting, and automotive lighting. For this purpose, laser-phosphor technology can be used, wherein a laser provides laser light and a remote phosphor converts laser light into converted light. A relatively straightforward way to produce white light using lasers is to use laser light in combination with a luminescent converter 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. However, the performance of laser-phosphor technology may be limited by photoexcitation quenching (“photo-quenching”). Further, the intensity of blue laser light may decrease as a function of the path length of the laser light in the (remote) phosphor, reducing the efficiency of the laser-phosphor system at higher depths of the phosphor. Increasing the intensity of the laser light provided to the phosphor to boost the efficiency, or adding additional laser light sources illuminating the same phosphor, may increase the temperature and amount of heat generated in the phosphor, thereby decreasing its lifetime, and causing thermal quenching. Hence, it is an aspect of the invention to provide an alternative light generating system, which preferably further at least partly obviates one or more of above-described 2023PF80177 3 drawbacks. The present invention may have as object to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative. According to a first aspect, the invention provides a light generating system (“system”) comprising a first light generating device, a second light generating device, a luminescent body, and a thermally conductive body. The first light generating device may, in embodiments, be configured to generate first device light having a first peak wavelength (λp1). Further, the first light generating device may comprise a solid state light source. Additionally or alternatively, the second light generating device may, in embodiments, be configured to generate second device light having a second peak wavelength (λp2). The first peak wavelength (λp1) and the second peak wavelength (λp2) are selected from the range of 430-490 nm. Further, the second light generating device may comprise a solid state light source. In embodiments, the solid state light sources (of the first light generating device and / or the second light generating device) may be selected from the group consisting of laser diodes and superluminescent diodes. In further embodiments, the luminescent body may comprise a luminescent material. In such embodiments, the luminescent material may be configured to convert (i) at least part of the first device light received by the luminescent material, and (ii) at least part of the second device light received by the luminescent material, into luminescent material light. Further, the luminescent body may comprise a first side, a second side, and a third side bridging the first side and the second side. In embodiments, the thermally conductive body may comprise a thermally conductive material and may comprise a light transmissive section. Further yet, in embodiments, the first side of the luminescent body may be configured in a light receiving relationship with the first light generating device via the light transmissive section. Additionally or alternatively, the second side of the luminescent body may be configured in a light receiving relationship with the second light generating device. Furthermore, one or more of part of the first side, part of the second side, and at least part of the third side may be configured in thermal contact with the thermally conductive body. In embodiments, the light generating system may be configured to generate, in a first operational mode of the light generating system, system light comprising luminescent material light (based on conversion of at least part of the first device light and at least part of the second device light). In specific embodiments, the light generating system may further comprise a first dichroic mirror. In embodiments, the (optional) first dichroic mirror may be configured between the first light generating device and the luminescent body. Specifically, in embodiments, the (optional) first dichroic mirror may be configured, relative to the first light generating device, upstream of the luminescent body. Additionally, the 2023PF80177 4 (optional) first dichroic mirror may be configured to have a higher transmission for the first device light than for the luminescent material light. Further, in embodiments, the (optional) first dichroic mirror may be configured to have a higher reflection for the luminescent material light than for the first device light. Further, the system may comprise a second dichroic mirror configured relative to the second light generating device downstream of the second light generating device and upstream of the luminescent body. Especially, the second dichroic mirror may be configured (i) to reflect at least part of the second device light and to transmit at least part of the luminescent material light, or (ii) to transmit at least part of the second device light and to reflect at least part of the luminescent material light. Yet, the light generating system may be configured to generate, in a first operational mode of the light generating system, system light comprising luminescent material light. In embodiments, in the first operational mode at least part of the luminescent material light generated by the first device light and at least part of the luminescent material light generated by the second device light may emanate from the second side. The system light may in embodiments comprise contributions of one or more of luminescent material light generated by the first device light (wherein that luminescent material light emanated from the second side) and at least part of the luminescent material light generated by the second device light (wherein that luminescent material light emanated from the second side). Hence, in specific embodiments, the invention provides a light generating system comprising a first light generating device, a second light generating device, a luminescent body, optionally a first dichroic mirror, optionally a second dichroic mirror, and a thermally conductive body, wherein: (A) the first light generating device is configured to generate first device light having a first peak wavelength (λp1); wherein the first light generating device comprises a solid state light source; wherein the second light generating device is configured to generate second device light having a second peak wavelength (λp2); wherein the second light generating device comprises a solid state light source; wherein the solid state light sources are selected from the group consisting of laser diodes and superluminescent diodes; (B) the luminescent body comprises a luminescent material; wherein the luminescent material is configured to convert (i) at least part of the first device light received by the luminescent material, and (ii) at least part of the second device light received by the luminescent material, into luminescent material light; wherein the luminescent body comprises a first side, a second side, and a third side bridging the first side and the second side; (C) the thermally conductive body comprises a thermally conductive material and comprises a light transmissive section; (D) the first side of the luminescent body is configured in a light receiving relationship with the first light generating device via the 2023PF80177 5 light transmissive section; the second side of the luminescent body is configured in a light receiving relationship with the second light generating device; and one or more of part of the first side and at least part of the third side is configured in thermal contact with the thermally conductive body; (E) the (optional) first dichroic mirror is configured between the first light generating device and the luminescent body, wherein the first dichroic mirror is configured to have (i) a higher transmission for the first device light than for the luminescent material light and (ii) a higher reflection for the luminescent material light than for the first device light; (F) the (optional) second dichroic mirror is configured relative to the second light generating device downstream of the second light generating device and upstream of the luminescent body; wherein the second dichroic mirror is configured (i) to reflect at least part of the second device light and to transmit at least part of the luminescent material light, or (ii) to transmit at least part of the second device light and to reflect at least part of the luminescent material light; and (G) the light generating system is configured to generate, in a first operational mode of the light generating system, system light comprising luminescent material light and wherein in the first operational mode at least part of the luminescent material light generated by the first device light and at least part of the luminescent material light generated by the second device light emanates from the second side. With such a system, a laser-phosphor high-brightness light generating system may be provided. Further, such system may allow control over the spectral power distribution of the system light (of the light generating system). Further, such system may in a relatively safe way provide high-brightness light. Further, the system may be relatively compact. Additionally, thermal management of the luminescent body may be provided. In addition to high radiance (or luminance), the system may also provide high optical power, i.e., a high optical power density of the source. Embodiments of the system may be more fail-safe thanks to the reflective configuration for both the luminescent light and device light (see also below). Especially, the system may in embodiments be configured to prevent direct laser beams from being emitted from the system in case the luminescent body or an optical element would fail (e.g. break, fall off, etc.). Overall, an advantage may be that the luminescent body (e.g. a phosphor) may be irradiated from two sides. Hence, photo- quenching may be reduced in the light generating system of the present invention compared to light generating systems comprising a luminescent body configured in a light receiving relationship with (only) one light generating device (irradiated with the same radiant flux). Hence, in embodiments, the light generating system of the present invention may mitigate 2023PF80177 6 photo-quenching. Further, the light generating system as defined herein may, in embodiments, be used as a (laser-phosphor) high-brightness light source. As indicated above, the light generating system may comprise a light generating device. Especially, in embodiments, the light generating system may comprise a first light generating device and a second light generating device. A light generating device may especially be configured to generate device light. Thus, the first light generating device may be configured to generate first device light. Further, the (first) light generating device may comprise a light source (and the second light generating device may comprise a light source). Embodiments of the light sources and light generating devices are described below in general, and may apply to the first light generating device and the second light generating device. The light source may especially be configured to generate light source light. In embodiments, the device light may essentially consist of the light source 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 (other) 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 term “light source” may also relate to a plurality of light sources, such as 2-2000 (solid state) LED light sources. Hence, the term LED may also refer to a plurality of LEDs. Further, the term “light source” may in embodiments also refer to a so-called chip-on-board (COB) light source. The term “COB” especially refers to LED chips in the form of a semiconductor chip that is neither encased nor connected but directly mounted onto a substrate, such as a PCB. Hence, a plurality of light emitting semiconductor light sources may be configured on the same substrate. In embodiments, a COB is a multi LED chip configured together as a single lighting module. The light source may have a light escape surface. Referring to conventional light sources such as light bulbs or fluorescent lamps, it may be an outer surface of a glass or 2023PF80177 7 a quartz envelope. For LED’s it may for instance be the LED die, or when a resin is applied to the LED die, the outer surface of the resin. In principle, it may also be the terminal end of a fiber. The term escape surface especially relates to that part of the light source, where the light actually leaves or escapes from the light source. The light source may be configured to provide a beam of light. This beam of light (thus) escapes from the light exit surface of the light source. Likewise, a light generating device may comprise a light escape surface, such as an end window. Further, likewise a light generating system may comprise a light escape surface, such as an end window. A position where system light escapes from the light generating system may also be indicated as light exit. This may 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 term “light source” may refer to a semiconductor light-emitting device, such as a light emitting diode (LEDs), a laser diode, a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSELs), an edge emitting laser (EEL), a photonic crystal surface emitting laser (PCSEL), a vertical external cavity surface emitting laser (VECSEL), etc... The term “light source” may also refer to an organic light-emitting diode (OLED), such as a passive-matrix (PMOLED) or an active-matrix (AMOLED). In a specific embodiment, the light source comprises a solid-state light source (such as an LED or laser diode). In an embodiment, the light source comprises an LED (light emitting diode). The terms “light source” or “solid state light source” may also refer to a superluminescent diode (SLED). The term LED may also refer to a plurality of LEDs. The light source may especially be configured to generate light source light having an optical axis (O), (a beam shape,) and a spectral power distribution. The light source light may in embodiments comprise one or more bands, having band widths as known for lasers. The term “light source” may (thus) refer to a light generating element as such, like e.g. a solid state light source, or e.g. to a package of the light generating element, such as a solid state light source, and one or more of a luminescent material comprising element and (other) optics, like a lens, a collimator. 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 2023PF80177 8 light source (but may e.g. also be indicated as (white) light generating device). 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”, and similar phrases, may in embodiments refer to a plurality of solid-state light sources selected from at least two different bins. Likewise, the phrases “identical light sources” or “a plurality of same light sources”, and similar phrases, may in embodiments refer to a plurality of solid-state light sources selected from the same bin. 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 laser diode, 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”, or similar terms, refer to a laser diode (or diode laser). Hence, in embodiments the light source comprises 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 cerium doped lithium strontium (or calcium) aluminum fluoride (Ce:LiSAF, Ce:LiCAF), chromium doped chrysoberyl (alexandrite) laser, chromium ZnSe (Cr:ZnSe) laser, divalent samarium doped calcium fluoride (Sm:CaF2) laser, Er:YAG laser, erbium doped and erbium–ytterbium codoped glass lasers, F-Center laser, holmium YAG (Ho:YAG) laser, Nd:YAG laser, NdCrYAG laser, neodymium doped yttrium calcium oxoborate Nd:YCa4O(BO3)3or Nd:YCOB, neodymium doped yttrium orthovanadate (Nd:YVO4) laser, neodymium glass (Nd:glass) laser, neodymium YLF (Nd:YLF) solid-state laser, promethium 147 doped phosphate glass (147Pm3+:glass) solid-state laser, ruby laser (Al O :Cr3+), thulium YAG (Tm:YAG) laser, 3+ 2 3 titanium sapphire (Ti:sapphire; Al2O3:Ti ) laser, trivalent uranium doped calcium fluoride (U:CaF2) solid-state laser, Ytterbium doped glass laser (rod, plate / chip, and fiber), Ytterbium YAG (Yb:YAG) laser, Yb2O3 (glass or 2023PF80177 9 ceramics) laser, etc. For instance, including second and third harmonic generation embodiments, the light source may comprise one or more of an F center laser, an yttrium orthovanadate (Nd:YVO4) laser, a promethium 147 doped phosphate glass (147Pm3+:glass), and a titanium sapphire (Ti:sapphire; Al2O3:Ti3+) laser. For instance, considering second and third harmonic generation, such light sources may be used to generated blue light. 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. A laser may be combined with an upconverter in order to arrive at shorter (laser) wavelengths. For instance, with some (trivalent) rare earth ions upconversion may be obtained or with non-linear crystals upconversion can be obtained. Alternatively, a laser can be combined with a downconverter, such as a dye laser, to arrive at longer (laser) wavelengths. Preferably, the light source is a light source that during operation emits (light source light) comprising at least light at a wavelength selected from the range of 200-490 nm, especially a light source that during operation emits at least light at a wavelength selected from the range of 400-490 nm, even more especially in the range of 440-490 nm. This light may partially be used by the luminescent material (see further also below). Hence, in a specific embodiment, the light source is configured to generate blue light. 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 specific embodiments, the term “laser light source” may refer to a plurality N of (identical) laser light sources. In embodiments, N=2, or more. In specific embodiments, N may be at least 5, such as especially at least 8. In this way, a higher brightness may be obtained. In embodiments, laser light sources may be arranged in a laser bank (see also below). 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 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 2023PF80177 10 collimated light source light. In yet further embodiments, the light source light is especially (collimated) laser light source light. The laser light source light may in embodiments comprise one or more bands, having band widths as known for lasers. In specific embodiments, the band(s) may be relatively sharp line(s), such as having full width half maximum (FWHM) in the range of less than 20 nm at RT, such as equal to or less than 10 nm. Hence, the light source light has a spectral power distribution (intensity on an energy scale as function of the wavelength) which may comprise one or more (narrow) bands. The beams (of light source light) may be focused or collimated beams of (laser) light source light. The term “focused” may especially refer to converging to a small spot. This small spot may be at the discrete converter region, or (slightly) upstream thereof or (slightly) downstream thereof. Especially, focusing and / or collimation may be such that the cross-sectional shape (perpendicular to the optical axis) of the beam at the discrete converter region (at the side face) is essentially not larger than the cross-section shape (perpendicular to the optical axis) of the discrete converter region (where the light source light irradiates the discrete converter region). Focusing may be executed with one or more optics, like (focusing) lenses. Especially, two lenses may be applied to focus the laser light source light. Collimation 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 dopes 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 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. 