Improved artificial skylights

Abstract

The present invention provides a light-generation system (1000) including an illumination module (1500), the illumination module (1500) comprising a first light-generation device (110), a second light-generation device (120), and a light-exit window (1100), the light-generation system (1000) being configured to provide illumination module light (1501) through the light-exit window (1100), the light-exit window (1100) having a window perimeter (P0), and including (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) having an elliptical cross-sectional shape, the first light-generation device (110) emitting a first device light (111) through the first light-emitting surface portion (1110). a second light-generating device (120) configured to generate a second device light (121) through a 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 8000K, and the second device light (121) is either (i) blue light or (ii) white light having a second correlated color temperature CCT2 of at least 5000K, and when both the first device light (111) and the second device light (121) are white light, CCT2-CCT1≧500K, and both the first perimeter (P1) and the second perimeter (P2) abut or partially coincide with a window perimeter (P0).

Description

[Technical Field]

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

[0002] Light-emitting modules are known in the art. For example, US2013249407 describes a first LED group including a plurality of LEDs arranged in a regular annular pattern on the circumference of a substantially rectangular ceramic substrate. Furthermore, the first LED group including a plurality of LEDs is completely covered in a circular pattern with a sealing member. Furthermore, a second LED group including a plurality of LEDs is arranged regularly in a grid pattern near the center of the substantially rectangular substrate. Furthermore, the LED group including a plurality of LEDs is completely covered with a sealing member. Furthermore, the sealing member completely covers the inside of the annular portion of the first region. Summary of the Invention [Problem to be solved by the invention]

[0003] In modern times, people may have to spend a lot of time indoors, especially in situations where they must work or attend school from their home environment. Therefore, access to or exposure to natural daylight in such environments is highly beneficial. Natural daylight has a positive impact on personal health, particularly on vitamin D production. Furthermore, as current trends appear to encourage indoor work, natural light may become increasingly important in the future. A solution may be the use of artificial skylights that can provide the illusion of sunlight. Artificial skylights can provide emulation of at least some aspects of an outdoor environment in an indoor environment. Demand for artificial skylights is increasing due to their beneficial properties for human health. Because people tend to spend most of their day indoors and may be further removed from natural daylight, there is interest in creating artificial light that can simulate the appearance and light of natural windows or skylights. Thus, there appears to be a need for (improved) artificial skylights or other types of lighting devices or light-generating systems that enhance the natural appearance.

[0004] It is therefore an aspect of the present invention to provide an alternative system for generating light that preferably also at least partially obviates one or more of the disadvantages mentioned above. The present invention may have the object of overcoming or ameliorating at least one of the disadvantages of the prior art, or of providing a useful alternative. [Means for solving the problem]

[0005] Thus, in a first aspect, the present invention provides a light-generating system including a lighting module ("module"), such as an artificial skylight. In particular, the lighting module may include a first light-generating device, a second light-generating device, and a light exit window. In some embodiments, the light-generating system may be configured to provide lighting module light through the light exit window. In particular, the light exit window may have a window perimeter (P0) and may include (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 some embodiments, the second light-emitting surface portion may have an ellipse-like cross-sectional shape. In some embodiments, the first light-generating device may be configured to generate first device light through the first light-generating surface portion. In particular, the second light-generating device may be configured to generate second device light through the second light-emitting surface portion. Furthermore, in some embodiments, the first device light may be white light having a first correlated color temperature CCT1 of at most 8000 K. The second device light may be, in particular, (i) blue light or (ii) white light having a second correlated color temperature CCT2 of at least 5000 K. In some embodiments, when both the first device light and the second device light are white light, in particular, CCT2-CCT1≧500 K may apply. In some embodiments, both the first perimeter (P1) and the second perimeter (P2) may touch the window perimeter (P0) or partially coincide with the window perimeter (P0).Thus, in certain embodiments, the present invention provides a light-generation system including an illumination module, the illumination module including a first light-generating device, a second light-generating device, and a light-exit window, the light-generation system configured to provide illumination module light through the light-exit window, the light-exit window having a window perimeter (P0), and including (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 having an elliptical cross-sectional shape, the first light-generating device configured to generate first device light through the first light-emitting surface portion, and the second light-generating device configured to generate first device light through the first light-emitting surface portion. The device is configured to generate a second device light through a second light-emitting surface portion, the first device light being white light having a first correlated color temperature CCT1 of at most 8000K, and the second device light being either (i) blue light or (ii) white light having a second correlated color temperature CCT2 of at least 5000K, wherein CCT2-CCT1≧500K when both the first device light (111) and the second device light (121) are white light, and both the first perimeter (P1) and the second perimeter (P2) abut or partially coincide with a window perimeter (P0).

