Improved artificial sunroof

Abstract

The invention may provide a light generating system (1000) comprising a lighting module (1500); wherein the lighting module (1500) comprises a first light generating device (110), a second light generating device (120) and a light exit window (1100); wherein the light generating system (1000) is configured to provide the lighting module light (1501) via the light exit window (1100); wherein the light exit window (1100) has a window perimeter (P0) and comprises: (i) a first light emitting surface portion (1110) having a first perimeter (P1), and (ii) a second light emitting surface portion (1120) having a second perimeter (P2); the second light emitting surface portion (1120) has an ellipse-like cross-sectional shape; wherein the first light generating device (110) is configured to generate the first device light (111) via the first light emitting surface portion (1110); the second light generating device (120) is configured to generate second device light (121) via the second light emitting surface portion (1120); wherein the first device light (111) is white light having a first correlated color temperature CCT1 of at most 8000 K; the second device light (121) is (i) blue light or (ii) white light having a second correlated color temperature CCT2 of at least 5000 K; wherein when both the first device light (111) and the second device light (121) are white light, then CCT2-CCT1 > = 500K; and wherein the first perimeter (P1) and the second perimeter (P2) both contact the window perimeter (P0) or partially coincide with the window perimeter (P0).

Description

Technical Field

[0001] The present invention relates to a light generating system and an indoor space comprising such a light generating system. Background Art

[0002] Light-emitting modules are known in the art. For example, US2013249407 describes a first LED group comprising a plurality of LEDs regularly arranged in a toric shape on a circumference of the center of an approximately rectangular substrate formed of ceramic. Furthermore, the first LED group comprising the plurality of LEDs is completely covered with a sealing member in a toric shape. Furthermore, a second LED group comprising the plurality of LEDs is regularly arranged in a grid shape near the center of the approximately rectangular substrate. Furthermore, the LED group comprising the plurality of LEDs is completely covered with a sealing member. Furthermore, the sealing member completely covers the inner side of the toric portion of the first region. Summary of the Invention

[0003] In today's era, people may have to spend a lot of time indoors, especially in situations where they may have to work or go to school in a home environment. Therefore, being close to or exposed to natural daylight in such an environment is very beneficial. Natural daylight has a positive impact on personal health, especially in the production of vitamin D. In addition, natural light may become increasingly important in the future, with the current trend seeming to promote indoor work. One solution may be to use artificial skylights, which can provide the illusion of sunlight. Artificial skylights can provide a simulation of at least some aspects of an outdoor environment in an indoor environment. Due to the beneficial properties of artificial skylights for human well-being, the demand for artificial skylights is increasing. Since people tend to spend most of their day indoors (which may keep them away from natural daylight), there is interest in creating artificial light that can simulate the appearance and light of a natural window or skylight. Therefore, it seems desirable to have an (improved) artificial skylight, or other type of lighting device or light generating system, with an enhanced natural appearance.

[0004] It is therefore an aspect of the present invention to provide an alternative system for generating light which preferably further at least partially obviates one or more of the above disadvantages.It may be an object of the present invention to overcome or ameliorate at least one disadvantage of the prior art, or to provide a useful alternative.

[0005] Therefore, in a first aspect, the present invention provides a light generating system comprising a lighting module ("module"), such as an artificial skylight. In particular, the lighting module may comprise a first light generating device, a second light generating device, and a light exit window. In embodiments, the light generating system may be configured to provide lighting module light via the light exit window. In particular, the light exit window may have a window perimeter (P0) and may comprise: (i) a first light emitting surface portion having a first perimeter (P1), and (ii) a second light emitting surface portion having a second perimeter (P2). Furthermore, in embodiments, the second light emitting surface portion may have a cross-sectional shape similar to an ellipse. In embodiments, the first light generating device may be configured to generate first device light via the first light emitting surface portion. In particular, the second light generating device may be configured to generate second device light via the second light emitting surface portion. Furthermore, in embodiments, the first device light may be white light having a first correlated color temperature (CCT1) of a maximum of 8000K. The second device light may in particular be (i) blue light or (ii) white light having a second correlated color temperature (CCT2) of at least 5000K. In an embodiment, when the first device light and the second device light are both white light, then it can be particularly applied that CCT2-CCT1≥500K. In an embodiment, both the first perimeter (P1) and the second perimeter (P2) may contact the window perimeter (P0) or partially overlap with the window perimeter (P0). Therefore, in a specific embodiment, the present invention provides a light generating system comprising a lighting module; wherein the lighting module comprises a first light generating device, a second light generating device and a light exit window; wherein the light generating system is configured to provide the lighting module light via the light exit window; wherein the light exit window has a window perimeter (P0) and comprises: (i) a first light emitting surface portion having a first perimeter (P1), and (ii) a second light emitting surface portion having a second perimeter (P2); the second light emitting surface portion has a cross-sectional shape similar to an ellipse; wherein the first light generating device is configured to generate light via the first light emitting surface portion A first device light; a second light generating device is configured to generate a second device light via a second light emitting surface portion; wherein the first device light is white light having a first correlated color temperature CCT1 of a maximum of 8000K; the second device light is (i) blue light or (ii) white light having a second correlated color temperature CCT2 of at least 5000K; wherein when the first device light (111) and the second device light (121) are both white light, then CCT2-CCT1≥500K; and wherein the first perimeter (P1) and the second perimeter (P2) both contact the window perimeter (P0) or partially overlap with the window perimeter (P0).

[0006] In this way, the present invention can provide an improved lighting module, such as an artificial skylight. Using this system, it is possible, among other things, to create a (virtual) connection with the outside world by imitating natural daylight from a (simulated) lighting module with two different spectral power distributions, such as, for example, to simulate natural bluish light scattered from the sky and sunlight. In addition, by controlling the spectral power distribution (such as controlling) the color temperature, the illusion of different kinds of weather conditions can be provided, for example, for cloudy days. The present invention can be used in spaces where access to daylight is limited or absent (such as office spaces, reception areas), and in particular in spaces where access to natural light is not possible (such as underground spaces and control rooms). The present invention can be used to help people maintain a connection with the dynamic natural world outside, thereby making indoor environments with little or no daylight entering more attractive by creating the real illusion of a skylight (or "roof light") or window. In addition, the present invention allows for relatively shallow solutions, while systems of the prior art may have considerable depth.

[0007] As previously described, in embodiments, the present invention provides a light generating system comprising a lighting module. In embodiments, the lighting module can provide light that mimics the natural light observed on a sunny day. This can specifically include a combination of blue light generated by scattered sunlight in the atmosphere and white light that can simulate direct sunlight. Alternatively, in embodiments, the lighting module can provide a combination of white light at two different color temperatures. Thus, in embodiments, the lighting module can provide light that mimics such a natural skylight. Furthermore, in specific embodiments, the lighting module can provide light that mimics the natural light observed on an overcast day, or during sunset or sunrise.

[0008] In this document, a lighting module may be specifically designed as an artificial skylight, i.e., a lighting module functionally coupled to a ceiling. However, other applications (such as an artificial window functionally coupled to a wall) are also contemplated herein. Therefore, the term "lighting module" may refer to an artificial skylight in some embodiments (and may refer to another type of lighting module in other specific embodiments).

[0009] In particular, the term "artificial skylight" (which may also be indicated as "artificial rooflight") may, in embodiments, be a window-like artificial light generating device. Such an artificial skylight may, for example, form part of a ceiling (or roof) (of a building) or may be functionally coupled to a ceiling (or roof), for example, to simulate daylight.

[0010] As used herein, the term "functionally coupled" may refer, in embodiments, to a physical or mechanical connection between at least two elements, such as via one or more of a screw, solder, adhesive, melt connection, click connection, and the like. The terms "physically connected" and "mechanically connected" may be used interchangeably herein. The terms "physically connected" and "mechanically connected" may therefore also refer to an adhesive connection. Alternatively or additionally, the term "functionally coupled" may refer, in embodiments, to an electrically conductive connection between at least two connections.

[0011] In particular, "functionally coupled" in this context may mean that the lighting module is associated with a wall or ceiling. Furthermore, in this context, this may mean that the lighting module is coupled to an electrical power source, such as mains electricity.

[0012] In embodiments, the lighting module may include a first light generating device, a second light generating device, and a light exit window. Specifically, the light generating system may be configured to provide lighting module light via the light exit window. Therefore, in embodiments, the light exit window may be light-transmissive. The light exit window may comprise a light-transmissive material such as glass, PMMA, PET, PC, etc. Such embodiments are discussed further below.

[0013] In particular, in an embodiment, the light generating system may provide the lighting module light via the light exit window, which means that the light generating system may provide light from either (or both) the first or the second light emitting surface portion, in particular from both.

[0014] In an embodiment, the light exit window may have a window perimeter (P0). Furthermore, in an embodiment, the light exit window may include a first light emitting surface portion having a first perimeter (P1) and a second light emitting surface portion having a second perimeter (P2). In particular, in an embodiment, the window perimeter may be substantially defined by a portion of the first perimeter (P1) and a portion of the second perimeter (P2). Furthermore, in particular in an embodiment, portions of the first perimeter (P1) and the second perimeter (P2) that do not contribute to the window perimeter may be substantially overlapping portions. Therefore, in an embodiment, both the first perimeter (P1) and the second perimeter (P2) may contact the window perimeter (P0) or partially overlap with the window perimeter (P0).

[0015] The above-mentioned two emitting surface portions (i.e. the first emitting surface portion and the second emitting surface portion) can, in an embodiment, divide the surface of the light exit window into essentially two areas, each area having an associated perimeter and surface area. Typically, in an embodiment, the first emitting surface portion and the second emitting surface portion can in particular divide the light exit window into two different areas, and therefore, the first emitting surface portion and the second emitting surface portion can in particular share a part of their boundary with the light exit window.

