CCT control using laser banks by splitting bank light in different portions for focusing laser light on phosphors and a diffuser

Abstract

The invention provides a light generating system (1000), configured to generate system light (1001), wherein the light generating system (1000) comprises a first light generating arrangement (2000), a second light generating arrangement (3000), a first luminescent material (210), a second luminescent material (220), a diffuser arrangement (710), a control system (300), and optics (500). In embodiments, the optics (500) comprise a first beam divider (TR1), a second beam divider (TR2), a first beam combiner arrangement (C1), a second beam combiner arrangement (C2), a third beam combiner arrangement (C3), and a main beam combiner arrangement (590). The control system (300) is configured to control the spectral power distribution of the system light (1001) by controlling the first light generating arrangement (2000) and the second light generating arrangement (3000).

Description

[0001] CCT CONTROL USING LASER BANKS BY SPLITTING BANK LIGHT IN DIFFERENT PORTIONS FOR FOCUSING LASER LIGHT ON PHOSPHORS AND A DIFFUSER

[0002] FIELD OF THE INVENTION

[0003] The invention relates to a light generating system. The invention further relates to a lighting device comprising the light generating system.

[0004] BACKGROUND OF THE INVENTION

[0005] Laser light sources are known in the art. For instance, US2018316160A1 describes a device and method for an integrated white colored electromagnetic radiation source using a combination of laser diode excitation sources based on gallium and nitrogen containing materials and light emitting source based on phosphor materials. A violet, blue, or other wavelength laser diode source based on gallium and nitrogen materials may be closely integrated with phosphor materials, such as yellow phosphors, to form a compact, high- brightness, and highly-efficient, white light source.

[0006] SUMMARY OF THE INVENTION

[0007] High brightness light sources can be used in various applications including spots, projection, stage-lighting, headlamps, home and office lighting, entertainment lighting, and automotive lighting. For this purpose, laser-phosphor technology can be used, wherein a laser provides laser light and a remote phosphor converts laser light into converted light. A relatively straightforward way to produce white light using lasers is to use (blue) laser light in combination with a (yellow) phosphor to generate phosphor converted light. Laser-phosphor systems may allow generation of high brightness light and may therefore be used in projection systems, including displays such as cinema projectors and projectors for home, school, and office applications, car front lighting, search lighting, stage lighting, architectural lighting, and special lighting applications. However, such laser-phosphor systems may be capable to generate only a single color point, and / or only light of a specific correlated color temperature (CCT), as defined by the phosphor. Creation of a product range providing different color points and / or CCTs may be difficult as it may require multiple unique components to be designed, qualified, produced, and kept in stock. In other cases, e.g. in RGB-based laser(-phosphor) systems, the maximum brightness may be limited by the components used, the engine volume may be large due to the many components, and the system cost may be high due to the many dedicated components. 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 the above-described drawbacks. The present invention may have as object to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.

[0008] According to a first aspect, the invention provides a light generating system (“system”) configured to generate system light. The light generating system may comprise a first light generating arrangement and one or more further light generating arrangements. Especially, the light generating system may comprise (at least) a first light generating arrangement and a second light generating arrangement (and optionally yet one or more further light generating arrangements). Further, the light generating system may comprise (one or more of) a first luminescent material, a second luminescent material, a diffuser arrangement, a control system, and optics. The optics may in embodiments comprise a first beam divider, a second beam divider (, and a third reflector). Further, in embodiments the optics may comprise a first beam combiner arrangement, a second beam combiner arrangement, and a third beam combiner arrangement. Further yet, the optics may comprise a main beam combiner arrangement. In embodiments, the first light generating arrangement may be configured to generate first light generating arrangement light. Especially, the first light generating arrangement may comprise one or more first solid state light sources. The one or more first solid state light sources may in embodiments especially be selected from the group of solid state lasers and superluminescent diodes. In embodiments, the first light generating arrangement and the optics may be configured to provide (one or more of) (i) via the first beam divider and the first beam combiner arrangement a first part of the first light generating arrangement light to the first luminescent material, (ii) via the second beam divider and the second beam combiner arrangement a second part of the first light generating arrangement light to the second luminescent material, and (iii) via (the third reflector and) the third beam combiner arrangement a third part of the first light generating arrangement light to the diffuser arrangement. In embodiments, a ratio of radiant fluxes of the first part of the first light generating arrangement light, the second part of the first light generating arrangement light, and the third part of the first light generating arrangement light may be fixed. Hence, the first light generating arrangement and the optics may be configured to provide via the first beam divider and the second beam divider, in a fixed ratio, portions of first light generating arrangement light via the beam combiner arrangements to the first luminescent material, the second luminescent material, and the diffuser arrangement (respectively). Further, the first light generating arrangement and the optics may be configured such that (i) one of the beam dividers (especially the second beam divider) may be configured upstream of two of the three beam combiner arrangements, and (ii) another one of the beam dividers (especially the first beam divider) may be configured upstream of all three beam combiner arrangements. Turning to the second (or a further) light generating arrangement, the second (or a further) light generating arrangement may be configured to generate second (or a further) light generating arrangement light. The second (or a further) light generating arrangement may in embodiments comprise one or more second (or further) solid state light sources. In embodiments, the one or more second (or further) solid state light sources may especially be (individually) selected from the group of solid state lasers and superluminescent diodes. In embodiments, the second (or a further) light generating arrangements and the optics may be configured to provide second (or further) light generating arrangement light (also) via the beam combiner arrangements to one or more of the first luminescent material, the second luminescent material, and the diffuser arrangement (respectively). Especially, the second light generating arrangement and the optics may be configured to provide one or more of (i) via the first beam combiner arrangement a first part of the second light generating arrangement light to the first luminescent material, (ii) via the second beam combiner arrangement a second part of the second light generating arrangement light to the second luminescent material, and (iii) via the third beam combiner arrangement a third part of the second light generating arrangement light to the diffuser arrangement. In embodiments, the first luminescent material may be configured to convert at least part of (the first part of) the first light generating arrangement light received by the first luminescent material into first luminescent material light. Additionally or alternatively, the first luminescent material may be configured to convert at least part of (the first part of the) second light generating arrangement light received by the first luminescent material into first luminescent material light. Further, the first luminescent material may be configured to convert at least part of the light received from (a) the first light generating arrangement and / or (b) the second (or a further) light generating arrangements into first luminescent material light. Similarly, the second luminescent material may be configured to convert at least part of (the second part of) the first light generating arrangement light received by the second luminescent material into second luminescent material light. Additionally or alternatively, in embodiments, the second luminescent material may be configured to convert at least part of (the second part of) the second light generating arrangement light received by the second luminescent material into second luminescent material light. Further, the second luminescent material may be configured to convert at least part of the light received from (a) the first light generating arrangement and / or (b) the second (or a further) light generating arrangements into second luminescent material light. Additionally or alternatively, in embodiments, the diffuser arrangement may be configured to diffuse (a) at least part of (the third part of) the first light generating arrangement light received by the diffuser arrangement, and (b) at least part of (the third part of) the second light generating arrangement light received by the diffuser arrangement into diffused light. Further, the diffuser arrangement may be configured to diffuse at least part of the light received from (a) the first light generating arrangement and / or (b) the second (or a further) light generating arrangements into diffused light. In embodiments, the main beam combiner arrangement may be configured downstream of the first luminescent material, the second luminescent material, and the diffuser arrangement. Further, the main beam combiner arrangement may be configured to provide a beam of system light comprising one or more of the first luminescent material light, the second luminescent material light, and the diffused light. Hence, the system light may comprise one or more of the first luminescent material light, the second luminescent material light, and the diffused light. Further, in embodiments, the system light may especially comprise one or more of (i) a first (portion of) system light resulting only from the first light generating arrangement light, and (ii) a second (portion of) system light resulting only from the second light generating arrangement light. In embodiments, (at least one of) the first (portion of) system light (and the second (portion of) system light) may be white light. Further, in one or more operational modes of the light generating system, the second (portion of) system light may have a spectral power distribution different from a spectral power distribution of the first (portion of) system light. In embodiments, the control system may be configured to control the spectral power distribution of the system light by controlling the first light generating arrangement and the second (or a further) light generating arrangement(s). Hence, in specific embodiments, the invention provides a light generating system, configured to generate system light, wherein the light generating system comprises a first light generating arrangement, a second light generating arrangement, a first luminescent material, a second luminescent material, a diffuser arrangement, a control system, and optics; wherein: (A) the optics comprise a first beam divider, a second beam divider, a first beam combiner arrangement, a second beam combiner arrangement, a third beam combiner arrangement, and a main beam combiner arrangement; (B) the first light generating arrangement is configured to generate first light generating arrangement light; wherein the first light generating arrangement comprises one or more first solid state light sources; wherein the one or more first solid state light sources are selected from the group of solid state lasers and superluminescent diodes; (C) the first light generating arrangement and the optics are configured to provide (i) via the first beam divider and the first beam combiner arrangement a first part of the first light generating arrangement light to the first luminescent material, (ii) via the second beam divider and the second beam combiner arrangement a second part of the first light generating arrangement light to the second luminescent material, and (iii) via the third beam combiner arrangement a third part of the first light generating arrangement light to the diffuser arrangement, wherein a ratio of radiant fluxes of the first part of the first light generating arrangement light, the second part of the first light generating arrangement light, and the third part of the first light generating arrangement light is fixed; (D) the first light generating arrangement and the optics are configured such that (i) one of the beam dividers is configured upstream of two of the three beam combiner arrangements, and (ii) another one of the beam dividers is configured upstream of all three beam combiner arrangements; (E) the second light generating arrangement is configured to generate second light generating arrangement light; wherein the second light generating arrangement comprises one or more second solid state light sources; wherein the one or more second solid state light sources are selected from the group of solid state lasers and superluminescent diodes; (F) the second light generating arrangement and the optics are configured to provide one or more of (i) via the first beam combiner arrangement a first part of the second light generating arrangement light to the first luminescent material, (ii) via the second beam combiner arrangement a second part of the second light generating arrangement light to the second luminescent material, and (iii) via the third beam combiner arrangement a third part of the second light generating arrangement light to the diffuser arrangement; (G) the first luminescent material is configured to convert (a) at least part of the first light generating arrangement light received by the first luminescent material, and (b) at least part of second light generating arrangement light received by the first luminescent material into first luminescent material light; (H) the second luminescent material is configured to convert (a) at least part of the first light generating arrangement light received by the second luminescent material, and (b) at least part of the second light generating arrangement light received by the second luminescent material into second luminescent material light; (I) the diffuser arrangement is configured to diffuse (a) at least part of the first light generating arrangement light received by the diffuser arrangement, and (b) at least part of the second light generating arrangement light received by the diffuser arrangement into diffused light; (J) the main beam combiner arrangement is configured downstream of the first luminescent material, the second luminescent material, and the diffuser arrangement, and is configured to provide a beam of system light comprising one or more of the first luminescent material light, the second luminescent material light, and the diffused light; wherein the system light comprises one or more of (i) a first system light resulting only from the first light generating arrangement light, and (ii) a second system light resulting only from the second light generating arrangement light; wherein the first system light is white light, and wherein in one or more operational modes of the light generating system the second system light has a spectral power distribution different from a spectral power distribution of the first system light; and (K) the control system is configured to control the spectral power distribution of the system light by controlling the first light generating arrangement and the second light generating arrangement.

[0009] Hence, in an aspect, the invention may also provide a light generating system (“system”), configured to generate system light, wherein the light generating system comprises a first light generating arrangement, one or more further light generating arrangements, a first luminescent material, a second luminescent material, a diffuser arrangement, a control system, and optics. In embodiments, the optics may comprise a first beam divider, a second beam divider, a first beam combiner arrangement, a second beam combiner arrangement, and a third beam combiner arrangement. Especially, the first light generating arrangement may be configured to generate first light generating arrangement light. In embodiments, the first light generating arrangement may comprise one or more first solid state light sources. Further, in embodiments the one or more further light generating arrangements may be configured to generate one or more further light generating arrangement light. Especially, the one or more further light generating arrangements may each comprise one or more further solid state light sources. In embodiments, the first light generating arrangement and the optics may be configured to provide via the first beam divider and the second beam divider, in a fixed ratio, portions of first light generating arrangement light via the beam combiner arrangements to the first luminescent material, the second luminescent material, and the diffuser arrangement. Yet, in embodiments the one or more further light generating arrangements and the optics may be configured to provide one or more further light generating arrangement light via the beam combiner arrangements to one or more of the first luminescent material, the second luminescent material, and the diffuser arrangement. Especially (see also above), the first luminescent material may be configured to convert at least part of the light received from (a) the first light generating arrangement and / or (b) the one or more further light generating arrangements into first luminescent material light. Yet, in embodiments the second luminescent material may be configured to convert at least part of the light received from (a) the first light generating arrangement and / or (b) the one or more further light generating arrangements into second luminescent material light. Yet, in further embodiments the diffuser arrangement may be configured to diffuse at least part of the light received from (a) the first light generating arrangement and / or (b) one or more further light generating arrangements into diffused light. Especially, the system light may comprise one or more of the first luminescent material light, the second luminescent material light, and the diffused light. Further, especially the control system may be configured to control the spectral power distribution of the system light by controlling the first light generating arrangement and the one or more further light generating arrangements. Hence, in specific embodiments the invention provides a light generating system, configured to generate system light; wherein the light generating system comprises a first light generating arrangement, one or more further light generating arrangements, a first luminescent material, a second luminescent material, a diffuser arrangement, a control system, and optics; wherein: (A) the optics comprise a first beam divider, a second beam divider, a first beam combiner arrangement, a second beam combiner arrangement, and a third beam combiner arrangement. (B) the first light generating arrangement is configured to generate first light generating arrangement light; wherein the first light generating arrangement comprises one or more first solid state light sources; (C) the one or more further light generating arrangements are configured to generate one or more further light generating arrangement light; wherein the one or more further light generating arrangements each comprise one or more further solid state light sources; (D) the first light generating arrangement and the optics are configured to provide via the first beam divider and the second beam divider, in a fixed ratio, portions of first light generating arrangement light via the beam combiner arrangements to the first luminescent material, the second luminescent material, and the diffuser arrangement; (E) the one or more further light generating arrangements and the optics are configured to provide one or more further light generating arrangement light via the beam combiner arrangements to one or more of the first luminescent material, the second luminescent material, and the diffuser arrangement; (F) the first luminescent material is configured to convert at least part of the light received from (a) the first light generating arrangement and / or (b) the one or more further light generating arrangements into first luminescent material light; (G) the second luminescent material is configured to convert at least part of the light received from (a) the first light generating arrangement and / or (b) the one or more further light generating arrangements into second luminescent material light; (H) the diffuser arrangement is configured to diffuse at least part of the light received from (a) the first light generating arrangement and / or (b) one or more further light generating arrangements into diffused light; (I) the system light comprises one or more of the first luminescent material light, the second luminescent material light, and the diffused light; and (J) the control system is configured to control the spectral power distribution of the system light by controlling the first light generating arrangement and the one or more further light generating arrangements.

[0010] With such a system, the properties of the system light (e.g. the spectral power distribution and / or the CCT) may be tuned by controlling the first light generating arrangement and the second light generating arrangement. Especially, the contributions of the first (portion of) system light and the second (portion of) system light may be varied (gradually), facilitating (gradually) adjustable optical properties of the system light, rather than (just) a switch from the first system light to the second system light. Further, as the first light generating arrangement and the second light generating arrangement may share (at least) the same beam combiner arrangements, such a system may be relatively compact, and not require separate optics for the first light generating arrangement and the second light generating arrangement. Finally, by using a first luminescent material and a second luminescent material, the color rendering index (CRI) of the system light may be improved compared to laser-phosphor systems comprising (only) one luminescent material. Further, high intensity color (temperature) light may be provided.

[0011] Here below, some embodiments of the invention are discussed in further detail.

[0012] In embodiments, the light generating system may comprise a first light generating arrangement and a second light generating arrangement, comprising respectively one or more first solid state light sources and one or more second solid state light sources. Optionally, the light generating system may further comprise further light generating arrangements, which may (each) (optionally) comprise one or more further solid state light sources. The solid state light sources may (individually) be selected from solid state lasers and superluminescent diodes. Here below, the invention is especially described in relation to solid state lasers. The term “further light generating arrangement”, and similar terms, may refer in embodiments of the light generating system comprising the first light generating arrangement and the second light generating arrangement, to the optional third light generating arrangement and the optional fourth light generating arrangement, or may refer in embodiments of the light generating system comprising the first light generating arrangement to any of the second light generating arrangement, the optional third light generating arrangement, and the optional fourth light generating arrangement (of which the second light generating arrangement may anyhow be comprised by the light generating system and the third light generating arrangement and the fourth light generating arrangement may be optionally available (i.e. the third light generating arrangement or the third light generating arrangement and the fourth light generating arrangement may optionally be available).

[0013] In embodiments, the (first, second, and optionally further) light generating arrangements may (each) comprise a respective (first, second, and optionally further) laser banks (or “laser block”). That is, in embodiments, the one or more solid state light sources (of the respective light generating arrangements) may be arranged in a laser bank. Laser banks may be used to boast the input power. In embodiments, the laser bank may comprise a heat sinking element and / or lasing optics e.g. a lens to collimate the laser light. Hence, in embodiments, the (solid state) light source(s) in a laser bank (or “laser array bank”) may share the same optics. A laser bank may comprise a light emitting arrangement comprising an (2D) array of a plurality of laser diodes arranged on a thermally conductive carrier and a (lens array having a) plurality of collimator lenses corresponding to the laser diodes such that each laser diode of the plurality of laser diodes comprises a collimator lens for collimating laser light emitted by the laser diode. The arrangement may comprise a package architecture or a canned architecture. In case of the package architecture a laser diode chip array is arranged on the thermally conductive carrier. A plurality of electrodes may be present for electrically connecting the plurality of laser diodes.

[0014] Yet, in embodiments, one or more of the (first, second, and optionally further) light generating arrangements may comprise a single solid state light source, such as especially a laser light source. In (other) embodiments, one or more of the (first, second, and optionally further) light generating arrangements may comprise a plurality of solid state light sources, wherein the plurality of solid state light sources may be arranged in an array. Yet, especially, the (first, second, and optionally further) light generating arrangements may comprise a laser bank, wherein the one or more solid state light sources (of the respective light generating arrangements) may be arranged in the laser bank.

[0015] Herein, the term “light generating arrangement” may refer to one or more solid state light sources. The term “light generating arrangement” may also refer to a laser bank. Further, the term “light generating arrangement” may also refer to one or more solid state light sources in combination with optics. For instance, the light generating arrangement may in specific embodiments comprise a polarizing element, configured to impose a specific polarization on the light generated by the light generating arrangement.

[0016] In embodiments, the (one or more first solid state light sources of the) first light generating arrangement may be configured to generate first light generating arrangement light. Especially, the first light generating arrangement may comprise a first laser bank, wherein the first laser bank may be configured to generate the first light generating arrangement light. In embodiments, the first light generating arrangement light may have a first centroid wavelength ci. The term “centroid wavelength”, also indicated as c, 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 kc = X I(k) / (S I( X)), where the summation is over the wavelength range of interest, and I (A) 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. In embodiments, the first centroid wavelength ci may be selected from the range of 200-490 nm, such as from the range of 400-490 nm, especially from the range of 440-490 nm. Hence, in embodiments, the one or more first light sources may be configured to generate blue light (i.e., light having a (centroid) wavelength in the range of about 440-490 nm). Further, in embodiments, the first light generating arrangement light may have a first (linear) polarization. In embodiments, the first (linear) polarization may be selected from the group of s-polarization and p-polarization.

[0017] 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 indicate that the indicated light (or radiation) has a spectral power distribution with at least intensity or intensities at these one or more wavelengths in the indicate wavelength range. For instance, a blue emitting solid state light source will have a spectral power distribution with intensities at one or more wavelengths in the 440-490 nm wavelength range.

[0018] Similarly, in embodiments, the (one or more second solid state light sources of the) second light generating arrangement may be configured to generate second light generating arrangement light. Especially, the second light generating arrangement may comprise a second laser bank, wherein the second laser bank may be configured to generate the second light generating arrangement light. Hence, in specific embodiments, the first light generating arrangement may comprise a first laser bank configured to generate the first light generating arrangement light, and the second light generating arrangement may comprise a second laser bank configured to generate the second light generating arrangement light. As indicated, a laser banks may be used to boast the input power (of the one or more light source). Further, in embodiments, the (solid state) light source(s) in a laser bank may share the same optics, reducing the overall size of and number of components needed for the light generating system.

[0019] In embodiments, the second light generating arrangement light may have a second centroid wavelength Zc2. In embodiments, the second centroid wavelength Zc2 may be selected from the range of 200-490 nm, such as from the range of 400-490 nm, more especially from the range of 440-490 nm. Hence, in embodiments, the one or more second light sources may be configured to generate blue light. In embodiments, the second centroid wavelength Zc2 may be different from the first centroid wavelength ci, i.e., ci Xc2. Further, in embodiments, |Xci - Xc2| > 0 nm, such as |Xci - Xc2| > 5 nm, such as |Xci - Xc2| > 10 nm, especially |Xci - Xc2| > 15 nm. Additionally or alternatively, in embodiments, |Xci - AC2| < 65 nm, like |kci - Xc2| < 50 nm, such as |kci - Xc2| < 40 nm, especially |kci - Xc2| < 30 nm. Yet, in (other) embodiments, the second centroid wavelength Zc2 may be the same as the first centroid wavelength ci, i.e., ci = Xc2.

[0020] In embodiments, the second light generating arrangement light may (further) have a second (linear) polarization. In embodiments, the second (linear) polarization may be selected from the group of s-polarization and p-polarization. The second polarization may be the same as the first polarization. Alternatively, in embodiments, the second polarization may be different from the first polarization. That is, in embodiments, the first light generating arrangement light may have a different polarization than the second light generating arrangement light, wherein the first polarization may especially be orthogonal to the second polarization.

[0021] In embodiments, the first solid state light sources and / or the second solid state light sources may be configured to provide the polarized first light generating arrangement light and / or the second light generating arrangement light, respectively. Alternatively, the first and / or second light generating arrangements may (each) comprise a polarizer, wherein the polarizer may be configured to provide polarized light generating arrangement light. Hence, the (first and / or second) light generating arrangement may comprise a polarizer to impose a desired polarization on the light of the (first and / or second) solid state light sources (respectively) (see also above). Likewise, this may apply to optional one or more further light generating arrangements.

[0022] In embodiments, the first light generating arrangement light may be incident on (one or more of) the optics.