[0006] In this way, the present invention may provide improved lighting modules, such as artificial skylights. This system can, among other things, create a (virtual) connection with the outside world by mimicking natural daylight from (simulated) lighting modules with two different spectral power distributions, e.g., simulating sunlight and natural bluish light scattered from the sky. Also, by controlling the spectral power distribution (e.g., by controlling color temperature), the illusion of different types of weather, e.g., cloudy weather, may be provided. The present invention can be used in spaces with limited or no access to daylight, such as office spaces, hospitality areas, and spaces deprived of access to natural light, especially basements and control rooms. The present invention may be used to help people maintain a connection with the dynamic natural world outside by creating a realistic illusion of a skylight (or "roof light") or window, thus making indoor environments with little or no daylight access more appealing. Furthermore, whereas prior art systems can have significant depth, the present invention allows for a relatively shallow solution.

[0007] As mentioned above, in some embodiments, the present invention provides a light-producing system including an illumination module. In some embodiments, the illumination module light may provide light that mimics natural light observed on a sunny day. This may include, among other things, a combination of blue light resulting from atmospheric scattering of sunlight and white light, which may mimic direct sunlight. Alternatively, in some embodiments, the illumination module may provide a combination of white light at two different color temperatures. Thus, in some embodiments, the illumination module may provide light that mimics such natural skylight. Furthermore, in certain embodiments, the illumination module may provide light that mimics natural light observed on an overcast day or during sunset or sunrise.

[0008] In this specification, a lighting module may be specifically designed as an artificial skylight, i.e., a lighting module that is operatively coupled to a ceiling. However, other applications are also encompassed herein, such as an artificial window that is operatively coupled to a wall. Thus, the term "lighting module" may refer in certain embodiments to an artificial skylight (and in certain other embodiments to another type of lighting module).

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

[0010] As used herein, the term "functionally coupled" may refer, in certain embodiments, to a physical or mechanical connection between at least two elements, for example, via one or more of screws, solder, adhesive, a melt connection, a click connection, etc. The terms "physical connection" and "mechanical connection" may be used interchangeably herein. Thus, the terms "physical connection" and "mechanical connection" may refer to an adhesive connection. Alternatively or additionally, the term "functionally coupled" may refer, in certain embodiments, to a conductive connection between at least two elements.

[0011] In particular, operatively coupled in this context may mean that the lighting module is associated with a wall or ceiling. Furthermore, in this context, it may mean that the lighting module is coupled to a power source, such as the mains power supply.

[0012] In some embodiments, the lighting module may include a first light-generating device, a second light-generating device, and a light exit window. In particular, the light-generating system may be configured to provide the lighting module light through the light exit window. Thus, in some embodiments, the light exit window may be optically transparent. The light exit window may comprise an optically transparent material such as glass, PMMA, PET, PC, etc. Such embodiments are described further below.

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

[0014] In some embodiments, the light exit window may have a window perimeter (P0). Furthermore, in some embodiments, 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 some embodiments, the window perimeter may essentially be defined by a portion of the first perimeter (P1) and a portion of the second perimeter (P2). Furthermore, in particular, in some embodiments, the portions of the first perimeter (P1) and the second perimeter (P2) that do not contribute to the window perimeter may essentially overlap. Thus, in some embodiments, both the first perimeter (P1) and the second perimeter (P2) may abut the window perimeter (P0) or partially coincide with the window perimeter (P0).

[0015] The two aforementioned light-emitting surface portions, i.e. the first and second light-emitting surface portions, may in some embodiments essentially divide the surface of the light-exit window into two regions, each having an associated perimeter and surface area. Typically, in some embodiments, the first and second light-emitting surface portions may in particular divide the light-exit window into two different regions, and therefore the first and second light-emitting surface portions may in particular share part of their boundary with the light-exit window.