[0016] In an embodiment, the second light emitting surface portion may have a cross-sectional shape similar to an ellipse. An ellipse may be a closed shape around two foci, wherein the range of the ellipse may be limited by a major axis and a minor axis. In an embodiment, the second light emitting surface portion may particularly have a cross-sectional shape similar to an ellipse, that is, it may have a shape in which the minor axis and the major axis may be limited, but may not necessarily have a smooth boundary. In particular, the end of the cross-sectional shape similar to an ellipse may be a pointed end (which is opposite to the smooth boundary of an ellipse), for example also referred to as a lens shape. Such an embodiment is further discussed below. In addition, the cross-sectional shape similar to an ellipse may have: a first portion of its perimeter, the first portion contacting the window perimeter (P0) or partially coinciding with the window perimeter (P0); and a second portion of its perimeter, the second portion contacting the first perimeter (P1) or partially coinciding with the first perimeter (P1) of the first light emitting surface portion.

[0017] As described above, in embodiments, the first light generating device may be configured to generate a first device light (which may escape) via the first light emitting surface portion. In embodiments, the second light generating device may be configured to generate a second device light (which may escape) via the second light emitting surface portion.

[0018] In an embodiment, the first light emitting surface portion and the second light emitting surface portion may be separated so that they are not optically connected to each other. Here, mutual optical connection between two elements may refer to light exchange (or transmission) between the two elements or from one element to another element. Therefore, in an embodiment, the light escaping from the first light emitting surface portion may not include the second device light, and the light escaping from the second light emitting surface portion may not include the first device light. Downstream of the light exit window, the light beams of the first device light and the second device light may, for example, at least partially overlap at a certain distance from the exit window. Therefore, in the far field, the light beams of the first device light and the second device light may at least partially overlap. However, substantially no first device light can escape from the second light emitting surface, and substantially no second device light can escape from the first light emitting surface.

[0019] Thus, in an embodiment, substantially all first device light escaping from the light generating system escapes via the first light emitting surface.Similarly, substantially all second device light escaping from the light generating system escapes via the second light emitting surface.

[0020] In particular, in an embodiment, the light generating system can be configured to generate system light comprising at least a portion of the first device light (emitted from the first light emitting surface) and at least a portion of the second device light (emitted from the second light emitting surface). Thus, in an embodiment, the first device light and the second device light can in particular be generated simultaneously.

[0021] In an embodiment, there may be a reflective separator between the first light emitting surface portion and the second light emitting surface portion to prevent mutual optical communication (between the first light emitting surface portion and the second light emitting surface portion).

[0022] Therefore, in an embodiment, the light generating system may provide the lighting module light via the light exit window. In particular, the lighting module light may include the first device light, the second device light, or both (depending on the operating mode). However, in particular, in the operating mode, the lighting module light includes the first device light and the second device light.

[0023] In an embodiment, the first device light may be white light having a first correlated color temperature CCT1 of at most 8000K, such as at most 7000K, particularly at most 6000K, more particularly at most 5000K. Furthermore, in an embodiment, the second device light may be (i) blue light or (ii) white light having a second correlated color temperature CCT2 of at least 5000K, such as at least 6000K, such as particularly at least about 8000K. In further embodiments, it may be even higher, such as at least about 10000K, particularly at least 12000K. CCT may refer to correlated color temperature herein, which may be a color temperature scale for classifying the color of light emitted by a light generating device, as is known in the art. In an embodiment, 1800K≤CCT1≤8000K, more particularly 1800K≤CCT1≤5000K. Furthermore, in an embodiment, 5000K≤CCT2≤20000K, more particularly 6500K≤CCT2≤15000K. The second device light may also be a combination of blue light and white light. Note that white light with a high CCT may (already) be bluish.

[0024] Note that even if the first correlated color temperature CCT1 is at most 8000K and the second correlated color temperature CCT2 is at least 5000K, CCT1 and CCT2 are selected such that CCT2 > CCT1. Thus, using this combination of the first device light and the second device light, the light generating system can provide lighting module light in embodiments. However, in embodiments, when (both) the first device light and the second device light can be white light, then CCT2 - CCT1 ≥ 500K, such as CCT2 - CCT1 ≥ 1000K, and in particular CCT2 - CCT1 ≥ 2000K. In a specific embodiment, CCT2 - CCT1 ≥ 3000K, such as CCT2 - CCT1 ≥ 4000K, and more particularly CCT2 - CCT1 ≥ 5000K. In this way, the light generating device can specifically provide lighting module light that includes at least two lights of different CCTs.

[0025] The term "blue light" or "blue emission" and similar terms may particularly relate to light having a wavelength in the range of about 440-490 nm (including some violet and cyan hues). In a specific embodiment, the blue light may have a centroid wavelength in the range of 440-490 nm. The term "white light" and similar terms are known to those skilled in the art in this document. It may particularly relate to light having a correlated color temperature (CCT) between about 1800 K and 20,000 K, for example between 2,000 and 20,000 K, in particular 2,700-20,000 K, and for general lighting, in particular in the range of about 2,000-7,000 K, such as in the range of 2,700 K and 6,500 K.

[0026] Thus, in embodiments, the first device light and the second device light can both be white light (having different CCTs), while in other embodiments, the first device light is white light and the second device light comprises blue light. In particular, in embodiments, the second device light can have a dominant wavelength selected from the range of 400-490 nm (such as 420-470 nm).

[0027] Furthermore, in embodiments, the light generating system may include a housing, wherein the housing may include one or more walls. In particular, one of the walls of the housing may be light-transmissive. More particularly, such a wall may include a light exit window. As described above, the light exit window may be light-transmissive (or translucent). Still further, in embodiments, the light exit window may comprise a light-transmissive material.

[0028] As known to those skilled in the art, a light-transmitting material is a material that allows light to pass through it. A light-transmitting material can transmit light, wherein, in an embodiment, the transmittance of light passing through the light-transmitting material in a direction perpendicular to its surface can be at least 50%, such as at least about 75%, such as at least 90% in an embodiment, or even more particularly at least about 100%. Furthermore, in an embodiment, the light-transmitting material can be a material such as glass or a light-transmitting polymeric material such as PMMA, see further below.

[0029] The light-transmitting material may include one or more materials selected from the group consisting of light-transmitting organic materials, such as selected from the group consisting of: PE (polyethylene), PP (polypropylene), PEN (polyethylene naphthalate), PC (polycarbonate), polyurethane (PU), polymethyl methacrylate (PMA), polymethyl methacrylate (PMMA) (Plexiglas or Perspex), polymethacrylimide (PMI), polymethacrylimide (PMMI), styrene acrylonitrile resin (SAN), cellulose acetate butyrate (CAB), silicone resin, polyvinyl chloride (PVC), polyethylene terephthalate (PET), including in one embodiment (PETG) (ethylene glycol-modified polyethylene terephthalate), PDMS (polydimethylsiloxane) and COC (cyclic olefin copolymer). In particular, the light-transmitting material may comprise an aromatic polyester or a copolymer thereof, such as, for example, one or more of the following: polycarbonate (PC), polymethyl methacrylate (P(M)MA), polyglycolide or polyglycolic acid (PGA), polylactic acid (PLA), polycaprolactone (PCL), polyethylene adipate (PEA), polyhydroxyalkanoate (PHA), polyhydroxybutyrate (PHB), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN). In particular, the light-transmitting material may comprise polyethylene terephthalate (PET). Therefore, the light-transmitting material is in particular a polymeric light-transmitting material. However, in another embodiment, the light-transmitting material may comprise an inorganic material. In particular, the inorganic light-transmitting material may be selected from the group consisting of glass, (fused) quartz, a light-transmitting ceramic material, and a silicone resin. A hybrid material comprising both an inorganic part and an organic part may also be applied. In particular, the light-transmitting material comprises one or more of PMMA, transparent PC or glass.

[0030] In embodiments, the light exit window can be translucent. In particular, the light exit window can be light-diffusing / scattering. This can prevent an observer from seeing into the housing through the light exit window from the outside, while allowing light to escape from the housing. Therefore, in particular, in embodiments, the light exit window is not completely transparent, as it can be visually useful if at least a portion of the light escaping the system is scattered in the light exit window.

[0031] Other walls of the housing, such as side walls and / or bottom (wall), can be reflective in embodiments, such as, in particular, diffusely reflective. Furthermore, the housing can include one or more inner walls that can be used to (optically) separate the space upstream of the first light-emitting surface portion from the space upstream of the second light-emitting surface portion. In this way, substantially no first device light can escape from the second light-emitting surface, and substantially no second device light can escape from the first light-emitting surface.

[0032] As mentioned above, the housing can be relatively shallow. Thus, a skylight, for example, can be obtained using a relatively shallow device. For example, the height can be a few millimeters to a few centimeters or more, such as selected from the range of 1-100 mm, such as 2-100 mm, such as 4-100 mm, such as 4-80 mm, such as a maximum of 50 mm, such as, for example, in the range of 5-20 mm.

[0033] As mentioned above, the light exit window may comprise two light emitting surface portions, a first light emitting surface portion and a second light emitting surface portion.

[0034] In particular, in an embodiment, the second light emitting surface portion (comprised by the light exit window) may have an ellipse-like shape. The ellipse-like shape is particularly similar to an ellipse in certain features, such as having an elongated cross-sectional shape characterized by a major axis and a minor axis. In addition, in an embodiment, the ellipse-like shape may be surrounded by one or more curved boundaries. However, in an embodiment, the ellipse-like shape may include two tips. In an embodiment, this may distinguish the ellipse-like shape from the ellipse. In an embodiment, the ellipse-like shape may be defined as the shape of the common area between the intersection of two circles. Therefore, the shape may be defined in particular by two curves (i.e., arcs from two circles) and may have a sharp tip (i.e., at the two intersections of the two circles).