[0023] In embodiments, the optics may comprise a first beam divider. The first beam divider may in embodiments be configured to divide the (beam of) first light generating arrangement light into a first part of the first light generating arrangement light and a remainder part of the first light generating arrangement light (herein also referred to as the “propagating part”). Especially, in embodiments, the first beam divider may be configured to reflect the first part of the first light generating arrangement light (towards the first beam combiner arrangement) and transmit the (first) propagating part of the first light generating arrangement light. Especially, the first part and the (first) propagating part of the first light generating arrangement light may have the same spectral power distribution (and polarization). Hence, in embodiments, the first beam divider may especially divide the (beam of) first light generating arrangement light on the basis of radiant flux (or intensity) over the whole spectral power distribution of the first light generating arrangement light. That is, in embodiments, the first beam divider may be (both) a transparent and specular reflective mirror (or a semi-transparent semi-reflective (specular) mirror). In embodiments, the first beam divider may be configured to (i) reflect > 10%, such as > 20%, especially > 30%, of the first light generating arrangement light received by the first beam divider and (ii) transmit < 90%, such as < 80%, especially < 70%, of the first light generating arrangement light received by the first beam divider. Alternatively, in embodiments, the first beam divider may be configured to (i) reflect < 75%, such as < 70%, especially < 60%, of the first light generating arrangement light received by the first beam divider and (ii) transmit > 25%, such as > 30%, especially > 40%, of the first light generating arrangement light received by the first beam divider.

[0024] In embodiments, the propagating part of the first light generating may (after - in embodiments - being transmitted by the first beam divider) be incident on the second beam divider. In embodiments, at the second beam divider, a second part of the first light generating arrangement light may be reflected (especially towards the second beam combiner arrangement). Further, at the second beam divider, a second propagating part of the first light generating arrangement light (such as especially a third part of the first light generating arrangement light) may be transmitted (through the second beam divider). Hence, the second beam divider may be configured to (i) partially reflect first light generating arrangement light received by the second beam divider, and (ii) partially transmit first light generating arrangement light received by the second beam divider. Especially, the second beam divider may be configured to (i) reflect > 50%, such as > 60%, especially > 70%, of the first light generating arrangement light received by the second beam divider; and (ii) transmit < 50%, such as < 40%, especially < 30%, of the first light generating arrangement light received by the second beam divider. Alternatively, in embodiments, the second beam divider may be configured to (i) reflect < 95%, such as < 90%, especially < 85%, of the first light generating arrangement light received by the second beam divider; and (ii) transmit > 5%, such as > 10%, especially > 15%, of the first light generating arrangement light received by the second beam divider. Further, the second beam divider may be the same (type of) beam divider as the first beam divider. Especially, the second beam divider (and the first beam divider) may be configured to specularly reflect part of the light source light. That is, in embodiments, the first beam divider and the second beam divider may be semi-transparent semi-reflective specular mirrors. Especially, herein the term “semi-transparent semi-reflective specular mirror” may refer to an optical element that has specular properties and has transmissive properties, thereby providing the effect that part of the light (of a beam of light) received by the semi-transparent semi -reflective specular mirror is specularly reflected and part of the light (of the (same) beam of light) received by the semi-transparent semi -reflective specular mirror is transmitted. In this way, a beam of light can be divided in parts propagating in different directions. Hence, in specific embodiments, the first beam divider and the second beam divider may (both) be transparent specular reflective mirrors.

[0025] A transparent specular reflective mirrors may provide the benefit that the reflection and( / or) transmission coefficients of the mirrors may essentially be the same for each wavelength (of the light received (which may especially be blue light, see also below)). Further, a transparent specular reflective mirror may be configured to transmit at least part of the incident light, wherein e.g. at least 30%, like at least 40%, such as at least 50%, like over 50% of the transmitted light is essentially not scattered. Yet, such transparent specular reflective mirror may be configured to reflect at least part of the incident light, wherein e.g. at least 30%, like at least 40%, such as at least 50%, like over 50% of the reflected light, such as at least 60% of the reflected light, is specularly reflected. Here, the percentage refer to radiant fluxes.

[0026] Hence, in embodiments, the second part of the first light generating arrangement light may have the same spectral power distribution as the first part of the first light generating arrangement light (and the third part of the first light generating arrangement light).

[0027] In embodiments, the second propagating part (and / or the third part) of the first light generating arrangement light may (after - in embodiments - being transmitted by the second beam divider) be incident on a third reflector. Hence, the optics may comprise a third reflector. In embodiments, the third reflector may be configured downstream of both beam dividers (i.e., downstream of the first beam divider and the second beam divider). Further, in embodiments, the third reflector may be configured upstream of one selected from the (first, second, and third) beam combiner arrangement. Especially, in embodiments, the third reflector may be configured upstream of the third beam combiner arrangement.

[0028] 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 the especially the light generating arrangement(s)), 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”.

[0029] Hence, in specific embodiments, the optics may comprise a third reflector, wherein the third reflector may be configured (i) downstream of both beam dividers and (ii) upstream of one selected from the beam combiner arrangements. In embodiments, the second propagating part (and / or the third part) of the first light generating arrangement light may be reflected at the third reflector. Especially, the third reflector may reflect the second propagating part (and / or the third part) of the first light generating arrangement light towards the third beam combiner arrangement. In embodiments, the third reflector may be configured to reflect > 80%, such as > 90%, especially > 95%, like > 99%, including (essentially) 100%, of the (first light generating arrangement) light received by the third reflector. In embodiments, the third reflector may have as sole function to reflect the light received by the third reflector, and may thus be fully specularly reflective for the received light. Therefore, in embodiments, the light generating system, especially the optics, may (further) comprise one or more reflective mirrors, (configured between the beam dividers and the beam combiner arrangements and / or between the third reflector and the beam combiner arrangements, and) configured to guide the first, second, and third part of the first light generating arrangement light to the respective beam combiner arrangements. Especially, the term “reflective mirror” herein may refer to a specularly reflective mirror, unless otherwise indicated or clear from the context.

[0030] Especially, in embodiments, the first part of the first light generating arrangement light, the second part of the first light generating arrangement light, and the third part of the first light generating arrangement light may all have essentially the same spectral power distribution.

[0031] Herein, the term “optics” may refer to optical elements. The herein described reflective mirror(s), beam combiner(s), beam divider(s), main beam combiner arrangement, etc., are example of optical elements that may be comprised by the “optics” of the light generating system.

[0032] In embodiments, the first light generating arrangement may thus be configured to provide a first part of the first light generating arrangement light to the first beam combiner arrangement (via the first beam divider), a second part of the first light generating arrangement light to the second beam combiner arrangement (via the second beam divider), and a third part of the first light generating arrangement light to the third beam combiner arrangement (via the third reflector). Hence, in embodiments, one of the beam dividers (such as especially the second beam divider) may be configured upstream of two of the three beam combiner arrangements, and another one of the beam dividers (such as especially the first beam divider) may be configured upstream of all three beam combiner arrangements. In embodiments, the ratio (in radiant flux) between the first part, second part, and third part of the first light generating arrangement light may be fixed. That is, the first part of the first light generating arrangement light may (essentially always) have the same relative radiant flux compared to the second part of the first light generating arrangement light, and vice versa. Similarly, the second part of the first light generating arrangement light may (essentially always) have the same relative radiant flux compared to the third part of the first light generating arrangement light, and vice versa. In embodiments, the ratio in radiant flux between the first part, second part, and third part of the first light generating arrangement light may be determined by (i) the percentage of the first light generating arrangement light reflected at the first beam divider, (ii) the percentage of the first light generating arrangement light reflected at the second beam divider, and (iii) the percentage of the first light generating arrangement light transmitted by the second beam divider (and reflected by the third reflector). For instance, if the first beam divider reflects 25% of the first light generating arrangement light, the second beam divider reflects 67% of the first light generating arrangement light transmitted by the first beam divider (and thus 50% of the overall first light generating arrangement light), and the second beam divider transmits the remaining 33% of the first light generating arrangement light received by the second beam divider (corresponding to 25% of the overall first light generating arrangement light), the ratio between the first part, second part, and third part of the first light generating arrangement light may be 1 :2: 1. Hence, in embodiments the (mutual) ratios of the radiant fluxes of the first part, the second part, and the third part of the first light generating arrangement may essentially not be controllable. However, the radiant flux of the first light generating arrangement light may be controllable (see also below).

[0033] Further, in embodiments, the second light generating arrangement may be configured to provide a first part of the second light generating arrangement light to the first beam combiner arrangement. Additionally or alternatively, the second light generating arrangement may be configured to provide a second part of the second light generating arrangement light to the second beam combiner arrangement. Additionally or alternatively, the second light generating arrangement may be configured to provide a third part of the second light generating arrangement light to the third beam combiner arrangement. Hence, in embodiments, the second light generating arrangement light may be divided into a first part, second part, and third part. In (such) embodiments, the light generating system, such as especially the optics, may comprise a fourth beam divider, wherein the fourth beam divider may be configured to (i) (specularly) reflect a (first) part of the second light generating arrangement light received by the fourth beam divider, and (ii) transmit a (first) propagating part of the second light generating arrangement light received by the fourth beam divider. Especially, the fourth beam divider may be configured to (i) reflect > 10%, such as > 20%, especially > 30%, of the second light generating arrangement light received by the fourth beam divider, and (ii) transmit < 90%, such as < 80%, especially < 70%, of the second light generating arrangement light received by the fourth beam divider. Alternatively, in embodiments, the fourth beam divider may be configured to (i) reflect < 75%, such as < 70%, especially < 60%, of the second light generating arrangement light received by the fourth beam divider; and (ii) transmit > 25%, such as > 30%, especially > 40%, of the second light generating arrangement light received by the fourth beam divider. Especially, the (first) part of the second light generating arrangement light reflected by the fourth beam divider may have the same spectral power distribution as the (first propagating) part of the second light generating arrangement light transmitted by the fourth beam divider. Hence, in embodiments, the fourth beam divider may be selected from (the group of) semi-transparent mirrors, such as be a transparent and specular reflective mirror and / or a semi-transparent semi-reflective specular mirror. Further, in embodiments, the fourth beam divider may especially be configured to reflect the first part of the second light generating arrangement light towards the first beam combiner arrangement. Hence, the fourth beam divider, like the first beam divider, may in embodiments comprise a transparent specular reflective mirror.

[0034] In embodiments, the light generating system, such as especially the optics, may further comprise a fifth beam divider. In embodiments, the fifth beam divider may be configured to (i) (specularly) reflect a (second) part of the second light generating arrangement light received by the fifth beam divider, and (ii) transmit a (second) propagating part of the second light generating arrangement light received by the fifth beam divider. Especially, the fifth beam divider may be configured to (i) reflect > 50%, such as > 60%, especially > 70%, of the second light generating arrangement light received by the fifth beam divider, and (ii) transmit < 50%, such as < 40%, especially < 30%, of the second light generating arrangement light received by the fifth beam divider. Alternatively, in embodiments, the fifth beam divider may be configured to (i) reflect < 95%, such as < 90%, especially < 85%, of the second light generating arrangement light received by the fifth beam divider; and (ii) transmit > 5%, such as > 10%, especially > 15%, of the second light generating arrangement light received by the fifth beam divider. Especially, the (second) part of the second light generating arrangement light reflected by the fifth beam divider may have the same spectral power distribution as the first (and / or second propagating) part of the second light generating arrangement light transmitted by the fifth beam divider. Hence, in embodiments, the fifth beam divider may be selected from (the group of) semi-transparent mirrors, such as be a transparent and specular reflective mirror and / or a semi-transparent semi-reflective specular mirror. Further, in embodiments, the fifth beam divider may especially be configured to reflect the second part of the second light generating arrangement light towards the second beam combiner arrangement (and transmit the third part of the second light generating arrangement light). Hence, in embodiments, the second light generating arrangement and the optics may be configured such that one of the beam dividers (such as especially the fifth beam divider) may be configured upstream of two to the three (first, second, and third) beam combiner arrangements. Additionally (or alternatively), in embodiments, the second light generating arrangement and the optics may be configured such that (another) one of the beam dividers (such as especially the fourth beam divider) may be configured upstream of all three (first, second, and third) beam combiner arrangements. Hence, the fifth beam divider, like the second beam divider, may in embodiments comprise a transparent specular reflective mirror.

[0035] Hence, in specific embodiments, the light generating system may further comprise a fourth beam divider and a fifth beam divider; wherein the second light generating arrangement and the optics may be configured such that (i) one of the beam dividers may be configured upstream of two of the three beam combiner arrangements, and (ii) another one of the beam dividers may be configured upstream of all three beam combiner arrangements. Such a configuration may facilitate dividing the second light generating arrangement light into a first part, second part, and third part, such that the second light generating arrangement light may irradiate the first luminescent material, the second luminescent material, and the diffuser arrangement (simultaneously).

[0036] In embodiments, the (second propagating part and / or third part of the) second light generating arrangement light transmitted by the fifth beam divider may be guided towards the third beam combiner arrangement.

[0037] In such embodiments, the light generating system, such as especially the optics, may further comprise a sixth reflector. The sixth reflector may especially be configured to reflect the (second propagating part and / or third part of the) second light generating arrangement light received by the sixth reflector (towards the third beam combiner arrangement). Especially, the sixth reflector may be configured to reflect > 80%, such as > 90%, especially > 95%, like > 99%, including (essentially) 100%, of the (second light generating arrangement) light received by the sixth reflector. In embodiments, the sixth reflector may thus receive (second light generating arrangement) light transmitted by the fifth beam divider, and reflect said light towards the third beam combiner arrangement. Hence, the sixth reflector may be configured downstream of both (of the fourth and fifth) beam dividers. Further, the sixth reflector may be configured upstream of one selected from the (first, second, and third) beam combiner arrangements. Hence, in specific embodiments, the optics may comprise a sixth reflector; wherein the sixth reflector may be configured (i) downstream of both beam dividers and (ii) upstream of one selected from the beam combiner arrangements. In embodiments, the sixth reflector may have as sole function to reflect the light received by the sixth reflector, and may thus be fully specularly reflective for the received light.

[0038] Especially, in embodiments, the first part of the second light generating arrangement light, the second part of the second light generating arrangement light, and the third part of the second light generating arrangement light may all have essentially the same spectral power distribution.

[0039] In embodiments, the second light generating arrangement may thus be configured to provide a first part of the second light generating arrangement light to the first beam combiner arrangement (via the fourth beam divider), a second part of the second light generating arrangement light to the second beam combiner arrangement (via the fifth beam divider), and a third part of the second light generating arrangement light to the third beam combiner arrangement (via the sixth reflector). Hence, in specific embodiments, the second light generating arrangement may be configured upstream of (all three of) the first beam combiner, the second beam combiner, and the third beam combiner arrangements.

[0040] In relation to the first light generating arrangement light, the (first) ratio of the first part, the second part, and the third part of the first light generating arrangement light may be fixed. In relation to the second light generating arrangement light, several embodiments may be possible. Here below, briefly a number of embodiments are described, which may be partly overlapping. Thereafter, some of the embodiments are described in more detail.

[0041] In (first) embodiments, a (second) ratio of radiant fluxes of the first part of the second light generating arrangement light, the second part of the second light generating arrangement light, and the third part of the second light generating arrangement light may be fixed. In such embodiments, there may optionally be one or more further light generating arrangements, though this is not necessarily the case.

[0042] In (second) embodiments, ratio of radiant fluxes of the first part of the second light generating arrangement light, the second part of the second light generating arrangement light, and the third part of the second light generating arrangement light may be controllable. In such embodiments, there may optionally be one or more further light generating arrangements, though this is not necessarily the case.

[0043] In (third) embodiments, there may be at least three light generating arrangements, including the first light generating arrangement, the second light generating arrangement, and a further (e.g. third) light generating arrangement. In such embodiments, the ratio of the radiant fluxes of the second light generating arrangement light and the third light generating arrangement light may be fixed. However, alternatively, in such embodiments, the ratio of the radiant fluxes of the second light generating arrangement light and the third light generating arrangement light may be fixed may be controllable. Further, in such embodiments the second light generating arrangement and the optics may be configured such that only one (or optionally two, however especially one) of the first luminescent material, the second luminescent material, and the diffuser arrangement may receive second light generating arrangement light.

[0044] Hence, as indicated above, in embodiments the ratio of radiant fluxes of the first part of the second light generating arrangement light, the second part of the second light generating arrangement light, and the third part of the second light generating arrangement light may be fixed. That is, the first part of the second light generating arrangement light may (essentially always) have the same relative radiant flux compared to the second part of the second light generating arrangement light, and vice versa. Similarly, the second part of the second light generating arrangement light may (essentially always) have the same relative radiant flux compared to the third part of the second light generating arrangement light, and vice versa. In embodiments, the ratio in radiant flux between the first part, second part, and third part of the second light generating arrangement light may be determined by (i) the percentage of the second light generating arrangement light reflected at the fourth beam divider, (ii) the percentage of the second light generating arrangement light reflected at the fifth beam divider, and (iii) the percentage of the second light generating arrangement light transmitted by the fifth beam divider (and reflected by the sixth reflector). For instance, if the fourth beam divider reflects 25% of the second light generating arrangement light, the fifth beam divider reflects 67% of the second light generating arrangement light transmitted by the fourth beam divider (and thus 50% of the overall second light generating arrangement light), and the fifth beam divider transmits the remaining 33% of the second light generating arrangement light received by the fifth beam divider (corresponding to 25% of the overall second light generating arrangement light), the ratio between the first part, second part, and third part of the second light generating arrangement light may be 1 :2: 1. Hence, in specific embodiments, a ratio of radiant fluxes of the first part of the second light generating arrangement light, the second part of the second light generating arrangement light, and the third part of the second light generating arrangement light may be fixed, and the fourth beam divider and the fifth beam divider may be selected from semi-transparent mirrors. Fixating the ratio between the radiant fluxes of the first, second, and third part of the second light generating arrangement light may provide the benefit that no controllable optics, like moving beam dividers and / or moving reflectors, etc., are needed to adjust said ratio, thereby decreasing the chance of mechanical failure of the (moving) beam dividers and / or reflectors. Further, selecting the fourth and fifth beam divider from semi-transparent mirrors may provide the benefit that the centroid wavelength Zc2 of and / or the polarization of the second light generating arrangement light may be freely selected, as the ratio of the second light generating arrangement light reflected by the beam dividers may not depend on the wavelength distribution and / or polarization of the incident light. The spectral power distribution of the system light in such embodiments may be controllable by controlling the radiant flux of the first light arrangement light and the second light arrangement light. This may thus also imply that a first ratio of the radiant fluxes of the first, second, and third part of the first light generating arrangement light may differ from a second ratio the radiant fluxes of the first, second, and third part of the second light generating arrangement light. These ratios may be chosen differently by choosing the optical properties of the optics, like especially the beam dividers. Further, the optics may be chosen such, that the system light due to the contribution of the first light arrangement light only and the system light due to the contribution of the second light arrangement light only may differ (see also below). In this way, first system light and second system light may be obtained having one or more of different color points, different CCTs, and different CRIs.

[0045] In embodiments, the first part of the first light generating arrangement light (and / or the first part of the second light generating arrangement light) may, after reflection at the first beam divider (and / or the fourth beam divider), be incident on the first beam combiner arrangement. Further, in embodiments, the second part of the first light generating arrangement light (and / or the second part of the second light generating arrangement light) may, after reflection at the second beam divider (and / or the fifth beam divider), be incident on the second beam combiner arrangement. Further yet, in embodiments, the third part of the first light generating arrangement light (and / or the third part of the second light generating arrangement light) may, after reflection at the third reflector (and / or the sixth reflector), be incident on the third beam combiner arrangement. In embodiments, in (and / or at) the beam combiner arrangements, the first, second, and third parts of the first light generating arrangement light may be combined with the first, second, and third parts of the second light generating arrangement light, respectively. Further, in embodiments, the first light generating arrangement light may irradiate the (respective) beam combiner arrangements from a different angle (with respect to a major face of the beam combiner arrangements) than the second light generating arrangement light. Especially, the first light generating arrangement light and the second light generating arrangement light may irradiate the beam combiner arrangements from perpendicular directions. Hence, (in order to combine the first and second light generating arrangement light,) the beam combiner arrangements may be configured to (i) reflect one of the first light generating arrangement light and the second light generating arrangement light, and (ii) transmit another one of the first light generating arrangement light and the second light generating arrangement light.

[0046] In embodiments, as indicated above, the first light generating arrangement light and the second light generating arrangement light may have different (especially orthogonal) (linear) polarizations. In such embodiments, the first, second, and third beam combiner arrangements may comprise polarizing beam combiners. Polarizing beam combiners (or “polarizing beam splitters”) may in embodiments be configured to reflect light with a first (linear) polarization (e.g. the first light generating arrangement light), and transmit light with a second (linear) polarization (e.g. the second light generating arrangement light), wherein the first polarization and the second polarization may especially be orthogonal. Hence, in specific embodiments, the first light generating arrangement and the second light generating arrangement may be configured to generate the light generating arrangement light comprising different polarizations, and the first, second, and third beam combiner arrangements may comprise polarizing beam combiners. Such a configuration may provide the benefit that the first light generating arrangement light may have the same centroid wavelength as the second light generating arrangement light, such that, would one or the other of the light generating arrangement be “switched off’, the centroid wavelength of the diffused (blue) light may not be altered. Alternatively (or additionally), the first light generating arrangement light and the second light generating arrangement light may have different centroid wavelengths ci and Xc2, respectively (see also above). In such embodiments, the first, second, and third beam combiner arrangements may be configured to reflect or transmit one of the first light generating arrangement light and the second light generating arrangement light based on the difference in centroid wavelength. That is, in (such) embodiments, the first, second, and third beam combiner arrangements may comprise dichroic beam combiners. In embodiments, a dichroic beam combiner 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 beam combiner) 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 beam combiner 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 beam combiner may be configured to (a) transmit or reflect (at least part of) the first light generating arrangement light, and (b) reflect or transmit at least part of the second light generating arrangement light. Thus, the first light generating arrangement and the second light generating arrangement may be selected such that the first centroid wavelength ( ci) of the first light generating arrangement light and the second centroid wavelength (Xc?) of the second light generating arrangement light are spectrally positioned at two opposite sides of a cut-on / cut-off wavelength of a dichroic beam combiner comprised by the beam combiner arrangements. Hence, the first centroid wavelength ( ci) and the second centroid wavelength ( c?) may be selected such, that the dichroic beam combiner may spectrally substantially separate them, and essentially transmit one and essentially reflect the other. Hence, in specific embodiments, the first light generating arrangement light may have a first centroid wavelength ci, and the second light generating arrangement light may have a second centroid wavelength Xc2, wherein |Xci - Xc2| > 10 nm, and wherein the first, second, and third beam combiner arrangements may comprise dichroic beam combiners. Such a configuration may provide the benefit that the first and second light generating arrangements may provide (after diffusion at the diffuser arrangement) diffused (blue) light generating arrangement light having different centroid wavelengths ci and Xc2. As such, such a configuration may provide further control over the color point and / or correlated color temperature (CCT) of the system light, by facilitating adjusting (with the control system) the centroid wavelength of the (overall) diffused light. As indicated above, especially, however, |Xci - AC2 < 65 nm, like | ci - kc2| < 50 nm, etc.