[0016] In some embodiments, the second light-emitting surface portion may have an elliptical cross-sectional shape. An ellipse may be, in particular, a closed shape that surrounds two focal points, and the extent of the ellipse may be defined by a major axis and a minor axis. In some embodiments, the second light-emitting surface portion may have, in particular, an elliptical cross-sectional shape, i.e., a shape that may define a minor axis and a major axis, but that does not necessarily have a smooth boundary. In particular, the ends of the elliptical cross-sectional shape may be sharp (as opposed to the smooth boundary of an ellipse), for example, also referred to as a lens shape. Such embodiments are described further below. Furthermore, the elliptical cross-sectional shape may have a first portion of its perimeter that is tangent to or partially coincides with the window perimeter (P0) and a second portion of its perimeter that is tangent to or partially coincides with the first perimeter (P1) of the first light-emitting surface portion.

[0017] As mentioned above, in some embodiments, the first light-generating device may be configured to generate first device light (which may exit) through a first light-emitting surface portion, and in some embodiments, the second light-generating device may be configured to generate second device light (which may exit) through a second light-emitting surface portion.

[0018] In some embodiments, the first and second light-emitting surfaces may be separated so as not to be in optical communication with each other. Mutual optical communication between the two elements may refer to the exchange (or transmission) of light between the two elements or from one element to the other. Thus, in some embodiments, the light exiting the first light-emitting surface may be free of second device light, and the light exiting the second light-emitting surface may be free of first device light. Downstream from the light exit window, the beams of first and second device light may at least partially overlap, for example, at some distance from the exit window. Thus, in the far field, the beams of first and second device light may at least partially overlap. However, essentially no first device light may exit the second light-emitting surface, and essentially no second device light may exit the first light-emitting surface.

[0019] Thus, in some embodiments, essentially all of the first device light that leaves the light-generating system leaves through the first light-emitting surface, and similarly, essentially all of the second device light that leaves the light-generating system leaves through the second light-emitting surface.

[0020] In particular, in some embodiments, the light-generating system may be configured to generate system light that includes at least a portion of the first device light (emitting from the first light-emitting surface) and at least a portion of the second device light (emitting from the second light-emitting surface). Thus, in some embodiments, the first device light and the second device light may be generated simultaneously.

[0021] In some embodiments, there may be a reflective separator between the first and second light-emitting surfaces to prevent mutual optical communication (between the first and second light-emitting surfaces).

[0022] Thus, in some embodiments, the light-generating system may provide illumination module light through a light exit window. In particular, the illumination module light may comprise first device light, or second device light, or both (depending on the mode of operation). However, in particular modes of operation, the illumination module light comprises both first device light and second device light.

[0023] In some embodiments, the first device light may be white light having a first correlated color temperature CCT1 of at most 8000 K, e.g., at most 7000 K, particularly at most 6000 K, more particularly at most 5000 K. Furthermore, in some embodiments, the second device light may be (i) blue light or (ii) white light having a second correlated color temperature CCT2 of at least 5000 K, e.g., at least 6000 K, particularly at least about 8000 K. In further embodiments, the second device light may be even higher, e.g., at least about 10000 K, particularly at least 12000 K. Here, CCT may refer to correlated color temperature, which may be a color temperature scale used to classify the color of light emitted by a light-generating device, as known in the art. In some embodiments, 1800 K≦CCT1≦8000 K, more particularly 1800 K≦CCT1≦5000 K. Furthermore, in some embodiments, 5000K≦CCT2≦20000K, more particularly 6500K≦CCT2≦15000K. The second device light may be a combination of blue light and white light. Note that white light with a high CCT may (already) be bluish.

[0024] It should be noted that the first correlated color temperature CCT1 may be at most 8000 K, and the second correlated color temperature CCT2 may be at least 5000 K, but CCT1 and CCT2 are selected such that CCT2 > CCT1. Thus, with such a combination of the first device light and the second device light, the light-generating system may provide, in some embodiments, a lighting module light. However, in some embodiments, when (both) the first device light and the second device light are white light, CCT2 - CCT1 ≧ 500 K, e.g., CCT2 - CCT1 ≧ 1000 K, particularly CCT2 - CCT1 ≧ 2000 K. In particular embodiments, CCT2 - CCT1 ≧ 3000 K, e.g., CCT2 - CCT1 ≧ 4000 K, more particularly CCT2 - CCT1 ≧ 5000 K. In this way, the light-generating device may provide, in particular, a lighting module light including light of at least two different CCTs.