[0035] In an embodiment, the second light-emitting surface portion may have a lens-like cross-sectional shape. As described above, a lens may be a convex shape defined by two arcs connected at their endpoints. Alternatively, in an embodiment, the same shape may be formed by the union of two circular disks. Note that in an embodiment, the two arcs that can form a lens-like cross-sectional shape may be a shared area formed by the intersection of two circles. In particular, the radii of the two circles may be different. Therefore, the curvature of the arc that can form the lens-like cross-sectional shape may be different. Therefore, in some embodiments, the lens-like cross-sectional shape may have a symmetry plane passing through the two tips of the lens-like cross-sectional shape. However, in other embodiments, the lens-like shape may not have a symmetry plane passing through the two tips of the lens-like cross-sectional shape. Further, in an embodiment, the lens-like shape may also be a shared area formed by the intersection of other curved shapes (such as oval, elliptical, egg-shaped cross-sections, etc.). In addition, in an embodiment, the light exit window may have a circular cross-sectional shape. However, in other embodiments, the light exit window may include a cross-sectional shape such as oval, ellipsoidal, egg-shaped, etc.

[0036] In an embodiment, the light exit window may have a symmetry plane (PS). In particular, the symmetry plane (PS) may be a flat surface that bisects the light exit window, such that the two halves of the light exit window are mirror images. More particularly, such a bisection may provide two halves, each comprising a portion (both) of the first and second light emitting surface portions. Thus, in a specific embodiment, the light exit window has a circular cross-sectional shape; wherein the light exit window has a symmetry plane (PS) that intersects both the first and second light emitting surface portions.

[0037] In an embodiment, the light exit window can in particular be flat. Specifically, the light exit window can have a surface area SA0. Further, in an embodiment, the first light-emitting surface portion can include a first surface area SA1. Further, in an embodiment, the second light-emitting surface portion can include a second surface area SA2. Generally, in an embodiment, the second surface area can be smaller than the first surface area. This can be advantageous when providing light for the lighting module, because the larger first surface area can provide the advantage of coupling out more first device light (compared to the second device light). Thus, in an embodiment, SA2 < 2*SA1, for example SA2 < SA1, especially SA2 < 0.5*SA1. Further, in an embodiment, the total surface area of the light exit window can be completely comprised of the first surface area SA1 and the second surface area SA2. Specifically, SA0 = SA1 + SA2. Note that in an embodiment, these aforementioned surface areas can be defined as not including the regions that occupy the boundaries of the surface areas SA1 and SA2. However, in other embodiments, the first light-emitting surface portion and the second light-emitting surface portion can be separated by a reflective (or opaque) separator. In such an embodiment, most of the surface area of the light exit window can be comprised of the first light-emitting surface portion and the second light-emitting surface portion, especially 0.98*SA0 ≤ SA1 + SA2, such as 0.95*SA0 ≤ SA1 + SA2, more especially 0.9*SA0 ≤ SA1 + SA2. Thus, especially 0.9*SA0 ≤ SA1 + SA2 ≤ SA0.

[0038] Further, in an embodiment, the relationship between the first light-emitting surface portion and the second light-emitting surface portion can be defined with respect to their longest extent. In an embodiment, (when the light exit window is circular) the longest extent of the first light-emitting surface portion can be the diameter of the light exit window. In other embodiments, (in the case where the light exit window has a non-circular cross-section) the longest extent can be defined as the longest distance between two points on the boundary of the first light-emitting surface portion.

[0039] In an embodiment, the longest extent of the first light-emitting surface portion can be referred to as a first length L1. In an embodiment, the longest extent of the second light-emitting surface portion can be the major axis of a shape that is similar to an ellipse (or a cross-sectional shape that is similar to a lens). More particularly, the longest extent of the second light-emitting surface portion can be referred to as a second length L2.

[0040] Note that, in embodiments, the first length L1 and the second length L2 can be specifically defined as parallel. Further, in embodiments, L2 ≤ L1, such as L2 ≤ 0.4*L1, especially L2 ≤ 0.25*L1. Such embodiments can provide the advantage of coupling out more light of the first device as compared to the light of the second device. Thus, in a specific embodiment, the first light-emitting surface portion has a first surface area SA1; wherein the second light-emitting surface portion has a second surface area SA2; wherein SA2 < SA1; wherein L2 ≤ 0.4*L1; wherein the light exit window has a surface area SA0, wherein SA0 = SA1 + SA2.

[0041] As described above, it may be desirable to provide embodiments where the first device light is white light and the second device light is blue light or white light (although this can also include combinations of blue light or white light). Thus, in embodiments, the second device light can be selected from a cooler color temperature, which is opposite to the first device light that can be selected from a warmer color temperature.

[0042] Specifically, the first correlated color temperature CCT1 can be selected from the range of 2700K ≤ CCT1 ≤ 6500K, such as 3500K ≤ CCT1 ≤ 6500K, especially 5000K ≤ CCT1 ≤ 6500K. Further, in embodiments, CCT1 can be selected from the range of 2700K ≤ CCT1 ≤ 6000K, such as 2700K ≤ CCT1 ≤ 5000K, especially 2700K ≤ CCT1 ≤ 3500K.

[0043] Specifically, in embodiments, CCT2 can be selected from the range of CCT2 ≥ 6500K, especially CCT2 ≥ 8000K, more especially CCT2 ≥ 12000K. Further, in embodiments, CCT2 can be selected from the range of 6500K ≤ CCT2 ≤ 20000K, such as 8500K ≤ CCT2 ≤ 20000K, especially 8500K ≤ CCT2 ≤ 15000K. In a specific embodiment, 2700K ≤ CCT1 ≤ 6500K, and CCT2 ≥ 6500K. As described above, some embodiments can include a first device light that can be white light and a second device light that can (also) be white light. In such embodiments, it may be advantageous to provide light including two correlated color temperatures that vary according to CCT2 - CCT1 ≥ 1000K, such as CCT2 - CCT1 ≥ 2000K, especially CCT2 - CCT1 ≥ 4000K, more especially CCT2 - CCT1 ≥ 8000K. Thus, in this way, lighting module light can be provided such that the lighting module light includes light having two different color temperatures.

[0044] In embodiments, the light generating system may include a first light chamber. In particular, the first light chamber may be an enclosed space, wherein in embodiments, one of the walls may be a first light emitting surface portion. Furthermore, in embodiments, the other walls of the first light chamber may be particularly reflective (for the corresponding device light). Furthermore, in embodiments, the light generating system may include a second light chamber. In particular, the second light chamber may (also) be an enclosed space, wherein in embodiments, one of the walls may be a second light emitting surface portion. Furthermore, in embodiments, the other walls of the light emitting surface portion may be reflective (for the corresponding device light).

[0045] In an embodiment, at least a portion of a first light-generating device may be included in a first light chamber. Similarly, in an embodiment, at least a portion of a second light-generating device may be included in a second light chamber. Thus, first device light (generated by the first light-generating device) may be coupled out of the first light chamber via the first light-emitting surface portion. Similarly, second device light (generated by the second light-generating device) may be coupled out of the second light chamber via the second light-emitting surface portion.

[0046] Furthermore, in embodiments, the first light chamber may not be in optical communication with the second light chamber (see also above). In embodiments, they may be separate chambers separated by an opaque wall or a reflective wall. In particular, the first light chamber and the second light chamber may be separated by a (diffuse) reflector. Thus, in a specific embodiment, the light generating device may include (i) a first light chamber comprising a first light emitting surface portion and surrounding at least a portion of the first light generating device, and (ii) a second light chamber comprising a second light emitting surface portion and surrounding at least a portion of the second light generating device; wherein the light chambers are not configured to be in optical communication with each other.

[0047] In an embodiment, the light exit window may include an optical diffuser. The optical diffuser may in particular provide diffuse light (such as by means of scattering). In particular, the scattering of light may disrupt the alignment of the light waves, resulting in pseudo-random variations in the light phase and thus providing diffuse light. A beam of light may be desirable in workplaces such as offices, schools, homes, etc. However, diffuse light may (also) be desirable due to its soothing (i.e. less glaring) quality compared to exposure to a beam of light. Furthermore, diffuse light may be particularly useful in illuminating a space more evenly. In such an embodiment, the optical diffuser may include (both) a first luminous surface portion and a second luminous surface portion.

[0048] In an embodiment, the optical diffuser may include scattering particles embedded therein. Such particles may, in particular, scatter an incident light beam and thus provide diffuse light. Therefore, in a specific embodiment, the light exit window comprises an optical diffuser, wherein the optical diffuser comprises a first luminous surface portion and a second luminous surface portion.

[0049] In an embodiment, the first light chamber may include a first light generating device. In another embodiment, the first light chamber may include a plurality of first light generating devices. Similarly, in an embodiment, the second light chamber may include a second light generating device. In another embodiment, the second light chamber may include a plurality of second light generating devices. Thus, in specific embodiments, the first light chamber includes at least a portion of the plurality of first light generating devices, and / or the second light chamber includes at least a portion of the plurality of second light generating devices.

[0050] In an embodiment, the light generating device may comprise a first light guide. In particular, the first light guide may comprise a first light emitting surface portion. Furthermore, in an embodiment, the light generating system may comprise a second light guide. In particular, the second light guide may comprise a second light emitting surface portion. In an embodiment, the first light guide may be configured to be in a light receiving relationship with the first light generating device. Furthermore, in an embodiment, the first light guide may comprise a first light emitting light guide surface, from which the first device light is emitted during operation of the first light generating device. In particular, the first light emitting surface portion may be configured to be in a light receiving relationship with the first light emitting light guide surface, or may comprise the first light emitting light guide surface.