[0047] In embodiments, the first part of the first light generating arrangement light (and / or the first part of the second light generating arrangement light) may (after - in embodiments - being combined at the first beam combiner arrangement) be incident on the first luminescent material. Hence, the first luminescent material may be configured downstream of the first beam combiner arrangement. Further, in embodiments, the first luminescent material may be configured to convert at least part of (the first part of) the first light generating arrangement light received by the first luminescent material into first luminescent material light. Additionally or alternatively, in embodiments, the first luminescent material may be configured to convert at least part of (the first part of) the second light generating arrangement light received by the first luminescent material into first luminescent material light. Hence, in embodiments, the first luminescent material light may comprise a first part of the first luminescent material light resulting (only) from the first light generating arrangement light, and a second part of the first luminescent material light resulting (only) from the second light generating arrangement light. In embodiments, the first luminescent material may be configured to convert >80%, such as > 90%, especially > 95%, including (essentially) 100%, of the (first, second, and further) light generating arrangement light received by the first luminescent material into first luminescent material light.

[0048] However, whether or not the first luminescent material receives light from the first light generating arrangement and / or from the second light generating arrangement may depend upon the control system (i.e. the control of the radiant fluxes of the first light generating arrangement light and the second light generating arrangement light)(and optionally from the choice of the optics).

[0049] In embodiments, the first luminescent material light may have a first luminescent centroid wavelength kci.i selected from the range of 620-780 nm, such as from the range of 620-750 nm, especially from the range of 620-700 nm. Hence, in embodiments, the first luminescent material light may comprise, such as be, red light.

[0050] Further, in embodiments, the second part of the first light generating arrangement light (and / or the second part of the second light generating arrangement light) may (after - in embodiments - being combined at the second beam combiner arrangement) be incident on the second luminescent material. Hence, the second luminescent material may be configured downstream of the second beam combiner arrangement. Further, in embodiments, the second luminescent material may be configured to convert at least part of (the second part of) the first light generating arrangement light received by the second luminescent material into second luminescent material light. Additionally or alternatively, in embodiments, the second luminescent material may be configured to convert at least part of (the second part of) the second light generating arrangement light received by the second luminescent material into second luminescent material light. Hence, in embodiments, the second luminescent material light may comprise a first part of the second luminescent material light resulting (only) from the first light generating arrangement light, and a second part of the second luminescent material light resulting (only) from the second light generating arrangement light. In embodiments, the second luminescent material may be configured to convert >80%, such as > 90%, especially > 95%, including (essentially) 100%, of the (first, second, and further) light generating arrangement light received by the second luminescent material into second luminescent material light. In embodiments, the second luminescent material light may have a second luminescent centroid wavelength XCL2 selected from the range of 490-590 nm, such as from the range of 500-580 nm, especially from the range of 510-570 nm. Hence, in embodiments, the second luminescent material light may comprise (, such as consist of,) one or more of yellow light and green light.

[0051] Likewise, whether or not the second luminescent material receives light from the first light generating arrangement and / or from the second light generating arrangement may depend upon the control system (i.e. the control of the radiant fluxes of the first light generating arrangement light and the second light generating arrangement light)(and optionally from the choice of the optics).

[0052] 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, with the second radiation generally having a spectral power distribution at larger wavelengths than the first radiation (i.e. “down-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. Hence, upon excitation with radiation, the luminescent material may emit 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 (Ux<A'm), 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 (kA m). 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. Instead of the term “luminescent material” also the term “phosphor” may be applied. These terms are known to the person skilled in the art.

[0053] 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 embodiments, the luminescent material may comprise a divalent europium comprising oxynitride luminescent material. Further, in embodiments, the luminescent material may comprise a divalent europium comprising nitride luminescent material.

[0054] In specific embodiments, the luminescent material may at least comprise a luminescent material of the type AsBsOn 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 solid state light source light may comprise blue solid state light source 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 A3B5O12 garnets, 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. In a specific embodiment, the garnet luminescent material comprises (Yi-xLux)3B50i2: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 (Yi-xLux)3A150i2: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 (Yo.iLuo.89Ceo.oi)3A150i2. Ce in garnets is substantially or only in the trivalent state, as is known to the person skilled in the art. In embodiments, 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).

[0055] In specific embodiments, the luminescent material may only include luminescent materials selected from the type of cerium comprising garnets. In even further specific embodiments, the luminescent material may include a single type of luminescent material, such as (YxiA’X2CeX3)3(AlyiB’y2)5Oi2. Hence, in specific embodiments the first luminescent material may comprise luminescent material, wherein at least 85 weight%, even more especially at least about 90 wt.%, such as yet even more especially at least about 95 weight % of the luminescent material comprises (YxiA’X2CeX3)3(AlyiB’y2)5Oi2. Here, A’ comprises one or more elements selected from the group consisting of lanthanides, and B’ comprises one or more elements selected from the group consisting of Ga, In and Sc, wherein xl+x2+x3=l, wherein x3>0, wherein 0<x2+x3<0.2, wherein yl+y2=l, 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.

[0056] In embodiments, the luminescent material may comprise a luminescent material of the type AsSieNiuCe3, 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 LSisNs Eu2and / or MAlSiNvEu2and / or Ca2AlSi3O2Ns:Eu2+, etc., wherein M comprises one or more of Ba, Sr, and Ca, especially in embodiments at least Sr. Hence, in embodiments, the luminescent material may comprise one or more materials selected from the group consisting of (Ba,Sr,Ca)S:Eu, (Ba,Sr,Ca)AlSiN3:Eu and (Ba,Sr,Ca)2SisN8:Eu. In these compounds, europium (Eu) is substantially or only divalent, and replaces one or more of the indicated divalent cations, as is known to the person skilled in the art. 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 (indicated by M) is replaced by Eu (in these examples by Eu2+). For instance, assuming 2% Eu in CaAlSi Eu, the correct formula could be (Cao.98Euo.o2)AlSiN3. Divalent europium will in general replace divalent cations, such as the above divalent alkaline earth cations, especially Ca, Sr, or Ba.

[0057] The term “luminescent material” herein may especially relate 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.

[0058] In embodiments, the luminescent material may comprise a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises an alkaline cation, and x may be selected from the range of 0-1, wherein A comprises a tetravalent cation, for instance comprising one or more of silicon and titanium, wherein X comprises a monovalent anion, at least comprising fluorine. Such luminescent materials may herein also be indicated as “KSiF” or “KSF”, whether or not M comprises K or one or more other alkaline cations. A luminescent material of the type M’xM2-2xAX6 doped with tetraval ent manganese is amongst others described in WO2013121355A1, which is herein incorporated by reference. Passages from WO2013121355A1 are also copied herein. Relevant alkaline earth cations (M’) are magnesium (Mg), strontium (Sr), calcium (Ca) and barium (Ba), especially one or more of Sr and Ba. Relevant alkaline cations (M) are sodium (Na), potassium (K) and rubidium (Rb). Optionally, also ammonium (NHC), lithium (Li) and / or cesium (Cs) may be applied. In a preferred embodiment, M comprises at least potassium. In yet another embodiment, M comprises at least rubidium. In another preferred embodiment, M comprises at least potassium and rubidium. Optionally, the M’xM2-2xAX6 luminescent material has the hexagonal phase. In yet another embodiment, the M’xM2-2xAX6 luminescent material has the cubic phase. In an embodiment, a combination of different alkaline cations may be applied. In yet another embodiment, a combination of different alkaline earth cations may be applied. In yet another embodiment, a combination of one or more alkaline cations and one or more alkaline earth cations may be applied. For instance, KRbo.sSro^sAXe might be applied, wherein x may be selected from the range of 0-1, especially x < 1. In specific embodiments, x = 0.

[0059] The term “tetravalent manganese” refers to Mn4+. This is a well-known luminescent ion. In the formula as indicated above, part of the tetravalent cation A (such as Si) is being replaced by manganese. Hence, M’xM2-2xAX6 doped with tetravalent manganese may also be indicated as M’xM2-2xAi-mMnmX6. The mole percentage of manganese, i.e. the percentage it replaces the tetravalent cation A will in general be in the range of 0.1-15 %, especially 1-12 %, i.e. m is in the range of 0.001-0.15, especially in the range of 0.01-0.12. As manganese replaces part of a host lattice ion and has a specific function, it is also indicated as “dopant” or “activator”. Hence, the hexafluorosilicate is doped or activated with manganese (Mn4+).

[0060] In embodiments, A may comprise a tetravalent cation, and preferably at least comprises silicon. A may optionally (further) comprise one or more of titanium (Ti), germanium (Ge), stannum (Sn) and zinc (Zn). Preferably, at least 80%, even more preferably at least 90%, such as at least 95% of A consists of silicon.

[0061] As indicated above, X relates to a monovalent anion, but at least comprises fluorine. Other monovalent anions that may optionally be present may be selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I). Preferably, at least 80%, even more preferably at least 90%, such as 95% of X consists of fluorine. Especially, X essentially consists of F (fluorine).

[0062] In an embodiment, M’xM2-2xAX6 comprises BGSiFe (indicated herein also as KSiF system). In another preferred embodiment, M’xM2-2xAX6 comprises KRbSiFe (herein also indicated as K,Rb system). In specific embodiments, the indication M’xM2-2xAX6 may refer to one or more of (K,Rb)2SiFe:Mn4+, (K,Rb)2TiFe:Mn4+, K2(Si,Ti)Fe:Mn4+, and Rb2(Si,Ti)Fe:Mn4+, such as one or more of K2TiFe:Mn4+, of K2SiFe:Mn4+, and of Rb2SiFe:Mn4+, especially to K2SiFe:Mn4+. As can be derived from the above, “(Si,Ti)” may indicate one or more of Si and Ti. Hence, in specific embodiments, the luminescent material may comprise one or more of (K,Rb)2SiFe:Mn4+and K2(Si,Ti)Fe:Mn4+. The luminescent material may also be coated, as also described in WO2013121355A1.

[0063] In embodiments, the third part of the first light generating arrangement light (and / or the third part of the second light generating arrangement light) may (after - in embodiments - being combined at the third beam combiner arrangement) be incident on the diffuser arrangement. Hence, the diffuser arrangement may be configured downstream of the third beam combiner arrangement. Further, in embodiments, the diffuser arrangement may be configured to diffuse at least part of (the third part of) the first light generating arrangement light received by the diffuser arrangement into diffused light. Additionally or alternatively, in embodiments, the diffuser arrangement may be configured to convert at least part of (the third part of) the second light generating arrangement light received by the diffuser arrangement into diffused light. Hence, in embodiments, the diffused light may comprise a first part of the diffused light resulting (only) from the first light generating arrangement light, and a second part of the diffused light resulting (only) from the second light generating arrangement light.

[0064] Likewise, whether or not the diffuser arrangement receives light from the first light generating arrangement and / or from the second light generating arrangement may depend upon the control system (i.e. the control of the radiant fluxes of the first light generating arrangement light and the second light generating arrangement light)(and optionally from the choice of the optics).

[0065] In embodiments, the diffuser arrangement may be operated in the transmissive mode. That is, in embodiments, (in an operation mode of the light generating system,) the diffuser arrangement may be configured to (diffuse and) transmit at least part of the (third part of the) first light generating arrangement light (and / or the second light generating arrangement light) received by the diffuser element, such that the (transmitted) diffused light may propagate to the main beam combiner arrangement (in the same direction as the incident beam of light generating arrangement light).

[0066] Hence, herein, when an element is indicated to be operated in a transmissive mode this may, in embodiments, imply that at one or more wavelengths the part of the radiation that is transmitted may be larger than the part of the radiation that is reflected or absorbed. Hence, in embodiments, when an element is indicated to be operated in the transmissive mode this may in embodiments imply that at one or more wavelengths more than 50% of the radiation may be transmitted (rather than being reflected or absorbed), such as at least 60%. Here, the percentage refers to the percentage of the radiant flux of the radiation incident on the element (that is operated in the transmissive mode). When a luminescent material is configured in the transmissive mode, it may especially refer to a luminescent material having a non-zero thickness, wherein at one side of the luminescent material, the luminescent material may be irradiated with (excitation) light, and at another side of the luminescent material, luminescent material light (emission) may propagate away from the luminescent material. The one side and the another side may be configured at a distance defined by the non-zero thickness.

[0067] Hence, herein, when an element is indicated to be operated in a reflective mode this may, in embodiments, imply that at one or more wavelengths the part of the radiation that is reflected may be larger than the part of the radiation that is transmitted or absorbed. Hence, in embodiments, when an element is indicated to be operated in the reflective mode this may in embodiments imply that at one or more wavelengths more than 50% of the radiation may be reflected (rather than being reflected or absorbed), such as at least 60%. Here, the percentage refers to the percentage of the radiant flux of the radiation incident on the element (that is operated in the reflective mode). When a luminescent material is configured in the reflective mode, it may especially refer to a luminescent material that may be irradiated with (excitation) light at one side of the luminescent material, and at the same side of the luminescent material, luminescent material light (emission) may propagate away from the luminescent material.

[0068] By definition, a reflector may be operated in the reflective mode. A luminescent material may be operated in the reflective mode or transmissive mode. An optical filter may be operated in the reflective mode or transmissive mode, though this may depend upon the type of optical filter. For instance, in embodiments a grating may be applied in the reflective or transmissive mode.

[0069] Additionally or alternatively, in embodiments, the first luminescent material may be operated in the transmissive mode. Hence, the (first and / or second) light generating arrangement light may irradiate one side of the first luminescent material, wherein the first luminescent material light may be emitted from an opposite side of the first luminescent material then a side onto which the (first and / or second) light generating arrangement light is incident (during operation of the light generating system) on the first luminescent material.

[0070] Additionally or alternatively, the second luminescent material may be operated in the transmissive mode. Hence, the (first and / or second) light generating arrangement light may irradiate one side of the second luminescent material, wherein the second luminescent material light may be emitted from an opposite side of the second luminescent material then a side onto which the (first and / or second) light generating arrangement light is incident (during operation of the light generating system) on the second luminescent material.

[0071] Hence, in specific embodiments, (one or more of) the following may apply: (a) the first luminescent material is operated in the transmissive mode, (b) the second luminescent material is operated in the transmissive mode, and (c) the diffuser arrangement is operated in the transmissive mode. Further, in embodiments, (all of) the first luminescent material, second luminescent material, and diffuser arrangement may be operated in the transmissive mode. Operating the first luminescent material, second luminescent material, and diffuser arrangement in the transmissive mode may provide the benefit that no reflective coating may be required on the (backs of the) first luminescent material, second luminescent material, and diffuser arrangement, which could partially absorb incident light and thereby reduce the efficiency and / or luminous flux of the light generating system. Yet, in (other) embodiments, one or more of the first luminescent material, second luminescent material, and diffuser arrangement may be operated in the reflective mode (see below).

[0072] In embodiments, the first luminescent material light, second luminescent material light, and diffused light may (propagate to and) be incident on the main beam combiner arrangement. Hence, the main beam combiner arrangement may be configured downstream of the first luminescent material, the second luminescent material, and the diffuser arrangement. As will be clear to a person skilled in the art, and also referring to embodiments described herein, in embodiments one or more optical elements may be configured between the first luminescent material and the main beam combiner, and / or in embodiments one or more optical elements may be configured between the second luminescent material and the main beam combiner, and / or in embodiments one or more optical elements may be configured between the diffuser arrangement and the main beam combiner.

[0073] Further, the main beam combiner arrangement may be configured to combine two or more of: (i) (at least part of) the first luminescent material light (received via the first luminescent material), (ii) (at least part of) the second luminescent material light (received via the second luminescent material), and (iii) (at least part of) the diffused light (received via the diffuser arrangement). Especially, the main beam combiner arrangement may be configured to combine the first luminescent material light, the second luminescent material light, and the diffused light into a same optical path. In embodiments, the main beam combiner arrangement may thus be configured to provide a combined beam of light (comprising (one or more of) the first luminescent material light, the second luminescent material light, and the diffused light). In embodiments, the main beam combiner arrangement may be configured to emit (and / or transmit) the combined beam of light towards a light exit of the light generating system, or the beam combiner arrangement may comprise (or provide) the light exit.

[0074] In embodiments, the second part of the first luminescent material light, the second part of the second luminescent material light, and the second part of the diffused light may be combined into a second (portion of the) system light in the main beam combiner arrangement. As the second light generating arrangement light is not necessarily directed to two or more of the first luminescent material, the second luminescent material, and the diffuser arrangement, one or more of the second part of the first luminescent material light, the second part of the second luminescent material light, and the second part of the diffused light may be received into a second (portion of the) system light by the main beam combiner arrangement.

[0075] Further, in embodiments, the light generating system may be configured to generate system light. In embodiments, the system light may comprise the combined beam of light (provided by the main beam combiner arrangement). That is, in embodiments, the system light may comprise one or more of the first luminescent material light, the second luminescent material light, and the diffused light. In specific embodiments, the system light may comprise (one or more of) the first part of the first luminescent material light, the first part of the second luminescent material light, and the first part of the diffused light (all resulting from the first luminescent arrangement light). In such embodiments, the system light may comprise a first (portion of) system light resulting only from the first light generating arrangement light. Additionally or alternatively, the system light may comprise one or more of the second part of the first luminescent material light, the second part of the second luminescent material light, and the second part of the diffused light (all resulting from the second luminescent arrangement light). In such embodiments, the system light may comprise a second (portion of) system light resulting only from the second light generating arrangement light. Hence, in embodiments, the system light may comprise one or more of a first (portion of) system light resulting only from the first light generating arrangement light, and a second (portion of) system light resulting only from the second light generating arrangement light. Whether the system light comprises one or more of (i) a first (portion of) system light resulting only from the first light generating arrangement light, and (ii) a second (portion of) system light resulting only from the second light generating arrangement light may be controlled by the control system.

[0076] In embodiments, at least one of the first (portion of) system light and the second (portion of) system light may be white 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 1000 K and 25000 K, such as between 1500 and 20000 K, especially 1800-18000 K, for general lighting especially in the range of about 2000-7000 K, such as in the range of 2700 K and 6500 K. In embodiments, e.g. for backlighting purposes, or for other purposes, the correlated color temperature (CCT) may especially be in the range of about 7000 K and 20000 K. Yet further, in embodiments the correlated color temperature (CCT) is especially within about 15 SDCM (standard deviation of color matching) from the BBL (black body locus), especially within about 10 SDCM from the BBL, even more especially within about 5 SDCM from the BBL. Especially, in embodiments, (at least) the first (portion of) system light may be white light. That is, the first (portion of) system light may comprise a red component (resulting from the first part of the first luminescent material light), a yellow-green component (resulting from the first part of the second luminescent material light), and a blue component (resulting from the first part of the diffused light), which may be combined in the main beam combiner arrangement into white first system light. Additionally or alternatively, in embodiments, the second (portion of) system light may be white light. Yet, in (other) embodiments, the first (portion of) system light may be white light, and the second (portion of) system light may be colored light (see also below).

[0077] Hence, as also indicated above, in embodiments, the first (portion of) system light may have a different spectral power distribution than the second (portion of) system light. Especially, the first light generating arrangement light may have a different ratio of radiant fluxes of the first part, second part, and third part of the first light generating arrangement light than the ratio of radiant fluxes of the first part, second part, and third part of the second light generating arrangement light. For instance, in embodiments, the first light generating arrangement light may have a relatively high ratio of the first part of the first light generating arrangement light, resulting in a relatively large component of the (red) first luminescent material light in the first (portion of) system light, whereas the second light generating arrangement light may have a relatively high ratio of the third part of the second light generating arrangement light, resulting in a relatively large component of the (blue) diffused light in the second (portion of) system light. As such, a spectral power distribution of the first (portion of) system light may show a (relatively) higher intensity at longer wavelengths (e.g. > 620 nm) than a spectral power distribution of the second (portion of) system light. (Further,) in embodiments, the first and second (portions of) system light(s) may be white light, wherein a correlated color temperature (CCT) of the first (portion of) system light may be different (e.g. lower) than a CCT of the second (portion of) system light.

[0078] As indicated above, the system light may in embodiments comprise one or more of the first (portion of) system light and the second (portion of) system light. In embodiments, the system light may comprise visible light.

[0079] The terms “visible”, “visible light” or “visible emission” and similar terms herein refer to light having one or more wavelengths in the range of about 380-780 nm. Further, in embodiments, the system light may be white light. Alternatively, in embodiments, the system light may be colored light (see also below). Yet, especially, in embodiments the system light may in an operational mode of the light generating system be (white) light having a CCT selected from the range of 1000- 25000 K (i.e. 25,000 K), such at least about 1500 K, like selected from the range of 1500- 20000 K, especially from the range of 1800-18000 K, such as up to about 10000 K. In embodiments, the system light may further have a color rendering index selected from the range of > 60, like at least about 65, such as from the range of > 70, especially from the range of > 80, like from the range of > 90.

[0080] Further, in embodiments, the light generating system may comprise a control system, configured to control the first light generating arrangement and the second light generating arrangement (and optionally further light generating arrangements, see below), such as especially control an (first) intensity (i.e. especially radiant flux) of the first light generating arrangement light and an (second) intensity (i.e. especially radiant flux) of the second light generating arrangement light (and thus the intensity of the first system light and the second system light in the system light).

[0081] As indicated above, the first system light may have a different CCT and / or spectral power distribution than the second system light. Hence, by controlling the first light generating arrangement and the second light generating arrangement, the control system may be configured to control (such as especially vary) the CCT and / or spectral power distribution of the system light. In embodiments, the system light may thus have a variable CCT (wherein the CCT may be adjusted by the control system during operation of the light generating system). Especially, the CCT of the system light may be varied over a range of at least 400 K, like at least 500 K, such as at least about 1000 K, like even at least about 1500 K, such as at least about 2000 K. This may imply that the CCT of the system light may be varied between x K and (x+ y K), wherein x may especially be at least about 1500, and (x + y K) may especially be at maximum about 25000 K, such as at maximum about 20000 K, like at maximum about 10000 K, and y may be selected from the range of at least about 400 K, like at least about 1000 K, like even at least about 1500 K, such as at least about 2000 K. Hence, in specific embodiments, the system light may have a correlated color temperature selected from the range of 1500-20,000 K, and have a variable correlated color temperature of at least 2000 K. A CCT selected from the range of 1500-20,000 K, such as selected from the range of 1500-10000 K, may provide the benefit that the light generating system may provide system light with a relatively low blue component (suitable for e.g. darkrooms) and system light with a relatively high blue component (suitable for e.g. disinfection purposes). Further, a variable CCT of at least 2000 K may allow a user to change the appearance of the system light to mimic e.g. candle light or natural sunlight, thereby providing mood lighting.