2023PF80177 11 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 of a broad spectrum like an LED, while having a brightness in the order of a laser diode. Hence, an SLD may especially be a semiconductor light source, where the spontaneous emission light is amplified by stimulated emission in the active region of the device. Such emission is called “super luminescence”. Superluminescent diodes 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. Especially, with varying electrical current, the spectral power distribution of the superluminescent diode may vary. In this way the spectral power distribution can be controlled. In specific embodiments, the solid state light source may comprise a superluminescent diode. For instance, in further specific embodiments, the solid state light source may comprise a GaN-based superluminescent diode, or an InGaN-based superluminescent diode, or an AlGaN-based superluminescent diode. In specific embodiments, the device light may be blue light. The terms “blue light” or “blue emission”, and similar terms, may especially relate to light having a wavelength in the range of about 430-490 nm (including some violet and cyan hues). In specific embodiments, the blue light may have a centroid wavelength in the 430-490 nm range, such as in the 440-490 nm range. In specific embodiments, the peak wavelength (λp) of the device light is selected from the blue wavelength range. In embodiments, the first light generating device and / or the second light generating device comprises a light source selected from a laser diode and a superluminescent diode. Hence, especially the first light generating device and / or the second light generating device may comprise a solid state light source. More especially, the device light may be laser light. In embodiments, the first light generating device may be configured to generate first device light. Especially, the first light generating device may be configured to generate first device light along a first optical axis (O1). In general, an optical axis (O) may be defined as an axis, starting at a light generating device, along which (on average) device light propagates during operation of the light generating device. Further, the first device light may comprise a first peak wavelength (λp1). The term “peak wavelength”, also indicated as λp, is known in the art, and refers to the wavelength value where the radiometric emission spectrum of the light source reaches its 2023PF80177 12 maximum; the value is stated in nanometers (nm). It is the wavelength for which, upon derivatization of an emission spectrum, a derivative of 0 is found as expressed by the formula λp = I’(λ) = 0, where I(λ) is the spectral energy density of the light emitted by a light generating device as a function of the wavelength λ. The peak wavelength (λp) may e.g. be determined at operation conditions. In embodiments, the first device light may have a first peak wavelength (λp1) selected from the range of 200-490 nm, such as 400-490 nm, especially 430-490 nm. Hence, in specific embodiments, the first light generating device may be configured to generate device light having a peak wavelength (λp1) in the blue wavelength region. Further, the light generating system may comprise a second light generating device. The second light generating device may be configured to generate second device light. Especially, the second light generating device may be configured to generate second device light along a second optical axis (O2). Hence, in embodiments, the second light generating device may comprise a light source, especially a solid state light source (see above). In embodiments, the second light generating device may comprise the same light source as the first light generating device. Yet, in embodiments, the second light generating device may comprise a light source different from the light source of the first light generating device. Especially, in embodiments, the second light generating device may comprise a light source selected from the group consisting of laser diodes and superluminescent diodes. In embodiments, the second device light may have essentially the same spectral power distribution as the first device light. Specifically, in such embodiments, a second peak wavelength (λp2) of the second device light may be equal to the first peak wavelength (λp1) of the first device light, λp1 = λp2. Yet, in (other) specific embodiments, the second light generating device may provide second device light having a spectral power distribution different from the first device light. In such embodiments, the second peak wavelength (λp2) may (still) essentially be equal to the first peak wavelength (λp1), λp1 = λp2. In embodiments, the first peak wavelength (λp1) and the second first peak wavelength (λp2) may differ at maximum 10 nm, more especially the first peak wavelength (λp1) and the second first peak wavelength (λp2) may differ at maximum 5 nm, such as at maximum 2 nm. Yet, in alternative embodiments, the second device light may have a second peak wavelength (λp2) different from the first peak wavelength (λp1), λp1≠ λp2. A difference in peak wavelength (λp) between the first and second device light is not necessary, but may allow further temperature control. Especially, in embodiments the first device light is fully absorbed by the luminescent body. Hence, in embodiments the first peak wavelength (λp1) 2023PF80177 13 may be closer to an excitation maximum of the luminescent material. However, the second device light may propagate from the second side to the first side, and be reflected, providing a potential larger absorption length. By choosing a peak wavelength that is further away from the excitation maximum, the absorption per distance may be lower, whereas an overall absorption over the optical path may be relatively high as the optical path may be propagated twice in the reflective mode. Hence, in specific embodiments, the first peak wavelength (λp1) and the second peak wavelength (λp2) may differ by at least 10 nm, such as over 10 nm, especially at least 15 nm. Further, in embodiments, the first peak wavelength (λp1) and the second peak wavelength (λp2) may differ by at most 80 nm, such as at most 50 nm, especially at most 35 nm. In such embodiments, especially the first device light (comprising the first peak wavelength (λp1)) may have a higher absorption per distance than the second device light (comprising the second peak wavelength (λp2)). Thus, in embodiments, the luminescent material may have a wavelength- dependent absorption strength (A), wherein the wavelength-dependent absorption strength (A) may be defined by the molar extinction coefficient (ε) of the luminescent material at that wavelength. Further, the luminescent material may have a maximum absorption wavelength ("excitation maximum”) λex, whereby the molar extinction coefficient (ε) is largest at the maximum absorption wavelength λex. In embodiments, λexmay be equal to one or more of the first peak wavelength (λp1) and the second peak wavelength (λp2). Further, λex may be equal to either the first peak wavelength (λp1) or the second peak wavelength (λp2), especially to the first peak wavelength (λp1). Further yet, in embodiments, neither the first peak wavelength (λp1) or the second peak wavelength (λp2) may be equal to λex. Yet, in embodiments, the absorption strength (A) of the luminescent material may be higher at either the first peak wavelength (λp1) or the second peak wavelength (λp2). In specific embodiments, the luminescent material may have an absorption strength (A) of y% ≤ A ≤ 100% Amax for one of the first peak wavelength (λp1) and the second peak wavelength (λp2), and 20% ≤ A ≤ y% Amax for the other of the first peak wavelength (λp1) and the second peak wavelength (λp2). Here, Amaxis the maximum absorption strength of the luminescent material (at λex), and y may be selected from the range of 70-95. Further, in embodiments, the absorption strengths of the luminescent material at the first peak wavelength (λp1) and the second peak wavelength (λp2) may differ by at least 5% Amax, such as at least 10% Amax, especially at least 15% Amax. Additionally or alternatively, in embodiments, the absorption strengths of the luminescent material at the first peak wavelength (λp1) and the second peak wavelength (λp2) may differ by at most 50% Amax, such as at most 40% Amax, especially at 2023PF80177 14 most 30% Amax. In embodiments, the absorption strength (A) of the luminescent material may be higher at the first peak wavelength (λp1). For example, the luminescent material may have an absorption strength of A = 90% Amax at the first peak wavelength (λp1), and an absorption strength of A = 50% Amax at the second peak wavelength (λp2). Further, in specific embodiments, one of the following may apply: (a) the first peak wavelength (λp1) and the second peak wavelength (λp2) may differ at least 10 nm, wherein the luminescent material may have a higher absorption strength at the first peak wavelength (λp1) than at the second peak wavelength (λp2), and (b) the first peak wavelength (λp1) and the second peak wavelength (λp2) may differ at maximum 5 nm. In embodiments, the wavelength where Amaxis found may be the same wavelength as an excitation maximum in an excitations spectrum (of the luminescent material). Hence, in embodiments “the absorption strengths of the luminescent material at the first peak wavelength (λp1) and the second peak wavelength (λp2) may differ by 50% Amax” and similar phrases, may e.g. refer to a first peak wavelength (λp1) at an excitation maximum and a second peak wavelength (λp2) at a wavelength where the absorption (or excitation) is 50% of the absorption (or excitation) at the excitation maximum, or a first peak wavelength (λp1) at a wavelength where the absorption (or excitation) is 90% of that at an excitation maximum and a second peak wavelength (λp2) at a wavelength where the absorption (or excitation) is 40% of that at the same excitation maximum. Hence, in embodiments A may scale with the oscillator strength of the luminescent material. Therefore, in embodiments Aλp1 / Aλp2 may essentially be the same as ελp1 / ελp2, wherein “ε” refers to the extinction coefficient. In embodiments, the luminescent body may comprise the luminescent material. The term “luminescent material” may especially refer to a material that can convert first radiation, especially one or more of UV radiation and blue radiation, 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. In general, the second radiation has a spectral power distribution at larger wavelengths than the first radiation, which is the case in 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 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 2023PF80177 15 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 with a smaller wavelength is converted into radiation with a larger wavelength (λex<λem), though in specific embodiments the luminescent material may comprise up-converter luminescent material, i.e. radiation with a larger wavelength is converted into radiation with a smaller wavelength (λex>λem). In embodiments, the term “luminescence” may refer to phosphorescence. In embodiments, the term “luminescence” may also refer to fluorescence. Instead of the term “luminescence”, also the term “luminescent material light” or “emission” may be applied. Hence, the terms “first radiation” and “second radiation” may refer to excitation radiation and emission (radiation), respectively. Likewise, the term “luminescent material” may in embodiments refer to phosphorescence and / or fluorescence. The term “luminescent material” may also refer to a plurality of different luminescent materials. Examples of possible luminescent materials are indicated below. Hence, the term “luminescent material” may in specific embodiments also refer to a luminescent material composition. Further, in embodiments, the luminescent body may comprise a plurality of luminescent materials. For example, the luminescent body may comprise a first luminescent material configured to generate (upon irradiation) green-yellow light, and a second luminescent material configured to generate red light. Optionally, in embodiments, the luminescent body may comprise an (additional) luminescent material configured to generate blue-green light. In embodiments, when the first device light and second device light have different spectral power distributions, the first device light may lead to a different spectral power distribution of the luminescent material light than the second device light. In such embodiments, the spectral power distribution of the system light may also depend upon the radiant fluxes of the first device light and the second device. Specifically, in further embodiments, the correlated color temperature (CCT) of the system light may be tuned by adjusting the relative intensities of the first and second device light. As such, the light generating system may allow CCT control. Hence, in embodiments at least part of the first device light may be converted into (first) luminescent material light and at least part of the second device light may be converted into (second) luminescent material light. Herein, the luminescent material light emanating from the second side of the luminescent body is indicated as “luminescent material light. This luminescent material light may thus comprise a contribution of 2023PF80177 16 luminescent material light generated by the first device light (and may be indicated as “first luminescent material light”) and / or a contribution of luminescent material light generated by the second device light (and may be indicated as “second luminescent material light”). When there is a single luminescent material and / or when the spectral power distributions of the first device light and second device light are essentially the same, the first luminescent material light and second luminescent material light will have (essentially) the same spectral power distributions. However, when there are two or more different luminescent materials comprised by the luminescent body, and the spectral power distributions of the first device light and second device light differ, the first luminescent material light and second luminescent material light may (but not necessarily) have different spectral power distributions. Whether or not there is a difference may depend upon the difference in the spectral power distributions and the differences in the excitation spectra of the two or more different luminescent materials. Instead of the term “luminescent material” also the term “phosphor” may be applied. These terms are known to the person skilled in the art. In embodiments, luminescent materials may be selected from garnets and nitrides, especially doped with trivalent cerium or divalent europium, respectively. The term “nitride” may also refer to oxynitride or nitridosilicate, etc. Alternatively or additionally, the luminescent material(s) may be selected from silicates, especially doped with divalent europium. In specific embodiments, the luminescent material may at least comprise a luminescent material of the type A3B5O12:Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc; and wherein the device light may comprise blue device light. Especially, A may comprise one or more of Y, Gd and Lu, such as especially one or more of Y and Lu. Especially, B may comprise one or more of Al and Ga, more especially at least Al, such as essentially entirely Al. Hence, especially suitable luminescent materials are cerium comprising garnet materials. Embodiments of garnets especially include A3B5O12garnets, wherein A comprises at least yttrium (Y) or lutetium (Lu) and wherein B comprises at least aluminum (Al). Such garnets may be doped with cerium (Ce), with praseodymium (Pr) or a combination of cerium and praseodymium; especially however with Ce. Especially, B may comprise aluminum (Al); however, in addition to aluminum, B may also partly comprise gallium (Ga) and / or scandium (Sc) and / or indium (In), especially up to about 20% of B, more especially up to about 10 % of B (i.e. the B ions essentially consist of 90 or more mole % of Al and 10 or less mole % of 2023PF80177 17 one or more of Ga, Sc and In); B may especially comprise up to about 10% gallium. In another variant, B and O may at least partly be replaced by Si and N. The element A may especially be selected from the group consisting of yttrium (Y), gadolinium (Gd), terbium (Tb) and lutetium (Lu). Further, Gd and / or Tb are especially only present up to an amount of about 20% of A. In a specific embodiment, the garnet luminescent material comprises (Y1-xLux)3B5O12:Ce, wherein x is equal to or larger than 0 and equal to or smaller than 1. The term “:Ce”, indicates that part of the metal ions (i.e. in the garnets: part of the “A” ions) in the luminescent material is replaced by Ce. For instance, in the case of (Y1-xLux)3Al5O12:Ce, part of Y and / or Lu is replaced by Ce. This is known to the person skilled in the art. Ce will replace A in general for not more than 10%; in general, the Ce concentration will be in the range of 0.1 to 4%, especially 0.1 to 2% (relative to A). Assuming 1% Ce and 10% Y, the full correct formula could be (Y0.1Lu0.89Ce0.01)3Al5O12. Ce in garnets is substantially or only in the trivalent state, as is known to the person skilled in the art. In embodiments, the luminescent material (thus) comprises A3B5O12 wherein in specific embodiments at maximum 10% of B-O may be replaced by Si-N. 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(Lu,Gd)x2Cex3)3(Aly1Gay2)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 (Yx1Cex3)3Al5O12, wherein x1+x3=1, and wherein 0<x3≤0.2, such as 0.001-0.1. In specific embodiments, the luminescent body may only include luminescent materials selected from the type of cerium comprising garnets. In even further specific embodiments, the luminescent body may include a single type of luminescent material, such as (Yx1A’x2Cex3)3(Aly1B’y2)5O12. Hence, in specific embodiments the luminescent body comprises luminescent material, wherein at least 85 weight%, even more especially at least 2023PF80177 18 about 90 wt.%, such as yet even more especially at least about 95 weight % of the luminescent material comprises (Yx1A’x2Cex3)3(Aly1B’y2)5O12. Here, 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, wherein x1+x2+x3=1, wherein x3>0, wherein 0<x2+x3≤0.2, wherein y1+y2=1, wherein 0≤y2≤0.2. Especially, x3 is selected from the range of 0.001-0.1. Note that in embodiments x2=0. Alternatively or additionally, in embodiments y2=0. In 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 embodiments, the luminescent material may alternatively or additionally comprise one or more of MS:Eu2+ and / or M Si N :Eu2+ and / or MAlSiN :Eu2+ an 2+ 2 5 8 3 d / or Ca2AlSi3O2N5:Eu , 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. The material (Ba,Sr,Ca)S:Eu can also be indicated as MS:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound calcium or strontium, or calcium and strontium, more especially calcium. Here, Eu is introduced and replaces at least part of M (i.e. one or more of Ba, Sr, and Ca). Further, the material (Ba,Sr,Ca)2Si5N8:Eu can also be indicated as M2Si5N8:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound Sr and / or Ba. In a further specific embodiment, M consists of Sr and / or Ba (not taking into account the presence of Eu), especially 50 to 100%, more especially 50 to 90% Ba and 50 to 0%, especially 50 to 10% Sr, such as Ba1.5Sr0.5Si5N8:Eu (i.e.75 % Ba; 25% Sr). Here, Eu is introduced and replaces at least 2023PF80177 19 part of M, i.e. one or more of Ba, Sr, and Ca). Likewise, the material (Ba,Sr,Ca)AlSiN3:Eu can also be indicated as MAlSiN3:Eu, wherein M is one or more elements selected from the group consisting of barium (Ba), strontium (Sr) and calcium (Ca); especially, M comprises in this compound calcium or strontium, or calcium and strontium, more especially calcium. Here, Eu is introduced and replaces at least part of M (i.e. one or more of Ba, Sr, and Ca). Eu in the above indicated luminescent materials is substantially or only in the divalent state, as is known to the person skilled in the art. The term “luminescent material” herein especially relates to inorganic luminescent materials. Alternatively or additionally, also other luminescent materials may be applied. For instance quantum dots and / or organic dyes may be applied and may optionally be embedded in transmissive matrices like e.g. polymers, like PMMA, or polysiloxanes, etc. Especially, the luminescent material may be configured to convert (first and / or second) device light received by the luminescent material into luminescent material light. Hence, the luminescent material may be configured in the system such that, together with one or more optical elements, (first and / or second) device light may reach the luminescent material. More especially, at least part of the (first and / or second) device light may reach the luminescent material, such as at least 50% of the device light, like at least 60% of the device light, especially at least 70% of the device light. In embodiments, the luminescent material may be configured to convert first device light received by the luminescent material into first luminescent material light. Analogously, in embodiments, the luminescent material may be configured to convert second device light received by the luminescent material into second luminescent material light. In such embodiments, the first luminescent material light and the second luminescent material light may together be referred to as luminescent material light. Hence, in embodiments, the luminescent material light may be based on conversion of at least part of the first device light and / or at least part of the second device light, more especially on conversion of essentially all of the first device light and / or at least part of the second device light. Especially, the luminescent material is 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, or a reflective support in the reflective mode). Especially, the luminescent body may essentially be self- supporting. In embodiments, the luminescent material may be provided as luminescent body, such as a luminescent single crystal, a luminescent glass, or a luminescent ceramic body. 2023PF80177 20 Such body may be indicated as “converter body” or “luminescent body”. In embodiments, the luminescent body may be a luminescent single crystal or a luminescent ceramic body. For instance, in embodiments a cerium comprising garnet luminescent material may be provided as a luminescent single crystal or as a luminescent ceramic body. In other embodiments, the luminescent body may comprise a light transmissive body, wherein the luminescent material is embedded. For instance, the luminescent body may comprise a glass body, with luminescent material embedded therein. Or, the glass as such may be luminescent. In other embodiments, the luminescent body may comprise a polymeric body, with luminescent material embedded therein. The luminescent body may have any shape. In general, however, the luminescent body may comprise two essentially parallel faces, defining a height (of the luminescent body). In embodiments, two essentially parallel faces may define a first side and a second side of the luminescent body. Further, the luminescent body may comprise a third side (or “edge face”), bridging the first side and second side. The edge face may be curved in one or two dimensions. The edge face may be planar. The luminescent body may have a rectangular or circular cross-section, though other cross-sections may also be possible, like e.g. hexagonal, octagonal, etc. Hence, the luminescent body may have a circular cross- section, an oval cross-section, square, or non-square rectangular. In embodiments, the luminescent body may have an n-gonal cross-section, wherein n is at least 3, like 4 (square or rectangular cross-section), 5 (pentagonal cross-section), 6 (hexagonal cross-section), 8 (octagonal cross-section) or higher. Further, the luminescent body may, in embodiments, comprise a (luminescent body) axis (A1), wherein the (luminescent body) axis (A1) (or “axis (A1)”) may be configured perpendicular to the first side and the second side, and intersecting the geometrical center of the cross-section. The first side and second side may also be indicated as “main faces”, as they may especially provide the largest external area of the luminescent body. Perpendicular to the afore-mentioned cross-section, may be another cross- section, which may in embodiments be rectangular. Hence, the luminescent body may e.g. have a cubic shape, a (non-cubic) cuboid shape, an n-gonal prism shape with n being at least 5 (such as pentagonal prism, hexagonal prism), and a cylindrical shape. Other shapes, however, may also be possible. Especially, the luminescent body may have a cuboid shape, a cylindrical shape, or an n-gonal prism shape wherein n is 6 or 8. In embodiments, the luminescent body (or “body”) has lateral dimensions width or length (W1 or L1) or diameter (D1) and a thickness or height (H1). In embodiments, (i) D1≥H1 or (ii) W1≥H1 and / or L1≥H1. The luminescent body may be transparent or light 2023PF80177 21 scattering. In embodiments, the luminescent body may comprise a ceramic luminescent material. In specific embodiments, L1≤10 mm, such as especially L1≤5mm, more especially L1≤3mm, most especially L1≤2 mm. In specific embodiments, W1≤10 mm, such as especially W1≤5mm, more especially W1≤3mm, most especially W1≤2 mm. In specific embodiments, H1≤10 mm, such as especially H1≤5mm, more especially H1≤3mm, most especially H1≤2 mm. In specific embodiments, D1≤10 mm, such as especially D1≤5mm, more especially D1≤3mm, most especially D1≤2 mm. In specific embodiments, the body may have in embodiments a height (H1) in the range 50 µm - 1 mm. Further, the body may have lateral dimensions (width / diameter) in the range 100 µm – 10 mm. In yet further specific embodiments, (i) D1>H1 or (ii) W1>H1 and L1>H1. Especially, the lateral dimensions like length, width, and diameter are at least 2 times, like at least 5 times, larger than the height. In specific embodiments, the luminescent body has a first length L1, a first height H1, and a first width W1, wherein H1≤0.5*L1 and H1≤0.5*W1. In embodiments, the luminescent body may be a (small) tile. In embodiments, during propagation of the device light, especially the first device light, through the luminescent body, the optical power of the first device light may be decreased due to absorption of the first device light by the luminescent body. The rate at which the optical power of the first device light is reduced may depend on the first peak wavelength (λp1) and / or the