[0051] Similarly, in an embodiment, the second light guide may be configured to be in a light receiving relationship with the second light generating device. In particular, the second light guide may comprise a second light emitting light guide surface, from which second device light may be emitted during operation of the second light generating device. In particular, the second light emitting surface portion may be configured to be in a light receiving relationship with the second light emitting light guide surface, or may comprise a second light emitting light guide surface. In an embodiment, the light guides may not be configured to be optically connected to each other. In particular, the first light guide and the second light guide may not be connected to each other. Embodiments such as this may provide flexibility in the physical position in which the first (or second) light generating device may be configured relative to the light exit window. In an embodiment, the light guides may be separated by a specular reflector. However, in other embodiments, the light guides may (also) be separated by a diffuse reflector. Thus, in a particular embodiment, a light generating system comprises a first light guide and a second light guide, wherein the first light guide is configured to be in a light receiving relationship with a first light generating device; wherein the first light guide comprises a first light emitting light guide surface from which light of the first device is emitted during operation of the first light generating device; wherein the first light emitting surface portion is configured to be in a light receiving relationship with the first light emitting light guide surface, or comprises the first light emitting light guide surface; wherein the second light guide is configured to be in a light receiving relationship with the second light generating device; wherein the second light guide comprises a second light emitting light guide surface from which light of the second device is emitted during operation of the second light generating device; wherein the second light emitting surface portion is configured to be in a light receiving relationship with the second light emitting light guide surface, or comprises the second light emitting light guide surface; and wherein the light guides are not configured to be in optical communication with each other. In an embodiment, the first light guide and the second light guide may comprise light outcoupling structures to couple the first device light and the second device light out of the respective first light guide and the second light guide.

[0052] As described above, the first device light may escape from the first light emitting surface portion, and the second device light may escape from the second light emitting surface portion. However, in specific embodiments, in another operating mode of the light generating system, light different from the first device light may be emitted from the first light emitting surface portion, and / or light different from the second device light may be emitted from the second light emitting surface portion. For example, in an operating mode of the light generating system, the second device light may escape from the first light emitting surface portion, and the first device light may escape from the second light emitting surface portion. Alternatively or additionally, in another operating mode of the light generating system, the first device light may escape from the first light emitting surface portion, and light other than the second device light may escape from the second light emitting surface portion. Alternatively or additionally, in another operating mode of the light generating system, light different from the first device light may escape from the first light emitting surface portion, and the second device light may escape from the second light emitting surface portion.

[0053] In an embodiment, the light generating system may comprise an array of light generating devices, wherein the array comprises different types of light generating devices, which may be (regularly) distributed over the array. In this way, depending on the (different) light generating devices applied, light with different spectral power distributions may be emitted from the same portion of the array. In an embodiment, the first array may be configured upstream of the first light emitting surface portion, thereby allowing the generation of first device light and light different from the first device light, respectively. In this way, depending on the operating mode of the light generating system, different types of light may be emitted (respectively) from the first light emitting surface portion. Alternatively or additionally, the second array may be configured upstream of the second light emitting surface portion, thereby allowing the generation of second device light and light different from the second device light, respectively. In this way, depending on the operating mode of the light generating system, different types of light may be emitted (respectively) from the second light emitting surface portion.

[0054] In an embodiment, one or more parts of the array of light generating devices can be optically separated from one or more other parts of the array of light generating devices. In this way, it may be possible to implement an operating mode in which a first device light can be emitted from a first light emitting surface part and a second device light can be emitted from a second light emitting surface part. However, such a system may also allow different parts to be combined over time, thereby allowing the shape and / or size of the first light emitting part and the second light emitting part to be controlled. Therefore, in a specific embodiment, the array can be separated by reflective (or opaque) walls (see also above).

[0055] In an embodiment, optics may be applied to substantially ensure that the first device light may be emitted from the first light emitting surface portion and / or the second device light may be emitted from the second light emitting surface portion.

[0056] In embodiments, the light generating system may further include a control system. In particular, the control system may control the operation of the first light generating device. Furthermore, in embodiments, the control system may control the operation of the second light generating device. In embodiments, the control system may be configured to (individually) control (or operate in an operational mode) one or more light generating devices.

[0057] The term "control" and similar terms particularly refer to at least determining the behavior or supervising the operation of an element. Therefore, in this article, "control" and similar terms may, for example, refer to imposing an action on an element (determining the behavior or supervising the operation of an element), such as, for example, measuring, displaying, actuating, opening, moving, changing the temperature, etc. In addition, the term "control" and similar terms may additionally include monitoring. Therefore, the term "control" and similar terms may include imposing an action on an element, as well as imposing an action on an element and monitoring the element. Control of the element may be accomplished using a control system, which may also be indicated as a "controller." Therefore, the control system and the element may be functionally coupled, at least temporarily or permanently. The element may include a control system. In embodiments, the control system and the element may not be physically coupled. Control may be accomplished via wired and / or wireless control. The term "control system" may also refer to multiple different control systems, particularly those that are functionally coupled, where, for example, one control system may be a master control system and one or more other control systems may be slave control systems. The control system may include or may be functionally coupled to a user interface.

[0058] The control system can also be configured to receive and execute instructions from a remote control. In an embodiment, the control system can be controlled via an app on a device, such as a portable device (e.g., a smartphone or iPhone, tablet, etc.). Therefore, the device is not necessarily coupled to the lighting system, but can be (temporarily) functionally coupled to the lighting system.

[0059] Therefore, in an embodiment, the control system can (also) be configured to be controlled by an app on a remote device. In such an embodiment, the control system of the lighting system can be a slave control system or a control in slave mode. For example, the lighting system can be identified by a code, in particular a unique code for the respective lighting system. The control system of the lighting system can be configured to be controlled by an external control system that accesses the lighting system based on knowledge of the (unique) code (input via a user interface or using an optical sensor (e.g., a QR code reader)). The lighting system can also include components for communicating with other systems or devices, such as based on Bluetooth, Thread, WiFi, LiFi, ZigBee, BLE, WiMAX, or other wireless technologies.

[0060] The system, device or apparatus may perform actions in a "mode" or "operating mode" or "operating mode" or "operable mode". The term "operable mode" may also be indicated as a "control mode". Similarly, in a method, an action or phase or step may be performed in a "mode" or "operating mode" or "operating mode" or "operable mode". This does not exclude that the system, device or apparatus may also be adapted to provide another control mode or multiple other control modes. Similarly, this may not exclude that one or more other modes may be performed before and / or after the execution of the mode.

[0061] However, in embodiments, a control system may be available that is adapted to provide at least a control mode. If other modes are available, the selection of such a mode may in particular be performed via a user interface, although other options (such as executing a mode based on sensor signals or (time) schemes) may also be possible. In embodiments, an operating mode may also refer to a system, or an apparatus, or a device that can only operate in a single operating mode (i.e., "on", without further tunability).

[0062] Thus, in an embodiment, the control system may be controlled depending on one or more of an input signal from a user interface, a sensor signal (of a sensor), and a timer (or clock module).The term "timer" may refer to a clock and / or a predetermined time scheme.

[0063] In summary, in a specific embodiment, the light generating system may further include a control system, wherein the control system is configured to (individually) control the first light generating device and the second light generating device depending on one or more of an input signal of a user interface, a sensor signal (of a sensor) and a timer.

[0064] In an embodiment, the light generating system may (therefore) include a sensor, wherein the sensor may be configured to generate a sensor signal depending on the presence of an object in the sensor's field of view. In particular, the sensor may be configured at least to detect the presence of a person in the sensor's field of view. In an embodiment, the sensor may be selected from the group consisting of a camera, a passive infrared sensor, an ultrasonic sensor, a microwave sensor, a time-of-flight sensor, and an audio sensor.

[0065] In an embodiment, the sensor may include a camera, such as, in particular, a digital camera or a lidar. In another embodiment, the sensor may include a passive infrared sensor. In an embodiment, the sensor may include an ultrasonic sensor. In an embodiment, the sensor may include an audio sensor. In an embodiment, the sensor may include a microwave sensor. In an embodiment, the sensor may include an IR sensor. In an embodiment, the sensor may include a light sensor. In a specific embodiment, the sensor may include a time-of-flight sensor. The sensor may generate (corresponding) sensor signals, for example, when observing a person or when observing a moving person. Therefore, in a specific embodiment, the light generating system further includes a sensor, wherein the sensor is configured to (i) sense the presence and / or movement of a person, and (ii) generate a corresponding sensor signal, and wherein the control system is configured to (individually) control the first light generating device and the second light generating device based on an input signal of the sensor signal (of the sensor). Therefore, in an embodiment, the control system may be configured to (individually) control the first light generating device and the second light generating device based on one or more of a user interface, the sensor signal (of the sensor), and a timer.

[0066] Therefore, the spectral power distribution of the first device light and the second device light can be different. In an embodiment, the spectral power distribution of the lighting module light coupled out of the light exit window can depend on the spectral power distribution of the first device light and / or the second device light coupled out from the first light generating device and / or the second light generating device. Alternatively or additionally, the radiant flux of the first device light emitted from the first light emitting surface can be controlled depending on the radiant flux of the second device light emitted from the second light emitting surface. In addition, one or more of the spectral power distribution of the first device light, the spectral power distribution of the second device light, the radiant flux of the first device light, and the radiant flux of the second device light can be controlled depending on one or more of a user interface, a sensor signal (of a sensor), and a timer. In particular, one or more of the spectral power distribution of the first device light, the spectral power distribution of the second device light, the radiant flux of the first device light, and the radiant flux of the second device light can be controlled depending on a sensor signal ((see also above) of a sensor).

[0067] For example, the movement of a person through a corridor may cause an adaptation of the spectral power distribution and / or radiant flux of one or more of the first device light and the second device light (or other adaptations, see also above). However, changing external conditions (such as time of day, day of year, light level, presence of clouds, rain, etc.) may cause an adaptation of the spectral power distribution and / or radiant flux of one or more of the first device light and the second device light (or other adaptations, see also above).

[0068] Thus, in embodiments, the control system can be configured to control the spectral power distribution of the lighting module light. Furthermore, in embodiments, the control system can be configured to control one or more of the color rendering index (CRI), correlated color temperature (CCT), and color point of the first device light and / or the second device light (and thus also the lighting module light). Thus, in specific embodiments, one or more of the first light generating device and the second light generating device have a controllable correlated color temperature of the respective device light; wherein the control system is configured to control the correlated color temperature of the respective device light based on one or more of a user interface, a sensor signal (of a sensor), and a timer (or clock module), particularly in embodiments based on the sensor signal.