[0082] In embodiments, the light generating system may further comprise a third light generating arrangement. The third light generating arrangement may be configured to generate third light generating arrangement light. Further, the third light generating arrangement may comprise one or more third solid state light sources. In embodiments, the one or more third solid state light sources may especially be selected from the group of solid state lasers and superluminescent diodes.

[0083] The third light generating arrangement light may be provided to one or more of the first luminescent material, the second luminescent material, and the diffuser arrangement. Hence, in embodiments, the third light generating arrangement light may be provided in three parts, which a fixed ratio of radiant fluxes of the three parts, analogous to first light generating arrangement light. However, in other embodiments the third light generating arrangement light may be provided in three parts, which a controllable ratio of the radiant fluxes (see also above for an explanation in analogous embodiments). However, in yet other embodiments, the third light generating arrangement light may only be provided to one of the first luminescent material, the second luminescent material, and the diffuser arrangement. The third light generating arrangement may be used to further control the system light. The optics may be applied to guide the third light generating arrangement light to one or more of the first luminescent material, the second luminescent material, and the diffuser arrangement, and the optics may (thus) be applied to guide one or more of the first luminescent material light, the second luminescent material light, and the diffuser light, resulting from the third light generating arrangement light to the main beam combiner arrangement.

[0084] In embodiments, the optics may comprise a fourth beam combiner arrangement, a fifth beam combiner arrangement, and a sixth beam combiner arrangement. In embodiments, the third light generating arrangement and the optics may be configured to provide a first part of the third light generating arrangement light to the first luminescent material via the fourth beam combiner arrangement. Additionally or alternatively, the third light generating arrangement and the optics may be configured to provide a second part of the third light generating arrangement light to the second luminescent material via the fifth beam combiner arrangement. Further, in embodiments, the third light generating arrangement and the optics may be configured to provide a third part of the third light generating arrangement light to the diffuser arrangement via the sixth beam combiner arrangement. In embodiments, the first luminescent material may be configured to convert at least part of the first part of the third light generating arrangement light received by the first luminescent material into (a third part of the) first luminescent material light. Alternatively or additionally, the second luminescent material may be configured to convert at least part of the second part of the third light generating arrangement light received by the second luminescent material into (a third part of the) second luminescent material light. Alternatively or additionally , in embodiments, the diffuser arrangement may be configured to diffuse at least part of the third part of the third light generating arrangement light received by the diffuser arrangement into (a third part of the) diffused light.

[0085] In embodiments, the third part of the first luminescent material light, the third part of the second luminescent material light, and the third part of the diffused light may be combined into a third (portion of the) system light in the main beam combiner arrangement. As the third light generating arrangement light is not necessarily directed to two or more of the first luminescent material, the second luminescent material, and the diffuser arrangement, one or more of the third part of the first luminescent material light, the third part of the second luminescent material light, and the third part of the diffused light may be received as a third (portion of the) system light by the main beam combiner arrangement.

[0086] Hence, in embodiments (a) the optics may comprise one or more of a fourth beam combiner arrangement, a fifth beam combiner arrangement, and a sixth beam combiner arrangement; (b) the third light generating arrangement and the optics may be configured to provide one or more of (i) via the fourth beam combiner arrangement a first part of the third light generating arrangement light to the first luminescent material, (ii) via the fifth beam combiner arrangement a second part of the third light generating arrangement light to the second luminescent material, and (iii) via the sixth beam combiner arrangement a third part of the third light generating arrangement light to the diffuser arrangement, respectively.

[0087] Further, in embodiments, the control system may (further) be configured to control the spectral power distribution of the system light by controlling the first light generating arrangement, the second light generating arrangement, and the third light generating arrangement. Hence, in specific embodiments, the light generating system may further comprise a third light generating arrangement; wherein: (A) the third light generating arrangement may be configured to generate third light generating arrangement light; wherein the third light generating arrangement may comprise one or more third solid state light sources; wherein the one or more third solid state light sources may be selected from the group of solid state lasers and superluminescent diodes; (B) the optics may comprise a fourth beam combiner arrangement, a fifth beam combiner arrangement, and a sixth beam combiner arrangement; (C) the third light generating arrangement and the optics may be configured to provide (i) via the fourth beam combiner arrangement a first part of the third light generating arrangement light to the first luminescent material, (ii) via the fifth beam combiner arrangement a second part of the third light generating arrangement light to the second luminescent material, and (iii) via the sixth beam combiner arrangement a third part of the third light generating arrangement light to the diffuser arrangement; (D) the first luminescent material may be configured to convert at least part of the first part of the third light generating arrangement light received by the first luminescent material into first luminescent material light; (E) the second luminescent material may be configured to convert at least part of the second part of the third light generating arrangement light received by the second luminescent material into second luminescent material light; (F) the diffuser arrangement may be configured to diffuse at least part of the third part of the third light generating arrangement light received by the diffuser arrangement into diffused light; and (G) the control system may be configured to control the spectral power distribution of the system light by controlling the first light generating arrangement, the second light generating arrangement, and the third light generating arrangement. A light generating system comprising a third light generating arrangement may provide more control over the CCT and / or spectral power distribution of the system light. Further, a light generating system comprising a third light generating arrangement may provide system light with a higher intensity.

[0088] In embodiments, the third light generating arrangement may be configured to generate third light generating arrangement light. In embodiments, the third light generating arrangement light may have a third centroid wavelength Xcs, selected from the range of 200- 490 nm, such as from the range of 400-490 nm, especially from the range of 440-490 nm. In embodiments, the third centroid wavelength Xcs may be different from the first centroid wavelength ci. Especially, in embodiments, |Xci - Xc3| > 5 nm, such as |Xci — Acs | > 10 nm, especially |Xci - Acs| > 15 nm. Additionally or alternatively, in embodiments, |Xci - Acs| < 50 nm, such as |Xci - Acs| < 40 nm, especially |Xci - Xc31 < 30 nm. Hence, in embodiments, the first light generating arrangement and the third light generating arrangement may be configured to generate the light generating arrangement light having different spectral power distributions. Further, in embodiments, the third centroid wavelength Xc3 may be different from the second centroid wavelength Xc2, such as 5 < |Xc2 - Acs| < 50 nm, such as 10 < |Xc2 - Xc3| < 40 nm, especially 15 < |Xc2 - Acs| < 30 nm. Yet, in embodiments, the third centroid wavelength Xcs may be the same as the second centroid wavelength Xc2, i.e., c2 = c3. Further, in embodiments, the third light generating arrangement light may be (linear) polarized light, such as having a polarization selected from the group of s-polarization and p- polarization. In embodiments, the third light generating arrangement light may have a polarization different from the first light generating arrangement light and / or the second light generating arrangement light. Yet, in (other) embodiments, the third light generating arrangement light may have the same polarization as the first light generating arrangement light (but different from the second light generating arrangement light). In yet, in (other) embodiments, the third light generating arrangement light may have the same polarization as the second light generating arrangement light (but different from the first light generating arrangement light).

[0089] Hence, in embodiments, the optics may comprise a fourth beam combiner arrangement. The fourth beam combiner arrangement may in embodiments be configured downstream of the third light generating arrangement. Additionally, in embodiments, the fourth beam combiner arrangement may be configured upstream of the first beam combiner arrangement. In embodiments, the fourth beam combiner arrangement may especially be configured to reflect (or transmit) a first part of the third light generating arrangement light, and transmit (or reflect) a first propagating part of the third light generating arrangement light received by the fourth beam combiner arrangement. In embodiments, the fourth beam combiner arrangement may be configured to reflect and / or transmit part of the third light generating arrangement light based on (centroid) wavelength and / or polarization. That is, in embodiments, the fourth beam combiner arrangement may comprise a polarizing beam combiner and / or a dichroic beam combiner, such as especially a dichroic beam combiner. Further, in embodiments, the fourth beam combiner arrangement may be configured to (i) reflect > 10%, such as > 20%, especially > 30%, of the third light generating arrangement light and (ii) transmit < 90%, such as < 80%, especially < 70%, of the third light generating arrangement light received by the fourth beam combiner arrangement. Alternatively, in embodiments, the fourth beam combiner arrangement may be configured to (i) reflect < 75%, such as < 70%, especially < 60%, of the third light generating arrangement light and (ii) transmit > 25%, such as > 30%, especially > 40%, of the third light generating arrangement light received by the fourth beam combiner arrangement. In embodiments, the fourth beam combiner arrangement may especially be configured to reflect (or transmit) the (first part of the) third light generating arrangement light towards the first beam combiner arrangement. Further, in embodiments, the fourth beam combiner arrangement may be configured downstream of the first beam divider. In embodiments, the fourth beam combiner arrangement may (thus) be configured in an optical path between the first beam divider and the first beam combiner arrangement. Hence, in embodiments, the first light generating arrangement light, such as especially the first part of the first light generating arrangement light, may be incident on the fourth beam combiner arrangement. In embodiments, the (first part of the) first light generating arrangement light may be configured to be incident on the fourth beam combiner arrangement in an orthogonal direction to the third light generating arrangement light. Further, in embodiments, the fourth beam combiner arrangement may be configured to transmit (at least part of) the first light generating arrangement light received by the fourth beam combiner arrangement. Especially, the fourth beam combiner arrangement may be configured to transmit > 80%, such as > 90%, especially > 95%, like > 99%, including (essentially) 100%, of the first light generating arrangement light received by the fourth beam combiner arrangement. In embodiments, the fourth beam combiner arrangement may be configured to transmit (at least part of) the first light generating arrangement light received by the fourth beam combiner arrangement based on a centroid wavelength and / or a polarization of the first light generating arrangement light. Hence, in embodiments, the (first part of the) first light generating arrangement light may have the same polarization as the first propagating part of the third light generating arrangement light. Alternatively (or additionally), the (first part of the) first light generating arrangement light and the first propagating part of the third light generating arrangement light may (both) have a centroid wavelength configured below a cut-off wavelength (or above a cut-on wavelength) of a dichroic beam combiner comprised by the fourth beam combiner arrangement. Hence, the first propagating part of the third light generating arrangement light and the (first part of the) first light generating arrangement light may (both) be transmitted (or reflected) by the fourth beam combiner arrangement, while (the first) part of the third light generating arrangement light may be reflected. In embodiments, the fourth beam combiner arrangement may thus be configured to (i) reflect (or transmit) a (first part of the) third light generating arrangement light received by the fourth beam combiner arrangement, and (ii) transmit (or reflect) a (first part of the) first light generating arrangement light received by the fourth beam combiner arrangement, especially in a direction of the first beam combiner arrangement. Hence, the fourth beam combiner arrangement may in embodiments be configured to combine the (first part of the) third light generating arrangement light with the (first part of the) first light generating arrangement light. Further, in embodiments the fourth beam combiner (and the fifth beam combiner) may be configured to divide the third light generating arrangement light into two parts. Hence, the fourth beam combiner (and the fifth beam combiner) may be configured as a beam splitter for the third light generating arrangement light, and as a beam combiner for the first light generating arrangement light and the (reflected part of the) third light generating arrangement light.

[0090] In embodiments, the first propagating part of the third light generating arrangement light may be incident on the fifth beam combiner arrangement. The fifth beam combiner arrangement may in embodiments be configured downstream of the fourth beam combiner arrangement. Additionally, in embodiments, the fifth beam combiner arrangement may be configured upstream of the second beam combiner arrangement. In embodiments, the fifth beam combiner arrangement may especially be configured to reflect (or transmit) a second part of the third light generating arrangement light, and transmit (or reflect) a second propagating part of the third light generating arrangement light received by the fifth beam combiner arrangement. In embodiments, the fifth beam combiner arrangement may comprise a polarizing beam combiner and / or a dichroic beam combiner, such as especially a dichroic beam combiner. Further, in embodiments, the fifth beam combiner arrangement may be configured to (i) reflect > 50%, such as > 60%, especially > 70%, of the third light generating arrangement light received by the fifth beam combiner arrangement; and (ii) transmit < 50%, such as < 40%, especially < 30%, of the third light generating arrangement light received by the fifth beam combiner arrangement. Alternatively, in embodiments, the fifth beam combiner arrangement may be configured to (i) reflect < 95%, such as < 90%, especially < 85%, of the third light generating arrangement light received by the fifth beam combiner arrangement; and (ii) transmit > 5%, such as > 10%, especially > 15%, of the third light generating arrangement light received by the fifth beam combiner arrangement. In embodiments, the fifth beam combiner arrangement may especially be configured to reflect (or transmit) the (second part of the) third light generating arrangement light towards the second beam combiner arrangement. Further, in embodiments, the fifth beam combiner arrangement may be configured downstream of the second beam divider. In embodiments, the fifth beam combiner arrangement may (thus) be configured in an optical path between the second beam divider and the second beam combiner arrangement. Hence, in embodiments, the first light generating arrangement light, such as especially the second part of the first light generating arrangement light, may be incident on the fifth beam combiner arrangement, especially in an orthogonal direction to the third light generating arrangement light. In embodiments, the fifth beam combiner arrangement may be configured to transmit > 80%, such as > 90%, especially > 95%, like > 99%, including (essentially) 100%, of the first light generating arrangement light received by the fifth beam combiner arrangement. In embodiments, the fifth beam combiner arrangement may be configured to transmit (at least part of) the first light generating arrangement light received by the fifth beam combiner arrangement based on a centroid wavelength and / or a polarization of the first light generating arrangement light. Hence, in embodiments, the (second part of the) first light generating arrangement light may have a different (especially orthogonal) polarization to the reflected (second part of the) third light generating arrangement light. Alternatively (or additionally), the (second part of the) first light generating arrangement light and the reflected (second part of the) third light generating arrangement light may have centroid wavelengths configured on opposite side of a cut-off wavelength (or cut-on wavelength) of a dichroic beam combiner comprised by the fifth beam combiner arrangement. Hence, the (second part of the) first light generating arrangement light may be transmitted (or reflected) by the fifth beam combiner arrangement, while (the second) part of the third light generating arrangement light may be reflected (or transmitted). In embodiments, the fifth beam combiner arrangement may thus be configured to combine the (second part of the) third light generating arrangement light with the (second part of the) first light generating arrangement light (and provide the combined light to the second beam combiner arrangement).

[0091] In embodiments, the second propagating part of the third light generating arrangement light may be incident on the sixth beam combiner arrangement. The sixth beam combiner arrangement may in embodiments be configured downstream of the fourth and fifth beam combiner arrangement. Additionally, in embodiments, the sixth beam combiner arrangement may be configured upstream of the third beam combiner arrangement. In embodiments, the sixth beam combiner arrangement may especially be configured to reflect (or transmit) a third part of the third light generating arrangement light. Further, in embodiments, the sixth beam combiner arrangement may especially comprise a polarizing beam combiner and / or a dichroic beam combiner, such as especially a dichroic beam combiner. In embodiments, the sixth beam combiner arrangement may be configured to reflect (or transmit) > 80%, such as > 90%, especially > 95%, like > 99%, including (essentially) 100%, of the third light generating arrangement light received by the sixth beam combiner arrangement. In embodiments, the sixth beam combiner arrangement may especially be configured to reflect (or transmit) the (third part of the) third light generating arrangement light towards the third beam combiner arrangement. Further, in embodiments, the sixth beam combiner arrangement may be configured downstream of the third reflector. In embodiments, the sixth beam combiner arrangement may (thus) be configured in an optical path between the third reflector and the third beam combiner arrangement. Hence, in embodiments, the first light generating arrangement light, such as especially the third part of the first light generating arrangement light, may be incident on the sixth beam combiner arrangement, especially in an orthogonal direction to the third light generating arrangement light. In embodiments, the sixth beam combiner arrangement may be configured to transmit (or reflect) > 80%, such as > 90%, especially > 95%, like > 99%, including (essentially) 100%, of the first light generating arrangement light received by the sixth beam combiner arrangement. In embodiments, the sixth beam combiner arrangement may be configured to transmit (or reflect) (at least part of) the first light generating arrangement light received by the sixth beam combiner arrangement based on a centroid wavelength and / or a polarization of the first light generating arrangement light, such as especially a centroid wavelength. Hence, in embodiments, the (third part of the) first light generating arrangement light and the reflected (third part of the) third light generating arrangement light may have centroid wavelengths configured on opposite side of a cut-off wavelength (or cut-on wavelength) of a dichroic beam combiner comprised by the sixth beam combiner arrangement. In embodiments, the sixth beam combiner arrangement may be configured to combine the (third part of the) third light generating arrangement light with the (third part of the) first light generating arrangement light (and provide the combined light to the third beam combiner arrangement). Hence, in specific embodiments, (i) the first light generating arrangement and the third light generating arrangement may be configured to generate the light generating arrangement light having different spectral power distributions, but comprising the same polarizations; (ii) the fourth beam combiner arrangement may be configured downstream of the first beam divider and upstream of the first beam combiner arrangement; the fifth beam combiner arrangement may be configured downstream of the second beam divider and upstream of the second beam combiner arrangement; and the sixth beam combiner arrangement may be configured downstream of the third reflector and upstream of the third beam combiner arrangement; and (iii) the fourth, fifth, and sixth beam combiner arrangements may comprise dichroic beam combiners. A first and third light generating arrangement configured to generate light generating arrangement light having different spectral power distributions may provide the benefit that the first light generating arrangement light may (essentially) not be reflected by the fourth, fifth, and sixth beam combiner arrangements comprising dichroic beam combiners, thereby facilitating combining a transmitted beam of first light generating arrangement light with a reflected beam of third light generating arrangement light. In embodiments, the third light generating arrangement light may (thus) be divided into a first part (provided to the first luminescent material), a second part (provided to the second luminescent material), and a third part (provided to the diffuser arrangement). Yet, in (alternative) embodiments, the third light generating arrangement light may not be divided into a first part, second part, and third part, yet may be (fully) provided to one of the first luminescent material, the second luminescent material, and the diffuser arrangement. In such embodiments, the light generating system, (especially the optics,) may (also) not (necessarily) comprise (all of) the fourth beam combiner arrangement, the fifth beam combiner arrangement, and the sixth beam combiner arrangement. Similarly, in embodiments, the second light generating arrangement light may not be divided into a first part, second part, and third part, yet may be (fully) provided to (another) one of the first luminescent material, the second luminescent material, and the diffuser arrangement. In such embodiments, the light generating system, (especially the optics,) may (also) not comprise (all of) the fourth beam divider, the fifth beam divider, and the sixth reflector. Further, in (such) embodiments, the light generating system may comprise a fourth light generating arrangement (which will further be discussed below).

[0092] Whether or not one or more of the first luminescent material, the second luminescent material, and the diffuser arrangement receive light from the third light generating arrangement may depend upon the control system (i.e. the control of the radiant fluxes of the first light generating arrangement light, the second light generating arrangement light, and the third light generating arrangement)(and optionally from the choice of the optics). As indicated above, the optics may in embodiments be chosen such that the third light generating arrangement light propagates to all three of the first luminescent material, the second luminescent material, and the diffuser arrangement, but may in other embodiments be chosen such that it only propagates to one or two, especially one, of the first luminescent material, the second luminescent material, and the diffuser arrangement.

[0093] Hence, in embodiments the system light may comprise one or more of the first (portion of) system light, the second (portion of) system light, and the third (portion of) system light. System light resulting only from the third light generating arrangement light may herein also be indicated as third system light.

[0094] The control system may be configured to control the first light generating arrangement, the second light generating arrangement, and the third light generating arrangement, such as especially control an (first) intensity (i.e. especially radiant flux) of the first light generating arrangement light, an (second) intensity (i.e. especially radiant flux) of the second light generating arrangement light, a (third) intensity (i.e. especially radiant flux) of the third light generating arrangement light (and thus the intensity of the first system light, the second system light in the system light, and the third system light).

[0095] The fourth light generating arrangement may be configured to generate fourth light generating arrangement light. Further, the fourth light generating arrangement may comprise one or more fourth solid state light sources, especially selected from the group of solid state lasers and superluminescent diodes.

[0096] In embodiments, one of the second light generating arrangement, the third light generating arrangement, and the fourth light generating arrangement, may be configured to provide its light generating arrangement light to the first luminescent material via the first beam combiner arrangement (wherein the first luminescent material may be configured to convert that light generating arrangement light into first luminescent material light). Additionally, another one of the second light generating arrangement, the third light generating arrangement, and the fourth light generating arrangement, may be configured to provide its light generating arrangement light to the second luminescent material via the second beam combiner arrangement (wherein the second luminescent material may be configured to convert that light generating arrangement light into second luminescent material light). Further, yet another one of the second light generating arrangement, the third light generating arrangement, and the fourth light generating arrangement, may be configured to provide its light generating arrangement light to the diffuser arrangement via the third beam combiner arrangement (wherein the diffuser arrangement may be configured to convert that light generating arrangement light into diffused light). Hence, a first one of the second light generating arrangement, the third light generating arrangement, and the fourth light generating arrangement, may be configured to provide (via the optics) its light generating arrangement light to the first luminescent material, a second one of the second light generating arrangement, the third light generating arrangement, and the fourth light generating arrangement, may be configured to provide (via the optics) its light generating arrangement light to the second luminescent material, and a third one of the second light generating arrangement, the third light generating arrangement, and the fourth light generating arrangement, may be configured to provide (via the optics) its light generating arrangement light to the diffuser arrangement. Herein, the phrase “via the optics”, and similar phrases, may refer to an optical path via one or more optical elements of the optics.

[0097] However, as can be derived from the above, in (other) embodiments (a) the second light generating arrangement may be configured to provide (via the optics) a first part of the second light generating arrangement light to the first luminescent material, a second part of the second light generating arrangement light to the second luminescent material, and a third part of the second light generating arrangement light to the diffuser arrangement, especially with a fixed ratio of the respective radiant fluxes, (b) the third light generating arrangement may be configured to provide (via the optics) one or more of a first part of the third light generating arrangement light to the first luminescent material, a second part of the third light generating arrangement light to the second luminescent material, and a third part of the third light generating arrangement light to the diffuser arrangement, especially when the third light generating arrangement is configured to provide (via the optics) parts of the third arrangement light to (all three of) the first luminescent material, the second luminescent material, and the diffuser arrangement, with a fixed ratio of the respective radiant fluxes, and (c) the fourth light generating arrangement may be configured to provide (via the optics) one or more of a first part of the fourth light generating arrangement light to the first luminescent material, a second part of the fourth light generating arrangement light to the second luminescent material, and a fourth part of the fourth light generating arrangement light to the diffuser arrangement.