luminescent material comprised by the luminescent body. Especially, in embodiments, the rate at which the optical power of the first device light is reduced may depend on the absorption strength of the luminescent material (comprised by the luminescent body) at the first peak wavelength (λp1), the concentration of luminescent material in the luminescent body, and the height of the luminescent body. As such, in embodiments, the concentration and absorption strength (at the first peak wavelength (λp1)) of the luminescent material may define a first absorption height (H1a) of the luminescent body. The first absorption height (H1a) may especially be the distance the first device light would need to travel within a luminescent body to allow absorption of at least 98% of the first device light at the first peak wavelength (λp1) (assuming propagation parallel to an optical axis of the first device light, and especially assuming perpendicular irradiation with the first device light). Hence, the first absorption height (H1a) may especially be the distance the first device light would need to travel within a luminescent body to allow transmission of at maximum 2% of the first device light at the first peak wavelength (λp1) (assuming propagation parallel to an optical axis of the first device light, and especially assuming 2023PF80177 22 perpendicular irradiation with the first device light). The height of the luminescent body may also be indicated as “thickness”. In embodiments, the first absorption height (H1a) may be roughly equal to the first height (H1). Thus, in embodiments, 0.7*H1 ≤ H1a ≤ H1, such as 0.8*H1 ≤ H1a ≤ H1, especially 0.9*H1≤ H1a≤ H1. In such embodiments, the first height (H1) may be selected such that, upon irradiation of the luminescent body with first device light, ≤ 10%, such as ≤ 5%, more especially ≤ 2% of the first device light may be transmitted through the luminescent body (without being converted into (first) luminescent material light). Hence, in specific embodiments, the luminescent body may have a first height (H1) as defined herein; wherein the first peak wavelength (λp1) and the luminescent body may be selected such that at least 98% of the first device light at the first peak wavelength (λp1) is absorbed over a first absorption height (H1a) of the luminescent body, wherein H1a ≤ H1, especially wherein 0.9*H1 ≤ H1a ≤ H1. Hence, in embodiments the luminescent body may have a first height (H1), wherein the first peak wavelength (λp1) and the luminescent body are selected such that at maximum 2% of the first device light at the first peak wavelength (λp1) is transmitted over a first absorption height H1a of the luminescent body, wherein H1a ≤ H1, especially wherein 0.9*H1≤ H1a≤ H1. In embodiments, it may be advantageous that (essentially) no first device light is transmitted through the luminescent body, such as ≤ 1%, especially ≤ 0.1%. As such, radiation damage to the second light generating device may be reduced or essentially prevented. Further, such a configuration may prevent (unconverted) first device light and / or second device light from escaping the light generating system, thereby preventing damage to the system and / or consumers. Thus, in embodiments, the first height (H1) may especially be (substantially) larger than the first absorption height (H1a) of the luminescent body, 1.5*H1a≤ H1 ≤ 10*H1a, such as 2*H1a ≤ H1 ≤ 8*H1a, especially 3*H1a ≤ H1 ≤ 6*H1a. Further, in specific embodiments, the first peak wavelength (λp1) and the luminescent body may be selected such, that 3*H1a≤ H1≤ 6*H1a. Hence, when H1is substantially larger than H1aessentially no first device light may be transmitted through the luminescent body. Therefore, in (such) embodiments, the system light may essentially not comprise first device light. Hence, in embodiments essentially no first device light irradiating the first side may escape from the second side; i.e. “full conversion”. In yet other embodiments, it may be desired that at least part of the first device light is transmitted through the luminescent body, and propagates together with the 2023PF80177 23 luminescent material light to the external of the system. Especially, in case a second dichroic mirror is applied, this may be an option when the first peak wavelength (λp1) is larger than the second peak wavelength (λp2). This may then allow reflection or transmission of the luminescent material light and the remaining first device light, and transmission or reflection, respectively, of the second device light. Especially, in such embodiments | λp1- λp2|≥10 nm. For instance, in such embodiments H1 ≤ H1a ≤ 5*H1, such as 1.2*H1 ≤ H1a ≤ 4*H1, especially 1.5*H1 ≤ H1a ≤ 4*H1. Hence, when H1a is (substantially) larger than H1 first device light may be transmitted through the luminescent body. Therefore, in (such) embodiments, the system light may comprise first device light (if not (optically) filtered out). Hence, in embodiments first device light irradiating the first side may escape from the second side; i.e. “partial conversion”. In embodiments, the first side may be configured in a light receiving relationship with the first light generating device. Further, in embodiments, the first side may be configured (at least partly) facing the first light generating device. In such embodiments, the axis (A1) may have a first (irradiation) angle (α1) with the first optical axis (O1) selected from the range of 0-60°, such as 0-45°, especially 0-30°. In embodiments, a smaller first angle (α1) may have as advantage that reflection and / or scattering of the first device light by the first side may be reduced compared to a larger first angle (α1). Yet, in embodiments, at larger first angles (α1), the first height (H1) of the luminescent body may be reduced as in such embodiments the optical path length of the first device light in the luminescent body may be increased. In embodiments, the first optical axis (O1) may not be reflected and / or undergo a directional change between the first light generating device and the first side. In such embodiments, the light escape surface of the first light generating device may be configured at an angle with the first side, wherein the angle may be equal to the first angle (α1). Here, for explanatory purposes, it is assumed that the light escape surface and first side are configured perpendicular to the first optical axis (O1) and the axis (A1), respectively, though this need not be the case. Yet, in embodiments, the first optical axis (O1) may have a (first optical path) angle (β1) (unequal to 90°) between a (first) part of the first optical axis (O1) extending from the first light generating device, and a (second) part of the first optical axis (O1) intersecting the luminescent body. This may allow more flexibility in providing a light generating system with a specific shape and / or size, such as a relatively thin light generating system. In embodiments, the angle (β1) may be selected from the range of 60-90°. Further, in 2023PF80177 24 embodiments, the (optical path) angle (β1) may be selected from the range of 0-15°, such as 0-10°, especially 0-5°. In specific embodiments, the first angle (α1) may be selected from the range of 0-30°, and the angle (β1) may be (essentially) 0°. Further, in specific embodiments, the first angle (α1) may be (essentially) 0°, and the angle (β1) may be selected from the range of 60-90°. Similarly, in embodiments, the axis (A1) may have a second (irradiation) angle (α2) with the second optical axis (O2) selected from the range of 0-30°, such as 0-20°, especially 0-10°. Further, in embodiments, the second optical axis (O2) may have a (second optical path) angle (β2) as defined above. In embodiments, the angle (β2) may be selected from the range of 60-90°. Further, in embodiments, the angle (β2) may be selected from the range of 0-15°. In embodiments, only part of the first side may be irradiated by the first device light. Hence, in embodiments the (smallest) cross-sectional dimensions of the light transmissive section may be smaller than the cross-sectional dimensions of the luminescent body. For instance, in embodiments, a first irradiation area selected from the range of 1-30% of a (total) area of the first side may be irradiated by the first device light (assuming a beam of first device light defined by its full width half maximum). Yet, assuming a beam of second device light defined by its full width half maximum, only part of the second side may be irradiated by the beam of second device light. For instance, in embodiments, a second irradiation area selected from the range of 1-30% of a (total) area of the second side may be irradiated by the second device light. In embodiments, the luminescent body may be configured in thermal contact with a thermally conductive body. For instance, the luminescent body may be configured in thermal contact with a thermally conductive body via at least part of the third side. Further, in embodiments, (essentially) the full third side may be configured in thermal contact with the thermally conductive body. Hence, at least 60% of the third side may be configured in thermal contact with the thermally conductive body, such as at least 75%, especially at least 90%, including 100%. In embodiments, the thermally conductive body may be configured around the luminescent body. In such embodiments, the first and / or second side may be (at least partially) exposed, yet the third side may be essentially fully covered by the thermally conductive body. In specific embodiments, the third side may be in physical contact with the thermally conductive body. Further, in embodiments, part of the second side may be configured in thermal contact with the thermally conductive body. In specific embodiments, 1-50% of the second side may be configured in thermal contact with the thermally conductive 2023PF80177 25 body, such as 2-40%, especially 5-30%. In embodiments, at least part of the second side may be covered by, such as be in physical contact with, the thermally conductive body. Further yet, in embodiments, part of the first side may be configured in thermal contact with the thermally conductive body (optionally via a first dichroic mirror (see below)). Especially, in embodiments, at least 20% of the first side may be configured in thermal contact with the thermally conductive body, such as at least 40%, especially at least 60%. Additionally, at most 98% of the first side may be configured in thermal contact with the thermally conductive body, such as at most 95%, especially at most 90%. In specific embodiments, the system may comprise a first dichroic mirror configured between the first side and the thermally conductive body (see below). In such embodiments, the first dichroic mirror may especially comprise thermally conductive material. In embodiments, the thermally conductive body may comprise a recess. The recess may be configured to host at least part of the luminescent body. Specifically, the recess may be configured to host the luminescent body over at least part of the first height (H1). In embodiments, the recess may be a through hole. In specific embodiments, this may be a cylindrical through hole or a cubic through hole, or a rectangular cuboid. In such embodiments, the through hole may have two openings, with a second opening at the second side of the luminescent body and a first opening at the first side of the luminescent body, which openings may have essentially the same dimensions. In other embodiments, the recess may be a hole in the thermally conductive body over part of its height, with a larger opening at the second side of the luminescent body and a smaller opening at the first side of the luminescent body. Such holes over part of the height may e.g. have cylindrical through shape or a cubic shape, or a rectangular cuboid shape, but may also be tapering. In embodiments, the recess may be configured to host the luminescent body over at least 50%, such as at least 65%, especially at least 80%, including 100% of the first height (H1). Further, the thermally conductive body may be configured to host the luminescent body over at least 50%, such as at least 65%, especially at least 80%, including 100% of a volume of the luminescent body. Hence, in specific embodiments, the luminescent body may be configured completely within the recess. Additionally, in specific embodiments, the luminescent body may have a first height (H1); wherein further the thermally conductive body may comprise a recess configured to host at least part of the luminescent body, such that over at least part of the first height (H1) the luminescent body is configured in the recess; 2023PF80177 26 wherein at least part of the third side is configured in thermal contact with the thermally conductive body. Hence, in embodiments, the recess may have a height (H2) parallel to the first height (H1), wherein the height (H2) may be selected from the range of 0.5*H1 ≤ H2 ≤ 1.2*H1, such as 0.65*H1 ≤ H2 ≤ 1.1*H1, especially 0.8*H1 ≤ H2 ≤ 1.05*H1. Further, in embodiments, the recess may have lateral dimensions, such as a width (W2) and length (L2). In embodiments, the width (W2) of the recess may be selected from the range of ≤10 mm, such as ≤5mm, especially ≤3mm, more especially ≤2 mm. Additionally, in embodiments, the length (L2) of the recess may be selected from the range of ≤10 mm, such as ≤5mm, especially ≤3mm, more especially ≤2 mm. In embodiments, the recess may have a circular cross-section perpendicular to the height (H2). In such embodiments, the recess may have an equivalent circular diameter (D2), wherein the diameter (D2) may be selected from the range of ≤10 mm, such as ≤5mm, especially ≤3mm, more especially ≤2 mm. In specific embodiments, (i) D2>H2 or (ii) W2>H2 and L2>H2. Especially, the lateral dimensions like length (L2), width (W2), and diameter (D2) may be at least 2 times, like at least 5 times, larger than the height (H2). In specific embodiments, the recess has a length L2, a height H2, and a width W2, wherein H2≤0.5*L2 and H2≤0.5*W2. Such a configuration may provide a relatively large thermal contact area between the luminescent body and the thermally conductive body. This may have as advantage that the lifetime of the luminescent body may be extended. Further, in embodiments, the sides of the recess, especially the sides of the recess in (thermal) contact with the luminescent body, may comprise reflective material. Especially, the sides of the recess may comprise reflective material configured to reflect at least part of the device light and / or the luminescent material light. Specifically, the sides of the recess may be configured to reflect one or more of (a) at least 70%, such as at least 80%, especially at least 90%, including (essentially) all of the first device light, (b) at least 70%, such as at least 80%, especially at least 90%, including (essentially) all of the second device light, and (c) at least 70%, such as at least 80%, especially at least 90%, including (essentially) all of the luminescent material light received by the sides of the recess. This may decrease the amount of optical power lost due to absorption of light by the thermally conductive body, thereby increasing the efficiency of the light generating system. In embodiments, the thermally conductive body may comprise a thermally conductive material. 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 2023PF80177 27 at least about 10 W / (m*K). In embodiments, the thermally conductive material may comprise one or more of copper, aluminum, silver, gold, silicon carbide, aluminum nitride, boron nitride, aluminum silicon carbide, beryllium oxide, a silicon carbide composite, aluminum silicon carbide, a copper tungsten alloy, a copper molybdenum carbide, carbon, diamond, and graphite. Alternatively, or additionally, the thermally conductive material may comprise or consist of aluminum oxide. In embodiments, the thermally conductive body may comprise one or more of a heatsink, a heat spreader, and a two-phase cooling device. In yet other embodiments, the thermally conductive body may be configured in thermal contact with one or more of a heatsink, a heat spreader, and a two-phase cooling device, and may e.g. transfer heat to such heatsink, heat spreader, or two-phase cooling device, via another thermally conductive body. An element may be considered in “thermal contact” with another element if it can exchange energy through the process of heat. Hence, the elements may be thermally coupled. In embodiments, thermal contact can be achieved by physical contact. In embodiments, thermal contact may be achieved via a thermally conductive material, such as a thermally conductive glue (or thermally conductive adhesive). Thermal contact may also be achieved between two elements when the two elements are arranged relative to each other at a distance of equal to or less than about 10 µm, though larger distances, such as up to 100 µm may be possible. The shorter the distance, the better the thermal contact. Especially, the distance may be 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. For instance, the two elements may be in physical contact at one or more, such as a plurality of positions, but at one or more, especially a plurality of other positions, the elements are not in physical contact. For instance, this may be the case when one or both elements have a rough surface. Hence, in embodiments in average the distance between the two elements may be 10 µm or less (though larger average distances may be possible, such as up to 100 µm). In embodiments, a side of the luminescent body may be in thermal contact with a sapphire layer, such as a sapphire body. Such layer may be transmissive for the first device light, second device light, and luminescent material light. The sapphire layer may further provide thermal contact with the thermally conductive body. Hence, the sapphire layer may be in thermal contact with the luminescent body and with the thermally conductive body. 2023PF80177 28 Further, in embodiments, the thermally conductive body may comprise a light transmissive section. Here, a light transmissive section may refer to an opening starting at one side of the thermally conductive body and ending an another (especially opposite) side. The light transmissive section may be an opening in the thermally conductive body. Hence, in embodiments the light transmissive section may be comprised by the recess, especially the through hole. In specific embodiments, the light transmissive section may be defined by a pinhole. Hence, in such embodiment, the light transmissive section may be defined by an opening (i.e. absence of solid matter). In other embodiments, the light transmissive section may be defined by a (light transmissive) window, such a ceramic window, or a sapphire window, or other window of light transmissive material, especially light transparent material. In embodiments, the light transmissive window may comprises a light transmissive ceramic or sapphire. Other light transmissive materials may also be possible, like polymers, glasses, etc. The use of a light transmissive window may also allow prevention of physical contact of the first side of the luminescent body with the thermally conductive body. Especially, the light transmissive section may thus be configured at the first side of the luminescent body. Hence, in embodiments first device light propagating to the luminescent body may first propagate through at least part of the light transmissive section, such as through an opening (like a pin-hole) or a light transmissive window. Hence, in specific embodiments, the light transmissive section may comprise one or more of (a) a pinhole, wherein part of the first side is configured in thermal contact with the thermally conductive body (through the pinhole), and (b) a light transmissive window, wherein the light transmissive window is configured downstream from the first light generating device and upstream of the luminescent body; wherein the light transmissive window comprises a light transmissive ceramic or sapphire. Especially, in embodiments, the light transmissive section may be regarded as a “tunnel” through the thermally conductive body. Further, in embodiments, the light transmissive section may have an equivalent circular diameter D. The equivalent circular diameter (or ECD) (or “circular equivalent diameter”) of an (irregularly shaped) two- dimensional shape is the diameter of a circle of equivalent area. For instance, the equivalent circular diameter of a square with side a is 2a / SQRT(π). For a circle, the diameter D is the same as the equivalent circular diameter D. Would a circle in an xy-plane with a diameter D be distorted to any other shape (in the xy-plane), without changing the area size, then the equivalent circular diameter of that shape would be D. In embodiments, the equivalent 2023PF80177 29 circular diameter D of the light transmissive section may, at least at one side of the thermally conductive body, be selected from the range of 10-2000 µm, such as 20-1000 µm, especially 50-500 µm. Further, in embodiments, the luminescent body may comprise an equivalent circular diameter (D1), wherein D ≤ 0.2*D1, such as D ≤ 0.1*D1, especially D ≤ 0.05*D1. As the light transmissive section may have a (relatively) small equivalent circular diameter D, the light transmissive section may, in embodiments, function as a pinhole. Hence, in specific embodiments, the light transmissive section may be a pinhole. In such embodiments, the light transmissive section may especially be circular. Yet, in embodiments, the light transmissive section may comprise a pinhole. A pinhole may be a small hole used in optical applications (e.g. photography, microscopy) to limit the amount of light transmitted through the hole. Hence, in embodiments, the light transmissive section, especially the pinhole, may be configured to block the transmission of luminescent material light via the first side. In specific embodiments, the light transmissive section may thus comprise a pinhole, and part of the first side may be configured in thermal contact with the thermally conductive body. Further, in embodiments, the light transmissive section, especially the pinhole, may be comprised by (a side of) the recess. In embodiments, the thermally conductive body may be configured such, that a (first) side of the luminescent body may face a side of the thermally conductive body, especially the recess, comprising the light transmissive section, especially the pinhole. Further, in embodiments, the light transmissive section may be configured downstream of a light generating device (especially the first light generating device) and upstream of a side of the luminescent body. Additionally, in embodiments, the pinhole and the recess may be configured such that device light, especially first device light, may enter the recess via the pinhole. Thus, in specific embodiments, the first side of the luminescent body may be configured in a light receiving relationship with the first light generating device via the light transmissive section, i.e. the first device light may pass through the light transmissive section before irradiating (the first side of) the luminescent body. Hence, in embodiments downstream of the first light generating device a light transmissive