[0025] The terms "blue light" or "blue emission," and similar terms, may particularly refer to light having a wavelength in the range of about 440 to 490 nm (including some purple and cyan hues). In certain embodiments, blue light may have a center wavelength in the range of 440 to 490 nm. The term "white light" and similar terms used herein are known to those skilled in the art. They may particularly refer to light having a correlated color temperature (CCT) between about 1800 K and 20,000 K, e.g., between 2,000 K and 20,000 K, particularly between 2,700 and 20,000 K, and particularly light for general illumination in the range of about 2,000 to 7,000 K, such as in the range of 2,700 K to 6,500 K.

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

[0027] Furthermore, the light-generating system may, in some embodiments, include a housing, which may include one or more walls. In particular, one of the walls of the housing may be light-transmitting. More particularly, such a wall may include a light-exit window. As mentioned above, the light-exit window may be light-transmitting (or optically transparent). Furthermore, in some embodiments, the light-exit window may include a light-transmitting material.

[0028] Optically transparent materials are known to those skilled in the art as materials that allow light to pass through. Optically transparent materials may be transparent to light, and in certain embodiments, the transmittance of light through the optically transparent material in a direction perpendicular to its surface may be at least 50%, such as at least about 75%, in certain embodiments at least 90%, and more particularly at least about 100%. Furthermore, in certain embodiments, the optically transparent material may be a material such as glass or an optically transparent polymer material, e.g., PMMA. See further below.

[0029] The light-transmitting material may be PE (polyethylene), PP (polypropylene), PEN (polyethylene napthalate), PC (polycarbonate), PU (polyurethane), PMA (polymethylacrylate), PMMA (polymethylmethacrylate) (Plexiglas or Perspex), PMI (polymethacrylimide), PMMI (polymethylmethacrylimide), SAN (styrene acrylonitrile resin), CAB (cellulose acetate butyrate), silicone, PVC (polyvinylchloride), and in one embodiment PETG (glycol modified polyethylene terephthalate). The transparent organic material may comprise one or more materials selected from the group consisting of transparent organic materials, such as selected from the group consisting of PET (polyethylene terephthalate), PDMS (polydimethylsiloxane), and COC (cyclo olefin copolymer).In particular, the light-transmitting material may be, for example, PC (polycarbonate), P(M)MA (poly(methyl)methacrylate), polyglycolide or PGA (polyglycolic acid), PLA (polylactic acid), PCL (polycaprolactone), PEA (polyethylene adipate), PHA (polyhydroxy alkanoate), PHB (polyhydroxy butyrate), PHBV (poly(3-hydroxybutyrate-co-3-hydroxyvalerate)), PET (polyethylene terephthalate), PBT (polybutylene terephthalate), The light-transmitting material may comprise an aromatic polyester or a copolymer thereof, such as poly(ethylene terephthalate), PTT (polytrimethylene terephthalate), or PEN (polyethylene napthalate). In particular, the light-transmitting material may comprise PET (polyethylene terephthalate). The light-transmitting material is therefore 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, transparent ceramic materials, and silicones. Also, hybrid materials comprising both inorganic and organic parts may be applied. In particular, the light-transmitting material comprises one or more of PMMA, transparent PC, or glass.

[0030] In some embodiments, the light exit window may be semi-transparent. In particular, the light exit window may be light diffusing / scattering. The latter allows light to exit the housing while preventing an observer from looking into the housing from the outside through the light exit window. Thus, in some embodiments, the light exit window is not completely transparent, allowing for useful viewing when at least some of the light exiting the system is scattered at the light exit window.

[0031] Other walls of the housing, such as the sidewalls and / or bottom (walls), may be reflective, particularly diffusely reflective, in some embodiments. Additionally, the housing may include one or more interior walls that may be used to (optically) separate the space upstream from the first light-emitting surface from the space upstream from the second light-emitting surface. In this way, essentially no first device light may exit the second light-emitting surface, and essentially no second device light may exit the first light-emitting surface.

[0032] As indicated above, the housing may be relatively shallow. Thus, for example, a skylight may be obtained with a relatively shallow device. For example, the height may be from a few millimeters to a few centimeters or more, for example, selected from a range of 1 to 100 mm, such as 4 to 100 mm, such as 4 to 80 mm, such as 2 to 100 mm, for example, at most 50 mm, such as a range of 5 to 20 mm.