[0098] Yet, in further specific embodiments, wherein the light generating system comprises both the third light generating arrangement and the fourth light generating arrangement, (a) the third light generating arrangement may be configured to provide (via the optics) one of a first part of the third light generating arrangement light to the first luminescent material, a second part of the third light generating arrangement light to the second luminescent material, and a third part of the third light generating arrangement light to the diffuser arrangement, i.e. the third light generating arrangement light is directed (via the optics) to only one of the first luminescent material, the second luminescent material, and the diffuser arrangement, and (b) the fourth light generating arrangement may be configured to provide (via the optics) one of a first part of the fourth light generating arrangement light to the first luminescent material, a second part of the fourth light generating arrangement light to the second luminescent material, and a fourth part of the fourth light generating arrangement light to the diffuser arrangement, i.e. the fourth light generating arrangement light is directed (via the optics) to only one of the first luminescent material, the second luminescent material, and the diffuser arrangement, wherein especially the following (also) applies: the third light generating arrangement light is directed (via the optics) to only one of the first luminescent material, the second luminescent material, and the diffuser arrangement, and the fourth light generating arrangement light is directed (via the optics) to only one of the first luminescent material, the second luminescent material, and the diffuser arrangement, but the third light generating arrangement light and the fourth light generating arrangement light are not directed to the same one selected from of the first luminescent material, the second luminescent material, and the diffuser arrangement. Further, especially the following may (also) apply: the second light generating arrangement light is directed (via the optics) to only one of the first luminescent material, the second luminescent material, and the diffuser arrangement, but another one than being addressed by the third light generating arrangement and the fourth light generating arrangement.

[0099] As can be derived from the above, the optics may be applied to guide the fourth light generating arrangement light to one or more of the first luminescent material, the second luminescent material, and the diffuser arrangement, and the optics may (thus) be applied to guide one or more of the first luminescent material light, the second luminescent material light, and the diffuser light, resulting from the fourth light generating arrangement light to the main beam combiner arrangement.

[0100] As the fourth light generating arrangement light is not necessarily directed to two or more of the first luminescent material, the second luminescent material, and the diffuser arrangement, one or more of the fourth part of the first luminescent material light, the fourth part of the second luminescent material light, and the fourth part of the diffused light may be received as a fourth (portion of the) system light by the main beam combiner arrangement. However, in specific embodiments, the fourth part of the first luminescent material light, the fourth part of the second luminescent material light, and the fourth part of the diffused light may be combined into a fourth (portion of the) system light in the main beam combiner arrangement.

[0101] Hence, in specific embodiments, the light generating system may comprise a third light generating arrangement and a fourth light generating arrangement, wherein: (A) the third light generating arrangement may be configured to generate third light generating arrangement light; wherein the third light generating arrangement may comprise one or more third solid state light sources; wherein the one or more third solid state light sources may be selected from the group of solid state lasers and superluminescent diodes; (B) the fourth light generating arrangement may be configured to generate fourth light generating arrangement light; wherein the fourth light generating arrangement may comprise one or more fourth solid state light sources; wherein the one or more fourth solid state light sources may be selected from the group of solid state lasers and superluminescent diodes; (C) (i) one of the second light generating arrangement, the third light generating arrangement, and the fourth light generating arrangement, may be configured to provide its light generating arrangement light via the first beam combiner arrangement to the first luminescent material, (ii) another one of the second light generating arrangement, the third light generating arrangement, and the fourth light generating arrangement, may be configured to provide its light generating arrangement light via the second beam combiner arrangement to the second luminescent material, and (iii) yet another one of the second light generating arrangement, the third light generating arrangement, and the fourth light generating arrangement, may be configured to provide its light generating arrangement light via the third beam combiner arrangement to the diffuser arrangement; and (D) the control system may be configured to control the spectral power distribution of the system light by controlling the first light generating arrangement, the second light generating arrangement, the third light generating arrangement, and the fourth light generating arrangement.

[0102] In (such) embodiments, the control system may be configured to control the spectral power distribution of the system light by controlling the first light generating arrangement, the second light generating arrangement, the third light generating arrangement, and the fourth light generating arrangement. Further, one or more of (such) embodiments of the light generating system may provide the benefit that the first luminescent material, second luminescent material, and diffuser arrangement may be irradiated separately, thereby facilitating the admixing of (only) the first luminescent material light, second luminescent material light, or diffused light into the system light.

[0103] Hence, in embodiments, in an operational mode of the light generating system, the first luminescent material may (only) receive light from (i) the first light generating arrangement, and (ii) one of the second, third, and fourth light generating arrangements, e.g. the second light generating arrangement. Additionally, in an operational mode of the light generating system, the second luminescent material may (only) receive light from (i) the first light generating arrangement, and (ii) another one of the second, third, and fourth light generating arrangements, e.g. the third light generating arrangement. Further, in an operational mode of the light generating system, the diffuser arrangement may (only) receive light from (i) the first light generating arrangement, and (ii) yet another one of the second, third, and fourth light generating arrangements, e.g. the fourth light generating arrangement. Hence, each of the second, third, and fourth light generating arrangements may be configured to provide its (respective) light generating arrangement light to one (uniquely selected from the group) of the first luminescent material, the second luminescent material, and the diffuser arrangement. For instance, the second light generating arrangement light may be provided to the first luminescent material, converted into (the second part of the) first luminescent material light, and admixed with the system light at the main beam combiner arrangement, to provide the second (portion of) system light consisting of first luminescent material light (and optionally unconverted second light generating arrangement light).

[0104] Whether or not one or more of the first luminescent material, the second luminescent material, and the diffuser arrangement receive light from the fourth light generating arrangement may depend upon the control system (i.e. the control of the radiant fluxes of the first light generating arrangement light, the second light generating arrangement light, the third light generating arrangement, and the fourth light generating arrangement)(and optionally from the choice of the optics). As indicated above, the optics may in embodiments be chosen such that it only propagates to one or two, especially one, of the first luminescent material, the second luminescent material, and the diffuser arrangement (though embodiments wherein the optics may be chosen such that the fourth light generating arrangement light propagates to all three of the first luminescent material, the second luminescent material, and the diffuser arrangement, are herein not excluded).

[0105] Hence, in embodiments the system light may comprise one or more of the first (portion of) system light, the second (portion of) system light, the third (portion of) system light, and the fourth (portion of) system light. System light resulting only from the fourth light generating arrangement light may herein also be indicated as fourth system light.

[0106] The control system may be configured to control the first light generating arrangement, the second light generating arrangement, the third light generating arrangement, and the fourth light generating arrangement, such as especially control an (first) intensity (i.e. especially radiant flux) of the first light generating arrangement light, an (second) intensity (i.e. especially radiant flux) of the second light generating arrangement light, a (third) intensity (i.e. especially radiant flux) of the third light generating arrangement light, and a (fourth) intensity (i.e. especially radiant flux) of the fourth light generating arrangement light (and thus the intensity of the first system light, the second system light in the system light, the third system light, and the fourth system light).

[0107] As indicated above, in embodiments, the light generating system may comprise a control system, configured to control one or more of a spectral power distribution, CCT, CRI, and / or color point of the system light, especially by controlling one or more of the first, second, third, and fourth light generating arrangements, especially by controlling the light generating arrangement and the second light generating arrangement, and by controlling the optional third light generating arrangement and the optional fourth light generating arrangement.

[0108] 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 on the element, 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 monitoring the element. The controlling of the element can be done with a control system, which may also be indicated as “controller”. The control system and the element may thus at least temporarily, or permanently, functionally be coupled. The element may comprise the control system. In embodiments, the control system and element may not be physically coupled. Control can be done via wired and / or wireless control. The term “control system” may also refer to a plurality of different control systems, which especially are functionally coupled, and of which e.g. one control system may be a master control system and one or more others may be slave control systems. A control system may comprise or may be functionally coupled to a user interface. The control system may also be configured to receive and execute instructions from a remote control. In embodiments, the control system may be controlled via an App on a device, such as a portable device, like a Smartphone or I- phone, a tablet, etc.. The device is thus not necessarily coupled to the lighting system, but may be (temporarily) functionally coupled to the light generating 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 light generating system may be a slave control system or control in a slave mode. The light generating 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.

[0109] Returning to the light generating arrangements, in embodiments, each of the light generating arrangement may comprise (respective) (solid state) light sources. 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 light source (such as an light emitting diode (LED) or laser diode (or “diode laser”)). The term “light source” may also relate to a plurality of (essentially identical (or different)) light sources, such as 2-2000 (solid state) (LED) light sources. 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. 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 source may be configured on the same substrate. In embodiments, a COB is a multi LED chip configured together as a single lighting module.

[0110] The term “light source” may also refer to a midpower package. A midpower package may comprise one or more solid state die(s). The die(s) may be covered by a luminescent material comprising layer. The die dimensions may be equal to or smaller than 2 mm, such as in the range of e.g. 0.2-2 mm. Herein, the term “light source” may also especially refer to a small solid state light source, such as having a mini size or micro size. For instance, the light sources may comprise one or more of mini LEDs and micro LEDs, such as especially micro LEDs or “microLEDs” or “pLEDs”. Herein, the term mini size or mini LED especially refers to solid state light sources having dimensions, such as die dimension, especially length and width, selected from the range of 100 pm - 1 mm. Herein, the term p size or micro LED especially refers to solid state light sources having dimensions, such as die dimension, especially length and width, selected from the range of 100 pm and smaller.

[0111] The light source may have a light escape surface. For LEDs 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 is 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 system may comprise a light escape surface, such as an end window. The term “light source” may refer to a semiconductor light-emitting device, such as a light emitting diode (LEDs), a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSELs), an edge emitting laser, etc... The term “light source” may also refer to an organic light-emitting diode (OLED), such as a passive-matrix (PMOLED) or an active-matrix (AMOLED). In an embodiment, the light source comprises an LED. The terms “light source” or “solid state light source” may also refer to a superluminescent diode (SLED). Especially, the term “solid state light source”, or “solid state material light source”, and similar terms, may refer to semiconductor light sources, such as a light emitting diode (LED), a laser diode, or a superluminescent diode.

[0112] In embodiments, the light source may comprise one or more micro-optical elements (array of micro lenses) downstream of a single solid-state light source, such as an LED, or downstream of a plurality of solid-state light sources (i.e. e.g. shared by multiple LEDs). In embodiments, the light source may comprise an LED with on-chip optics. In embodiments, the light source comprises pixelated single LEDs (with or without optics) (offering in embodiments on-chip beam steering). In embodiments, the light source may be configured to provide primary radiation, which is used as such, such as e.g. a blue light source, like a blue LED, or a green light source, such as a green LED, and a red light source, such as a red LED. Such LEDs, which may not comprise a luminescent material (“phosphor”) may be indicated as direct color LEDs. In other embodiments, however, the light source may be configured to provide primary radiation and part of the primary radiation is converted into secondary radiation. Secondary radiation may be based on conversion by a luminescent material. The secondary radiation may therefore also be indicated as luminescent material radiation. The luminescent material may in embodiments be comprised by the light source, such as an LED with a luminescent material layer or dome comprising luminescent material. Such LEDs may be indicated as phosphor converted LEDs or PC LEDs (phosphor converted LEDs). In other embodiments, the luminescent material may be configured at some distance (“remote”) from the light source, such as an LED with a luminescent material layer not in physical contact with a die of the LED.

[0113] In embodiments, the light generating device may comprise a luminescent material. In embodiments, the light generating device may comprise a PC LED. In other embodiments, the light generating device may comprise a direct LED (i.e. no phosphor). In embodiments, the light generating device may comprise a laser device, like a laser diode. In embodiments, the light generating device may comprise a superluminescent diode. Hence, in specific embodiments, the light source may be selected from the group of (solid state) laser diodes and superluminescent diodes. In other embodiments, the light source may comprise an LED. 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.

[0114] 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. In embodiments, the term “light source” may thus 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. Further, the term “light source” may (thus) in embodiments also refer to a light source that is (also) based on conversion of light, such as a light source in combination with a luminescent converter material. A light converter element (“converter element” or “converter”) may comprise a luminescent material comprising element. For instance, a solid state light source as such, like a blue LED, is a light source. A combination of a solid state light source (as light generating element) and a light converter element, such as a blue LED and a light converter element, optically coupled to the solid state light source, may also be a light source (but may also be indicated as light generating device). Hence, a white LED is a light source (but may e.g. also be indicated as (white) light generating device).

[0115] 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 from the spectral wavelength range of 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, may 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 (CrZnSe) 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)3 or 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 (AhO3:Cr3+), thulium YAG (Tm:YAG) laser, titanium sapphire (Ti:sapphire; AhCLHi3) laser, trival ent 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 ceramics) laser, etc. 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, AlGalnP, AlGaAs, InGaAsP, lead salt, vertical cavity surface emitting laser (VCSEL), quantum cascade laser, hybrid silicon laser, etc. The term “solid state material laser”, and similar terms, may thus 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, etc.

[0116] 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; AhO3:Ti3+) laser. For instance, considering second and third harmonic generation, such light sources may be used to generated blue light. 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.

[0117] In embodiments, 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, such as N>5, especially N>8. In this way, a higher brightness (of the laser light) may be obtained. In embodiments, laser light sources may be arranged in a laser bank. The laser light source is configured to generate laser light source light (or “laser light”). The light source light may essentially consist of the laser light source light. The light source light may also comprise laser light source light of two or more (different or identical) laser light sources. For instance, the laser light source light of two or more (different or identical) laser light sources may be coupled into a light guide, to provide a single beam of light comprising the laser light source light of the two or more (different or identical) laser light sources. In specific embodiments, the light source light is thus especially collimated (laser) light source light.

[0118] 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 <20 nm at RT, such as <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 (of the laser light source light) may be executed with one or more optics, such as especially two (focusing) lenses. 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).

[0119] As indicated above, the first luminescent material can be operated in the transmissive mode or the reflective mode. Likewise, the second luminescent material can be operated in the transmissive mode or the reflective mode. Yet, the diffuser arrangement can be operated in the transmissive mode or the reflective mode. Most of the embodiments described above are at least applicable to the transmissive mode of (all of) the first luminescent material, the second luminescent material, and the diffuser arrangement. Here below, some embodiments are described wherein all three are operated in the reflective mode. However, as indicated above, all can also be operated in the transmissive mode, or one or two can be operated in the reflective mode and two or one can be operated in the reflective mode.

[0120] Hence, in embodiments (one or more of, especially all of) the following applies: (a) the first luminescent material is operated in the reflective mode, (b) the second luminescent material is operated in the reflective mode, and (c) the diffuser arrangement is operated in the reflective mode. In such embodiments, the diffuser arrangement may comprise two polarization maintaining diffusers. A first polarization maintaining diffuser may be configured to receive p-polarized light and a second one of the polarization maintaining diffusers may be configured to receive s-polarized light. A single polarization maintaining diffuser may also be applied, but may in embodiment be less efficient than two polarization maintaining diffusers. Further, this may also imply that at least one of (a) the first light generating arrangement and (b) a further light generating arrangement, such as the second light generating arrangement, may be configured to provide p-polarized light or s- polarized light, and another one of the first light generating arrangement and the further light generating arrangement, such as the second light generating arrangement, may be configured to provide s-polarized light or p-polarized light. For instance, in embodiments the first light generating arrangement may be configured to provide s-polarized light and the second light generating arrangement may be configured to provide p-polarized light.

[0121] This may also have impact on the beam combiner arrangements. As described above, in embodiments the beam combiner arrangements may be configured upstream of the luminescent materials and may comprise polarizing beam combiners. However, specific in embodiments the third beam combiner arrangement, configured upstream of the two polarization maintaining diffusers, may comprise two polarizing beam combiners. Likewise, the light generating system may further comprise two polarization changing elements, configured upstream of the respective two polarization maintaining diffusers, and configured downstream of the respective two polarizing beam combiners (see further also above). Hence, whereas in the transmissive mode the third beam combiner arrangement may comprise a single (polarizing) beam combiner, in the reflective mode, the third beam combiner arrangement may comprise two (polarizing) beam combiners.

[0122] In this way, in embodiments arrangement light of one of the light generating arrangements may be divided into three parts via beam dividers (of which at least two are partially (specularly) reflective and partially transmissive (i.e. herein also indicated as “transparent specular reflective mirror”)). The three parts may propagate via the optics to the first luminescent material, the second luminescent material, and one of the polarization maintaining diffusers. Further, in this way in (specific) embodiments arrangement light of another one of the light generating arrangements may be divided into three parts via beam dividers (of which at least two are partially reflective and partially transmissive). The (other) three parts may propagate via the optics to (also) the first luminescent material, (also) the second luminescent material, and the other one of the polarization maintaining diffusers.

[0123] However, some of the beam dividers may be used to combine optical paths for the respective first parts to the first luminescent material and / or to combine optical paths for the respective second parts to the second luminescent material. The optical paths for the respective third parts to the respective polarization maintaining diffusers may thus at least partly not coincide, as the respective third parts have to propagate to the respective polarization maintaining diffusers.

[0124] Further, in embodiments the light generating system, more especially the optics, may further comprise a fourth beam combiner arrangement and a fifth beam combiner arrangement. Especially, the fourth beam combiner arrangement may be configured in an optical path between the first beam combiner arrangement and the first luminescent material, and may be configured downstream of the fifth beam combiner arrangement. In this way, the first part of the first light generating arrangement light and the first part of the second light generating arrangement light may be directed via the first beam combiner arrangement and the fourth beam combiner arrangement to the first luminescent material.

[0125] Further, especially the fifth beam combiner arrangement may be configured in an optical path between the second beam combiner arrangement and the second luminescent material, and may be configured in an optical path between the diffuser arrangement and the fourth beam combiner arrangement . In this way, the second part of the first light generating arrangement light and the second part of the second light generating arrangement light may be directed via the second beam combiner arrangement and the fifth beam combiner arrangement to the second luminescent material.

[0126] However, the fifth beam combiner arrangement may also be configured to receive (polarized) diffused light from the diffuser arrangement (from both polarization maintaining diffusers) and direct that light into the direction of the fourth beam combiner arrangement.

[0127] Yet, the optics may further comprise a twelfth reflector. Especially, the twelfth reflector may be configured (i) downstream of both the first beam combiner and the second beam combiner and (ii) upstream of the third beam combiner arrangements. Like the third reflector, the twelfth reflector may be fully reflective.

[0128] As indicated above, in embodiments, the light generating system may comprise a first light generating arrangement and a second light generating arrangement. The first light generating arrangement may be configured upstream of the first beam divider (and the second beam divider and the third beam divider). Further, in embodiments the second light generating arrangement may be configured upstream of one or more of the first beam combiner, the second beam combiner, and the third beam combiner arrangements. Especially, the second light generating arrangement may be configured upstream of the first beam combiner (and the second beam combiner and the third beam combiner arrangements).

[0129] As indicated above, the main beam combiner arrangement may receive first luminescent material light (when generated), second luminescent material light (when generated), and (polarized) diffused light (when generated). Especially, the reflective embodiments, the main beam combiner arrangement may comprise the fourth beam combiner arrangement. Hence, the main beam combiner arrangement may be configured to direct respective first parts of the respective first light generating arrangement and the second light generating arrangement to the first luminescent material, but may also be configured to receive via the fifth beam combiner (polarized) diffused light and second luminescent material light.

[0130] The system may comprise a light exit. The main beam combiner arrangement may be configured upstream of the light exit, or may provide the light exit. The light exit may also be provided by an optical element, like a lens or collimator.