section comprising a light transmissive material may be configured, and downstream thereof the luminescent body. In specific embodiments downstream of the first light generating device a light transmissive section comprising a light transmissive material may be configured, and downstream thereof a first dichroic mirror may be configured, and downstream thereof the luminescent body. Especially, in further embodiments the 2023PF80177 30 luminescent body may at least partly be configured in a recess in the thermally conductive body. Yet, in embodiments downstream of the first light generating device a light transmissive section comprising an opening may be configured, and downstream thereof the luminescent body. In specific embodiments downstream of the first light generating device a light transmissive section comprising an opening may be configured, and downstream thereof a first dichroic mirror may be configured, and downstream thereof the luminescent body. Especially, in further embodiments the luminescent body may at least partly be configured in a recess in the thermally conductive body. Yet, in further embodiments downstream of the first light generating device a light transmissive section comprising a pinhole may be configured, and downstream thereof the luminescent body. In specific embodiments downstream of the first light generating device a light transmissive section comprising a pinhole may be configured, and downstream thereof a first dichroic mirror may be configured, and downstream thereof the luminescent body. Especially, in further embodiments the luminescent body may at least partly be configured in a recess in the thermally conductive body. In embodiments, the luminescent body may, after absorption of first device light and / or second device light, emit luminescent material light in all directions. In embodiments, at least part of the luminescent material light may be reflected by the sides of the recess. Yet, in embodiments, some of the luminescent material light may be emitted through the light transmissive section, especially through the pinhole. In embodiments, such a configuration may lower the optical power output of the light generating system. Thus, in embodiments, it may be desired to (even further) reduce luminescent material light emission from especially the first side. Hence, in embodiments, the light generating system may comprise a (first) dichroic mirror, configured relative to the first light generating device upstream of (the first side of) the luminescent body. In specific embodiments, the first dichroic mirror may be configured parallel to, and in physical contact with, the first side of the luminescent body. Further, in embodiments, the first dichroic mirror may be at least partially configured in the recess, such as (essentially) fully. Specifically, in embodiments, the first dichroic mirror may be at least partially configured between the light transmissive section, especially the pinhole, and the luminescent body, wherein both the first dichroic mirror and the luminescent body may be at least partially configured in the recess. Hence, in embodiments, the first dichroic mirror may be configured, relative to the first light generating device, downstream of the pinhole and upstream of the luminescent body. As such, first 2023PF80177 31 device light may pass through the pinhole and the first dichroic mirror before being incident on (the first side of the) the luminescent body. Further, in specific embodiments, the light transmissive section may comprise the pinhole; wherein the pinhole and the recess may be configured such that first device light may enter the recess via the pinhole; wherein the first dichroic mirror may be configured in the recess, and configured relative to the first light generating device downstream of the pinhole and upstream of the luminescent body. Such a configuration may prevent emission of luminescent material light through the pinhole. Additionally, such an arrangement of thermally conductive body, first dichroic mirror, and luminescent body may provide a stable configuration of the first dichroic mirror and the luminescent body within the recess. Further, with such a configuration, good (physical) contact may be facilitated between the first dichroic mirror and the luminescent body, thereby decreasing the amount of luminescent material light emitted by the first side. In embodiments, a dichroic mirror may be an optical element configured to transmit light within a first wavelength range, and reflect light within a second wavelength range. Specifically, in a first wavelength range, transmission of light (by the dichroic mirror) may be higher than reflection of light, while in a second wavelength range, reflection of light may be higher than transmission of light. Further, a dichroic mirror may have a cut-off and / or a cut-on wavelength, separating the two wavelength ranges. The cut-off wavelength may especially separate a transmissive range (shorter wavelengths) from a reflective range (longer wavelengths), while the cut-on wavelength may especially separate a reflective range (shorter wavelengths) from a transmissive range (longer wavelengths). Especially, a dichroic mirror may be configured to (a) transmit or reflect at least part of the device light, and (b) to reflect or transmit at least part of the luminescent material light. Thus, the light generating device, especially the light source, and the luminescent material may be selected such that the peak wavelength (λp) of the device light and the centroid wavelength (λc) of the luminescent material light are spectrally positioned at two opposite sides of a cut-on / cut-off wavelength of a dichroic mirror configured between the light generating device and the luminescent body. Hence, the peak wavelength (λp) of the device light and the centroid wavelength (λc) of the luminescent material light may be selected such, that the dichroic mirror may spectrally substantially separate them, and essentially transmit one and essentially reflect the other. In specific embodiments, the first dichroic mirror may be configured to transmit at least 70%, such as at least 80%, especially at least 90%, including (essentially) all 2023PF80177 32 of the (first) device light received by the first dichroic mirror. Further, in specific embodiments, the first dichroic mirror may be configured to reflect at least 70%, such as at least 80%, especially at least 90%, including (essentially) all of the luminescent material light received by the first dichroic mirror. Note that when the first dichroic mirror may be configured to transmit at least part of the device light, it may also be configured to reflect at least part of the luminescent material light. Thus, in embodiments, the first dichroic mirror may be configured to have a higher transmission for the first device light than for the luminescent material light. Further, in embodiments, the first dichroic mirror may be configured to have a higher reflection for the luminescent material light than for the first device light. As indicated, with such a configuration, luminescent material light emitted from the first side may be reflected back to the luminescent body, and subsequently emitted from the second side. This may increase the optical power output of the light generating system. Additionally, this may prevent luminescent material light from being incident on the first light generating device, thereby increasing the lifetime of the first light generating device. Further, with such a configuration, first device light may be provided to the luminescent body, wherein the first device light may have (essentially) equal intensity upstream and downstream of the dichroic mirror. Herein, 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 especially the light source and / or the luminescent body), 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 luminescent material light (that emanates from the second side of the luminescent body) may be directed towards the light exit of the light generating system, to provide system light comprising luminescent material light. To this end, in embodiments optics may be applied. Further, in embodiments, the luminescent material light may be combined with light from additional sources, to provide system light with a specific color and / or intensity. Also to this end, optics may be applied. Such embodiments are discussed here. In embodiments, the light generating system may comprise a second dichroic mirror. In embodiments, the second dichroic mirror may be identical to the first dichroic mirror. Yet, in embodiments, the second dichroic mirror may be different from the first dichroic mirror. For example, the second dichroic mirror may have a different cut-off and / or 2023PF80177 33 cut-on wavelength than the first dichroic mirror. In embodiments, the second dichroic mirror may be configured, relative to the second light generating device, downstream of said second light generating device. Further, the second dichroic mirror may be configured, relative to the second light generating device, upstream of the luminescent body. Further yet, in embodiments, the second dichroic mirror may be configured at an angle with respect to a side of the luminescent body. Especially, in embodiments, the second dichroic mirror may be configured at a (second dichroic) angle selected from the range of 10-80°, such as 20-70°, especially 30-60°, more especially 40-50° with respect to the second side (of the luminescent body). In specific embodiments, the second dichroic mirror may be configured at a (second dichroic) angle of 45° with respect to the second side. Further, in embodiments, the second dichroic mirror may be configured to reflect or transmit at least part of the second device light. Further yet, the second dichroic mirror may be configured to transmit or reflect at least part of the luminescent material light. In specific embodiments, the second dichroic mirror may thus be configured to reflect at least part of the second device light and to transmit at least part of the luminescent material light. In other embodiments, the second dichroic mirror may be configured to transmit at least part of the second device light and to reflect at least part of the luminescent material light. Specifically, the second dichroic mirror may be configured to (a) transmit or reflect at least 70%, such as at least 80%, especially at least 90%, including (essentially) all of the (second) device light, and (b) reflect or transmit at least 70%, such as at least 80%, especially at least 90%, including (essentially) all of the luminescent material light received by the second dichroic mirror. Hence, in specific embodiments, the light generating system may further comprise a second dichroic mirror, configured relative to the second light generating device downstream of the second light generating device and upstream of the luminescent body; wherein the second dichroic mirror may be configured (i) to reflect at least part of the second device light and to transmit at least part of the luminescent material light, or (ii) to transmit at least part of the second device light and to reflect at least part of the luminescent material light. Hence, when the second dichroic mirror reflects relatively more second device light than luminescent material light, it may transmit relatively more luminescent material light than second device light. Therefore, at least part of the light emanating from the second side from the luminescent body may have the second dichroic mirror in its optical path to a light exit of the light generating system. In embodiments wherein the second dichroic mirror may be configured to reflect at least part of the second device light, and transmit at least part of the luminescent 2023PF80177 34 material light, the second (irradiation) angle (α2) between the (luminescent body) axis A1and the second optical axis O2may be selected from the range of 0-10°, and the (second optical path) angle (β2) between a (first) part of the second optical axis (O2) extending from the second light generating device, and a (second) part of the second optical axis (O1) intersecting the luminescent body may be selected from the range of 60-90°. Further, in embodiments wherein the second dichroic mirror may be configured to transmit at least part of the second device light, and reflect at least part of the luminescent material light, the second angle (α2) may be selected from the range of 0-30°, and the angle (β2) may be selected from the range of 0-15°. This may have as advantage that, during operation of the light generating system, any device light reflected and / or transmitted by the luminescent body may be directed in a separate direction than the luminescent material light provided by the luminescent body. Such a light generating system may therefore prevent (second) device light from being directly emitted from the light exit of the light generating system upon damage to one or more of the luminescent body and the second dichroic mirror. Similar as described above in relation to the first device light, the second device light may be fully absorbed or partially absorbed. When it is fully absorbed, blue light for white system light may be provided by remaining first device light, luminescent body bypassed first device light, luminescent body reflected second device light, bypassed second device light, or another source of blue light. In the following paragraphs, the options of essentially full absorption and luminescent body reflected second device light are shortly discussed. In embodiments, during propagation of the device light, especially the second device light, through the luminescent body, the optical power of the second device light may be decreased due to absorption of the second device light by the luminescent body. The rate at which the optical power of the second device light is reduced may depend on the second peak wavelength (λp2) and / or the luminescent material comprised by the luminescent body. Especially, in embodiments, the rate at which the optical power of the second device light is reduced may depend on the absorption strength of the luminescent material (comprised by the luminescent body) at the second peak wavelength (λp2), the concentration of luminescent material in the luminescent body, and the height of the luminescent body. As such, in embodiments, the concentration and absorption strength (at the second peak wavelength (λp2)) of the luminescent material may define a second absorption height (H2a) of the luminescent body. The second absorption height (H2a) may especially be the distance the second device light would need to travel within a luminescent body to allow absorption of at 2023PF80177 35 least 98% of the second device light at the second peak wavelength (λp2) (assuming propagation parallel to an optical axis of the second device light, and especially assuming perpendicular irradiation with the second device light). Hence, the second absorption height (H2a) may especially be the distance the second device light would need to travel within a luminescent body to allow transmission of at maximum 2% of the second device light at the second peak wavelength (λp2) (assuming propagation parallel to an optical axis of the second device light, and especially assuming perpendicular irradiation with the second device light). In embodiments, the second absorption height (H2a) may be roughly equal to the twice second height (H1), as second device light may be reflected back (at the first dichroic mirror). Thus, in embodiments, 0.7*H1 ≤ 0.5*H2a ≤ H1, such as 0.8*H1 ≤ 0.5*H2a ≤ H1, especially 0.9*H1≤ 0.5*H2a≤ H1. In such embodiments, the second height (H1) may be selected such that, upon irradiation of the luminescent body with second device light, ≤ 10%, such as ≤ 5%, more especially ≤ 2% of the second device light may be transmitted through the luminescent body (without being converted into (second) luminescent material light). Hence, in specific embodiments, the luminescent body may have a first height (H1) as defined herein; wherein the second peak wavelength (λp2) and the luminescent body may be selected such that at least 98% of the second device light at the second peak wavelength (λp2) is absorbed over a second absorption height (H2a) of the luminescent body, wherein 0.5*H2a ≤ H1, especially wherein 0.9*H1 ≤ 0.5*H2a ≤ H1. Further, in embodiments the luminescent body may have a first height (H1), wherein the second peak wavelength (λp2) and the luminescent body may be selected such that at maximum 2% of the second device light at the second peak wavelength (λp2) is transmitted over a second absorption height H2a of the luminescent body, wherein 0.5*H2a ≤ H1, especially wherein 0.9*H1≤ 0.5*H2a≤ H1. In embodiments, it may be advantageous that (essentially) no second device light is transmitted through the luminescent body, such as ≤ 1%, especially ≤ 0.1%. As such, radiation damage to the second light generating device may be reduced or essentially prevented. Further, such a configuration may prevent (unconverted) second device light and / or second device light from escaping the light generating system, thereby preventing damage to the system and / or consumers. Thus, in embodiments, the first height (H1) may especially be (substantially) larger than half the second absorption height (H2a) of the luminescent body, 1.5*H2a ≤ 0.5*H1 ≤ 10*H2a, such as 2*H2a ≤ 0.5*H1 ≤ 8*H2a, especially 3*H2a ≤ 0.5*H1 ≤ 6*H2a. Further, in specific embodiments, the second peak wavelength (λp2) and the luminescent body may be selected such, that 3*H2a ≤ 0.5*H1 ≤ 6*H2a. 2023PF80177 36 Hence, when H1is substantially larger than 0.5*H2a, essentially no second device light may be transmitted through the luminescent body. Therefore, in (such) embodiments, the system light may essentially not comprise second device light. Hence, in embodiments essentially no second device light irradiating the second side may (after reflection) escape from the second side; i.e. “full conversion”. In yet other embodiments, it may be desired that at least part of the second device light is not absorbed by the luminescent body, and propagates together with the luminescent material light to the external of the system. Especially, in such embodiments a second dichroic mirror may not be applied and especially essentially all first device light may be absorbed. For instance, in such embodiments H1 ≤ 0.5*H2a ≤ 5*H1, such as 1.2*H1 ≤ 0.5*H2a≤ 4*H1, especially 1.5*H1≤ 0.5*H2a≤ 4*H1. Hence, when 0.5*H2ais (substantially) larger than H1 then second device light will (after reflection) emanate from the luminescent body. Therefore, in (such) embodiments, the system light may comprise second device light (if not (optically) filtered out). Hence, in embodiments second device light irradiating the second side may (after reflection) escape from the second side; i.e. “partial conversion”. Alternatively, second device light may end up in the system light when irradiation the luminescent body under an angle, i.e. the axis (A1) may have a second angle (α2) with the second optical axis (O2) unequal to 0°. Specifically, the luminescent body may be configured in a reflective mode with regard to the second device light. The luminescent body may be configured in a transmissive mode with regard to the first device light. Further, in specific embodiments, in a first operational mode of the light generating system, at least part of the luminescent material light generated by the first device light and at least part of the luminescent material generated by the second device light may emanate from the second side. Herein, the term “reflective mode” may indicate that when (second) device light is reflected at the luminescent body, it may have a direction overlapping with the direction in which the luminescent material light escapes from the system. Herein, the term “transmissive mode” may indicate that when at least part of the (first) device light is propagating in the same direction to the luminescent body as it was propagating to the luminescent body directly upstream of the luminescent body, it may have a direction overlapping with the direction in which the luminescent material light escapes from the system. In embodiments, a second light transmissive section, especially comprising a (second) light transmissive window, may be configured at the second side. 2023PF80177 37 Hence, in the current invention the luminescent body may be (simultaneously) configured in the reflective mode (relative to the second light generating device) and in the transmissive mode (relative to the first light generating device). In the transmissive mode, the absorption strength of the luminescent body at the peak wavelength (λp) of the incident device light may be high, and the (blue) (first) device may essentially be fully converted into (e.g. green and / or yellow) luminescent material light, which may emanate from the second side of the luminescent body. Further, in the reflective mode, the absorption strength of the luminescent body at the peak wavelength (λp) of the incident device light may be lower, and the absorption of (second) device light may be distributed over a longer optical path length by reflecting at the dichroic mirror (or other reflector) the (unconverted) (second) device light back into the luminescent body at the (first) side of the luminescent body. In such embodiments, thermal management may be easier, as the absorption and conversion of light may be spread over a larger optical path length within the luminescent body, thus distributing the correspondingly generated heat over a larger volume within the luminescent body. However, as indicated above, in embodiment the spectral power distribution of the first device light and second device light may also be essentially the same, implying that the (wavelength dependent) absorption strength for the first device light and the second device light are essentially the same. Further, a combination of transmissive mode and reflective mode may allow for reduced photo-quenching within the luminescent body at a similar optical power density of the (combined) device light, by spreading the absorption and conversion of (especially second) device light over a larger optical path length. Here, the transmissive mode may also be referred to as a “transmission mode”, and the reflective mode may be referred to as a “reflection mode”. Above, mainly embodiments of the light generating system were discussed wherein the light generating system comprises a first light generating device and a second light generating device. However, as indicated herein, in embodiments, the light generating system may comprise multiple, such as a plurality of light generating devices. Such embodiments will be discussed in more detail below. In embodiments, the light generating system may comprise a laser bank. Specifically, one or more first light generating devices, especially a plurality of first light generating devices, may be configured in a laser bank (or “a laser block”), i.e., the first light generating devices may comprise laser diodes. Additionally or alternatively, one or more second light generating devices, especially a plurality of second light generating devices may 2023PF80177 38 be configured in a laser bank, i.e., the second light generating devices may comprise laser diodes. The laser banks may be different laser banks, though a configuration in the same laser bank may also be possible. In embodiments, laser banks (or “laser blocks”) may (thus) be applied in the light generating system. Laser banks may also be used to boast the input power. Therefore, in embodiments, the light generating system may comprise a plurality of light generating devices configured to generate device light, wherein two or more of the light generating devices may comprise laser light sources configured in a laser bank. Hence, in specific embodiments, the light generating system may comprise a laser bank, wherein the laser bank may comprise one or more of (i) a plurality of first light generating devices, and (ii) a plurality of second light generating devices. Further, in specific embodiments, the light generating system may comprise one or more laser banks, wherein each of the one or more laser banks may comprise one or more of (i) a plurality of first light generating devices, and (ii) a plurality of second light generating devices. The laser bank may in embodiments comprise heat sinking and / or one or more optical elements (e.g. a lens to collimate the device light). Further, in embodiments, light generating devices in a laser bank may share the same optics. Hence, the use of a laser bank may have as advantage that the light generating system may require fewer (separate) optical elements and heat sinks. As such, the system may be more modular and robust. Additionally or alternatively, in embodiments, the light generating system may comprise a plurality of light generating devices. In embodiments, the plurality of light generating devices may comprise the first light generating device. A plurality of light generating devices providing the first light generating device may in embodiments be a (first) laser bank comprising a plurality of laser diodes (configured to generate the first device light). Yet, in further embodiments, the plurality of light generating devices may comprise the second light generating device. A plurality of light generating devices providing the second light generating device may in embodiments be a (second) laser bank comprising a plurality of laser diodes (configured to generate the second device light). Specifically, in embodiments, the light generating system may comprise a plurality of light generating devices comprising the first light generating device and the second light generating device. In such embodiments, the plurality of light generating devices may be configured to generate device light. Here, the device light may comprise one or more of the first device light and the second device light, such as especially both the first device light and the second device light. 