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

[0034] In particular, the second light-emitting surface portion (included in the light exit window) may have an ellipse-like shape in some embodiments. An ellipse-like shape may resemble an ellipse in certain features, such as having an elongated cross-sectional shape that may be characterized by a major axis and a minor axis. Furthermore, in some embodiments, an ellipse-like shape may be surrounded by one or more curved boundaries. However, in some embodiments, an ellipse-like shape may include two pointed ends. This may distinguish an ellipse-like shape from an ellipse in some embodiments. In some embodiments, an ellipse-like shape may be defined as a shape that is the intersection area between two circles. Thus, a shape may be defined by two curves (i.e., arcs from two circles) and may have sharply pointed ends (i.e., ends at two intersection points of two circles).

[0035] In some embodiments, the second light-emitting surface portion may have a lenticular cross-sectional shape. As mentioned above, a lens may be a convex shape bounded by two arcs joined at their endpoints. Alternatively, in some embodiments, the same shape may be formed by the union of two circular disks. Note that in some embodiments, the two arcs that may form the lenticular cross-sectional shape may be the mutual area formed by the intersection of two circles. In particular, the radii of the two circles may be different. Therefore, the curvatures of the arcs that may form the lenticular cross-sectional shape may be different. Thus, in some embodiments, the lenticular cross-sectional shape may have a plane of symmetry passing through the two sharp ends of the lenticular cross-sectional shape. However, in other embodiments, the lenticular shape may not have a plane of symmetry passing through the two sharp ends of the lenticular cross-sectional shape. Furthermore, in some embodiments, the lenticular shape may be the mutual area formed by the intersection of other curved shapes, such as oval, elliptical, or egg-shaped cross-sections. Furthermore, in some embodiments, 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 an oval, ellipsoid, egg shape, etc.

[0036] In certain embodiments, the light exit window may have a plane of symmetry (PS). In particular, the plane of symmetry (PS) may be a flat plane that may bisect the light exit window such that the two halves of the light exit window are mirrored. More particularly, such bisection may provide two halves that (each) include a portion of (both) the first and second light-emitting surface portions. Thus, in certain embodiments, the light exit window has a circular cross-sectional shape, and the light exit window has a plane of symmetry (PS) that intersects both the first and second light-emitting surface portions.

[0037] In one embodiment, the light exit window may in particular be flat. In particular, the light exit window may have a surface area SA0. Further, in one embodiment, the first light emitting surface portion may include a first surface area SA1. Further, in one embodiment, the second light emitting surface portion may include a second surface area SA2. Typically, in one embodiment, the second surface area may be smaller than the first surface area. This can be advantageous in providing illumination module light as a larger first surface area (compared to the second surface area) can provide the advantage of outcoupling more first device light (compared to the second device light). Therefore, in one embodiment, SA2 < 2*SA1, for example SA2 < SA1, particularly SA2 < 0.5*SA1. Further, in one embodiment, the total surface area of the light exit window may be completely included in the first surface area SA1 and the second surface area SA2. In particular, SA0 = SA1 + SA2. It should be noted that these above-described surface areas may in one embodiment be defined excluding the area occupying the boundary between the surface areas SA1 and SA2. However, in other embodiments, the first light emitting surface portion and the second light emitting surface portion may be separated by a reflective (or opaque) separator. In such embodiments, most of the surface area of the light exit window may be included in the first light emitting surface portion and the second light emitting surface portion, particularly 0.98*SA0 ≦ SA1 + SA2, for example 0.95*SA0 ≦ SA1 + SA2, more particularly 0.9*SA0 ≦ SA1 + SA2. Thus, particularly 0.9*SA0 ≦ SA1 + SA2 ≦ SA0.

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

[0039] In certain embodiments, the longest extent of the first light-emitting surface portion may be referred to as a first length L1. In certain embodiments, the longest extent of the second light-emitting surface portion may be the major axis of an elliptical shape (or a lens-shaped cross-sectional shape). More particularly, the longest extent of the second light-emitting surface portion may be referred to as a second length L2.

[0040] It should be noted that in certain embodiments, the first length L1 and the second length L2 may be defined particularly in parallel. Further, in certain embodiments, L2 ≤ L1, for example L2 ≤ 0.4*L1, particularly L2 ≤ 0.25*L1. Such embodiments may provide the advantage of out-coupling more of the first device light compared to the second device light. Thus, in certain embodiments, the first light-emitting surface portion has a first surface area SA1, the second light-emitting surface portion has a second surface area SA2, SA2 < SA1, L2 ≤ 0.4*L1, and the light exit window has a surface area SA0, where SA0 = SA1 + SA2.