[0131] In a further aspect, especially wherein one or more of the first luminescent material, the second luminescent material, and the diffuser arrangement are operated in the reflective mode, more especially all of the first luminescent material, the second luminescent material, and the diffuser arrangement are operated in the reflective mode, the invention may also provide a light generating system, configured to generate system light, wherein the light generating system comprises a first light generating arrangement, a second light generating arrangement, a first luminescent material, a second luminescent material, a diffuser arrangement, a control system, and optics. Especially, the optics may comprise first mirror optics, second mirror optics, and a third reflector, and a main beam combiner arrangement. Yet, in embodiments the optics may further comprise a fourth beam combiner arrangement, a fifth beam combiner arrangement, and a third beam combiner arrangement. In embodiments, (see also above), the first light generating arrangement may be configured to generate first light generating arrangement light; wherein the first light generating arrangement comprises one or more first solid state light sources; wherein the one or more first solid state light sources are selected from the group of solid state lasers and superluminescent diodes. Yet, especially in embodiments the first light generating arrangement and the optics may be configured to provide (i) via the first mirror optics and the fourth beam combiner arrangement a first part of the first light generating arrangement light to the first luminescent material, (ii) via the second mirror optics and the fifth beam combiner arrangement a second part of the first light generating arrangement light to the second luminescent material, and (iii) via the third reflector and third beam combiner arrangement a third part of the first light generating arrangement light to the diffuser arrangement. Further, especially (see also above) a ratio of radiant fluxes of the first part of the first light generating arrangement light, the second part of the first light generating arrangement light, and the third part of the first light generating arrangement light is fixed. Yet, in embodiments the first light generating arrangement and the optics may be configured such that (i) one of the mirror optics is configured upstream of two of the three beam combiner arrangements, and (ii) another one of the mirror optics is configured upstream of all three beam combiner arrangements. Further, in embodiments (see also above), the second light generating arrangement may be configured to generate second light generating arrangement light. Especially, the second light generating arrangement may comprise one or more second solid state light sources. Especially, in embodiments the one or more second solid state light sources are selected from the group of solid state lasers and superluminescent diodes. Yet, in embodiments the second light generating arrangement and the optics may be configured to provide one or more of (i) via the first mirror optics (and the fourth beam combiner a first part of the second light generating arrangement light to the first luminescent material, (ii) via the second mirror optics and fifth beam combiner arrangement a second part of the second light generating arrangement light to the second luminescent material, and (iii) via the third beam combiner arrangement a third part of the second light generating arrangement light to the diffuser arrangement. Analogously to embodiments described above, in specific embodiments the second light generating arrangement and the optics may either be configured to provide (i) via the first mirror optics (and the fourth beam combiner a first part of the second light generating arrangement light to the first luminescent material, (ii) via the second mirror optics and fifth beam combiner arrangement a second part of the second light generating arrangement light to the second luminescent material, and (iii) via the third beam combiner arrangement a third part of the second light generating arrangement light to the diffuser arrangement, or may be configured to provide one of (i) via the first mirror optics (and the fourth beam combiner a first part of the second light generating arrangement light to the first luminescent material, (ii) via the second mirror optics and fifth beam combiner arrangement a second part of the second light generating arrangement light to the second luminescent material, and (iii) via the third beam combiner arrangement a third part of the second light generating arrangement light to the diffuser arrangement (especially when also a third light generating arrangement and optionally a fourth light generating arrangement is available (to address one or more of the first luminescent material, second luminescent material, and diffuser arrangement, not addressed by the second light generating arrangement). Yet, as indicated above, the first luminescent material may be configured to convert (a) at least part of the first light generating arrangement light received by the first luminescent material, and (b) at least part of second light generating arrangement light received by the first luminescent material into first luminescent material light. Further, as indicated above, the second luminescent material may be configured to convert (a) at least part of the first light generating arrangement light received by the second luminescent material, and (b) at least part of the second light generating arrangement light received by the second luminescent material into second luminescent material light. Yet, as indicated above, the diffuser arrangement may be configured to diffuse (a) at least part of the first light generating arrangement light received by the diffuser arrangement, and (b) at least part of the second light generating arrangement light received by the diffuser arrangement into diffused light. As indicated above, whether or not the first luminescent material, second luminescent material, and diffuser arrangement receive first light generating arrangement light and / or second light generating arrangement may depend upon the control system, as well as the way the second arrangement light is propagating to the system (i.e. to one or more of the first luminescent material, second luminescent material, and diffuser arrangement). Further, as also indicated above, the main beam combiner arrangement may be configured downstream of the first luminescent material, the second luminescent material, and the diffuser arrangement, and may be configured to provide a beam of system light comprising one or more of the first luminescent material light, the second luminescent material light, and the diffused light. Further, in embodiments the system light may comprise one or more of (i) a first system light resulting only from the first light generating arrangement light, and (ii) a second system light resulting only from the second light generating arrangement light. Yet, in embodiments the first system light may be white light, and in one or more operational modes of the light generating system the second system light may have a spectral power distribution different from a spectral power distribution of the first system light (such as colored light or white light having a CRI and / or CCT different from the first system light). Yet, as indicated above, the control system may be configured to control the spectral power distribution of the system light by controlling the first light generating arrangement and the second light generating arrangement. Therefore, in a further aspect, especially wherein one or more of the first luminescent material, the second luminescent material, and the diffuser arrangement are operated in the reflective mode, more especially all of the first luminescent material, the second luminescent material, and the diffuser arrangement are operated in the reflective mode, the invention may provide (also) a light generating system, configured to generate system light, wherein the light generating system comprises a first light generating arrangement, a second light generating arrangement, a first luminescent material, a second luminescent material, a diffuser arrangement, a control system, and optics; wherein: (A) the optics comprise first mirror optics, second mirror optics, and a third reflector, and a main beam combiner arrangement; wherein the optics further comprise a fourth beam combiner arrangement, a fifth beam combiner arrangement, and a third beam combiner arrangement; (B) the first light generating arrangement is configured to generate first light generating arrangement light; wherein the first light generating arrangement comprises one or more first solid state light sources; wherein the one or more first solid state light sources are selected from the group of solid state lasers and superluminescent diodes; (C) the first light generating arrangement and the optics are configured to provide (i) via the first mirror optics and the fourth beam combiner arrangement a first part of the first light generating arrangement light to the first luminescent material, (ii) via the second mirror optics and the fifth beam combiner arrangement a second part of the first light generating arrangement light to the second luminescent material, and (iii) via the third reflector and third beam combiner arrangement a third part of the first light generating arrangement light to the diffuser arrangement, wherein a ratio of radiant fluxes of the first part of the first light generating arrangement light, the second part of the first light generating arrangement light, and the third part of the first light generating arrangement light is fixed; (D) the first light generating arrangement and the optics are configured such that (i) one of the mirror optics is configured upstream of two of the three beam combiner arrangements, and (ii) another one of the mirror optics is configured upstream of all three beam combiner arrangements; (E) the second light generating arrangement is configured to generate second light generating arrangement light; wherein the second light generating arrangement comprises one or more second solid state light sources; wherein the one or more second solid state light sources are selected from the group of solid state lasers and superluminescent diodes; (F) the second light generating arrangement and the optics are configured to provide one or more of (i) via the first mirror optics (and the fourth beam combiner a first part of the second light generating arrangement light to the first luminescent material, (ii) via the second mirror optics and fifth beam combiner arrangement a second part of the second light generating arrangement light to the second luminescent material, and (iii) via the third beam combiner arrangement a third part of the second light generating arrangement light to the diffuser arrangement; (G) the first luminescent material is configured to convert (a) at least part of the first light generating arrangement light received by the first luminescent material, and (b) at least part of second light generating arrangement light received by the first luminescent material into first luminescent material light; (H) the second luminescent material is configured to convert (a) at least part of the first light generating arrangement light received by the second luminescent material, and (b) at least part of the second light generating arrangement light received by the second luminescent material into second luminescent material light; (I) the diffuser arrangement is configured to diffuse (a) at least part of the first light generating arrangement light received by the diffuser arrangement, and (b) at least part of the second light generating arrangement light received by the diffuser arrangement into diffused light; (J) the main beam combiner arrangement is configured downstream of the first luminescent material, the second luminescent material, and the diffuser arrangement, and is configured to provide a beam of system light comprising one or more of the first luminescent material light, the second luminescent material light, and the diffused light; wherein the system light comprises one or more of (i) a first system light resulting only from the first light generating arrangement light, and (ii) a second system light resulting only from the second light generating arrangement light; wherein the first system light is white light, and wherein in one or more operational modes of the light generating system the second system light has a spectral power distribution different from a spectral power distribution of the first system light ; and (K) the control system is configured to control the spectral power distribution of the system light by controlling the first light generating arrangement and the second light generating arrangement.

[0132] When a ratio of radiant fluxes is fixed, this may refer to an operational mode wherein the radiant fluxes defining the ratio will or can essentially not be changed by the control system. Whereas (down or up) dimming may be possible, the ratio of the radiant fluxes defining the ratio may essentially stay constant.

[0133] Especially, in embodiments, one or more of the following may apply: (i) the fourth beam combiner arrangement may be configured in an optical path between the first mirror optics and the first luminescent material, and may be configured downstream of the fifth beam combiner arrangement, and (ii) the fifth beam combiner arrangement may be configured in an optical path between the second mirror optics and the second luminescent material, and may be configured in an optical path between the diffuser arrangement and the fourth beam combiner arrangement. Hence, in embodiments (i) the fourth beam combiner arrangement is configured in an optical path between the first mirror optics and the first luminescent material, and is configured downstream of the fifth beam combiner arrangement, and (ii) the fifth beam combiner arrangement is configured in an optical path between the second mirror optics and the second luminescent material, and is configured in an optical path between the diffuser arrangement and the fourth beam combiner arrangement.

[0134] As indicated above, in the reflective mode, the diffuser arrangement may comprise more elements than in the transmissive mode. In embodiments, the diffuser arrangement may comprise two polarization maintaining diffusers. One may be configured to receive predominantly s-polarized light, and the other one may be configured to receive predominantly p-polarized light. Further, in embodiments the mirror optics configured upstream of the luminescent materials may each comprise one or more of (i) polarizing beam combiners and (ii) dichroic beams combiners. Yet, the third beam combiner arrangement configured upstream of the two polarization maintaining diffusers may in (these reflective) embodiments comprise two polarizing beam combiners. Especially, the light generating system may further comprise two polarization changing elements, configured upstream of the respective two polarization maintaining diffusers, and configured downstream of the respective two polarizing beam combiners. Therefore, especially, in such (embodiments) of the light generating system, the following may (also) apply: (A) the diffuser arrangement comprises two polarization maintaining diffusers; (B) the mirror optics configured upstream of the luminescent materials may each comprise one or more of polarizing beam combiners and dichroic beams combiners; and the third beam combiner arrangement configured upstream of the two polarization maintaining diffusers may comprise two polarizing beam combiners; and (C) the light generating system further comprises two polarization changing elements, configured upstream of the respective two polarization maintaining diffusers, and configured downstream of the respective two polarizing beam combiners.

[0135] Further, in embodiments the optics may comprise a third reflector; wherein the third reflector may be configured (i) downstream of both the first mirror optics and the second mirror optics and (ii) upstream of the third beam combiner arrangements. Again, this can be a fully specular reflective reflector (essentially without transmissive properties, see also above). Further, in embodiments the second light generating arrangement may be configured upstream of one or more of the first mirror optics, the second mirror optics, and the third beam combiner arrangements. Yet, in embodiments the main beam combiner arrangement may comprises the fourth beam combiner arrangement. Hence, the optics may comprise an optical element having the function of the main beam combiner arrangement and of the fourth beam combiner arrangement. In other words, this optical element may be configured to combine at least part of the first light generating arrangement light and at least part of the second light generating arrangement light, and this optical element may be configured may be configured to combine first luminescent material light, second luminescent material light, and diffused light. Hence, in embodiments the following may apply: (A) the optics comprise a third reflector; wherein the third reflector is configured (i) downstream of both the first mirror optics and the second mirror optics and (ii) upstream of the third beam combiner arrangements; (B) the second light generating arrangement is configured upstream of one or more of the first mirror optics , the second mirror optics , and the third beam combiner arrangements; and (C) the main beam combiner arrangement comprises the fourth beam combiner arrangement.

[0136] More especially, in embodiments the second light generating arrangement may be configured upstream of all of the first mirror optics, the second mirror optics, and the third beam combiner arrangements.

[0137] Yet, in embodiments the light generating system may further comprise one or more of a third light generating arrangement, and a fourth light generating arrangement. As also indicated above, in embodiments the third light generating arrangement may be configured to generate third light generating arrangement light. Further, especially the third light generating arrangement may comprise one or more third solid state light sources. Yet especially the one or more third solid state light sources may be selected from the group of solid state lasers and superluminescent diodes. Further, as also indicated above, in embodiments the fourth light generating arrangement may be configured to generate fourth light generating arrangement light. Further, especially the fourth light generating arrangement may comprise one or more fourth solid state light sources. Yet especially the one or more fourth solid state light sources may be selected from the group of solid state lasers and superluminescent diodes.

[0138] Yet, in embodiments one or more of the following may apply: (i) one of the second light generating arrangement, the third light generating arrangement, and the fourth light generating arrangement, may be configured to provide its light generating arrangement light via the first mirror optics (and the fourth beam combiner) to the first luminescent material, (ii) another one of the second light generating arrangement, the third light generating arrangement, and the fourth light generating arrangement, may be configured to provide its light generating arrangement light via the second mirror optics (and the fifth beam combiner)to the second luminescent material, and (iii) yet another one of the second light generating arrangement, the third light generating arrangement, and the fourth light generating arrangement, may be configured to provide its light generating arrangement light via the third beam combiner arrangement to the diffuser arrangement.

[0139] Further, as can be derived from the above, the control system may be configured to control the spectral power distribution of the system light by controlling the first light generating arrangement, the second light generating arrangement, (and one or more of) the third light generating arrangement, and the fourth light generating arrangement.

[0140] Yet, in embodiments, the first light generating arrangement and the third light generating arrangement may be configured to generate the light generating arrangement light having different spectral power distributions, but comprising the same polarizations. Likewise, in embodiments the first light generating arrangement and the fourth light generating arrangement may be configured to generate the light generating arrangement light having different spectral power distributions, but comprising the same polarizations.

[0141] Further, in embodiments the fourth beam combiner arrangement may be configured downstream of the first mirror optics. Yet, in embodiments the fifth beam combiner arrangement may be configured downstream of the second mirror optics. Yet, in embodiments the third beam combiner arrangement may be configured downstream of the third reflector. Yet, in embodiments the fourth and the fifth beam combiner arrangements may comprise dichroic beam combiners.

[0142] Above, several times it has been indicated that “whether or not the first luminescent material receives light from the first light generating arrangement and / or from the second light generating arrangement may depend upon the control system (i.e. the control of the radiant fluxes of the first light generating arrangement light and the second light generating arrangement light)(and optionally from the choice of the optics)”. The phrase “and optionally from the choice of the optics”, and similar phrases may especially refer to the fact that whether or not the first luminescent material, second luminescent material, and diffuser arrangement receive second light generating arrangement may not only depend upon the control system, but may also depend upon the way the second arrangement light is propagating to the system (i.e. to one or more of the first luminescent material, second luminescent material, and diffuser arrangement).

[0143] As indicated above, in (first) embodiments, ratio of radiant fluxes of the first part of the second light generating arrangement light, the second part of the second light generating arrangement light, and the third part of the second light generating arrangement light may be fixed. Especially, in such embodiments (a) a first ratio of the radiant fluxes of the first part of the first light generating arrangement light, the second part of the first light generating arrangement light, and the third part of the first light generating arrangement, and (b) a second ratio of the radiant fluxes of the first part of the second light generating arrangement light, the second part of the second light generating arrangement light, and the third part of the second light generating arrangement light may differ, thereby providing first system light and second system light, respectively, having different spectral power distributions.

[0144] In (second) embodiments, ratio of radiant fluxes of the first part of the second light generating arrangement light, the second part of the second light generating arrangement light, and the third part of the second light generating arrangement light may be controllable. In such embodiments, there may optionally be one or more further light generating arrangements, though this is not necessarily the case. Further, in such embodiments, in operational modes of the light generating system, the first ratio and the second ratio may differ.

[0145] In (third) embodiments, there may be at least three light generating arrangements, including the first light generating arrangement, the second light generating arrangement, and a further (e.g. third) light generating arrangement. In such embodiments, the ratio of the radiant fluxes of the second light generating arrangement light and the third light generating arrangement light may be fixed. However, alternatively, in such embodiments, the ratio of the radiant fluxes of the second light generating arrangement light and the third light generating arrangement light may be fixed may be controllable. Further, in such embodiments the second light generating arrangement and the optics may be configured such that only one (or optionally two, however especially one) of the first luminescent material, the second luminescent material, and the diffuser arrangement may receive second light generating arrangement light. Hence, in such embodiments, in operational modes of the light generating system, the first ratio and the second ratio may (also) differ.

[0146] Note that the first ratio of radiant fluxes of the first part of the first light generating arrangement light, the second part of the first light generating arrangement light, and the third part of the first light generating arrangement light, may, be indicated with pi,i:p2,i:p3,i, wherein none of pi,i, P2,i, and ps,i may be zero (Watt). Similarly, the second ratio of radiant fluxes of the first part of the second light generating arrangement light, the second part of the second light generating arrangement light, and the third part of the second light generating arrangement light, may, be indicated with pi,2:p2,2:p3,2, wherein in embodiments none of pi, 2, p2,2, and ps,2 may be zero (Watt), but wherein in other embodiments one or two (especially two) of pi, 2, p2,2, and ps,2 may be zero (Watt). Hence, when first light generating arrangement light is generated, there may always be the generation of the first part of the first light generating arrangement light, the second part of the first light generating arrangement light, and the third part of the first light generating arrangement light (by the optics). However, when second light generating arrangement light is generated, there may be the generation of one or more of the first part of the second light generating arrangement light, the second part of the second light generating arrangement light, and the third part of the second light generating arrangement light (by the optics). When only one of these is generated, the term “part” may thus effectively refer to essentially all of the of the second light generating arrangement light.

[0147] Likewise, the third ratio of radiant fluxes of the first part of the third light generating arrangement light, the second part of the third light generating arrangement light, and the third part of the third light generating arrangement light, may, be indicated with pi,3:p2,3:p3,3, wherein in embodiments none of pi, 3, P2 , and ps,3 may be zero (Watt), but wherein in other embodiments one or two (especially two) of pi, 3, p2,3, and ps,3 may be zero (Watt). When the fourth light generating arrangement is available, especially two of pi, 3, p2,3, and p3,3 may be zero (Watt). When third light generating arrangement light is generated, there may be the generation of one or more of the first part of the third light generating arrangement light, the second part of the third light generating arrangement light, and the third part of the third light generating arrangement light (by the optics). When only one of these is generated, the term “part” may thus effectively refer to essentially all of the of the third light generating arrangement light.

[0148] Similarly, the fourth ratio of radiant fluxes of the first part of the fourth light generating arrangement light, the second part of the fourth light generating arrangement light, and the third part of the fourth light generating arrangement light, may, be indicated with pi,4:p2,4:p3,4, wherein in embodiments one or two (especially two) of pi, 4, p2,4, and ps,4 may be zero (Watt). When fourth light generating arrangement light is generated, there may be the generation of one or more of the first part of the fourth light generating arrangement light, the second part of the fourth light generating arrangement light, and the third part of the fourth light generating arrangement light (by the optics). When only one of these is generated, the term “part” may thus effectively refer to essentially all of the of the fourth light generating arrangement light.

[0149] Radiant fluxes, especially in relation to ratios of radiant fluxes, may refer to the radiant fluxes received by the first luminescent material, second luminescent material, and diffuser arrangement, respectively. Hence, e.g. a radiant flux of the first part of the first light generating arrangement light may especially refer to the radiant flux of the first light generating arrangement light received by the first luminescent material. Likewise, a radiant flux of the second part of the first light generating arrangement light may especially refer to the radiant flux of the first light generating arrangement light received by the second luminescent material. Yet, likewise a radiant flux of the third part of the first light generating arrangement light may especially refer to the radiant flux of the first light generating arrangement light received by the diffuser arrangement. Likewise, a radiant flux of the first part of the second light generating arrangement light may especially refer to the radiant flux of the second light generating arrangement light received by the first luminescent material. Yet, likewise, a radiant flux of the second part of the third light generating arrangement light may especially refer to the radiant flux of the third light generating arrangement light received by the second luminescent material. Yet, likewise, a radiant flux of the first part of the fourth light generating arrangement light may especially refer to the radiant flux of the fourth light generating arrangement light received by the first luminescent material. Yet, likewise, a radiant flux of the third part of the fourth light generating arrangement light may especially refer to the radiant flux of the fourth light generating arrangement light received by the diffuser arrangement.

[0150] Hence, in embodiments the invention provides CCT control using laser banks by splitting laser bank light in different portions for focusing laser light on phosphors and a diffuser. More especially, the invention provides CCT control using laser banks by unequal splitting different laser bank light in different portions for combined focusing laser light on different phosphors and a diffuser. This may be achieved with (embodiments of) the light generating system as described herein.

[0151] The light generating system may be part of or may be applied in e.g. office lighting systems, household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive applications, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, digital projection, or LCD backlighting. The light generating system (or luminaire) may be part of or may be applied in e.g. optical communication systems or disinfection systems.

[0152] 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.

[0153] 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.

[0154] 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).

[0155] 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.

[0156] In yet a further aspect, the invention also provides a lamp or a luminaire comprising the light generating system as defined herein. The luminaire may further comprise a housing, optical elements, louvres, etc. etc... The lamp or luminaire may further comprise a housing enclosing the light generating system. The lamp or luminaire may comprise a light window in the housing or a housing opening, through which the system light may escape from the housing. In yet a further aspect, the invention also provides a projection device comprising the light generating system as defined herein. Especially, a projection device or “projector” or “image projector” may be an optical device that projects an image (or moving images) onto a surface, such as e.g. a projection screen. The projection device may include one or more light generating systems such as described herein. Hence, in an aspect the invention also provides a lighting device selected from the group of a lamp, a luminaire, a projector device, a disinfection device, a photochemical reactor, and an optical wireless communication device, comprising the light generating system as defined herein. The lighting device may comprise a housing or a carrier, configured to house or support, one or more elements of the light generating system. For instance, in embodiments the lighting device may comprise a housing or a carrier, configured to house or support one or more of the optics, the control system, the lighting arrangements, etc.

[0157] BRIEF DESCRIPTION OF THE DRAWINGS

[0158] 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:

[0159] Fig. 1 A-E schematically depict embodiments of the light generating system in the transmissive mode;

[0160] Fig. 2A-C schematically depict embodiments of the light generating system in the reflective mode;

[0161] Fig. 3 A-C schematically depict further embodiments of the light generating system in the reflective mode; and

[0162] Fig. 4 schematically depicts an embodiments of the lighting device.

[0163] The schematic drawings are not necessarily to scale.

[0164] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0165] Fig. 1 A-E schematically depict an embodiment of the light generating system 1000 configured to generate system light 1001. The light generating system may comprise a first light generating arrangement 2000, a second light generating arrangement 3000, a first luminescent material 210, a second luminescent material 220, a diffuser arrangement 710, a control system 300, and optics 500. The optics 500 may comprise a first beam divider TRI, a second beam divider TR2, a first beam combiner arrangement Cl, a second beam combiner arrangement C2, a third beam combiner arrangement C3, and a main beam combiner arrangement 590. Optionally, the optics 500 may further comprise a third reflector R3. In embodiments, the first beam divider TRI and the second beam divider TR2 may (both) be transparent specular reflective mirrors. Further, the optics 500 may comprise a fourth beam divider TR4 and a fifth beam divider TR5. The fourth beam divider TR4 and the fifth beam divider TR5 may be selected from semi-transparent mirrors.

[0166] The first light generating arrangement 2000 may be configured to generate first light generating arrangement light 2001. Further, the first light generating arrangement

[0167] 2000 may comprise one or more first solid state light sources 10. The one or more first solid state light sources 10 may especially be selected from the group of solid state lasers and superluminescent diodes. The first light generating arrangement 2000 and the optics 500 may be configured to provide a first part of the first light generating arrangement light 2001 to the first luminescent material 210 via the first beam divider TRI and the first beam combiner arrangement Cl. Additionally, the first light generating arrangement 2000 and the optics 500 may be configured to provide a second part of the first light generating arrangement light

[0168] 2001 to the second luminescent material 220 via the second beam divider TR2 and the second beam combiner arrangement C2. Further, the first light generating arrangement 2000 and the optics 500 may be configured to provide a third part of the first light generating arrangement light 2001 to the diffuser arrangement 710 via the third beam combiner arrangement C3 (and the third reflector R3). In embodiments, a ratio of radiant fluxes of the first part of the first light generating arrangement light 2001, the second part of the first light generating arrangement light 2001, and the third part of the first light generating arrangement light 2001 may be fixed. Further, the first light generating arrangement 2000 and the optics 500 may be configured such that (i) one of the beam dividers TR1,TR2 (such as especially the second beam divider TR2) may be configured upstream of two of the three beam combiner arrangements C1,C2,C3, and (ii) another one of the beam dividers TR1,TR2 (such as especially the first beam divider TRI) may be configured upstream of all three beam combiner arrangements C1,C2,C3. Further, as indicated above, the optics 500 may comprise a third reflector R3. In embodiments, the (first light generating arrangement 2000 and the optics 500 may be configured such that the) third reflector R3 may be configured (i) downstream of both beam dividers TR1,TR2 and (ii) upstream of one selected from the beam combiner arrangements C1,C2,C3, such as especially the third beam combiner arrangement C3.