2023PF80177 39 In embodiments, the light generating system may be configured to generate system light comprising (e.g. yellow) luminescent material light. Yet, it may be beneficial to generate system light comprising luminescent material light and a blue component, to create white system light. Such white system light may be obtained from incomplete absorption of first device light, as indicated above. Yet, in such embodiments, the first device light may pass through the luminescent body, potentially leading to undesired scattering and / or heat generation. Therefore, in embodiments, the system may be configured such that part of the device light bypasses the luminescent body. The part of the device light that bypasses the luminescent body may be referred to as third light. In embodiments, the third light may be equal to the device light. Yet, alternatively, in embodiments, the third light may pass through one or more optical elements to generate third light that is different from the device light. For example, the third light may pass through a diffuser element (see below) to generate diffused third light, wherein the diffused third light may especially comprise diffused blue light. Further, in embodiments, the (diffused) third light may be mixed with the luminescent material light in the light generating system, wherein the combined luminescent material light and third light may be comprised by the system light. Thus, the light generating system may be configured to generate, in a first operational mode of the light generating system, system light comprising luminescent material light and third light. Hence, in specific embodiments, the system light may comprise diffused blue light. Color schemes other than blue-yellow may also be possible, like blue-green-red, blue-yellow-red, blue-green-yellow-red, etc., including optional additions of cyan and / or orange. Especially, at least yellow and / or green light may be provided by one or more luminescent materials. Further, in specific embodiments, the light generating system may comprise a plurality of light generating devices comprising the first light generating device and the second light generating device, wherein the plurality of light generating devices are configured to generate device light; wherein the system is configured such that part of the device light bypasses the luminescent body to provide third light; wherein the light generating system is configured to generate in a first operational mode of the light generating system light comprising luminescent material light and third light. As indicated, such a configuration may allow control over the spectral power distribution of the system light. Especially, in embodiments, such a configuration may allow control over the correlated color temperature (CCT) of the system light, for example by adjusting the amount of device light that bypasses the luminescent body. Further, as indicated, the third light may be (separately) altered by one or more optical elements, to further increase the flexibility of the system in 2023PF80177 40 terms of system light properties. Hence, in specific embodiments, the invention may provide a laser-phosphor high-brightness light source using said phosphor in a transmission mode and a reflection mode mitigating photo-quenching and / or allowing CCT control. In embodiments, the light generating system may comprise one or more optical elements (see also above). The one or more optical elements, may, in embodiments, comprise one or more of a dichroic beam splitter, a polarizing beam splitter, a semi- transparent mirror, a reflective mirror, and one or more lenses. Further, in embodiments, the light generating system may comprise a diffuser element. In embodiments, a dichroic beam splitter may be the same as the first dichroic mirror and / or the second dichroic mirror. Yet, in embodiments, the dichroic beam splitter may be different from the first dichroic mirror and / or the second dichroic mirror, e.g., the dichroic beam splitter may have a different cut-off and / or cut-on wavelength. Further, in embodiments, a polarizing beam splitter may be configured to transmit and / or reflect at least part of the incident light in dependence of its polarization. Specifically, in embodiments, a polarizing beam splitter may be configured to (a) transmit or reflect at least 70%, such as at least 80%, especially at least 90%, including (essentially) all of the incoming light with p-polarization, and (b) reflect or transmit at least 70%, such as at least 80%, especially at least 90%, including (essentially) all of the incoming light with s- polarization. Thus, a polarizing beam splitter may convert a single (unpolarized) light beam into two light beams with orthogonal polarizations. Further, in embodiments, a semi-transparent mirror may be configured to reflect part of the incoming light, and transmit the rest of the incoming light, regardless of wavelength and / or polarization. Specifically, a semi-transparent mirror may be configured to (1) transmit or reflect at least 50%, such as at least 60%, especially at least 70% of the incoming light, and (2) reflect or transmit at most 50%, such as at most 40%, especially at most 30% of the incoming light. In embodiments, a semi-transparent mirror may also be referred to as a “beam splitter”. In embodiments, a reflective mirror may be configured to reflect at least 70%, such as at least 80%, especially at least 90%, including (essentially) all of the incoming light, regardless of wavelength and / or polarization , while preserving the light properties (e.g. polarization). Further, the one or more optical elements may, in embodiments, comprise one or more lenses. In such embodiments, the one or more lenses may be configured to collimate, homogenize, focus, converge, diverge and / or refract incoming light. In embodiments, the one 2023PF80177 41 or more lenses may comprise a micro lens array and / or a Fresnel lens. Further, in embodiments, the light generating system may comprise a diffuser element. Herein, the term “diffuser element” may refer to an element that diffuses or scatters light, such that soft light may be transmitted and / or reflected. In embodiments, such a diffuser element may comprise a diffusing material, such as one or more selected from the group comprising a glass, a polymeric material, a fabric, and a gel. An example of a reflective diffuser element may be a metallic coated glass diffuser showing 95-98% reflectance. As also indicated above, the system may, in embodiments, comprise further optics. The term “optics” may especially refer to (one or more) optical elements. Hence, the terms “optics” and “optical elements” and “optical component” may refer to the same items. The optics may include one or more or mirrors, reflectors, collimators, lenses, prisms, diffusers, phase plates, polarizers, diffractive elements, gratings, dichroics, arrays of one or more of the afore-mentioned, etc. In embodiments, the optics may include one or more of beam expander optics and zoom lens optics. See further above for examples of optics. As indicated, in embodiments, the light generating system may comprise one or more optical elements. Specifically, the light generating system may comprise one or more first optical elements. The one or more first optical elements may especially comprise one or more of a dichroic beam splitter, a polarizing beam splitter, a semi-transparent mirror, a reflective mirror, and one or more lenses. Further, in embodiments, the one or more first optical elements may be configured to split the first device light into at least two parts. In such embodiments, a first part (of the first device light) may propagate to the luminescent body. Additionally, a second part (of the first device light) may bypass the luminescent body to provide at least part of the third light. In further embodiments, the one or more first optical elements may be configured to split the second device light into at least two parts. In such embodiments, a first part (of the second device light) may propagate to the luminescent body. Additionally, a second part (of the second device light) may bypass the luminescent body to provide at least part of the third light. Thus, in such embodiments, the one or more first optical elements may especially comprise one or more of a dichroic beam splitter, a polarizing beam splitter, or a semi-transparent mirror to split the first device light (or the second device light). Further, one or more lenses or a refractive mirror may be used to guide the second part (of the first device light and / or the second device light) to bypass the luminescent body, and optionally to shape the beam of the second part (of the first device light and / or the second device light). 2023PF80177 42 In embodiments, on a power basis, at least 50%, such as at least 60%, especially at least 70% of the first device light (or the second device light) may propagate to the luminescent body. Further, on a power basis, at most 95%, such as at most 90%, especially at most 80% of the first device light (or the second device light) may propagate to the luminescent body. Hence, in embodiments, on a power basis at least 5%, such as at least 10%, especially at least 20% of the first device light (or the second device light) may bypass the luminescent body. Further, on a power basis at most 50%, such as at most 40%, especially at most 30% of the first device light (or the second device light) may bypass the luminescent body. Device light that bypasses the luminescent body may be used in the system light as (blue) component. In other embodiments, however, essentially all first device light (or the second device light) may propagate to the luminescent body. In embodiments, the device light may be split on a power basis, such that both parts have an equal spectral power distribution, yet a part of the intensity of the parent device light. Alternatively, the device light may be split on a spectral power basis, such that both parts have a different spectral power distribution from the parent device light. For example, light with longer wavelengths (comprising a first percentage of the total power) may bypass the luminescent body, while light with shorter wavelengths (comprising the remainder of the total power) may propagate to the luminescent body. Additionally, in embodiments, the plurality of light generating devices may further comprise a third light generating device. The third light generating device may, in embodiments, be the same as one or more of the first light generating device and the second light generating device. Yet, in embodiments, the third light generating device may also be a different light generation device, such as a different type of light generating device, or the same type of light generating device with a different spectral power distribution. Further, the third light generating device may be configured to generate third device light. In embodiments, the third device light may be spectrally essentially equal to the first device light and / or the second device light. Yet, in embodiments, the third device light may be spectrally different from the first device light and the second device light. For example, the first device light and second device light may consist of blue light, and the third device light may consist of red light. In embodiments, the one or more first optical elements may be configured to guide at least part of the third device light to bypass the luminescent body to provide at least part of the third light. Hence, in embodiments, the one or more first optical elements may especially comprise one or more lenses or a refractive mirror to guide the at 2023PF80177 43 least part of the third device light to bypass the luminescent body, and to shape the beam of the at least part of the third device light. Hence, in specific embodiments, the light generating system may further comprise one or more first optical elements, wherein one or more of the following may apply: (a) the one or more first optical elements may be configured to split the first device light into at least two parts, wherein a first part is to propagate to the luminescent body and a second part is to bypass the luminescent body to provide at least part of the third light, (b) the one or more first optical elements may be configured to split the second device light into at least two parts, wherein a first part is to propagate to the luminescent body and a second part is to bypass the luminescent body to provide at least part of the third light, and (c), the plurality of light generating devices may further comprise a third light generating device, wherein the third light generating device may be configured to generate third device light, and wherein the one or more first optical elements may be configured to guide at least part of the third device light to bypass the luminescent body to provide at least part of the third light; wherein the one or more first optical elements may comprise one or more of a dichroic beam splitter, a polarizing beam splitter, a semi-transparent mirror, a reflective mirror, and one or more lenses. Such a system may allow further control over the brightness and spectral power distribution of the system light. For example, only a small (second) part of the first and / or second device light may bypass the luminescent body, thereby increasing the component of luminescent material light in the system light. Additionally, the third light generating device may be configured to further tune the color and / or intensity of the system light. In embodiments, the light generating system may further comprises a rotatable element, wherein the rotatable element may comprises the luminescent body. Especially, during operation of the light generating system in the first operational mode, the rotatable element may rotate, such that over time different parts of the luminescent body are irradiated by the device light. The rotatable element may be a phosphor wheel or phosphor cylinder. Further, the rotatable element may comprise a thermally conductive material. In specific embodiments, the rotatable element may comprise the thermally conductive body. The rotatable element may facilitate thermal management of the luminescent body and thus allow a higher intensity of the luminescent material light and / or a longer lifetime of the luminescent body. As indicated above, in specific embodiments the light generating system may further comprise a dichroic element, such as the first dichroic mirror and / or the second dichroic mirror, configured to transmit or reflect device light and configured to reflect or 2023PF80177 44 transmit the luminescent material light. The dichroic element may be an embodiment of a color separation element, such as described in US7070300, which is herein incorporated by reference. Especially, the color separation element may be selected from the group of a dichroic mirror, a dichroic cube, and a diffractive optical element. Optionally, the color separation element may be provided using a hologram. Especially, the dichroic element may be a dichroic mirror or reflector. Hence, in a light generating system comprising a source of light, like a light generating device (e.g. comprising a solid state light source) that emits light having a first wavelength range along a first optical path (or “beam path”), a wavelength converting element (such as a luminescent body) may be configured in the first optical path. Such wavelength converting element may in embodiments be physically separated from the source of light. Further, such wavelength converting element may be configured to convert at least part of the light having a first wavelength range into light having a second wavelength range along a second optical path. Especially, in embodiments a color separation element, especially a dichroic element, may be disposed between the source of light and the wavelength converting element. In embodiments, the color separation element may be configured to prevent essentially all of the light having the second wavelength range from being incident on the source of light. Hence, such color separation element may in embodiments be configured to (a) transmit at least part of the light having the first wavelength range and reflect at least part of the light having the second wavelength range, or (b) reflect at least part of the light having the first wavelength range and transmit at least part of the light having the second wavelength range. In embodiments, the first dichroic mirror may be configured to separate blue light from light with larger wavelengths, such as one or more selected from green light, yellow light, and red light. Alternatively or additionally, in embodiments, the second dichroic mirror may be configured to separate blue light from light with larger wavelengths, such as one or more selected from green light, yellow light, and red light. As indicated above, the brightness and / or spectral power distribution of the light generating system may be controlled and / or tuned. In embodiments, such tuning may be achieved by adjusting the power input / output of (any of) the light generating devices. Yet, in further embodiments, especially the spectral power distribution may be adjusted by changing the position and / or number of the (especially) first optical elements. For example, the first device light in the configuration above may be split using a first semi-transparent mirror configured to reflect 30% of the first device light to bypass the luminescent body. Then, upon 2023PF80177 45 receiving a signal from a control system, the first semi-transparent mirror may be moved out of the first device light beam, and be simultaneously replaced by a second semi-transparent mirror, configured to reflect 10% of the first device light to bypass the luminescent body. This may increase the component of luminescent material light in the system light, thus changing the spectral power distribution of the system light. Hence, in embodiments, the light generating system may comprise a control system. Specifically, in embodiments, the light generating system may further comprise a control system, wherein the control system may be configured to individually control the first device light generated by the first light generating device and second device light generated by the second light generating device. Further, in specific embodiments, the control system may be configured to control one or more of the color point, correlated color temperature, and color rendering index) of the system light. Hence, the control system may be configured to adapt a spectral power distribution of the system light. The terms “color point”, “correlated color temperature”, and “color rendering index” are known to a person skilled in the art. 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 iPhone, a tablet, etc.. The device is 2023PF80177 46 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. The system, or apparatus, or device may execute an action in a “mode” or “operation mode” or “mode of operation” or “operational mode”. The term “operational mode may also be indicated as “controlling mode”. Likewise, in a method an action or stage, or step may be executed in a “mode” or “operation mode” or “mode of operation” or “operational mode”. This does not exclude that the system, or apparatus, or device may also be adapted for providing another controlling mode, or a plurality of other controlling modes. Likewise, this may not exclude that before executing the mode and / or after executing the mode one or more other modes may be executed. However, in embodiments a control system may be available, that is adapted to provide at least the controlling mode. Would other modes be available, the choice of such modes may especially be executed via a user interface, though other options, like executing a mode in dependence of a sensor signal or a (time) scheme, may also be possible. The operation mode may in embodiments also refer to a system, or apparatus, or device, that can only operate in a single operation mode (i.e. “on”, without further tunability). Hence, in embodiments, the control system may control in dependence of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer. The term “timer” may refer to a clock and / or a predetermined time scheme. 