[0041] As described above, it may be desirable to provide embodiments in which the first device light is white light and the second device light is either blue light or white light (however, this may also include combinations of blue light or white light). Thus, in certain embodiments, the second device light may be selected from a colder color temperature, in contrast to the first device light which may be selected from a warmer color temperature.

[0042] Particularly, the first correlated color temperature CCT1 may be selected from the range of 2700K ≤ CCT1 ≤ 6500K, for example 3500K ≤ CCT1 ≤ 6500K, particularly 5000K ≤ CCT1 ≤ 6500K. Further, in certain embodiments, CCT1 may be selected from the range of 2700K ≤ CCT1 ≤ 6000K, for example 2700K ≤ CCT1 ≤ 5000K, particularly 2700K ≤ CCT1 ≤ 3500K.

[0043] In particular, in some embodiments, CCT2 may be selected from the range of CCT2≧6500K, particularly CCT2≧8000K, and more particularly CCT2≧12000K. Furthermore, in some embodiments, CCT2 may be selected from the range of 6500K≦CCT2≦20000K, for example 8500K≦CCT2≦20000K, and particularly 8500K≦CCT2≦15000K. In particular embodiments, 2700K≦CCT1≦6500K and CCT2≧6500K. As mentioned above, some embodiments may include a first device light that may be white light and a second device light that may (also) be white light. In such an embodiment, it may be advantageous to provide light comprising two correlated color temperatures which differ in color temperature according to CCT2-CCT1≧1000 K, for example CCT2-CCT1≧2000 K, in particular CCT2-CCT1≧4000 K, more in particular CCT2-CCT1≧8000 K. Thus, in this way, lighting module light may be provided such that it comprises light with two different color temperatures.

[0044] In some embodiments, the light-generating system may include a first light chamber. In particular, the first light chamber may be an enclosed space, one of whose walls may, in some embodiments, be a first light-emitting surface. Furthermore, in some embodiments, the other wall of the first light chamber may be, in particular, reflective (to the respective device light). Furthermore, in some embodiments, the light-generating system may include a second light chamber. In particular, the second light chamber may (also) be an enclosed space, one of whose walls may, in some embodiments, be a second light-emitting surface. Furthermore, in some embodiments, the other wall of the light-emitting surface may be reflective (to the respective device light).

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

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

[0047] In some embodiments, the light exit window may include an optical diffuser. The optical diffuser may, among other things, provide diffused light (e.g., by scattering). Scattering light, among other things, disrupts the ordered nature of light waves, resulting in pseudo-random variations in the phase of the light, thus providing diffused light. Light beams may be desired in workplaces such as offices, schools, and homes. However, diffused light may also be desired due to its soothing (i.e., less harsh) quality of light compared to exposure to light beams. Furthermore, diffused light may be particularly useful for more uniformly illuminating a space. In such embodiments, the optical diffuser may include (both) a first light-emitting surface portion and a second light-emitting surface portion.

[0048] In some embodiments, the light diffuser may include scattering particles embedded therein. Such particles may, among other things, scatter an incident light beam and thus provide diffused light. Thus, in certain embodiments, the light exit window includes a light diffuser, and the light diffuser includes a first light-emitting surface portion and a second light-emitting surface portion.

[0049] In certain embodiments, the first light chamber may include a first light-generating device. In further embodiments, the first light chamber may include a plurality of first light-generating devices. Similarly, in certain embodiments, the second light chamber may include a second light-generating device. In further embodiments, the second light chamber may include a plurality of second light-generating devices. Thus, in certain 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 some embodiments, the light-generation system may include a first light guide. In particular, the first light guide may include a first light-emitting surface portion. Furthermore, in some embodiments, the light-generation system may include a second light guide. In particular, the second light guide may include a second light-emitting surface portion. In some embodiments, the first light guide may be configured in a light-receiving relationship with the first light-generating device. Furthermore, in some embodiments, the first light guide may include a first light-emitting light guide surface from which first device light exits during operation of the first light-generating device. In particular, the first light-emitting surface portion may be configured in a light-receiving relationship with the first light-emitting light guide surface or may include the first light-emitting light guide surface.