[0069] In an embodiment, the lighting module may further include a third light generating device. Furthermore, in an embodiment, the light exit window may include a third luminous surface portion. In particular, the third luminous surface portion may have a third surface area SA3 and a third perimeter (P3). Furthermore, in an embodiment, the third perimeter (P3) may contact the window perimeter (P0) or partially overlap with the window perimeter (P0). Furthermore, the light exit window may have a surface area SA0, where SA0 = SA1 + SA2 + SA3. This may be particularly the case in embodiments in which one or more luminous surface portions do not include a border.

[0070] In other embodiments, most of the surface area of the light exit window may be comprised by the first, second and third emitting surface portions, in particular 0.98*SA0≤SA1+SA2+SA3, such as 0.95*SA0≤SA1+SA2+SA3, more in particular 0.9*SA0≤SA1+SA2+SA3. Thus, in an embodiment, 0.9*SA0≤SA1+SA2+SA3≤SA0.

[0071] Furthermore, in embodiments, the third light-generating device can be configured to generate third device light via a third light-emitting surface portion. Similar to the second light-emitting surface portion, in embodiments, the third light-emitting surface portion can have a cross-sectional shape similar to an ellipse. Such embodiments (i.e., ellipse-like shapes) have been discussed in more detail above. Alternatively, in embodiments, the third light-emitting surface portion can (also) have a cross-sectional shape similar to an arc.

[0072] Hence, in an embodiment, the third light emitting surface portion is arranged between the first light emitting surface portion and the second light emitting surface portion.In an alternative embodiment, the second light emitting surface portion and the third light emitting surface portion are separated by the first light emitting surface portion.

[0073] In particular, in an embodiment, substantially all third device light escaping from the light generating system escapes via the third light emitting surface.

[0074] Therefore, in a specific embodiment, the light generating system can be configured to generate system light, which includes at least a portion of the first device light (emitted from the first light-emitting surface), at least a portion of the second device light (emitted from the second light-emitting surface), and at least a portion of the third device light (emitted from the third light-emitting surface). Therefore, in an embodiment, the first device light, the second device light, and the third device light can be generated simultaneously.

[0075] Furthermore, in an embodiment, the control system may be configured to control one or more third light generating devices. In particular, the control system may be configured to control the light generating devices such that, when the third light emitting surface portion has an ellipse-like shape, in the first operating mode, the third device light escaping via the third light emitting surface portion has the same spectral power distribution as the spectral power distribution of the first device light escaping via the first light emitting surface portion. Additionally or alternatively, the control system may operate in a second operating mode, wherein the second device light escaping via the second light emitting surface portion has the same spectral power distribution as the spectral power distribution of the first device light escaping via the first light emitting surface portion, and the third device light escaping via the third light emitting surface portion has the same spectral power distribution as the spectral power distribution of the second device light escaping via the second light emitting surface portion. In an embodiment, when the third light emitting surface portion has an ellipse-like shape, in the third operating mode, the third device light escaping via the third light emitting surface portion may have the same spectral power distribution as the spectral power distribution of the first device light escaping via the first light emitting surface portion. Furthermore, in the fourth operating mode, the third device light escaping via the third light emitting surface portion may have the same spectral power distribution as the spectral power distribution of the second device light escaping via the second light emitting surface portion.

[0076] Therefore, in a specific embodiment, the lighting module also includes a third light generating device; wherein the light exit window includes a third light emitting surface portion, which has a third surface area SA3 and a third perimeter (P3); wherein the third light generating device is configured to generate third device light via the third light emitting surface portion; wherein the third light emitting surface portion has (i) an ellipse-like cross-sectional shape or (ii) an arc-like cross-sectional shape; the third perimeter (P3) contacts the window perimeter (P0) or partially coincides with the window perimeter (P0); wherein the control system is configured to control the light generating device so that: when the third light emitting surface portion has an ellipse-like shape, in the first operating mode (a), the third device light escaping via the third light emitting surface portion has the same spectral power distribution as the spectral power distribution of the first device light escaping via the first light emitting surface portion, and in the third operating mode (a) In the second operating mode, the second device light escaping through the second light-emitting surface portion has a spectral power distribution that is the same as the spectral power distribution of the first device light escaping through the first light-emitting surface portion, and the third device light escaping through the third light-emitting surface portion has a spectral power distribution that is the same as the spectral power distribution of the second device light escaping through the second light-emitting surface portion; and when the third light-emitting surface portion has an ellipse-like shape, in the third operating mode (a), the third device light escaping through the third light-emitting surface portion has a spectral power distribution that is the same as the spectral power distribution of the first device light escaping through the first light-emitting surface portion, and in the fourth operating mode, the third device light escaping through the third light-emitting surface portion has a spectral power distribution that is the same as the spectral power distribution of the second device light escaping through the second light-emitting surface portion.

[0077] As described above, the light generating system may include a first light chamber and a second light chamber. In further embodiments, the light generating system may include a third light chamber. In particular, the third light chamber may be an enclosed space, wherein, in embodiments, one of the walls may include a third light emitting surface portion. Furthermore, in embodiments, the other walls of the third light chamber may be reflective. In embodiments, at least a portion of the third light generating device may be included in the third light chamber. Thus, the third device light (generated by the third light generating device) may be coupled out of the third light chamber via the third light emitting surface portion. Furthermore, in embodiments, the third light chamber may not be optically connected to the first light chamber or the second light chamber.

[0078] In particular, the third optical chamber, the first optical chamber, and the second optical chamber are not configured to be in optical communication with each other.

[0079] Alternatively, in an embodiment, the light generating device may comprise (in addition to the first light guide and the second light guide) a third light guide. In particular, the third light guide may comprise a third light emitting surface portion. In an embodiment, the third light guide may be configured to be in a light receiving relationship with the third light generating device. Furthermore, in an embodiment, the third light guide may comprise a third light emitting light guide surface, from which third device light is emitted during operation of the third light generating device. In particular, the third light emitting surface portion may be configured to be in a light receiving relationship with the third light emitting light guide surface, or may comprise a third light emitting light guide surface. In an embodiment, one or more light guides may not be configured to be optically connected to each other. In particular, the first light guide, the second light guide and the third light guide may not be optically connected to each other.

[0080] In particular, the third light guide, the first light guide and the second light guide are not arranged to be in optical communication with each other.

[0081] Furthermore, in such embodiments, the third light generating device can be arranged outside the third light chamber and can provide third device light to the third light guide. Embodiments such as these can provide flexibility in the physical location in which the first (or second or third) light generating device can be arranged relative to the light exit window. As previously mentioned, in embodiments, the light guides can be separated by specular reflectors. However, in other embodiments, the light guides can (also) be separated by diffuse reflectors.

[0082] In addition, in an embodiment, the change in the luminous emittance of the first device light above the first light emitting surface portion or the change in the luminous emittance of the second device light above the second light emitting surface portion may be less than 5% of the corresponding average luminous emittance. Further still, in an embodiment, the change in the luminous emittance of the second device light above the second light emitting surface portion or the change in the luminous emittance of the third device light above the third light emitting surface portion may be less than 5% of the corresponding average luminous emittance (see also below). Therefore, in an embodiment, one or more of the following may be applied: (i) the change in the luminous emittance of the first device light above the first light emitting surface portion is less than 5% of the average luminous emittance above the first light emitting surface, and (ii) the change in the luminous emittance of the second device light above the second light emitting surface portion is less than 5% of the average luminous emittance above the second light emitting surface portion. If applicable, the following may also be applied in addition or alternatively: (iii) the change in the luminous emittance of the third device light above the third light emitting surface portion is less than 5% of the average luminous emittance above the third light emitting surface portion.

[0083] In this document, controlling a first device light may specifically refer to controlling one or more of the color point and radiant flux of the first device light. Similarly, controlling a second device light may specifically refer to controlling one or more of the color point and radiant flux of the second device light. However, similarly, controlling a third device light may specifically refer to controlling one or more of the color point and radiant flux of the third device light.

[0084] In yet another aspect, the present invention also provides a lamp or illuminator comprising a light generating system as defined herein. The illuminator may further include a housing, optical elements, shutters, and the like. The lamp or illuminator may further include a housing surrounding the light generating system. The lamp or illuminator may include a light window or housing opening in the housing through which the system light can escape from the housing. In yet another aspect, the present invention also provides a projection device comprising a light generating system as defined herein. In particular, a projection device or "projector" or "image projector" may be an optical device that projects an image (or moving image) onto a surface (such as, for example, a projection screen). The projection device may include one or more light generating systems, such as those described herein. Therefore, in one aspect, the present invention also provides a light generating device selected from the group of lamps, illuminators, projector devices, disinfection equipment, photochemical reactors, and optical wireless communication devices, comprising a light generating system as defined herein. The light generating device may include a housing or carrier configured to accommodate or support one or more elements of the light generating system.

[0085] In another aspect, the present invention may provide an indoor space. In embodiments, the space may include one or more of a wall, a sloped wall, a room divider, a roof, a sloped roof, and a ceiling. In particular, the indoor space may further include a light generating system suspended from the roof, sloped roof, ceiling, or wall. In other embodiments, the light generating system may be physically attached to the ceiling or wall using screws or fasteners. Thus, in this manner, the light generating system may be functionally coupled to the ceiling or wall. Furthermore, in embodiments, the light generating system may illuminate the indoor space using a lighting module, particularly artificial skylight light.