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, 2023PF80177 47 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. Hence, in yet a further aspect, the invention 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.. The lamp or luminaire may especially 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 plurality of light generating devices, the thermally conductive body, the luminescent body, and the one or more first optical elements. Instead of the terms “lighting device” or “lighting system”, and similar terms, also the terms “light generating device” or “light generating system”, (and similar terms), may be applied. A lighting device or a lighting system may be configured to generate device light (or “lighting device light”) or system light (“or lighting system light”). The term “white light”, and similar terms, herein, is known to the person skilled in the art. It may especially relate to light having a correlated color temperature (CCT) between about 1800 K and 20000 K, such as between 2000 and 20000 K, especially 2700- 20000 K, for general lighting especially in the range of about 2000-7000 K, such as in the range of 2700 K and 6500 K. In embodiments, the color rendering index (CRI) of the white light may be at least 65. Yet further, in embodiments the correlated color temperature (CCT) is especially within about 15 SDCM (standard deviation of color matching) from the BBL 2023PF80177 48 (black body locus), especially within about 10 SDCM from the BBL, even more especially within about 5 SDCM from the BBL. 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. The terms “light” and “radiation” are herein interchangeably used, unless clear from the context that the term “light” only refers to visible light. The terms “light” and “radiation” may thus refer to UV radiation, visible light, and IR radiation. In specific embodiments, especially for lighting applications, the terms “light” and “radiation” refer to (at least) visible light. The terms “violet light” or “violet emission”, and similar terms, may especially relate to light having a wavelength in the range of about 380-440 nm. In specific embodiments, the violet light may have a centroid wavelength in the 380-440 nm range. The terms “blue light” or “blue emission”, and similar terms, may especially relate to light having a wavelength in the range of about 440-490 nm (including some violet and cyan hues). In specific embodiments, the blue light may have a centroid wavelength in the 440-490 nm range. The terms “green light” or “green emission”, and similar terms, may especially relate to light having a wavelength in the range of about 490-560 nm. In specific embodiments, the green light may have a centroid wavelength in the 490-560 nm range. The terms “yellow light” or “yellow emission”, and similar terms, may especially relate to light having a wavelength in the range of about 560-590 nm. In specific embodiments, the yellow light may have a centroid wavelength in the 560-590 nm range. The terms “orange light” or “orange emission”, and similar terms, may especially relate to light having a wavelength in the range of about 590-620 nm. In specific embodiments, the orange light may have a centroid wavelength in the 590-620 nm range. The terms “red light” or “red emission”, and similar terms, may especially relate to light having a wavelength in the range of about 620-750 nm. In specific embodiments, the red light may have a centroid wavelength in the 620-750 nm range. The terms “cyan light” or “cyan emission”, and similar terms, especially relate to light having a wavelength in the range of about 490-520 nm. In specific embodiments, the cyan light may have a centroid wavelength in the 490-520 nm range. The terms “amber light” or “amber emission”, and similar terms, may especially relate to light having a wavelength in the range of about 585-605 nm, such as about 590-600 nm. In specific embodiments, the amber light may have a centroid wavelength in the 585-605 nm range. The phrase “light having one or more wavelengths in a wavelength range” and similar phrases may especially 2023PF80177 49 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. 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. 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 schematically depicts an embodiment of the light generating system; Fig.2 schematically depicts embodiments of the first dichroic mirror (Fig.2a), the thermally conductive body (Fig.2b), and the luminescent body (Fig.2c); Fig.3 schematically depicts embodiments of the first device light and second device light; Fig.4 schematically depicts embodiments of the plurality of light generating devices; Fig.5 schematically depicts embodiments of the light generating system; and Fig.6 schematically depicts several embodiments of the lighting device. The schematic drawings are not necessarily to scale. DETAILED DESCRIPTION OF THE EMBODIMENTS Fig.1 schematically depicts an embodiment of the light generating system 1000 comprising a first light generating device 110, a second light generating device 120, a luminescent body 210, a first dichroic mirror 521, and a thermally conductive body 500. As depicted, the first light generating device 110 may be configured to generate first device light 111. The first device light 111 may have a first peak wavelength λp1 (see Fig.3). Further, the 2023PF80177 50 first device light 111 may have a first optical axis O1, defined as starting at the first light generating device 110 and having a direction determined by the propagation direction of the first device light 111 between the first light generating device 110 and the first optical element configured downstream of the first light generating device 110. Additionally, the first light generating device 110 may comprise a light source, such as especially a solid stage light source. In embodiments, a plurality of the first light generating devices 110 may be comprised by a laser bank 1100. Conversely, the second light generating device 120 may be configured to generate second device light 121. The second device light 121 may have a second peak wavelength λp2. Additionally, the second device light may have a second optical axis O2. In embodiments, the second light generating device 120 may comprise a light source, such as especially a solid state light source. In further embodiments, a plurality of the second light generating devices 120 may be comprised by a laser bank 1100. The solid state light sources (of the first light generating device 110 and the second light generating device 120) may be selected from the group consisting of laser diodes and superluminescent diodes. In specific embodiments, the light generating system 1000 may thus comprise a laser bank 1100. In such embodiments, the laser bank 1100 may comprise one or more of (i) a plurality of first light generating devices 110, and (ii) a plurality of second light generating devices 120. Further, in embodiments, the light generating system may comprise a plurality of light generating devices 100 comprising the first light generating device 110 and the second light generating device 120. In such embodiments, the plurality of light generating devices 100 may be configured to generate device light 101. Hence, in embodiments, the device light 101 may comprise one or more of the first device light 111 and the second device light 121. The luminescent body 210 may comprise a luminescent material 200. The luminescent material 200 may be configured to convert at least part of the first device light 111 received by the luminescent material 200 into luminescent material light 201. Further, the luminescent material 200 may be configured to convert at least part of the second device light 121 received by the luminescent material 200 into luminescent material light 201. In specific embodiments, the luminescent material may be configured to convert at least part of the second device light 121 received by the luminescent material 200 into second luminescent material light 201’, wherein the second luminescent material light 201’ may have a different spectral power distribution than the luminescent material light 201. Yet, the second luminescent material light 201’ may be equal to the luminescent material light 201. In embodiments, the luminescent body 210 may comprise a first side 211, a second side 212, and a third side 213 bridging the first side 211 and the second side 212. Further, the 2023PF80177 51 luminescent body 210 may comprise an axis A1, defined as an axis along which (on average) luminescent material light 201 propagates during operation of the light generating system 1000. Especially, the axis A1 may refer to the propagation direction of the luminescent material light 201 between the luminescent body 210 and the first optical element 610 configured downstream of the luminescent body 210. Further, the thermally conductive body 500 may comprise a thermally conductive material 503. Additionally, the thermally conductive body 500 may comprise a light transmissive section 501. In embodiments, the first side 211 of the luminescent body 210 may be configured in a light receiving relationship with the first light generating device 110 via the light transmissive section 501. In such embodiments, as depicted in Fig.1, the first light generating device 110 may be configured facing the first side 211. Specifically, in such embodiments, the first optical axis O1 may have a first angle α1 with the axis A1, wherein α1 may be selected from the range of 0-30°. Similarly, the second side 212 of the luminescent body 210 may be configured in a light receiving relationship with the second light generating device 120. The second light generating device 120 may in such cases be configured facing the second side 212, as depicted in Fig 1. In such embodiments, the second optical axis O2 may have a second angle α2 with the axis A1, wherein α2 may be selected from the range of 0-30°. Further, one or more of part of the first side 211 and at least part of the third side 213 may be configured in thermal contact with the thermally conductive body 500. Especially, at least 20% of the first side 211, and at least 60% of the third side 213, may be configured in thermal contact with the thermally conductive body 500. The first dichroic mirror 521 may be configured between the first light generating device 110 and the luminescent body 210. Especially, the first dichroic mirror may be configured, relative to the first light generating device 110, upstream of the luminescent body 210. In embodiments, the first dichroic mirror 521 may be configured to have (i) a higher transmission for the first device light 111 than for the luminescent material light 201, and (ii) a higher reflection for the luminescent material light 201 than for the first device light 111. In embodiments, the light generating system 1000 may comprise a second dichroic mirror 602, configured relative to the second light generating device 120 downstream of the second light generating device 120 and upstream of the luminescent body 210. The second dichroic mirror 602 may be configured (i) to reflect at least part of the second device light 121 and to transmit at least part of the luminescent material light 201, or (ii) to transmit at least part of the second device light 121 and to reflect at least part of the 2023PF80177 52 luminescent material light 201. Specifically, the second dichroic mirror 602 may be configured to (i) transmit or reflect at least 70%, such as at least 80%, especially at least 90%, including (essentially) all of the second device light 121, and (ii) reflect or transmit at least 70%, such as at least 80%, especially at least 90%, including (essentially) all of the luminescent material light 201 received by the second dichroic mirror 602. In the embodiment depicted in Fig.1, the second dichroic mirror 602 is configured to transmit at least part of the second device light 121 and to reflect at least part of the luminescent material light 201. In a first operational mode, the light generating system 1000 may be configured to generate system light 1001 comprising luminescent material light 201. The system light 1001, especially the luminescent material light 201, may be guided to the light exit 2000 of the light generating system 1000 via one or more first optical elements 610 (see below). Specifically, the luminescent material light 201 may be guided to one side, especially the second side 212, of the luminescent body 210 before being guided to the light exit 2000. Further, the light transmissive section 501 may comprise a pinhole 502. The pinhole 502 may be configured to reflect and / or block second device light 121 and / or luminescent material light 201 emitted from the first side 211. Hence, in specific embodiments, the invention may provide a light generating system 1000 comprising a first light generating device 110, a second light generating device 120, a luminescent body 210, a first dichroic mirror 521, a second dichroic mirror 602, and a thermally conductive body 500, wherein: (A) the first light generating device 110 is configured to generate first device light 111 having a first peak wavelength λp1; wherein the first light generating device 110 comprises a solid state light source; wherein the second light generating device 120 is configured to generate second device light 121 having a second peak wavelength λp2; wherein the second light generating device 120 comprises a solid state light source; wherein the solid state light sources are selected from the group consisting of laser diodes and superluminescent diodes; (B) the luminescent body 210 comprises a luminescent material 200; wherein the luminescent material 200 is configured to convert (i) at least part of the first device light 111 received by the luminescent material 200, and (ii) at least part of the second device light 121 received by the luminescent material 200, into luminescent material light 201; wherein the luminescent body 210 comprises a first side 211, a second side 212, and a third side 213 bridging the first side 211 and the second side 212; (C) the thermally conductive body 500 comprises a thermally conductive material 503 and comprises a light transmissive section 501; (D) the first side 211 of the luminescent body 210 is configured in a 2023PF80177 53 light receiving relationship with the first light generating device 110 via the light transmissive section 501; the second side 212 of the luminescent body 210 is configured in a light receiving relationship with the second light generating device 120; and one or more of part of the first side 211, part of the second side 212 and at least part of the third side 213 is configured in thermal contact with the thermally conductive body 500; © the first dichroic mirror 521 is configured between the first light generating device 110 and the luminescent body 210, wherein the first dichroic mirror 521 is configured to have (i) a higher transmission for the first device light 111 than for the luminescent material light 201 and (ii) a higher reflection for the luminescent material light 201 than for the first device light 111; (F) the second dichroic mirror 602 is configured relative to the second light generating device 120 downstream of the second light generating device 120 and upstream of the luminescent body 210; wherein the second dichroic mirror 602 is configured (i) to reflect at least part of the second device light 121 and to transmit at least part of the luminescent material light 201, or (ii) to transmit at least part of the second device light 121 and to reflect at least part of the luminescent material light 201; and (G) the light generating system 1000 is configured to generate in a first operational mode of the light generating system 1000 system light 1001 comprising luminescent material light 201 and wherein in the first operational mode at least part of the luminescent material light 201 generated by the first device light 111 and at least part of the luminescent material 201 generated by the second device light 121 emanates from the second side 212. Returning to configurations of the light generating system 1000, the luminescent body 210 may have a first height H1. Further, the thermally conductive body may comprise a recess 510. The recess 510 may be configured to host at least part of the luminescent body 210. Especially, over at least part of the first height H1, the luminescent body 210 may be configured in the recess 510. In such embodiments, at least part of the third side 213 may be configured in thermal contact with the thermally conductive body 500, especially via the recess 510. Further, as depicted in Fig.1, the luminescent body 210 may be fully configured in the recess 510, wherein further (essentially) all of the third side 213 is configured in thermal contact with the thermally conductive body 500. The thermally conductive body 500 may comprise walls which are reflective for one or more of the first device light 111, the second device light 121, and the luminescent material light 201. Especially, the walls of the thermally conductive body 500 in thermal contact with the luminescent body 210, such as especially the walls of the recess 510, may be reflective for one or more of the first device light 111, the second device light 121, and the luminescent 2023PF80177 54 material light 201, such as especially for all of the first device light 111, the second device light 121, and the luminescent material light 201. Additionally, especially in the configuration shown in Fig.1, it may be important that no first device light 111 is transmitted through the luminescent body 210, as such transmitted light may be incident on the second light generating device 120. Hence, the first device light 111 and the luminescent body 210, especially the concentration and a maximum absorption wavelength λex of the luminescent material 200 comprised by the luminescent body 210, may be selected such, that (essentially) no first device light 111 may be transmitted through the luminescent body 210. Especially, the first peak wavelength λp1and the luminescent body 210 may be selected such that at maximum 2% of the first device light 111 at the first peak wavelength λp1may be transmitted over a first absorption height H1a of the luminescent body 210. In such embodiments, 0.9*H1 ≤ H1a ≤ H1. Yet, as depicted in Fig.1, the first height H1 may also be several times larger than the first absorption height H1a. This may ensure that, even upon (partial) damage of the luminescent body 210, still no first device light 111 may be transmitted through the luminescent body 210. Thus, the first peak wavelength λp1 and the luminescent body 210 may be selected such, that 3*H1a ≤ H1 ≤ 6*H1a. In a first operational mode of the light generating system 1000, the first device light 111 may enter the recess 510 via the pinhole 502, before irradiating the luminescent body 210. Thus, in such embodiments, the light transmissive section 501 may comprise the pinhole 502. Further, in such embodiments as depicted in Fig.1, the pinhole 502 and the recess 510 may be configured such that first device light 111 enters the recess 510 via the pinhole 502. Additionally, the light generating system may be configured in the recess 510, and configured relative to the first light generating device 110 downstream of the pinhole 502 and upstream of the luminescent body 210. Said luminescent body 210, which may be physically separated from a laser light source (such as the first light generating device 110 and / or the second light generating device 120), has a first side 211, a second side 212, and a third side 213. At least one of these sides may be in contact with a heatsink (such as the thermally conductive body 500) for cooling, e.g., a side holding heatsink. At least part of said second side 212 and at least part of said first side 211 may not be covered by said heatsink such that (blue) first device light 111 having a first peak wavelength λp1 may pump the luminescent body 210 (e.g. a phosphor tile) from its first side 211 and (blue) second device light 121 having a second peak wavelength λp1 may pump the luminescent body 210 from its second side 212. Said luminescent body 2023PF80177 55 210 may at least partly convert said first (laser) device light 111 and second (laser) device light 121 into luminescent material light 201, wherein the luminescent material light 201 may be green-yellow (and red) light. In order to capture the luminescent material light 201 only from one side, said first side 211 of said phosphor tile (or luminescent body 210) may be covered by a first dichroic mirror 521 which may be (at least partly, but especially essentially) transparent for the first device light 111 but reflective for the luminescent material light 201 (“converted light”). Alternatively, or in addition, said first side 211 of said phosphor tile (or luminescent body 210) may be covered with a reflective pinhole 502 which may have heatsink functionality as well. In order to extract the luminescent material light 201, a color separation element may be disposed between the second light generating device 120 providing the second device light 121 and said luminescent body 210. Said color separation element, e.g. the second dichroic mirror 602, may be configured to prevent at least part of, but especially (essentially) all of the luminescent material light 201 from being incident on said second light generating device 120 providing said second device light 121. Optionally, one or more (first) optical elements 610, such as one or more lenses, may be used to focus second (laser) device light 121 onto said second side 212 of said luminescent body 210 and to capture and collimate said luminescent material light 201. In similar vein, suitable (first) optical elements 610 such as one or more lenses may also be used to focus first (laser) device light 111 onto said first side 211 of said luminescent body 210. In embodiments, the luminescent body 210 may not convert all of the incoming first device light 111 and / or second device light 121 into luminescent material light 201. In such cases, the first device light 111 may be partially transmitted through the luminescent body 210, i.e. the luminescent body 210 may be configured in a transmissive mode with regard to the first device light 111. The second device light 121 may be reflected by the first dichroic mirror 521 and / or the pinhole 502 at the first side 211, and may subsequently exit the luminescent body 210 via the same side (i.e. the second side 212) as where the second device light 121 entered the luminescent body 210, i.e. the luminescent body 210 may be configured in a reflective mode with regard to the second device light 121. Herein, the term “reflective mode” may further indicate that when (second) device light is reflected at the luminescent body, it may have a direction overlapping with the direction in which the luminescent material light escapes from the system. Herein, the term “transmissive mode” may further indicate that when (first) device light is propagating in the same direction in the luminescent body as it was propagating to the luminescent body directly upstream of the luminescent body, it may have a direction overlapping with the direction in which the 2023PF80177 56 luminescent material light escapes from the system. Hence, the light transmissive section 501 may comprise the pinhole 502. Additionally, in a first operational mode, at least part of the first device light 