[0051] Similarly, in some embodiments, the second light guide may be configured in a light-receiving relationship with the second light-generating device. In particular, the second light guide may include a second light-emitting light guide surface from which the second device light can exit during operation of the second light-generating device. In particular, the second light-emitting surface portion may be configured in a light-receiving relationship with the second light-emitting light guide surface or may include the second light-emitting light guide surface. In some embodiments, the light guides may not be configured to be in optical communication with each other. In particular, the first light guide and the second light guide may not be in communication with each other. Such embodiments may provide flexibility in the physical location where the first (or second) light-generating device can be configured relative to the light exit window. In some embodiments, 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 certain embodiments, the light generation system comprises a first light guide and a second light guide, the first light guide configured in light-receiving relationship with a first light-generating device, the first light guide including a first light-emitting light guide surface from which first device light exits during operation of the first light-generating device, the first light-emitting surface portion configured in light-receiving relationship with the first light-emitting light guide surface or including the first light-emitting light guide surface, the second light guide configured in light-receiving relationship with a second light-generating device, the second light guide including a second light-emitting light guide surface from which second device light exits during operation of the second light-generating device, the second light-emitting surface portion configured in light-receiving relationship with the second light-emitting light guide surface or including the second light-emitting light guide surface, and the light guides are not configured to be in optical communication with each other. The first and second light guides may, in some embodiments, include light outcoupling structures for outcoupling the first and second device light from the first and second light guides, respectively.

[0052] As indicated above, the first device light may exit through the first light-emitting surface, and the second device light may exit through the second light-emitting surface. However, in certain embodiments, in another operating mode of the light-generating system, light different from the first device light may exit through the first light-emitting surface, and / or light different from the second device light may exit through the second light-emitting surface. For example, in one operating mode of the light-generating system, the second device light may exit through the first light-emitting surface, and the first device light may exit through the second light-emitting surface. Alternatively or additionally, in another operating mode of the light-generating system, the first device light may exit through the first light-emitting surface, and light other than the second device light may exit through the second light-emitting surface. Alternatively or additionally, in another operating mode of the light-generating system, light different from the first device light may exit through the first light-emitting surface, and the second device light may exit through the second light-emitting surface.

[0053] In some embodiments, the light-generating system may include an array of light-generating devices, and the array may include different types of light-generating devices that may be (regularly) distributed on the array. In this way, light with different spectral power distributions may be emitted from the same part of the array depending on the (different) light-generating devices applied. In some embodiments, a first array may be configured upstream of a first light-emitting surface unit to enable generation of a first device light and a light different from the first device light, respectively. In this way, different types of light may be emitted from the first light-emitting surface unit depending on the operation mode of the light-generating system. Alternatively or additionally, a second array may be configured upstream of a second light-emitting surface unit to enable generation of a second device light and a light different from the second device light, respectively. In this way, different types of light may be emitted from the second light-emitting surface unit depending on the operation mode of the light-generating system.

[0054] In some embodiments, one or more portions of the array of light-generating devices may be optically isolated from one or more other portions 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 may be emitted from a first light-emitting surface portion and a second device light may be emitted from a second light-emitting surface portion. However, such a system may also be able to combine different portions over time, allowing control of the shape and / or size of the first and second light-emitting portions. Thus, in certain embodiments, the array may be separated by reflective (or opaque) walls (see also above).

[0055] In some embodiments, optics may be applied to essentially ensure that the first device light can exit the first light-emitting surface portion and / or the second device light can exit the second light-emitting surface portion.

[0056] In some 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 some embodiments, the control system may control the operation of the second light-generating device. In some embodiments, the control system may be configured to (individually) control (or operate in a certain mode of operation) one or more light-generating devices.

[0057] The term "controlling" and similar terms particularly refer to at least determining the behavior of an element or supervising the execution of an element. Thus, in this specification, "controlling" and similar terms may refer to imposing a behavior on an element (determining the behavior of an element or supervising the execution of an element), such as measuring, indicating, activating, opening, shifting, changing temperature, etc. Additionally, the term "controlling" and similar terms may also include monitoring. Thus, the term "controlling" and similar terms may include imposing a behavior on an element, as well as imposing a behavior on an element and monitoring an element. Control of an element can be performed using a control system, which may also be referred to as a "controller." Thus, the control system and the element can be functionally coupled, at least temporarily or permanently. An element may include a control system, although in some embodiments, the control system and the element may not be physically coupled. Control can be performed via wired and / or wireless control. The term "control system" may also refer to a number of 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. A control system may include a user interface or be functionally coupled to a user interface.