[0086] The term "indoor space" or "space" may, for example, refer to (a portion of) a reception area, such as a restaurant, hotel, clinic, or hospital. The term "space" may also refer to (a portion of) an office, department store, warehouse, cinema, church, theater, library, or the like. However, the term "space" may also refer to (a portion of) a workspace in a vehicle, such as the cab of a truck, the cockpit of an airplane, the cockpit of a ship, the cockpit of a car, the cockpit of a crane, the cockpit of an engineering vehicle (such as a tractor), the cockpit of a train car, or the like. The term "space" may also refer to (a portion of) a workspace, such as an office, a (production) factory, a power plant (such as a nuclear power plant, a gas-fired power plant, a coal-fired power plant, or the like). For example, the term "space" may also refer to a control room, a security room, or the like. In particular, the term "space" herein may refer to an indoor space. In yet other embodiments, the term "space" may also refer to a toilet or bathroom. In yet other embodiments, the term "space" may also refer to an elevator. In an embodiment, the term "space" may also refer to a conference room, a classroom, an indoor corridor, an indoor hallway, an indoor space in a nursing home, an indoor space in a sanatorium, etc. In an embodiment, the term "space" may refer to an indoor sports space, such as a gymnasium, a gymnastics hall, an indoor ball game space, a ballet studio, a swimming pool, a locker room, etc. In an embodiment, the term "space" may refer to an (indoor) bar, an (indoor) discotheque, etc.

[0087] Furthermore, in embodiments, the indoor space may include a control system and optional sensors. Such embodiments have been further described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference numerals indicate corresponding parts, and in which:

[0089] 1 a - 1 c schematically depict different views of a light generating system 1000 .

[0090] 2a - 2b schematically depict an embodiment of a light generating system 1000 comprising a first light guide 1310 and a second light guide 1320 .

[0091] 3 a - 3 b depict an embodiment of a light generating system 1000 comprising a third light emitting surface portion 1130 and a third light generating device 130 .

[0092] 4 a - 4 b depict an alternative embodiment of the light generating system 1000 comprising a third light emitting surface portion 1130 and a third light generating device 130 .

[0093] 5a - 5b schematically depict an embodiment of a lighting device 1200 comprising the light generating system 1000 .

[0094] The schematic drawings are not necessarily to scale. DETAILED DESCRIPTION

[0095] Fig. 1 schematically depicts different views of a light generating system 1000. Fig. 1a shows an isometric view of the light generating system, Fig. 1b shows a top view of the light generating system, and Fig. 1c shows a cross-sectional view of the light generating system.

[0096] In an embodiment, the present invention provides a light generating system 1000 including a lighting module 1500. In particular, the lighting module 1500 may include a first light generating device 110 and a second light generating device 120 (shown in FIG1c ). As described above, in an embodiment, the first light generating device 110 may generate a first device light 111, and the second light generating device 120 may generate a second device light 121, which may escape via a light exit window 1100. In an embodiment, the light generating system 1000 may be configured to provide a lighting module light 1501 (which includes the first device light 111 and the second device light 121) via the light exit window 1100. The light generated by the light generating system 1000 may be referred to as system light 1001 in particular. In an embodiment, the system light 1001 may include the lighting module light 1501.

[0097] The surface geometry of the light exit window 1100 can be observed in a top view of the light generating system 1000 (shown in FIG. 1 b ). In an embodiment, the light exit window 1100 may have a window perimeter P0. In the depicted embodiment, the lighting module 1500 has a circular shape with a perimeter P0. Furthermore, in an embodiment, the lighting module 1500 may include (i) a first light emitting surface portion 1110 having a first perimeter P1, and a second light emitting surface portion 1120 having a second perimeter P2. In particular, the second light emitting surface portion 1120 may have an ellipse-like cross-sectional shape. Note that this shape is ellipse-like, meaning that, in an embodiment, the shape may be identical to the overlapping area between two intersecting circles. Thus, in this shape, a major axis and a minor axis may be defined, and thus, in this sense, the shape may be ellipse-like. Furthermore, in this shape, the ellipse-like cross-sectional shape may particularly have sharp edges. In particular, the ellipse-like shape may comprise two points (as depicted in FIG. 1 b ), ie the shape may not be an oval (or elliptical), but rather the shape may have sharp edges (such as obtained from the intersection of two circles).

[0098] The ellipse-like cross-sectional shape may have a first portion of its perimeter P2 that contacts or partially overlaps with the window perimeter P0 and a second portion of its perimeter P2 that contacts or partially overlaps with the first perimeter P1 of the first emitting surface portion.

[0099] The interior of the light generating system 1000 can be observed in a cross-sectional view of the light generating system 1000 (shown in FIG1c ). In an embodiment, the first light generating device 110 can be configured to generate a first device light 111 via a first light emitting surface portion 1110. Furthermore, in an embodiment, the second light generating device 120 can be configured to generate a second device light 121 via a second light emitting surface portion 1120. As described above, in an embodiment, the lighting module 1501 can include one or more of the first device light 111 and the second device light 121.

[0100] In an embodiment, the first device light 111 may be white light having a first correlated color temperature CCT1 of a maximum of 8000K. Lower CCT values, such as below 5000K, may be particularly associated with warmer light, such as sunlight. In an embodiment, the second device light 121 may be (i) blue light or (ii) white light having a second correlated color temperature CCT2 of at least 5000K. In an embodiment, a larger CCT value may particularly relate to cooler light, such as sky light. As previously described, sky light may be particularly blue light, such as the color of the sky during a sunny day. Still further, in an embodiment, the first device light 111 and the second device light 121 may both be white light. In such an embodiment, when the first device light 111 and the second device light 121 are both white light, then CCT2-CCT1≥500K.

[0101] In an embodiment, the first light emitting surface portion 1110 and the second light emitting surface portion 1120 can be configured so that they share at least a portion of an edge or perimeter. Thus, in an embodiment, both the first perimeter P1 and the second perimeter P2 can contact or partially coincide with the window perimeter P0, as can be seen in FIG1 b.

[0102] As described above, in an embodiment, the second light emitting surface can be, in particular, elliptical (see Figures 1a and 1b). In another embodiment, the second light emitting surface portion 1120 can have a lens-like cross-sectional shape. A lens-like shape can particularly refer to a shape defined by two intersecting arcs, and in particular, the shape can be convex (i.e., the intersecting arcs are curved outward). In an embodiment, the light exit window 1100 can have a circular cross-sectional shape. In addition, in an embodiment, the light exit window 1100 can have a symmetry plane PS (indicated in Figure 1b) that intersects both the first light emitting surface portion 1110 and the second light emitting surface portion 1120.

[0103] In an embodiment, the optical axis O may be defined at the center of the light exit window 1100 and perpendicular to the light exit window 1100.

[0104] Surface areas SA1, SA2, and SA0 are also depicted in FIG. 1b. In an embodiment, the first light-emitting surface portion 1110 may have a first surface area SA1. In particular, the second light-emitting surface portion 1120 may have a second surface area SA2. More particularly, SA2 < SA1. Further, in an embodiment, the light exit window 1100 may have a surface area SA0. In particular, SA0 = SA1 + SA2.

[0105] Similarly, in an embodiment, L2 ≤ 0.4 * L1. Here, L1 may refer to the longest dimension of the first light-emitting surface portion. In the embodiment depicted in the figure, the first light-emitting surface portion may have a longest dimension L1 (equal to the diameter of the circular light exit window 1100). Further, in an embodiment, L2 may be the longest dimension of the second light-emitting surface portion 1120. Thus, in an embodiment, L2 may be the major axis of a similar elliptical shape, see FIG. 1b.

[0106] In an embodiment, CCT1 and CCT2 may be defined such that 2700K ≤ CCT1 ≤ 6500K, and in particular CCT2 ≥ 6500K. In particular, 6500K ≤ CCT2 ≤ 20000K. Further, in an embodiment, CCT2 - CCT1 ≥ 2000K.

[0107] FIG. 1c depicts a cross-sectional view, thus providing a view of the components disposed inside an embodiment of the light generation system 1000. In an embodiment, the light generation system 1000 may include (i) a first light chamber 1210 that includes the first light-emitting surface portion 1110 and surrounds at least a portion of the first light generation device 110. Similarly, in an embodiment, the light generation system may include a second light chamber 1220 that includes the second light-emitting surface portion 1120 and surrounds at least a portion of the second light generation device 120. Further, in an embodiment, the light chambers 1210, 1220 may not be configured to be optically connected to each other. In an embodiment, the light chambers 1210, 1220 may be separated by (diffuse) reflectors.

[0108] In an embodiment, the light exit window 1100 may include an optical diffuser 410. In particular, the optical diffuser 410 may include the first light-emitting surface portion 1110 and the second light-emitting surface portion 1120. In an embodiment, the optical diffuser 410 disposed above the first light chamber 1210 may not be optically connected to the optical diffuser 410 disposed above the second light chamber 1220. In an embodiment, they may be separated by (diffuse) reflectors.

[0109] In an embodiment, the first light chamber 1210 may include at least a portion of the plurality of first light generating devices 110. In further embodiments, the second light chamber 1220 may include at least a portion of the plurality of second light generating devices 120.

[0110] In an embodiment, the light generating system 1000 may further include a sensor 310 (depicted in FIG1c ). The sensor 310 may be external to the housing or may be included in the housing. In particular, the sensor 310 may be configured to (i) sense the presence and / or movement of a person, and (ii) generate a related sensor signal. Furthermore, in an embodiment, the control system 300 may be configured to (individually) control the first light generating device 110 and the second light generating device 120 based on an input signal of the sensor signal (of the sensor 310).

[0111] The height of the module 1500 , indicated with reference sign H1 , may be selected, for example, from the range of 1-100 mm, such as, for example, in the range of 5-20 mm.

[0112] Fig. 2 schematically depicts an embodiment of a light generating system 1000 comprising a first light guide 1310 and a second light guide 1320. Fig. 2a shows an isometric view of the light generating system 1000 and Fig. 2b shows a top view of the light generating system 1000.

[0113] In the depicted embodiment, the light generating system 1000 may include a first light guide 1310 and a second light guide 1320. In an embodiment, the first light guide 1310 may be configured to be in a light-receiving relationship with the first light generating device 110. In particular, the first light guide 1310 may include a first emitting light guide surface 1311 from which first device light 111 is emitted during operation of the first light generating device 110. More particularly, the first emitting surface portion 1110 may be configured to be in a light-receiving relationship with the first emitting light guide surface 1311, or may include the first emitting light guide surface 1311. That is, the first light generating device 110 may illuminate the first device light 111 onto the first light guide 1310, which may then be coupled out via the light exit window 1100.