111 and at least part of the second device light 121 may emanate from the second side 212. Further, said luminescent body 210 may be configured such that more blue laser light (i.e. first device light 111 and second device light 121) may be transmitted through said luminescent body 210 in the transmissive mode than collected from the reflective mode. The reason is that the path length in the reflective mode may be twice the path length in the transmissive mode. Alternatively, or in addition, λp1≠λp2, especially λp1may be closer to the maximum absorption wavelength λexof the luminescent material than λp2. In this architecture, said first dichroic mirror 521 may be reflective for the second device light 121 and transparent for the first device light 111. A control system 300 may be used for individually controlling said first device light 111 and second device light 121. These configurations may allow CCT control. Hence, the light generating system 1000 may comprise a control system 300. The control system 300 may be configured to individually control the first device light 111 generated by the first light generating device 110 and second device light 121 generated by the second light generating device 120. Further, in specific embodiments, the control system 300 may be configured to control one or more of the color point, correlated color temperature, and color rendering index (CRI) of the system light 1001. Fig.2a schematically shows the first dichroic mirror 521 during a (first) operational mode of the light generating system 1000. As depicted, during operation, the first dichroic mirror 521 may be configured to transmit at least 70%, such as at least 80%, especially at least 90%, including (essentially) all of the first device light 111. Additionally, during operation, the first dichroic mirror 521 may be configured to reflect at least 70%, such as at least 80%, especially at least 90%, including (essentially) all of the luminescent material light 201 (and in specific embodiments the second luminescent material light 201’). Fig.2b schematically shows a cross-section of the thermally conductive body 510 comprising thermally conductive material 503, the light transmissive section 501, and the pinhole 502. The thermally conductive body 500 may further comprise reflective walls (see above). Further, the thermally conductive body 500 may comprise the recess 510. In embodiments, the recess 510 may be a through hole. In specific embodiments, this may be a cylindrical through hole or a cubic through hole, or a rectangular cuboid. In such embodiments, the through hole may have two openings, with a first opening at the second 2023PF80177 57 side 212 of the luminescent body 210 and a second opening at the first side 211 of the luminescent body 210, which openings may have essentially the same dimensions. Fig.2c schematically shows a cross section of the luminescent body 210 comprising the luminescent material 200, a first side 211, a second side 212, a third side 213, a first height H1, and a first absorption height H1a. Here, an embodiment is depicted wherein H1 = 1.5*H1a, yet this need not be the case. In embodiments, the luminescent material 200 may at least comprise a luminescent material of the type A3B5O12:Ce. Specifically, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc. In such embodiments, the device light (111,121) may comprise blue device light (111,121). In the embodiment shown here, the luminescent body 210 is configured in the transmissive mode for the first device light 111, and the reflective mode for the second device light 121. Further, both the first device light 111 and the second device light 121 are fully absorbed by the luminescent material 200 and converted into luminescent material light 201. Fig.3 schematically depicts the spectral power distributions of the first device light 111 and the second device light 121. As depicted on the left, the first device light 111 and the second device light 121 may have (essentially) identical spectral power distributions. Especially, the first peak wavelength λp1and the second peak wavelength λp2may be (essentially) identical. Further, in embodiments, the luminescent material 200 may have an absorption spectrum (dashed line), with a maximum absorption wavelength λex. In embodiments, the first peak wavelength λp1may differ from λexby a distance (in nm) of Δλm-1. Further, in embodiments, the second peak wavelength λp2may differ from λexby a distance (in nm) of Δλm-2. Additionally, as shown on the right, the first device light 111 and the second device light 121 may have different spectral power distributions. Especially, the first peak wavelength λp1and the second peak wavelength λp2may differ at least 5 nm, such as at least 10 nm, especially at least 20 nm. Further, the luminescent material 200 may have a higher absorption strength for one of the first device light 111 and the second device light 121 than for the other of the first device light 111 and the second device light 121. Especially, the luminescent material 200 may have a higher absorption strength at the first peak wavelength λp1 than at the second peak wavelength λp2, i.e., Δλm-1 may be smaller than Δλm-2. In Fig.3 on the right, Δλm-1is (essentially) 0, and the first peak wavelength λp1is equal to λex. Fig.4a schematically depicts an embodiment of the light generating system 1000 comprising a plurality of light generating devices 100 comprising the first light 2023PF80177 58 generating device 110 and the second light generating device 120. Here, the plurality of light generating devices 100 are configured to generate device light 101. Furthermore, the system may be configured such that part of the device light 101 bypasses the luminescent body 210 (not depicted) to provide third light 103. Especially, part of the device light 101 may bypass the luminescent body 210 through the use of one or more first optical elements 610 (see below). Hence, the light generating system 1000 may be configured to generate in a first operational mode of the light generating system 1000 system light 1001 comprising luminescent material light 201 and third light 103. Fig.4b shows a similar embodiments as Fig.4a, yet with different first optical elements 610. Here, as in Fig.4a, the rightmost light generating device may be either a first light generating device 110, a second light generating device 120, or a third light generating device 130 (see below). Fig.5a schematically depicts a further embodiment of the light generating system 1000, comprising the third light generating device 130. The third light generating device 130 may be identical to the first light generating device 110 and / or the second light generating device 120. Yet, the third light generating device 130 may also be different from the first light generating device 110 and / or the second light generating device 120. Here, the third light generating device 130 is configured to generate third device light 131. Yet, the third light generating device 130 may also be configured to generate third light 103, or the third light 103 may (essentially) consist of the third device light 131. Further, the light generating system 1000 as depicted here comprises a third dichroic mirror 603, configured to (i) reflect at least 70%, such as at least 80%, especially at least 90%, including (essentially) all of the third device light 131 (or the third light 103), and (ii) transmit at least 70%, such as at least 80%, especially at least 90%, including (essentially) all of the luminescent material light 201. Hence, the system light 1001 may in this embodiment comprise third light 103 (or third device light 131) and luminescent material light 201. Further, the first light generating device 110 may be configured perpendicular to the first face 211. In such embodiments, the first optical axis O1may have an angle β1between a (first) part of the first optical axis O1extending from the first light generating device 110, and a (second) part of the first optical axis O1 intersecting the luminescent body 210. In embodiments, the angle β1may be selected from the range of 60-90°. Further, in embodiments as depicted in Fig.1, the angle β1 may be selected from the range of 0-15°. Similarly, the second light generating device 120 may be configured perpendicular to the second face 212. In such embodiments, the second optical axis O2 may have an angle β2 2023PF80177 59 between a (first) part of the second optical axis O2extending from the second light generating device 120, and a (second) part of the second optical axis O2intersecting the luminescent body 210. In embodiments, the angle β2 may be selected from the range of 60-90°. Further, in embodiments as depicted in Fig.1, the angle β2 may be selected from the range of 0-15°. Further, Fig.5a shows an embodiment of a lighting device 1200 (see below) comprising the light generating system 1000. Here, the light generating system 1000 may be especially safe in the event of breaking or loss of one or more of the first optical elements 610 (not depicted), the luminescent body 210, or the dichroic mirrors 602, 603. For example, the light exit 2000 of the light generating system 1000 may be configured outside of the first optical axis O1 and the second optical axis O2, such that the first device light 111 and the second device light 121 may never be directly transmitted to the light exit 2000. Further, for example, the third dichroic mirror 603 may be configured to reflect first device light 111 and second device light 121 away from the light exit 2000, in case of damage to the luminescent body 210. Finally, for example, the optical elements guiding the first device light 111 (or the second device light 121) to the luminescent body 210 may be reflective for the first device light 111 (or the second device light 121), yet transmissive for the second device light 121 (or the first device light 111). In this way, upon breaking of the luminescent body, the first device light 111 (or the second device light 121) may not be incident on the second light generating device 120 (or the first light generating device 110). Fig.5b schematically depicts another embodiment of light generating system further 1000 comprising one or more first optical elements 610. Here, one or more of the following may apply: (a) the one or more first optical elements 610 may be configured to split the first device light 111 into at least two parts, wherein a first part is to propagate to the luminescent body 210 and a second part is to bypass the luminescent body 210 to provide at least part of the third light 103, (b) the one or more first optical elements 610 may be configured to split the second device light 121 into at least two parts, wherein a first part is to propagate to the luminescent body 210 and a second part is to bypass the luminescent body 210 to provide at least part of the third light 103, and (c) the plurality of light generating devices 100 further comprise a third light generating device 130, wherein the third light generating device 130 may be configured to generate third device light 131, and wherein the one or more first optical elements 610 may be configured to guide at least part of the third device light 131 to bypass the luminescent body 210 to provide at least part of the third light 103. Further, the one or more first optical elements 610 may comprise one or more of a dichroic beam splitter, a polarizing beam splitter, a semi-transparent mirror, a reflective 2023PF80177 60 mirror, and one or more lenses. Especially, in Fig.5b, options (b) and (c) are depicted. Here, the second device light 121 (generated by the middle light generating device) is split into two parts by a first optical element 610 comprising a semi-transparent mirror to provide at least part of the third light 103, and to propagate to the luminescent body 210. Further, the device light 111, 121 or third device light 131 generated by the rightmost light generating device fully bypasses the luminescent body 210 to provide at least part of the third light 103. Here, the aforementioned light 111, 121, 131 may especially pass through a diffuser system to generate diffused light, such as especially diffused blue light. The diffuser system may comprise a polarization changing element 810, one or more condenser lenses 620, and a diffuser element 710. The polarization changing element 810 may, in embodiments, be configured in an optical path of the device light 101, 111, 121, 131 between the corresponding (plurality of) light generating device(s) 100, 110, 120, 130 and the diffuser element 710. In embodiments, the polarization changing element 810 may especially comprise one or more of a λ / 4 waveplate and a Faraday rotator. Further, in embodiments, the diffuser element 710 may be configured to diffuse (by reflection) at least part of the device light 101, 111, 121, 131 received by the diffuser element 710 thereby providing diffused device light 101, 111, 121, 131 (or at least part of the third light 103) while maintaining at least part of the polarization of the device light 101, 111, 121, 131. Hence, in embodiments, the diffuser element 710 may be operated in the reflective mode. Especially, the diffuser element 710 may be a polarization maintaining reflective diffuser element 710. Further, starting with linear p-polarized light, it is converted by the polarization changing element 810 into e.g. right-handed circular polarized light, which is converted by the polarization maintaining reflective diffuser element 710 into left-handed circular polarized light, which now is converted by the polarization changing element 810 into linear s-polarized light. Likewise, s-polarized light may be converted into diffused p- polarized light. Hence, device light 101, 111, 121, 131 may pass the polarization changing element 810 twice, one time propagating from a (plurality of) light generating device(s) 100, 110, 120, 130 to the diffuser element 710, while having a first polarization, and one time propagating from the diffuser element 710 to the light exit 2000 of the light generating system 1000, being diffused at the diffuser element 710 and obtaining a second polarization when passing the polarization changing element 810 (in the direction of the light exit 2000). An example of the operational mode of the diffuser system is as follows: 2023PF80177 61 Transmitted blue (p-polarized) device light 101, 111, 121, 131 may pass the polarization changing element 810 (e.g. a λ / 4 plate) and may be projected via condenser lenses 620 onto a preferably polarization maintaining diffuser 710, generating diffused blue device light 101, 111, 121, 131. The diffused blue device light 101, 111, 121, 131 may be collected by the condenser lenses 620 and may pass again the polarization changing element 810 (by which it becomes substantially s-polarized light). The diffuser system may especially be combined with a polarizing beam splitter 610 (comprised by the one or more first optical elements 610). Here, the polarizing beam splitter 610 may be configured to transmit light with a first polarization (corresponding to the polarization of the device light 101, 111, 121, 131), and to reflect light with an orthogonal polarization (corresponding to the polarization of the diffused device light 101, 111, 121, 131, or the third light 103). Hence, the light generating system 1000 may be configured such that, upon damage to the diffuser system, no directed (or “non-diffused”) light may be admixed with the system light 1001. Further, the diffused blue device light 101, 111, 121, 131 (or at least part of the third light 103) may be combined with the luminescent material light 201 to generate (white) system light 1001. Hence, the system light 1001 may comprise diffused blue light. Fig.5c schematically depicts an embodiment of the light generating system 1000 comprising a rotatable element 1400. The rotatable element 1400 may be a phosphor wheel or phosphor cylinder. Further, the rotatable element 1400 (shown in cross-section) may have a circular shape. Additionally, in the embodiment depicted, the luminescent body 210 may be ring-shaped, and may be configured on a face of rotatable element 1400. Especially, the luminescent body 210 may be in (thermal) contact with the rotatable element 1400 via the first side 211. In embodiments, the rotatable element 1400 may comprise a thermally conductive material. In specific embodiments, the rotatable element 1400 may comprise the thermally conductive body (not indicated in detail, but see e.g. Figs.1, 2b, 5a, 5b, and 5d). Further, in embodiments, the rotatable element 1400 may comprise the luminescent body 210. The rotatable element 1400 may, during operation of the light generating system 1000, be configured to rotate about an axis of rotation AR. Such rotation may provide the benefit that, over time, different parts of the luminescent body 210 may be irradiated by the device light 101,111,121. This may facilitate thermal management. Further, as depicted, the rotatable element 1400 may comprise the light transmissive section 501, elsewhere also indicated with reference 910. Especially, the light transmissive section 501 may be configured in (thermal) contact with the first side 211 of the luminescent body 210. 2023PF80177 62 Fig.5d schematically depicts a further embodiment of the light generating system 1000. Here, the light transmissive section 501 comprises a light transmissive window 910, configured downstream from the first light generating device 110 and upstream of the luminescent body 210. In embodiments, the light transmissive window 910 may comprise a light transmissive ceramic or sapphire. Further, in embodiments, a (first) side 211 of the luminescent body 210 may be in thermal contact with the light transmissive window 910. The light transmissive window 910 may be transmissive for the first device light 111, second device light 121, and luminescent material light 201. The light transmissive window 910 may further provide thermal contact with the thermally conductive body 500. Here, the light transmissive window 910 may be in thermal contact with the luminescent body 210 (via the first side 211) and with the thermally conductive body 500 (via the recess 510). Fig.5e schematically depicts an embodiment of the thermally conductive body 500 comprising the light transmissive window 910. Here, the light generating system 1000 (such as the recess 510 of the thermally conductive body 500) further comprises a second light transmissive section 920, such as a second light transmissive window, configured on the second side 212 of the luminescent body 210. Hence, relative to the first light generating device 110, the second light transmissive section 920 is configured downstream of the luminescent body 210. Optionally, the first dichroic mirror 521 (indicated with a dashed line) may be configured between the luminescent body 210 and the light transmissive window 910. Especially, relative to the first light generating device 110, the first dichroic mirror 521 may be configured downstream of the light transmissive window 910, and upstream of the luminescent body 210 and the second light transmissive section 920. In embodiments, the second light transmissive section 920 may comprise a second light transmissive window, wherein the second light transmissive window may comprise a light transmissive ceramic or sapphire. Fig.6 schematically depicts several embodiments of the lighting device 1200 comprising the light generating system as defined herein. Hence, Fig.6 schematically depicts an embodiment of a luminaire 2 comprising the lighting device 1200 (and the light generating system 1000). 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.6 also schematically depicts an embodiment of lamp 1 comprising the light generating system 1000. Reference 3 indicates a projector device or projector system, which may be used to project images, such as at a wall, which may also comprise the light generating system 1000. Hence, Fig.6 schematically depicts embodiments of a lighting 2023PF80177 63 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 lighting device, or an optical wireless communication device. Lighting device light escaping from the lighting device 1200 is indicated with reference 1201. Lighting device light 1201 may essentially consist of system light 1001, and may in specific embodiments thus be system light 1001. Reference 1300 refers to a space, such as a room. Reference 1305 refers to a floor and reference 1310 to a ceiling; reference 1307 refers to a wall. The term “plurality” refers to two or more. The terms “substantially” or “essentially” herein, and similar terms, will be understood by the person skilled in the art. The terms “substantially” or “essentially” may also include embodiments with “entirely”, “completely”, “all”, etc. Hence, in embodiments the adjective substantially or essentially may also be removed. Where applicable, the term “substantially” or the term “essentially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%. The term “comprise” also includes embodiments wherein the term “comprises” means “consists of”. The term “and / or” especially relates to one or more of the items mentioned before and after “and / or”. For instance, a phrase “item 1 and / or item 2” and similar phrases may relate to one or more of item 1 and item 2. The term "comprising" may in an embodiment refer to "consisting of" but may in another embodiment also refer to "containing at least the defined species and optionally one or more other species". Use of the verb "to comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein. 2023PF80177 64 The devices, apparatus, or systems may herein amongst others be described during operation. As will be clear to the person skilled in the art, the invention is not limited to methods of operation, or devices, apparatus, or systems in operation. It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a device claim, or an apparatus claim, or a system claim, enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. In yet a further aspect, the invention (thus) provides a software product, which, when running on a computer is capable of bringing about (one or more embodiments of) the method as described herein. The invention also provides a control system that may control the device, apparatus, or system, or that may execute the herein described method or process. Yet further, the invention also provides a computer program product, when running on a computer which is functionally coupled to or comprised by the device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system. The invention further applies to a device, apparatus, or system comprising one or more of the characterizing features described in the description and / or shown in the attached drawings. The invention further pertains to a method or process comprising one or more of the characterizing features described in the description and / or shown in the attached drawings. The various aspects discussed in this patent can be combined in order to provide additional advantages. Further, the person skilled in the art will understand that embodiments can be combined, and that also more than two embodiments can be combined. Furthermore, some of the features can form the basis for one or more divisional applications.