[0169] The second light generating arrangement 3000 may be configured to generate second light generating arrangement light 3001. As such, the second light generating arrangement 3000 may comprise one or more second solid state light sources 20. In embodiments, the one or more second solid state light sources 20 may be selected from the group of solid state lasers and superluminescent diodes. Further, the second light generating arrangement 3000 and the optics 500 may be configured to provide a first part of the second light generating arrangement light 3001 to the first luminescent material 210 via the first beam combiner arrangement Cl (and optionally via the fourth beam divider TR4, see e.g. Fig. 1 A and Fig. IB). Additionally or alternatively, the second light generating arrangement 3000 and the optics 500 may be configured to provide a second part of the second light generating arrangement light 3001 to the second luminescent material 220 via the second beam combiner arrangement C2 (and optionally via the fifth beam divider TR5, see e.g. Fig. 1 A and Fig. IB). Additionally or alternatively, the second light generating arrangement 3000 and the optics 500 may be configured to provide a third part of the second light generating arrangement light 3001 to the diffuser arrangement 710 via the third beam combiner arrangement C3 (and optionally via a sixth reflector R6, see e.g. Fig. 1 A and Fig. IB). Hence, the second light generating arrangement 3000 may be configured upstream of (all three of) the first beam combiner Cl, the second beam combiner C2, and the third beam combiner arrangements C3. In embodiments, a ratio of radiant fluxes of the first part of the second light generating arrangement light 3001, the second part of the second light generating arrangement light 3001, and the third part of the second light generating arrangement light 3001 may be fixed. Further, the second light generating arrangement 3000 and the optics 500 may be configured such that (i) one of the beam dividers TR4,TR5 (such as especially the fifth beam divider TR5) is configured upstream of two of the three beam combiner arrangements C1,C2,C3, and (ii) another one of the beam dividers TR4,TR5 (such as especially the fourth beam divider TR4) is configured upstream of all three beam combiner arrangements C1,C2,C3. Further yet, the optics 500 may comprise the sixth reflector R6, wherein the sixth reflector R6 may be configured (i) downstream of both beam dividers TR4,TR5 and (ii) upstream of one selected from the beam combiner arrangements C1,C2,C3 (such as especially the third beam combiner arrangement C3).

[0170] The first luminescent material 210 may configured to convert at least part of (the first part of) the first light generating arrangement light 2001 received by the first luminescent material 210 into first luminescent material light 211. Additionally, the first luminescent material 210 may configured to convert at least part of (the first part of the) second light generating arrangement light 3001 received by the first luminescent material 210 into first luminescent material light 211. Hence, in embodiments, the first luminescent material light 211 may comprise a first part originating from the first light generating arrangement light 2001, and a second part originating from the second light generating arrangement light 3001. Further, the second luminescent material 220 may be configured to convert at least part of (the second part of) the first light generating arrangement light 2001 received by the second luminescent material 220 into second luminescent material light 221. Additionally, the second luminescent material 220 may be configured to convert at least part of (the second part of) the second light generating arrangement light 3001 received by the second luminescent material 220 into second luminescent material light 221. Hence, in embodiments, the second luminescent material light 221 may comprise a first part originating from the first light generating arrangement light 2001, and (optionally) a second part originating from the second light generating arrangement light 3001. Further, the diffuser arrangement 710 may be configured to diffuse at least part of (the third part of) the first light generating arrangement light 2001 received by the diffuser arrangement 710 into diffused (blue) light 711. Additionally, the diffuser arrangement 710 may be configured to diffuse at least part of (the third part of) the second light generating arrangement light 3001 received by the diffuser arrangement 710 into diffused light 711. Hence, in embodiments, the diffused light 711 may comprise a first part originating from the first light generating arrangement light 2001, and (optionally) a second part originating from the second light generating arrangement light 3001.

[0171] Following the path of the first light generating arrangement light 2001 (and / or the second light generating arrangement light 3001), the main beam combiner arrangement 590 may be configured downstream of the first luminescent material 210, the second luminescent material 220, and the diffuser arrangement 710. Further, the main beam combiner arrangement 590 may be configured to provide a beam of system light 1001 comprising one or more of the first luminescent material light 211, the second luminescent material light 221, and the diffused light 711. The beam of system light may especially exit the light generating system 1000 via a light exit 1500 of the light generating system 1000. Here, the light exit 1500 is schematically depicted as lens. However, other options may also be possible, like an opening, a collimator, etc. The system light 1001 may comprise one or more of (i) a first system light 1001a resulting only from the first light generating arrangement light 2001 (see Fig. 1C), and (ii) a second system light 1001b resulting only from the second light generating arrangement light 3001 (see Fig. IB). In embodiments, (at least one of) the first system light 1001a (and the second system light 1001b) may be white light. Further, in one or more operational modes of the light generating system 1000, the second system light 1001b may have a spectral power distribution different from a spectral power distribution of the first system light 1001a. Further yet, the control system 300 may be configured to control the spectral power distribution of the system light 1001 by controlling the first light generating arrangement 2000 and the second light generating arrangement 3000. Hence, in embodiments, the system light 1001 may have a correlated color temperature (CCT) selected from the range of 1500-20,000 K, and a variable correlated color temperature of at least 2000 K. That is, the control system 300 may be configured to adjust the CCT of the system light 1001 over a range of at least 2000 K.

[0172] Returning to the first light generating arrangement 2000, the first light generating arrangement 2000 may comprise a first laser bank 2100(, wherein the first laser bank 2100 may be) configured to generate the first light generating arrangement light 2001. Further, the second light generating arrangement 3000 may comprise a second laser bank 3100(, wherein the second laser bank 3100 may be) configured to generate the second light generating arrangement light 3001. As depicted in e.g. Fig. 1A, the first, second, and third beam combiner arrangement C1,C2,C3 may be configured to transmit one of the first light generating arrangement light 2001 and the second light generating arrangement light 3001, and reflect the other of the first light generating arrangement light 2001 and the second light generating arrangement light 3001. This may be due to the optical properties of the first light generating arrangement light 2001 and the second light generating arrangement light 3001. That is, in embodiments, the first light generating arrangement 2000 and the second light generating arrangement 3000 may be configured to generate the light generating arrangement light 2001,3001 comprising different linear polarizations, and the first, second, and third beam combiner arrangements C1,C2,C3 may comprise polarizing beam combiners. Hence, the first, second, and third beam combiner arrangements C1,C2,C3 may be configured to reflect and / or transmit light based on (linear) polarization. Alternatively, the first light generating arrangement light 2001 may have a first centroid wavelength ci, and the second light generating arrangement light 3001 may have a second centroid wavelength Xc2, wherein |Xci - Xc2| > 10 nm, and wherein the first, second, and third beam combiner arrangements C1,C2,C3 comprise dichroic beam combiners. Hence, the first, second, and third beam combiner arrangements C1,C2,C3 may be configured to reflect and / or transmit light based on (a difference in) centroid wavelength.

[0173] Fig. 1 A schematically depicts an embodiment of the light generating system 1000 in an operational mode wherein (both) the first light generating arrangement 2000 and the second light generating arrangement 3000 provide respective light generating arrangement light 2001,3001. As depicted, the light generating system 1000 may further comprise a seventh reflector R7, an eight reflector R8, a ninth reflector R9, a tenth reflector R10, and an eleventh reflector R11. Starting from the first part of the first light generating arrangement light 2001, the light may be reflected at the first beam divider TRI, reflected at the seventh reflector R7, reflected at the first beam combiner arrangement Cl, and may irradiate the first luminescent material 210 to be (at least partially) converted into (the first part of the) first luminescent material light 211. The second part of the first light generating arrangement light 2001, meanwhile, may be transmitted by the first beam divider TRI, reflected at the second beam divider TR2, reflected at the eighth reflector R8, reflected at the second beam combiner arrangement C2, and may subsequently irradiate the second luminescent material 220 to be (at least partially) converted into (the first part of the) second luminescent material light 221. Further, the third part of the first light generating arrangement light 2001 may be transmitted by the first beam divider TRI and the second beam divider TR2, reflected at the third reflector R3, reflected at the ninth reflector R9, reflected at the third beam combiner arrangement C3, and may irradiate the diffuser arrangement 710 to be (at least partially) diffused into (the first part of the) diffused light 711.

[0174] Turning to the second light generating arrangement light 3001, the first part of the second light generating arrangement light 3001 may be reflected at the fourth beam divider TR4, transmitted by the first beam combiner arrangement Cl, and may irradiate the first luminescent material 210 to be (at least partially) converted into (the second part of the) first luminescent material light 211. The second part of the second light generating arrangement light 3001, meanwhile, may be transmitted by the fourth beam divider TR4, reflected at the fifth beam divider TR5, transmitted by the second beam combiner arrangement C2, and may irradiate the second luminescent material 220 to be (at least partially) converted into (the second part of the) second luminescent material light 221. Further, the third part of the second light generating arrangement light 3001 may be transmitted by the fourth beam divider TR4 and the fifth beam divider TR5, reflected at the sixth reflector R6, transmitted by the third beam combiner arrangement C3, and may irradiate the diffuser arrangement 710 to be (at least partially) diffused into (the second part of the) diffused light 711. The diffused light 711 may be reflected at the eleventh reflector R11 to be incident on the main beam combiner arrangement 590. Further, the first luminescent material light 211 may be reflected at the tenth reflector R10 to be incident on the main beam combiner arrangement 590, while the second luminescent material light 221 may be (directly) transmitted to the main beam combiner arrangement 590. The main beam combiner arrangement 590 may combine the first luminescent material light 211, the second luminescent material light 221, and the diffused light 711 to provide the system light 1001. As schematically depicted in Fig. 1 A, (one or more of) the following may apply: (a) the first luminescent material 210 may be operated in the transmissive mode, (b) the second luminescent material 220 may be operated in the transmissive mode, and (c) the diffuser arrangement 710 may be operated in the transmissive mode.

[0175] Fig. IB schematically depicts an embodiment of (an operational mode of) the light generating system 1000, wherein the second light generating arrangement 3000 is providing second light generating arrangement light 3001, and the first light generating arrangement 2000 is configured in an off-state state (by the control system 300). Hence, the system light 1001 may (essentially) consist of the second system light 1001b. As schematically depicted, the fourth beam divider TR4 and the fifth beam divider TR5 may be configured such, that the second system light 1001b may comprise (and the second light generating arrangement light 3001 may thus provide) a relatively larger component of the (second part of the) diffused light 711 than of the (second part of the) first luminescent material light 211.

[0176] Fig. 1C schematically depicts an embodiment of (an operational mode of) the light generating system 1000, wherein the first light generating arrangement 2000 is providing first light generating arrangement light 2001, and the second light generating arrangement 3000 is configured in an off-state state (by the control system 300). Hence, the system light 1001 may (essentially) consist of the first system light 1001a. As schematically depicted, the first beam divider TRI and the second beam divider TR2 may be configured such, that the first system light 1001a may comprise (and the first light generating arrangement light 2001 may thus provide) a relatively larger component of the (first part of the) first luminescent material light 211 than of the (first part of the) diffused light 711. Hence, the second system light 1001b may have a larger blue component (and thus a higher correlated color temperature) than the first system light 1001a, and the control system 300 may be configured to (and able to) control a spectral power distribution of the (overall) system light 1001 by controlling the first light generating arrangement 2000 and the second light generating arrangement 3000.

[0177] Fig. ID schematically depicts an embodiment of the light generating system 1000 further comprising a third light generating arrangement 4000 (or “third lighting arrangement 4000”) and a fourth light generating arrangement 5000 (or “fourth lighting arrangement 5000”). The third light generating arrangement 4000 may be configured to generate third light generating arrangement light 4001. In embodiments, the third light generating arrangement 4000 may comprise a third laser bank 4100 configured to generate the third light generating arrangement light 4001. Additionally or alternatively, the third light generating arrangement 4000 (and / or the third laser bank 4100) may comprise one or more third solid state light sources 30. The one or more third solid state light sources 30 may especially be selected from the group of solid state lasers and superluminescent diodes. Further, the fourth light generating arrangement 5000 may be configured to generate fourth light generating arrangement light 5001. In embodiments, the fourth light generating arrangement 5000 may comprise a fourth laser bank 5100 configured to generate the fourth light generating arrangement light 5001. Additionally or alternatively, the fourth light generating arrangement 5000 (and / or the fourth laser bank 4100) may comprise one or more fourth solid state light sources 40. The one or more fourth solid state light sources 40 may especially be selected from the group of solid state lasers and superluminescent diodes. In embodiments, one of the second light generating arrangement 3000, the third light generating arrangement 4000, and the fourth light generating arrangement 5000 may be configured to provide its light generating arrangement light 3001,4001,5001 to the first luminescent material 210 via the first beam combiner arrangement Cl (wherein the first luminescent material 210 may be configured to convert that light generating arrangement light 3001,4001,5001 received by the first luminescent material 210 into first luminescent material light 211). In the embodiment depicted in Fig. ID, especially the second light generating arrangement 3000 is configured to provide its second light generating arrangement light 3001 to the first luminescent material 210 (via the seventh reflector R7 and the first beam combiner arrangement Cl). Further, another one of the second light generating arrangement 3000, the third light generating arrangement 4000, and the fourth light generating arrangement 5000 may be configured to provide its light generating arrangement light 3001,4001,5001 to the second luminescent material 220 via the second beam combiner arrangement C2 (wherein the second luminescent material 220 may be configured to convert that light generating arrangement light 3001,4001,5001 received by the second luminescent material 220 into second luminescent material light 221). In the embodiment depicted in Fig. ID, especially the third light generating arrangement 4000 is configured to provide its third light generating arrangement light 4001 to the second luminescent material 220 (via the eighth reflector R8 and the second beam combiner arrangement C2). Further yet, yet another one of the second light generating arrangement 3000, the third light generating arrangement 4000, and the fourth light generating arrangement 5000 may be configured to provide its light generating arrangement light 3001,4001,5001 to the diffuser arrangement 710 via the third beam combiner arrangement C3 (wherein the diffuser arrangement 710 may be configured to convert that light generating arrangement light 3001,4001,5001 received by the diffuser arrangement 710 into diffused light 711). In the embodiment depicted in Fig. ID, especially the fourth light generating arrangement 5000 may be configured to provide its fourth light generating arrangement light 5001 to the diffuser arrangement 710 (via the ninth reflector R9 and the third beam combiner arrangement C2). In embodiments, the control system 300 may (thus) be configured to control the spectral power distribution of the system light 1001 by controlling the first light generating arrangement 2000, the second light generating arrangement 3000, the third light generating arrangement 4000, and the fourth light generating arrangement 5000. Hence, the system light 1001 may comprise a third (portion of) system light 1001c resulting only from the third light generating arrangement light 4001. Further, the system light 1001 may comprise a fourth (portion of) system light 100 Id resulting only from the fourth light generating arrangement light 5001. Fig. IE schematically depicts a further embodiment of the light generating system 1000 comprising a third light generating arrangement 4000. In embodiments, the first light generating arrangement 2000 and the third light generating arrangement 4000 may be configured to generate the light generating arrangement light 2001,4001 having different spectral power distributions, but comprising the same (linear) polarizations. Hence, in embodiments, the first light generating arrangement light 2001 and the third light generating arrangement light 4001 may have the same (linear) polarization, but a different spectral power distribution. Further, as depicted in Fig. IE, the optics 500 may comprise a fourth beam combiner arrangement C4, a fifth beam combiner arrangement C5, and a sixth beam combiner arrangement C6. (With respect to the first and / or third light generating arrangement 2000,4000,) the fourth beam combiner arrangement C4 may be configured downstream of the first beam divider TRI and upstream of the first beam combiner arrangement Cl. Further, the fifth beam combiner arrangement C5 may be configured downstream of the second beam divider TR2 and upstream of the second beam combiner arrangement C2. Additionally or alternatively, the sixth beam combiner arrangement C6 may be configured downstream of the third reflector R3 and upstream of the third beam combiner arrangement C3. As indicated, the first light generating arrangement light 2001 may have the same polarization but a different spectral power distribution than the third light generating arrangement light 4001. Hence, the fourth, fifth, and sixth beam combiner arrangement C4,C5,C6 may comprise dichroic beam combiners (or “dichroic beam combiners”). Especially the fourth, fifth, and sixth beam combiner arrangement C4,C5,C6 may be configured (based on the difference in spectral power distribution) to transmit the first light generating arrangement light 2001 and reflect the third light generating arrangement light 4001. Hence, the third light generating arrangement 4000 and the optics 500 may be configured to provide a first part of the third light generating arrangement light 4001 to the first luminescent material 210 via the fourth beam combiner arrangement C4(, the seventh reflector R7, and the first beam combiner arrangement Cl). Additionally or alternatively, the third light generating arrangement 4000 and the optics 500 may be configured to provide a second part of the third light generating arrangement light 4001 to the second luminescent material 220 via the fifth beam combiner arrangement C5(, the eighth reflector R8, and the second beam combiner arrangement C2). Additionally or alternatively, the third light generating arrangement 4000 and the optics 500 may be configured to provide a third part of the third light generating arrangement light 4001 to the diffuser arrangement 710 via the sixth beam combiner arrangement C6(, the ninth reflector R9, and the third beam combiner arrangement C3). The first luminescent material 210 may be configured to convert at least part of the first part of the third light generating arrangement light 4001 received by the first luminescent material 210 into (a third part of the) first luminescent material light 211. Similarly, the second luminescent material 220 may be configured to convert at least part of the second part of the third light generating arrangement light 4001 received by the second luminescent material 220 into (a third part of the) second luminescent material light 221. Further, the diffuser arrangement 710 may be configured to diffuse at least part of the third part of the third light generating arrangement light 4001 received by the diffuser arrangement 710 into (a third part of the) diffused light 701. In embodiments, (such as for instance in the embodiment depicted in Fig. IE,) the control system 300 may be configured to control the spectral power distribution of the system light 1001 by controlling the first light generating arrangement 2000, the second light generating arrangement 3000, and the third light generating arrangement 4000.

[0178] Fig. 2A schematically depicts an embodiment of the light generating system 1000 in the reflective mode. In embodiments, the diffuser arrangement 710 may comprise two polarizing maintaining diffusers 710’, 710”. Further, the beam combiner arrangement C1,C2 configured upstream of the luminescent materials 210,220 may comprise polarizing beam combiners (or “polarizing beam splitters”). Additionally or alternatively, the third beam combiner arrangement C3 configured upstream of the two polarization maintaining diffusers 710’, 710” may comprise two (respective) polarizing beam combiners C31,C32. Further, the light generating system 1000 may comprise two polarization changing elements 810 (such as selected from the group comprising e.g. quarter-wave plates and Faraday rotators), configured upstream of the respective two polarization maintaining diffusers 710’, 710”, and configured downstream of the respective two polarizing beam combiners C31,C32. Starting from the first light generating arrangement 2000, the first part of the first light generating arrangement light 2001 is reflected at the first beam divider TRI, transmitted by the first beam combiner arrangement Cl, transmitted by the fourth beam combiner arrangement C4, and incident on the first luminescent material 210 to be converted into (the first part of the) first luminescent material light 211. The (first part of the) first luminescent material light 211 is subsequently reflected at the (back of the) first luminescent material 210 and emitted in the opposite direction of the incoming beam of (the first part of the) first light generating arrangement light 2001, i.e., towards the fourth beam combiner arrangement C4. Then, the (first part of the) first luminescent material light 211 is reflected at the fourth beam combiner arrangement C4, to become (part of the) system light 1000. Conversely, the second part of the first light generating arrangement light 2001 is transmitted by the first beam divider TRI, reflected at the second beam divider TR2, transmitted by the second beam combiner arrangement C2, transmitted by the fifth beam combiner arrangement C5, and incident on the second luminescent material 220 to be converted into (the first part of the) second luminescent material light 221. The (first part of the) second luminescent material light 221 is subsequently reflected at the (back of the) first luminescent material 220 and emitted in the opposite direction of the incoming beam of (the second part of the) first light generating arrangement light 2001, i.e., towards the fifth beam combiner arrangement C5. Then, the (first part of the) second luminescent material light 221 is reflected at the fifth beam combiner arrangement C5 and transmitted by the fourth beam combiner arrangement C4 to become (part of the) system light 1000. The third part of the first light generating arrangement light 2001 is transmitted by the first beam divider TRI and the second beam divider TR2, reflected at the third reflector R3, transmitted by the third beam combiner arrangement C3 (especially by the polarizing beam combiner C31), transmitted through the polarization changing element 810, and incident on the polarization maintaining diffuser 710’ to be diffused into (the first part of the) diffused light 711, which may be reflected (and / or emitted) towards the polarization changing element 810, transmitted by the polarization changing element 810, reflected at the polarizing beam combiner C31, and transmitted by the fifth and fourth beam combiner arrangements C5,C4 to become (part of the) system light 1000. Hence, (one or more of) the following may apply: (a) the first luminescent material 210 may be operated in the reflective mode, (b) the second luminescent material 220 may be operated in the reflective mode, and (c) the diffuser arrangement 710 may be operated in the reflective mode.

[0179] Upon transmitting the third part of the first light generating arrangement light 2001 through the polarization changing element 810, the polarization of the third part of the first light generating arrangement light 2001 is changed. Especially, starting with e.g. 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 diffuser 710’ into left-handed circular polarized light, which is converted by the polarization changing element 810 (after reflection of the diffused light 711 at the polarization maintaining diffuser 710’) into linear s-polarized light. Likewise, s-polarized light may be converted into diffused p-polarized light. Hence, the third part of the first light generating arrangement light 2001 may pass the polarization changing element 810 twice, one time propagating from the first light generating arrangement 2000 to the polarization maintaining diffuser 710’ while having a first polarization, and one time propagating from the polarization maintaining diffuser 710’ to the light exit 1500 of the light generating system 1000, being diffused into (the first part of the) diffused light 711 at the diffuser arrangement 710 and obtaining a second polarization when passing the polarization changing element 810 (in the direction of the light exit 1500). Hence, the polarizing beam combiner C31 may be configured to transmit light with a first polarization (corresponding to the polarization of the first light generating arrangement light 2001), and to reflect light with an orthogonal polarization (corresponding to the polarization of the diffused light 711). Further, the fourth beam combiner arrangement C4 may be (when viewed from the first light generating arrangement 2000) configured in an optical path between the first beam combiner arrangement Cl and the first luminescent material 210, and downstream of the fifth beam combiner arrangement C5. Further, the fifth beam combiner arrangement C5 may be configured in an optical path between the second beam combiner arrangement C2 and the second luminescent material 220, and in an optical path between the diffuser arrangement 710 and the fourth beam combiner arrangement C4. The optics 500 may further comprise a twelfth reflector R12. The twelfth reflector R12 may be configured (when viewed from the second light generating arrangement 3000, see Fig. 2B) downstream of both the first beam combiner arrangement Cl, and the second beam combiner arrangement C2, and upstream of the third beam combiner arrangement C3. Hence, the second light generating arrangement 3000 may be configured upstream of one or more of (such as all of) the first beam combiner arrangement Cl, the second beam combiner arrangement C2, and the third beam combiner arrangement C3. Further, as depicted in Fig. 2A, the first luminescent material light 211, second luminescent material light 221, and diffused light 711 may be combined (and directed towards the light exit 1500 of the light generating system 1000) in (and / or at) the fourth beam combiner arrangement C4. Hence, the fourth beam combiner arrangement C4 may be comprised by the main beam combiner arrangement 590. That is, the main beam combiner arrangement 590 may comprise the fourth beam combiner arrangement C4.

[0180] Fig. 2B schematically depicts an embodiment of (an operational mode of) the light generating system 1000, wherein the second light generating arrangement 3000 is providing second light generating arrangement light 3001, and the first light generating arrangement 2000 is configured in an off-state state (by the control system 300). Hence, the system light 1001 may (essentially) consist of the second system light 1001b.