[0114] Similarly, in an embodiment, the second light guide 1320 may be configured to be in a light-receiving relationship with the second light generating device 120. In particular, the second light guide 1320 may include a second emitting light guide surface 1321 from which second device light 121 is emitted during operation of the second light generating device 120. More particularly, the second emitting surface portion 1120 may be configured to be in a light-receiving relationship with the second emitting light guide surface 1321, or may include the second emitting light guide surface 1321. That is, the second light generating device 120 may illuminate the second device light 121 onto the second light guide 1320, which may then be coupled out via the light exit window 1100.

[0115] Furthermore, in embodiments, the light guides 1310 and 1320 may not be configured to be optically connected to one another. Note that in the depicted embodiment, the light generating device 1000, including the first light guide 1310 and the second light guide 1320, can both be illuminated by one or more first light generating devices 110 and one or more second light generating devices 120. In particular, the first light generating device 110 and the second light generating device 120 can be configured external to the lighting module 1500. Thus, the first light generating device 110 and the second light generating device 120 can illuminate the first light guide 1310 and the second light guide 1320, respectively, from the outside. Furthermore, in embodiments, the light guides 1310 and 1320 can be separated by a (specular) reflector. Thus, optical connection between the first light guide 1310 and the second light guide 1320 is prevented.

[0116] In the depicted embodiment, the first light guide 1310 and the second light guide 1320 can be separate, that is, they are not in physical contact. This can be observed in both Figures 2a and 2b. However, in the depicted embodiment, the first perimeter P1 and the second perimeter P2 can both contact the window perimeter P0 or partially overlap with the window perimeter P0.

[0117] As also indicated in FIG1 , in the depicted embodiment, the light generating system may further include a control system 300 and a sensor 310. In an embodiment, the sensor 310 may be configured to (i) sense the presence and / or movement of a person, and (ii) generate a related sensor signal. Furthermore, in an embodiment, the control system 300 may be configured to (individually) control the first light generating device 110 and the second light generating device 120 depending on an input signal of the sensor signal (of the sensor 310).

[0118] Furthermore, in an embodiment, one or more of the first light generating device 110 and the second light generating device 120 may have a controllable spectral power distribution of the respective device light 111, 121. In particular, the control system 300 may be configured to control the spectral power distribution of the respective device light 111, 121 depending on the sensor signal.

[0119] In an embodiment, one or more of the first light generating device 110 and the second light generating device 120 may have a controllable correlated color temperature of the respective device light 111, 121. In particular, the control system 300 may be configured to control the correlated color temperature of the respective device light 111, 121 depending on the sensor signal.

[0120] Fig. 3 depicts an embodiment of a light generating system 1000 comprising a third light emitting surface portion 1130 and a third light generating device 130. Fig. 3a and Fig. 3b show a cross-sectional view and a top view of the light generating system 1000.

[0121] 3a depicts a cross-sectional view, providing a view of components configured within an embodiment of the light generating system 1000. In an embodiment, the light generating system 1000 may include (i) a first light chamber 1210 including a first light emitting surface portion 1110 and surrounding at least a portion of the first light generating device 110. Similarly, in an embodiment, the light generating system 1000 may include a second light chamber 1220 including a second light emitting surface portion 1120 and surrounding at least a portion of the second light generating device 120. Furthermore, in an embodiment, the light generating system 1000 may include a third light chamber 1230 including a third light emitting surface portion 1130 and surrounding at least a portion of the third light generating device 130.

[0122] Furthermore, in embodiments, light chambers 1210, 1220, and 1230 may not be configured to be optically connected to one another. However, optical diffuser 410, as shown in FIG3 a , may be a single diffuser, and thus, portions of optical diffuser 410 disposed above first light chamber 1210, second light chamber 1220, and third light chamber 1230 may be optically connected to one another. In embodiments, optical diffuser 410 may include first light emitting surface portion 1110, second light emitting surface portion 1120, and third light emitting surface portion 1130.

[0123] In an embodiment, the third emitting surface portion 1130 may have a third surface area SA3 and a third perimeter P3. In an embodiment, the third light generating device 130 may be configured to generate third device light 131 (shown in FIG. 3 a ) via the third emitting surface portion 1130. In particular, the third emitting surface portion 1130 may have an elliptical cross-sectional shape (as depicted in FIG. 3 b ). Furthermore, in an embodiment, the third perimeter P3 may contact or partially overlap the window perimeter P0.

[0124] In an embodiment, the control system 300 may be configured to control the light generating devices 110, 120, 130. In particular, when the third light emitting surface portion 1130 has an ellipse-like shape, in the first operating mode (a), the third device light 131 may escape via the third light emitting surface portion 1130. In particular, the third device light 131 may have the same spectral power distribution as the spectral power distribution of the first device light 111 escaping via the first light emitting surface portion 1110.

[0125] Moreover, in embodiments, in the second operating mode, second device light 121 escaping via second light emitting surface portion 1120 may have the same spectral power distribution as the spectral power distribution of first device light 111 escaping via first light emitting surface portion 1110. Still further, in embodiments, third device light 131 escaping via third light emitting surface portion 1130 may have the same spectral power distribution as the spectral power distribution of second device light 121 escaping via second light emitting surface portion 1120.

[0126] In an embodiment, when the third light emitting surface portion 1130 may have an ellipse-like shape, in the third operating mode (a), the third device light 131 escaping via the third light emitting surface portion 1130 may have the same spectral power distribution as the spectral power distribution of the first device light 111 escaping via the first light emitting surface portion 1110. Furthermore, in an embodiment, in the fourth operating mode, the third device light 131 escaping via the third light emitting surface portion 1130 may have the same spectral power distribution as the spectral power distribution of the second device light 121 escaping via the second light emitting surface portion 1120.

[0127] An embodiment of the light generating system 1000 comprising three light emitting surface portions may comprise a light exit window 1100 having a surface area SA0 , wherein SA0 = SA1 + SA2 + SA3 .

[0128] In embodiments, there may be variation in the luminous emittance of first device light 111 over first luminous surface portion 1110. Alternatively, in embodiments, the luminous emittance of second device light 121 over second luminous surface portion 1120 may vary by less than 5% of the corresponding average luminous emittance.

[0129] Furthermore, as described above, the light generating system 1000 may include a control system 300 to (individually) control the first light generating device 110, the second light generating device 120, and the third light generating device 130. In particular, the light generating system 1000 may include a sensor 310, wherein the control system 300 may control the light generating system 1000 depending on a sensor signal.

[0130] Figure 4 depicts an alternative embodiment of a light generating system 1000 comprising a third light emitting surface portion 1130 and a third light generating device 130. Figure 4a depicts a top view of an embodiment of the light generating system 1000, and Figure 4b shows a cross-section of an embodiment of the light generating system 1000. In an embodiment, the third light emitting surface portion 1130 may (also) have an arc-like cross-sectional shape (as shown in Figure 4a).

[0131] In an embodiment, the light generating system 1000 may include a first light emitting surface portion 1110, a second light emitting surface portion 1120, and a third light emitting surface portion 1130, which may have perimeters P1, P2, and P3, respectively. In particular, at least a portion of the perimeters P1, P2, and P3 may coincide with the perimeter P0 of the light emitting surface 1100. Furthermore, the first light emitting surface portion 1110, the second light emitting surface portion 1120, and the third light emitting surface portion 1130 may in particular have surface areas SA1, SA2, and SA3, respectively. In particular, SA0 = SA1 + SA2 + SA3.

[0132] As further depicted in cross-section (see FIG. 4 b ), in an embodiment, the light generating system 1000 may include a first light chamber 1210 , a second light chamber 1220 , and a third light chamber 1230 , wherein the light chambers are not in optical communication with each other.

[0133] In an embodiment, first light chamber 1210, second light chamber 1220, and third light chamber 1230 may (each) surround one or more first light generating devices 110, second light generating devices 120, and third light generating devices 130, respectively. In particular, first light generating device 110, second light generating device 120, and third light generating device 130 may respectively generate first device light 111, second device light 121, and third device light 131. In particular, system light 1001 may include first device light 111, second device light 121, and third device light 131.

[0134] 3b and 4a, in an embodiment, the third light emitting surface portion is arranged between the first and second light emitting surface portions, and in an alternative embodiment, the second and third light emitting surface portions are separated by the first light emitting surface portion.

[0135] Other aspects defined with respect to the other embodiments described above may also apply to the present invention. For the sake of brevity, these features are not repeated. However, these features do not (also) limit the scope of the features described herein.

[0136] Figure 5a schematically depicts an embodiment of a lighting device 1200 including a light generating system 1000. The schematic drawings are not necessarily to scale. In an embodiment, the present invention may provide an indoor space 1300 including a ceiling 1310 and a light generating system 1000. In particular, a lighting module 1500 may be functionally coupled to the ceiling 1310. Furthermore, in an embodiment, the light generating system may further include a control system 300 and a sensor 310. Thus, Figure 5a schematically depicts an embodiment of a lighting device 1200 selected from the group consisting of a lamp 1, a luminaire 2, a projector device 3, a disinfection device, a photochemical reactor, and an optical wireless communication device, and including the light generating system 1000 as described herein. In an embodiment, such a lighting device may be a lamp 1, a luminaire 2, a projector device 3, a disinfection device, or an optical wireless communication device. Light emitting from the lighting device 1200 is indicated by reference numeral 1201. Illuminating device light 1201 may essentially consist of system light 1001, and thus, in a specific embodiment, may be system light 1001. In an embodiment, light generating device 1200 may be configured to provide system light 1001 on one or more surfaces in room 1300. In particular, light generating system 1000 may illuminate a wall 1307, a floor 1305, or a ceiling 1310 in room 1300. Reference numeral 301 indicates a user interface, which may be functionally coupled to a control system 300 that is included in or functionally coupled to light generating system 1000.