Claims

2023PF80177 65 CLAIMS:

1. A light generating system (1000) comprising a first light generating device (110), a second light generating device (120), a luminescent body (210), a first dichroic mirror (521), a second dichroic mirror (602), and a thermally conductive body (500), wherein: - the first light generating device (110) is configured to generate first device light (111) having a first peak wavelength (λp1); wherein the first light generating device (110) comprises a solid state light source; wherein the second light generating device (120) is configured to generate second device light (121) having a second peak wavelength (λp2); wherein the second light generating device (120) comprises a solid state light source; wherein the solid state light sources are selected from the group consisting of laser diodes and superluminescent diodes; wherein the first peak wavelength (λp1) and the second peak wavelength (λp2) are selected from the range of 430-490 nm; - the luminescent body (210) comprises a luminescent material (200); wherein the luminescent material (200) is configured to convert (i) at least part of the first device light (111) received by the luminescent material (200), and (ii) at least part of the second device light (121) received by the luminescent material (200), into luminescent material light (201); wherein the luminescent body (210) comprises a first side (211), a second side (212), and a third side (213) bridging the first side (211) and the second side (212); - the thermally conductive body (500) comprises a thermally conductive material (503) and comprises a light transmissive section (501); - the first side (211) of the luminescent body (210) is configured in a light receiving relationship with the first light generating device (110) via the light transmissive section (501); the second side (212) of the luminescent body (210) is configured in a light receiving relationship with the second light generating device (120); and one or more of part of the first side (211), part of the second side (212), and at least part of the third side (213) is configured in thermal contact with the thermally conductive body (500); - the first dichroic mirror (521) is configured between the first light generating device (110) and the luminescent body (210), wherein the first dichroic mirror (521) is configured to have (i) a higher transmission for the first device light (111) than for the2023PF80177 66 luminescent material light (201) and (ii) a higher reflection for the luminescent material light (201) than for the first device light (111); - the second dichroic mirror (602) is configured relative to the second light generating device (120) downstream of the second light generating device (120) and upstream of the luminescent body (210); wherein the second dichroic mirror (602) is configured (i) to reflect at least part of the second device light (121) and to transmit at least part of the luminescent material light (201) or (ii) to transmit at least part of the second device light (121) and to reflect at least part of the luminescent material light (201); and - the light generating system (1000) is configured to generate in a first operational mode of the light generating system (1000) system light (1001) comprising luminescent material light (201) and wherein in the first operational mode at least part of the luminescent material light (201) generated by the first device light (111) and at least part of the luminescent material light (201) generated by the second device light (121) emanates from the second side (212).

2. The light generating system (1000) according to claim 1, wherein the light transmissive section (501) comprises one or more of (a) a pinhole (502), wherein part of the first side (211) is configured in thermal contact with the thermally conductive body (500), and (b) a light transmissive window (910), wherein the light transmissive window (910) is configured downstream from the first light generating device (110) and upstream of the luminescent body (210); wherein the light transmissive window (910) comprises a light transmissive ceramic or sapphire.

3. The light generating system (1000) according to any one of the preceding claims, wherein the luminescent body (210) has a first height (H1); wherein the thermally conductive body (500) comprises a recess (510) configured to host at least part of the luminescent body (210), such that over at least part of the first height (H1) the luminescent body (210) is configured in the recess (510); wherein at least part of the third side (213) is configured in thermal contact with the thermally conductive body (500).

4. The light generating system (1000) according to claims 2-3, wherein the pinhole (502) and the recess (510) are configured such that first device light (111) enters the recess (510) via the pinhole (502); wherein the first dichroic mirror (521) is configured in the2023PF80177 67 recess (510), and configured relative to the first light generating device (110) downstream of the pinhole (502) and upstream of the luminescent body (210).

5. The light generating system (1000) according to any one of the preceding claims, wherein one of the following applies: (a) the first peak wavelength (λp1) and the second peak wavelength (λp2) differ at least 10 nm, and wherein the luminescent material (200) has a higher absorption strength at the first peak wavelength (λp1) than at the second peak wavelength (λp2), and (b) the first peak wavelength (λp1) and the second peak wavelength (λp2) differ at maximum 5 nm.

6. The light generating system (1000) according to any one of the preceding claims, wherein the luminescent body (210) has a first height (H1) as defined in claim 3; wherein the first peak wavelength (λp1) and the luminescent body (210) are selected such that at maximum 2% of the first device light (111) at the first peak wavelength (λp1) is transmitted over a first absorption height (H1a) of the luminescent body (210), wherein 0.9*H1 ≤ H1a ≤ H1.

7. The light generating system (1000) according to claim 6, wherein the first peak wavelength (λp1) and the luminescent body (210) are selected such, that 3*H1a ≤ H1 ≤ 6*H1a.

8. The light generating system (1000) according to any one of the preceding claims, comprising a plurality of light generating devices (100) comprising the first light generating device (110) and the second light generating device (120), wherein the plurality of light generating devices (100) are configured to generate device light (101); wherein the system is configured such that part of the device light (101) bypasses the luminescent body (210) to provide third light (103); wherein the light generating system (1000) is configured to generate in an operational mode of the light generating system (1000) system light (1001) comprising luminescent material light (201) and third light (103).

9. The light generating system (1000) according any one of the preceding claims, comprising one or more laser banks (1100), wherein each of the one or more the laser banks comprises one or more of (i) a plurality of first light generating devices (110), and (ii) a plurality of second light generating devices (120).2023PF80177 68 10. The light generating system (1000) according to claims 8-9, further comprising one or more first optical elements (610), and wherein one or more of the following applies: - the one or more first optical elements (610) are configured to split the first device light (111) into at least two parts, wherein a first part is to propagate to the luminescent body (210) and a second part is to bypass the luminescent body (210) to provide at least part of the third light (103); - the one or more first optical elements (610) are configured to split the second device light (121) into at least two parts, wherein a first part is to propagate to the luminescent body (210) and a second part is to bypass the luminescent body (210) to provide at least part of the third light (103); and - the plurality of light generating devices (100) further comprise a third light generating device (130), wherein the third light generating device (130) is configured to generate third device light (131), and wherein the one or more first optical elements (610) are configured to guide at least part of the third device light (131) to bypass the luminescent body (210) to provide at least part of the third light (103); wherein the one or more first optical elements (610) comprise one or more of a dichroic beam splitter, a polarizing beam splitter, a semi-transparent mirror, a reflective mirror, and one or more lenses.

11. The light generating system (1000) according to any one of the preceding claims 8-10, wherein the system light (1001) comprises diffused blue light.

12. The light generating system (1000) according any one of the preceding claims, wherein the luminescent material (200) at least comprises a luminescent material of the type A3B5O12:Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc; wherein the device light (111,121) comprises blue device light (111,121); and wherein the light generating system (1000) further comprises a rotatable element (1400), wherein the rotatable element (1400) comprises the luminescent body (210); wherein during operation of the light generating system (1000) in the first operational mode the rotatable element (1400) rotates, such that over time different parts of the luminescent body (210) are irradiated by the device light (101).2023PF80177 69 13. The light generating system (1000) according any one of the preceding claims 10-13, further comprising a control system (300), wherein the control system (300) is configured to individually control the first device light (111) generated by the first light generating device (110) and second device light (121) generated by the second light generating device (120).

14. The light generating system (1000) according to claim 13, wherein the control system (300) is configured to control one or more of the color point, correlated color temperature, and color rendering index of the system light (1001).

15. A lighting device (1200) selected from the group consisting of a lamp (1), a luminaire (2), a projector device (3), a disinfection device, a photochemical reactor, an automotive lighting device, and an optical wireless communication device, comprising the light generating system (1000) according to any one of the preceding claims.

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