[0181] Fig. 2C schematically depicts an embodiment of (an operational mode of) the light generating system 1000, wherein the second light generating arrangement 3000 is providing second light generating arrangement light 3001, and the first light generating arrangement 2000 is providing first light generating arrangement light 2001. Hence, the system light 1001 may comprise the first system light 1001a and the second system light 1001b.

[0182] Fig. 3 A-C schematically depicts an embodiment of a light generating system 1000 configured to generate system light 1001, wherein the light generating system 1000 comprises a first light generating arrangement 2000, a second light generating arrangement 3000, a first luminescent material 210, a second luminescent material 220, a diffuser arrangement 710, a control system 300, and optics 500. The optics 500 may comprise first mirror optics Ml, second mirror optics M2, a third reflector R3, and a main beam combiner arrangement 590. Further, the optics comprise a fourth beam combiner arrangement C4, a fifth beam combiner arrangement C5, and a third beam combiner arrangement C3. The first light generating arrangement 2000 and the second light generating arrangement 3000 may be equal to the first light generating arrangement 2000 and the second light generating arrangement 3000 as defined above. Yet, here, the first light generating arrangement 2000 and the optics 500 are configured to provide (i) via the first mirror optics Ml and the fourth beam combiner arrangement C4 a first part of the first light generating arrangement light 2001 to the first luminescent material 210, (ii) via the second mirror optics M2 and the fifth beam combiner arrangement C5 a second part of the first light generating arrangement light 2001 to the second luminescent material 220, and (iii) via the third reflector R3 and third beam combiner arrangement C3 a third part of the first light generating arrangement light 2001 to the diffuser arrangement 710, wherein a ratio of radiant fluxes of the first part, the second part, and the third part of the first light generating arrangement light 2001 is fixed. Further, the first light generating arrangement 2000 and the optics 500 may be configured such that (i) one of the mirror optics Ml, M2 is configured upstream of two of the three beam combiner arrangements C4,C5,C3, and (ii) another one of the mirror optics Ml, M2 is configured upstream of all three beam combiner arrangements C4,C5,C3. Further yet, the second light generating arrangement 3000 and the optics 500 may be configured to provide one or more of (i) via the first mirror optics Ml (and the fourth beam combiner C4) a first part of the second light generating arrangement light 3001 to the first luminescent material 210, (ii) via the second mirror optics M2 and fifth beam combiner arrangement C5 a second part of the second light generating arrangement light 3001 to the second luminescent material 220, and (iii) via the third beam combiner arrangement C3 a third part of the second light generating arrangement light 3001 to the diffuser arrangement 710. In Fig. 3A-C, the second light generating arrangement 3000 and the optics 500 are especially configured to provide the (full) second light generating arrangement light 3001 to the first luminescent material 210 via the first mirror optics Ml and the fourth beam combiner C4, though other options are possible, as indicated above. In embodiments, the first luminescent material 210, second luminescent material 220, diffuser arrangement 710, and main beam combiner arrangement 590 may be configured to operate as described above (especially as described in relation to the reflective mode).

[0183] As depicted in Fig. 3 A-C, the fourth beam combiner arrangement C4 is configured in an optical path between the first mirror optics Ml and the first luminescent material 210, and is configured downstream of the fifth beam combiner arrangement C5. Further, the fifth beam combiner arrangement C5 is configured in an optical path between the second mirror optics M2 and the second luminescent material 220, and is configured in an optical path between the diffuser arrangement 710 and the fourth beam combiner arrangement C4. In embodiments, the mirror optics Ml, M2 configured upstream of the luminescent materials 210,220 may each comprise one or more of polarizing beam combiners and dichroic beams combiners. Hence, the mirror optics Ml, M2 may be configured to divide the first light generating arrangement light 2001 based on one (or more) of wavelength and polarization. Further, the mirror optics Ml, M2 may be configured to transmit part of the first light generating arrangement light 2001 based on one (or more) of wavelength and polarization. In embodiments, the mirror optics Ml, M2 may further be configured to transmit the second light generating arrangement light 3001, the third light generating arrangement light 4001, and the fourth second light generating arrangement light 5001 based on one (or more) of wavelength and polarization. As such, the first mirror optics Ml are configured to combine the second light generating arrangement light 3001 with the (first part of the) first light generating arrangement light 2001, and the second mirror optics M2 are configured to combine the third light generating arrangement light 4001 with the (second part of the) first light generating arrangement light 2001.

[0184] Fig. 3 A schematically depicts an embodiment of (an operational mode of) the light generating system 1000, wherein the first light generating arrangement 2000 is providing first light generating arrangement light 2001, and the second, third, and fourth light generating arrangements 3000,4000,5000 are configured in an off-state state (by the control system 300). Hence, the system light 1001 may (essentially) consist of the first system light 1001a. Further, here, the first light generating arrangement 2000 is configured to provide its first light generating arrangement light 2001 to the polarization maintaining diffuser 710” via the polarizing beam combiner C32. Fig. 3C schematically depicts an embodiment of (an operational mode of) the light generating system 1000, wherein the first, second, third, and fourth light generating arrangements 2000,3000,4000,5000 are (all) providing their respective light generating arrangement light 2001,3001,4001,5001. Hence, the system light 1001 may comprise the first system light 1001a, the second system light 1001b, the third system light 1001c, and the fourth system light 100 Id.

[0185] Simulations with a red phosphor and a green phosphor and blue light via the diffuser for providing system light with a CCT of 3000 K were obtained with blue pumping of the red phosphor, the green phosphor, and the diffuser arrangement in a ratio (on power basis) of 82:51 :7.8. For a CCT of 4000 K this was 61 :62: 13.7; for a CCT of 6000 K this was 47:71 :23; and for a CCT of 7000 K this was 35:67:27. Blue pumping can be done with one or more of the first light generating arrangement and the second light generating arrangement, and by tuning the relative radiant fluxes of the first light generating arrangement light and second light generating arrangement light.

[0186] Referring to Figs. 1-3, especially the (first) ratio (of the radiant fluxes) of the first part, the second part, and the third part of the first light generating arrangement light may be fixed. Referring to Figs, la, lb, 1c, le, 2a, 2b, and 2c the (second) ratio of radiant fluxes of the first part of the second light generating arrangement light, the second part of the second light generating arrangement light, and the third part of the second light generating arrangement light may be fixed.

[0187] Referring to Figs. Id, 3a, 3b, 3c the ratio of the radiant fluxes of the second light generating arrangement light and the third light generating arrangement light may be fixed. However, alternatively, in such embodiments, the ratio of the radiant fluxes of the second light generating arrangement light and the third light generating arrangement light may be fixed may be controllable. Further, referring to these Figures, the second light generating arrangement and the optics may be configured such that only one (or optionally two, however especially one) of the first luminescent material, the second luminescent material, and the diffuser arrangement may receive second light generating arrangement light. Likewise, this may apply to the third light generating arrangement and the fourth light generating arrangement. In the schematically depicted embodiments of Figs. Id, 3a, 3b, 3c, the first light generating arrangement addresses the first luminescent material, the second light generating arrangement addresses the second luminescent material, and the third light generating arrangement addresses the diffuser arrangement. Other embodiments, however, may also be possible. Note that in Figs, la, lb, 1c, le, 2a, 2b, and 2c the radiant flux of the second light generating arrangement light may be distributed of the first radiant flux of the second light generating arrangement light, the second radiant flux of the second light generating arrangement light, and the third radiant flux of the second light generating arrangement light, whereas in Figs. Id, 3a, 3b, 3c the second light generating arrangement light essentially only propagates to the first luminescent material (and thus the second radiant flux of the second light generating arrangement light and the third radiant flux of the second light generating arrangement light are essentially zero).

[0188] Further, note that in Figs, la, lb, 1c, le, 2a, 2b, and 2c the second part of the first luminescent material light, the second part of the second luminescent material light, and the second part of the diffused light may be combined into a second (portion of the) system light in the main beam combiner arrangement, whereas in Figs. Id, 3a, 3b, 3c the second (portion of the) system light received by the main beam combiner arrangement may essentially consist of first luminescent material light (or “the second part of the first luminescent material light”). Likewise, in Figs. Id, 3a, 3b, 3c the third (portion of the) system light received by the main beam combiner arrangement may essentially consist of second luminescent material light (or “the third part of the second luminescent material light”). Yet, likewise, in Figs. Id, 3a, 3b, 3c the fourth (portion of the) system light received by the main beam combiner arrangement may essentially consist of diffused light (or “the fourth part of the diffused light”). Hence, in these Figs. Id, 3a, 3b, 3c the second light generating arrangement light is directed (via the optics) to only one of the first luminescent material, the second luminescent material, and the diffuser arrangement, but another one than being addressed by the third light generating arrangement and the fourth light generating arrangement.

[0189] When a ratio of radiant fluxes is fixed, this may refer to an operational mode wherein the radiant fluxes defining the ratio will or can essentially not be changed by the control system.

[0190] Hence, whether or not the first luminescent material, the second luminescent material, and the diffuser arrangement receive light from the first light generating arrangement and / or from the second light generating arrangement, and / or from the optional third light generating arrangement, and / or from the fourth light generating arrangement may depend upon the control system and optionally from the choice of the optics.

[0191] Fig. 4 schematically depicts an embodiment of a luminaire 2 comprising the light generating system 1000 as described above. Reference 301 indicates a user interface which may be functionally coupled with the control system 300 comprised by or functionally coupled to the light generating system 1000. Fig. 4 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. 4 schematically depicts embodiments of a lighting device 1200 selected from the group of a lamp 1, a luminaire 2, and a projector device 3, comprising the light generating system 1000 as described herein. In embodiments, such lighting device 1200 may be a lamp 1, a luminaire 2, a projector device 3, a disinfection device, or an optical wireless communication device. Lighting device light escaping from the lighting device 1200 is indicated with reference 1201. Lighting device light 1201 may essentially consist of system light 1001, and may in specific embodiments thus be system light 1001. Reference 1300 refers to a space, such as a room. Reference 1305 refers to a floor and reference 1310 to a ceiling; reference 1307 refers to a wall.

[0192] 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%.

[0193] 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".

[0194] Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein. The devices, apparatus, or systems may herein amongst others be described during operation. As will be clear to the person skilled in the art, the invention is not limited to methods of operation, or devices, apparatus, or systems in operation.

[0195] 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.

[0196] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0197] 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”.

[0198] The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0199] 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.

[0200] 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.

[0201] 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

CLAIMS:

1. A light generating system (1000), configured to generate system light (1001), wherein the light generating system (1000) comprises a first light generating arrangement (2000), a second light generating arrangement (3000), a first luminescent material (210), a second luminescent material (220), a diffuser arrangement (710), a control system (300), and optics (500); wherein: the optics (500) comprise a first beam divider (TRI), a second beam divider (TR2), a first beam combiner arrangement (Cl), a second beam combiner arrangement (C2), a third beam combiner arrangement (C3), and a main beam combiner arrangement (590); the first light generating arrangement (2000) is configured to generate first light generating arrangement light (2001); wherein the first light generating arrangement (2000) comprises one or more first solid state light sources (10) selected from the group of solid state lasers and superluminescent diodes; the first light generating arrangement (2000) and the optics (500) are configured to provide (i) via the first beam divider (TRI) and the first beam combiner arrangement (Cl) a first part of the first light generating arrangement light (2001) to the first luminescent material (210), (ii) via the second beam divider (TR2) and the second beam combiner arrangement (C2) a second part of the first light generating arrangement light (2001) to the second luminescent material (220), and (iii) via the third beam combiner arrangement (C3) a third part of the first light generating arrangement light (2001) to the diffuser arrangement (710), wherein a ratio of radiant fluxes of the first part of the first light generating arrangement light (2001), the second part of the first light generating arrangement light (2001), and the third part of the first light generating arrangement light (2001) is fixed; the first light generating arrangement (2000) and the optics (500) are configured such that (i) one of the beam dividers (TR1,TR2) is configured upstream of two of the three beam combiner arrangements (C1,C2,C3), and (ii) another one of the beam dividers (TR1,TR2) is configured upstream of all three beam combiner arrangements (C1,C2,C3); the second light generating arrangement (3000) is configured to generate second light generating arrangement light (3001); wherein the second light generatingarrangement (3000) comprises one or more second solid state light sources (20 selected from the group of solid state lasers and superluminescent diodes; the second light generating arrangement (3000) and the optics (500) are configured to provide one or more of (i) via the first beam combiner arrangement (Cl) a first part of the second light generating arrangement light (3001) to the first luminescent material (210), (ii) via the second beam combiner arrangement (C2) a second part of the second light generating arrangement light (3001) to the second luminescent material (220), and (iii) via the third beam combiner arrangement (C3) a third part of the second light generating arrangement light (3001) to the diffuser arrangement (710); the first luminescent material (210) is configured to convert (a) at least part of the first light generating arrangement light (2001) received by the first luminescent material (210), and (b) at least part of second light generating arrangement light (3001) received by the first luminescent material (210) into first luminescent material light (211); the second luminescent material (220) is configured to convert (a) at least part of the first light generating arrangement light (2001) received by the second luminescent material (220), and (b) at least part of the second light generating arrangement light (3001) received by the second luminescent material (220) into second luminescent material light (221); the diffuser arrangement (710) is configured to diffuse (a) at least part of the first light generating arrangement light (2001) received by the diffuser arrangement (710), and (b) at least part of the second light generating arrangement light (3001) received by the diffuser arrangement (710) into diffused light (711); the main beam combiner arrangement (590) is configured downstream of the first luminescent material (210), the second luminescent material (220), and the diffuser arrangement (710), and is configured to provide a beam of system light (1001) comprising one or more of the first luminescent material light (211), the second luminescent material light (221), and the diffused light (711); wherein the system light (1001) comprises one or more of (i) a first system light (1001a) resulting only from the first light generating arrangement light (2001), and (ii) a second system light (1001b) resulting only from the second light generating arrangement light (3001); wherein the first system light (1001a) is white light, and wherein in one or more operational modes of the light generating system (1000) the second system light (1001b) has a spectral power distribution different from a spectral power distribution of the first system light (1001a); andthe control system (300) is configured to control the spectral power distribution of the system light (1001) by controlling the first light generating arrangement (2000) and the second light generating arrangement (3000).

2. The light generating system (1000) according to claim 1, wherein the first beam divider (TRI) and the second beam divider (TR2) are transparent specular reflective mirrors, and wherein the system light (1001) has a correlated color temperature selected from the range of 1500-20,000 K, having a variable correlated color temperature of at least 2000 K.

3. The light generating system (1000) according to any one of the preceding claims, wherein the first light generating arrangement (2000) comprises a first laser bank (2100) configured to generate the first light generating arrangement light (2001), and wherein the second light generating arrangement (3000) comprises a second laser bank (3100) configured to generate the second light generating arrangement light (3001).

4. The light generating system (1000) according to any one of the preceding claims, wherein the first light generating arrangement (2000) and the second light generating arrangement (3000) are configured to generate the light generating arrangement light (2001,3001) comprising different polarizations, and wherein the first, second, and third beam combiner arrangements (C1,C2,C3) comprise polarizing beam combiners.

5. The light generating system (1000) according to any one of the preceding claims, wherein the first light generating arrangement light (2001) has a first centroid wavelength ( ci), wherein the second light generating arrangement light (3001) has a second centroid wavelength ( C2), wherein |kci - AC2 > 10 nm, and wherein the first, second, and third beam combiner arrangements (C1,C2,C3) comprise dichroic beam combiners.

6. The light generating system (1000) according to any one of the preceding claims, wherein the optics (500) comprise a third reflector (R3), wherein the third reflector (R3) is configured (i) downstream of both beam dividers (TR1,TR2) and (ii) upstream of one selected from the beam combiner arrangements (C1,C2,C3).

7. The light generating system (1000) according to any one of the preceding claims 1-6, wherein the light generating system (1000) further comprises a fourth beam divider (TR4) and a fifth beam divider (TR5); and wherein the second light generating arrangement (3000) and the optics (500) are configured such that (i) one of the beam dividers (TR4,TR5) is configured upstream of two of the three beam combiner arrangements (C1,C2,C3), and (ii) another one of the beam dividers (TR4,TR5) is configured upstream of all three beam combiner arrangements (C1,C2,C3).

8. The light generating system (1000) according to claim 7, wherein a ratio of radiant fluxes of the first part of the second light generating arrangement light (3001), the second part of the second light generating arrangement light (3001), and the third part of the second light generating arrangement light (3001) is fixed, and wherein the fourth beam divider (TR4) and the fifth beam divider (TR5) are selected from semi-transparent mirrors.

9. The light generating system (1000) according to any one of the preceding claims 7-8, wherein the optics (500) comprise a sixth reflector (R6); wherein the sixth reflector (R6) is configured (i) downstream of both beam dividers (TR4,TR5) and (ii) upstream of one selected from the beam combiner arrangements (C1,C2,C3).

10. The light generating system (1000) according to any one of the preceding claims 1-9, further comprising a third light generating arrangement (4000); wherein: the third light generating arrangement (4000) is configured to generate third light generating arrangement light (4001); wherein the third light generating arrangement (4000) comprises one or more third solid state light sources (30) selected from the group of solid state lasers and superluminescent diodes; the optics (500) comprise a fourth beam combiner arrangement (C4), a fifth beam combiner arrangement (C5), and a sixth beam combiner arrangement (C6); the third light generating arrangement (4000) and the optics (500) are configured to provide (i) via the fourth beam combiner arrangement (C4) a first part of the third light generating arrangement light (4001) to the first luminescent material (210), (ii) via the fifth beam combiner arrangement (C5) a second part of the third light generating arrangement light (4001) to the second luminescent material (220), and (iii) via the sixth beam combiner arrangement (C6) a third part of the third light generating arrangement light (4001) to the diffuser arrangement (710);the first luminescent material (210) is configured to convert at least part of the first part of the third light generating arrangement light (4001) received by the first luminescent material (210) into first luminescent material light (211); the second luminescent material (220) is configured to convert at least part of the second part of the third light generating arrangement light (4001) received by the second luminescent material (220) into second luminescent material light (221); the diffuser arrangement (710) is configured to diffuse at least part of the third part of the third light generating arrangement light (4001) received by the diffuser arrangement (710) into diffused light (711); and the control system (300) is configured to control the spectral power distribution of the system light (1001) by controlling the first light generating arrangement (2000), the second light generating arrangement (3000), and the third light generating arrangement (4000).

11. The light generating system (1000) according to any one of the preceding claims 1-6, further comprising a third light generating arrangement (4000), and a fourth light generating arrangement (5000), wherein: the third light generating arrangement (4000) is configured to generate third light generating arrangement light (4001); wherein the third light generating arrangement (4000) comprises one or more third solid state light sources (30) selected from the group of solid state lasers and superluminescent diodes; the fourth light generating arrangement (5000) is configured to generate fourth light generating arrangement light (5001); wherein the fourth light generating arrangement (5000) comprises one or more fourth solid state light sources (40) selected from the group of solid state lasers and superluminescent diodes;(i) one of the second light generating arrangement (3000), the third light generating arrangement (4000), and the fourth light generating arrangement (5000), is configured to provide its light generating arrangement light (3001,4001,5001) via the first beam combiner arrangement (Cl) to the first luminescent material (210), (ii) another one of the second light generating arrangement (3000), the third light generating arrangement (4000), and the fourth light generating arrangement (5000), is configured to provide its light generating arrangement light (3001,4001,5001) via the second beam combiner arrangement (C2) to the second luminescent material (220), and (iii) yet another one of the second light generating arrangement (3000), the third light generating arrangement (4000), and the fourthlight generating arrangement (5000), is configured to provide its light generating arrangement light (3001,4001,5001) via the third beam combiner arrangement (C3) to the diffuser arrangement (710); and the control system (300) is configured to control the spectral power distribution of the system light (1001) by controlling the first light generating arrangement (2000), the second light generating arrangement (3000), the third light generating arrangement (4000), and the fourth light generating arrangement (5000).

12. The light generating system (1000) according to claim 10, wherein: the first light generating arrangement (2000) and the third light generating arrangement (4000) are configured to generate the light generating arrangement light (2001,4001) having different spectral power distributions, but comprising the same polarizations; the fourth beam combiner arrangement (C4) is configured downstream of the first beam divider (TRI) and upstream of the first beam combiner arrangement (Cl); the fifth beam combiner arrangement (C5) is configured downstream of the second beam divider (TR2) and upstream of the second beam combiner arrangement (C2); and the sixth beam combiner arrangement (C6) is configured downstream of the third reflector (R3) and upstream of the third beam combiner arrangement (C3); and the fourth, fifth, and sixth beam combiner arrangements (C4,C5,C6) comprise dichroic beam combiners.

13. The light generating system (1000) according to any one of the preceding claims 1-12, and according to claim 4, wherein: the following applies: (a) the first luminescent material (210) is operated in the reflective mode, (b) the second luminescent material (220) is operated in the reflective mode, and (c) the diffuser arrangement (710) is operated in the reflective mode; the diffuser arrangement (710) comprises two polarization maintaining diffusers (710’, 710”); the beam combiner arrangements (C1,C2) configured upstream of the luminescent materials (210,220) comprise polarizing beam combiners, and the third beam combiner arrangement (C3) configured upstream of the two polarization maintaining diffusers (710’, 710”) comprises two polarizing beam combiners (C31,C32);the light generating system (1000) further comprises two polarization changing elements (810), configured upstream of the respective two polarization maintaining diffusers (710’, 710”), and configured downstream of the respective two polarizing beam combiners (C31,C32); the light generating system (1000) further comprises a fourth beam combiner arrangement (C4) and a fifth beam combiner arrangement (C5), wherein: the fourth beam combiner arrangement (C4) is configured in an optical path between the first beam combiner arrangement (Cl) and the first luminescent material (210), and is configured downstream of the fifth beam combiner arrangement (C5); the fifth beam combiner arrangement (C5) is configured in an optical path between the second beam combiner arrangement (C2) and the second luminescent material (220), and is configured in an optical path between the diffuser arrangement (710) and the fourth beam combiner arrangement (C4); the optics (500) comprise a twelfth reflector (R12); wherein the twelfth reflector (R12) is configured (i) downstream of both the first beam combiner (Cl) and the second beam combiner (C2) and (ii) upstream of the third beam combiner arrangements (C3); the second light generating arrangement (3000) is configured upstream of one or more of the first beam combiner (Cl), the second beam combiner (C2), and the third beam combiner arrangements (C3); and the main beam combiner arrangement (590) comprises the fourth beam combiner arrangement (C4).

14. The light generating system (1000) according to 13, wherein the second light generating arrangement (3000) is configured upstream of the first beam combiner (Cl), the second beam combiner (C2), and the third beam combiner arrangements (C3).

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

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