[0137] FIG5 b schematically depicts a corridor. The corridor may include windows. Optionally, the corridor may include lighting modules functionally coupled to (side) walls 1307 (not depicted). This may also simulate windows. Here, a plurality of modules 1500 are depicted, which are functionally coupled to ceiling 1310. Here, three modules 1500 are depicted as an example, but a single module 1500, two modules 1500, or more than three modules 1500 may also be used. The modules may have different shapes, merely as an example.

[0138] The term "plurality" means two or more.

[0139] Those skilled in the art will understand the terms "substantially" or "essentially" and similar terms herein. The terms "substantially" or "essentially" may also include embodiments with "completely," "entirely," "entirely," etc. Thus, in embodiments, the adjectives "substantially" or "essentially" may also be removed. Where applicable, the terms "substantially" or "essentially" may also refer to 90% or higher, such as 95% or higher, particularly 99% or higher, even more particularly 99.5% or higher, including 100%.

[0140] The term "comprising" also includes embodiments in which the term "comprising" means "consisting of.

[0141] The term "and / or" specifically refers to one or more of the items mentioned before and after "and / or". For example, the phrase "item 1 and / or item 2" and similar phrases can refer to one or more of item 1 and item 2. The term "comprising" can mean "consisting of" in one embodiment, but can also mean "including at least the defined categories and optionally one or more other categories" in another embodiment.

[0142] Furthermore, the terms first, second, third, etc. in the description and claims are used to distinguish between similar elements and not necessarily to describe 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.

[0143] During operation, an apparatus, device or system may be described herein - among other things. As will be clear to one skilled in the art, the present invention is not limited to methods of operation, or apparatus, devices or systems in operation.

[0144] 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.

[0145] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0146] The use of the verb "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 specification and claims, the words "comprise," "comprising," etc. should be interpreted in an inclusive sense, rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to."

[0147] The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0148] The present invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a device claim, or an apparatus claim, or a system claim that lists several components, several of these components may be embodied by the same item of hardware. The mere fact that certain measures are cited in mutually different dependent claims does not indicate that a combination of these measures cannot be used advantageously. In yet another aspect, the present invention (therefore) provides a software product that, when run on a computer, is capable of implementing (one or more embodiments of) the method as described herein.

[0149] The present invention also provides a control system that can control a device, apparatus, or system, or can perform the methods or processes described herein. Still further, the present invention provides a computer program product that, when functionally coupled to a device, apparatus, or system or executed on a computer included in the device, apparatus, or system, controls one or more controllable elements of such a device, apparatus, or system.

[0150] The present invention further applies to an apparatus, device or system comprising one or more of the characterizing features described in the specification and / or shown in the accompanying drawings. The present invention further relates to a method or process comprising one or more of the characterizing features described in the specification and / or shown in the accompanying drawings.

[0151] The various aspects discussed in this patent may be combined to provide additional advantages. Furthermore, those skilled in the art will appreciate that embodiments may be combined, and more than two embodiments may be combined. Furthermore, some features may form the basis of one or more divisional applications.

Claims

1. A light generating system (1000) comprising a lighting module (1500), wherein the lighting module (1500) comprises a skylight module; wherein the lighting module (1500) comprises a first light generating device (110), a second light generating device (120) and a light exit window (1100); wherein the light generating system (1000) is configured to provide lighting module light (1501) via the light exit window (1100); wherein: - the light exit window (1100) has a window perimeter (P0) and comprises: (i) a first light emitting surface portion (1110) having a first perimeter (P1), and (ii) a second light emitting surface portion (1120) having a second perimeter (P2); the second light emitting surface portion (1120) has a cross-sectional shape similar to an ellipse; - the first light generating device (110) is configured to generate a first device light (111) via the first light emitting surface portion (1110); the second light generating device (120) is configured to generate a second device light (121) via the second light emitting surface portion (1120); - the first device light (111) is white light having a first correlated color temperature CCT1 of at most 8000K; the second device light (121) is (i) blue light or (ii) white light having a second correlated color temperature CCT2 of at least 5000K; wherein when both the first device light (111) and the second device light (121) are white light, then CCT2-CCT1≥500K; and - Both the first perimeter (P1) and the second perimeter (P2) are in contact with or partially coincide with the window perimeter (P0).

2. The light generating system (1000) of claim 1, wherein the ellipse-like shape comprises two pointed ends.

3. The light generating system (1000) according to any one of the preceding claims, wherein the second light emitting surface portion (1120) has a lens-like cross-sectional shape.

4. A light generating system (1000) according to any one of the preceding claims, wherein the light exit window (1100) has a circular cross-sectional shape; wherein the light exit window (1100) has a symmetry plane (PS) that intersects both the first light emitting surface portion (1110) and the second light emitting surface portion (1120).

5. The light generating system (1000) according to any of the preceding claims, comprising (i) a first light chamber (1210), which includes the first light emitting surface portion (1110) and surrounds at least a portion of the first light generating device (110), and (ii) a second light chamber (1220), which includes the second light emitting surface portion (1120) and surrounds at least a portion of the second light generating device (120); wherein the light chambers (1210, 1220) are not configured to be optically connected to each other.

6. The light generating system (1000) according to claim 5, wherein the light exit window (1100) comprises an optical diffuser (410), wherein the optical diffuser (410) comprises the first light emitting surface portion (1110) and the second light emitting surface portion (1120).

7. The light generating system (1000) according to any of the preceding claims 1 to 4, wherein the light generating system (1000) comprises a first light guide (1310) and a second light guide (1320), wherein: - the first light guide (1310) is configured to be in a light receiving relationship with the first light generating device (110); wherein the first light guide (1310) comprises a first light emitting light guide surface (1311) from which first device light (111) is emitted during operation of the first light generating device (110); wherein the first light emitting surface portion (1110) is configured to be in a light receiving relationship with the first light emitting light guide surface (1311) or comprises the first light emitting light guide surface (1311); - the second light guide (1320) is configured to be in a light receiving relationship with the second light generating device (120); wherein the second light guide (1320) comprises a second light emitting light guide surface (1321), and during operation of the second light generating device (120), second device light (121) is emitted from the second light emitting light guide surface (1321); wherein the second light emitting surface portion (1120) is configured to be in a light receiving relationship with the second light emitting light guide surface (1321), or comprises the second light emitting light guide surface (1321); and - The light guides (1310, 1320) are not arranged to be in optical communication with each other.

8. The light generating system (1000) according to any one of the preceding claims, further comprising a control system (300), wherein the control system (300) is configured to individually control the first light generating device (110) and the second light generating device (120) depending on one or more of an input signal of a user interface (301), a sensor signal of a sensor (310), and a timer.

9. The light generating system (1000) according to claim 8, wherein the light generating system (1000) further comprises a sensor (310), wherein the sensor (310) is configured to (i) sense the presence and / or movement of a person, and (ii) generate a related sensor signal, and wherein the control system (300) is configured to individually control the first light generating device (110) and the second light generating device (120).

10. The light generating system (1000) according to claim 8-9, wherein one or more of the first light generating device (110) and the second light generating device (120) have a controllable spectral power distribution of the corresponding device light (111, 121); wherein the control system (300) is configured to control the spectral power distribution of the corresponding device light (111, 121).

11. The light generating system (1000) of claim 8-9 or claim 10, wherein one or more of the first light generating device (110) and the second light generating device (120) have a controllable correlated color temperature of the corresponding device light (111, 121); wherein the control system (300) is configured to control the correlated color temperature of the corresponding device light (111, 121).

12. The light generating system (1000) according to any of the preceding claims 8-11, wherein the lighting module (1500) further comprises a third light generating device (130); wherein: - the light exit window (1100) comprises a third luminous surface portion (1130) having a third surface area SA3 and a third perimeter (P3); - the third light generating device (130) is configured to generate third device light (131) via the third light emitting surface portion (1130); - the third light emitting surface portion (1130) has (i) an ellipse-like cross-sectional shape or (ii) an arc-like cross-sectional shape; the third perimeter (P3) contacts the window perimeter (P0) or partially coincides with the window perimeter (P0); and - the control system (300) being configured to control the light generating devices (110, 120, 130) so that when: (I) the third light emitting surface portion (1130) has an ellipse-like shape, in a first operating mode (a), the third device light (131) escaping via the third light emitting surface portion (1130) has the same spectral power distribution as the spectral power distribution of the first device light (111) escaping via the first light emitting surface portion (1110), and in a second operating mode, the second device light (121) escaping via the second light emitting surface portion (1120) has the same spectral power distribution as the spectral power distribution of the first device light (111) escaping via the first light emitting surface portion (1110), and The third device light (131) has the same spectral power distribution as the spectral power distribution of the second device light (121) escaping via the second light emitting surface portion (1120); and (II) the third light emitting surface portion (1130) has an ellipse-like shape, in the third operating mode (a), the third device light (131) escaping via the third light emitting surface portion (1130) has the same spectral power distribution as the spectral power distribution of the first device light (111) escaping via the first light emitting surface portion (1110), and in the fourth operating mode, the third device light (131) escaping via the third light emitting surface portion (1130) has the same spectral power distribution as the spectral power distribution of the second device light (121) escaping via the second light emitting surface portion (1120).

13. A light generating system (1000) according to any of the preceding claims, wherein one or more of the following applies: (i) the variation of the luminous emittance of the first device light (111) above the first light emitting surface portion (1110) is less than 5% of the corresponding average luminous emittance, and (ii) the variation of the luminous emittance of the second device light (121) above the second light emitting surface portion (1120) is less than 5% of the corresponding average luminous emittance.

14. An indoor space (1300) comprising a ceiling (1310) and a light generating system (1000) according to any one of the preceding claims, wherein a lighting module (1500) is functionally coupled to the ceiling (1310).

15. The indoor space (1300) according to claim 14 further comprises a control system (300), wherein the control system (300) is configured to individually control the lighting module (1500) depending on one or more of an input signal of a user interface, a sensor signal of a sensor (310), and a timer.

Images