[0058] The control system may also be configured to receive and execute commands from a remote control. In some embodiments, the control system may be controlled via an app on a device, such as a portable device, such as a smartphone or iPhone, tablet, etc. Thus, the device may be (temporarily) functionally coupled to the lighting system, although not necessarily coupled to the lighting system.

[0059] Thus, in some embodiments, the control system may be (also) configured to be controlled by an app on a remote device. In such embodiments, the control system of the lighting system may be a slave control system or may be controlled in slave mode. For example, the lighting systems may be identifiable by a code, in particular a unique code for each lighting system. The control system of the lighting system may be configured to be controlled by an external control system that accesses the lighting system based on knowledge entered by a user interface comprising an optical sensor of the (unique) code (e.g., a QR code reader). The lighting system may also include means for communicating with other systems or devices, such as based on Bluetooth, Thread, WIFI, LiFi, ZigBee, BLE, or WiMAX, or another wireless technology.

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

[0061] However, in some embodiments, a control system may be available that is adapted to provide at least the control mode. If other modes are available, selection of such modes may be performed particularly via a user interface, although other options are possible, such as implementing the mode depending on a sensor signal or a (time) scheme. An operational mode may, in embodiments, refer to a system, apparatus, or device that can only operate in a single operational mode (i.e., "on" and without further adjustability).

[0062] Thus, in some embodiments, the control system may rely on one or more of a user interface input signal, a sensor signal (of a sensor), and a timer (or clock module), where the term "timer" may refer to a clock and / or a predetermined timing scheme.

[0063] In summary, in certain embodiments, the light-generating system further includes a control system, which may be 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 some embodiments, the light-producing system may thus include a sensor, which may be configured to generate a sensor signal dependent on the presence of an object within the field of view of the sensor. In particular, the sensor may be configured to detect at least the presence of a human within the field of view of the sensor. In some embodiments, the sensor may be selected from the group including a camera, a passive infrared sensor, an ultrasonic sensor, a microwave sensor, a time-of-flight sensor, and an audio sensor.

[0065] In certain embodiments, the sensor may include a camera, such as a digital camera or a LiDAR, among others. In further embodiments, the sensor may include a passive infrared sensor. In certain embodiments, the sensor may include an ultrasonic sensor. In certain embodiments, the sensor may include an audio sensor. In certain embodiments, the sensor may include a microwave sensor. In certain embodiments, the sensor may include an IR sensor. In certain embodiments, the sensor may include an optical sensor. In certain embodiments, the sensor may include a time-of-flight sensor. The sensor may generate a (corresponding) sensor signal, for example, when observing a person or a moving person. Thus, in certain embodiments, the light-generating system further includes a sensor configured to (i) sense the presence and / or movement of a person and (ii) generate an associated sensor signal, and the control system configured to (individually) control the first light-generating device and the second light-generating device depending on an input signal of the sensor signal. Thus, in certain embodiments, the control system may be configured to (individually) control the first light-generating device and the second light-generating device depending on one or more of a user interface, a sensor signal (of the sensor), and a timer.

[0066] The spectral power distributions of the first device light and the second device light may thus be different. In some embodiments, the spectral power distribution of the lighting module light outcoupled from the light exit window may depend on the spectral power distributions of the first device light and / or the second device light outcoupled from the first light-generating device and / or the second light-generating device. Alternatively or additionally, the radiative flux of the first device light exiting the first light-emitting surface may be controlled depending on the radiative flux of the second device light exiting the second light-emitting surface. Furthermore, 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 may 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 may be controlled depending on a sensor signal (of the sensor (see also above)).

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

[0068] Thus, in some embodiments, the control system may be configured to control the spectral power distribution of the lighting module light. Furthermore, in some embodiments, the control system may 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 certain embodiments, one or more of the first light-generating device and the second light-generating device have controllable correlated color temperatures of the respective device lights, and the control system is configured to control the correlated color temperature of the respective device lights depending on one or more of a user interface, a sensor signal (of a sensor), and a timer (or clock module), particularly depending on the sensor signal in some embodiments.

[0069] In some embodiments, the lighting module may further include a third light-generating device. Furthermore, the light-exit window may, in some embodiments, include a third light-emitting surface portion. In particular, the third light-emitting surface portion may have a third surface area SA3 and a third perimeter (P3). Furthermore, in some embodiments, the third perimeter (P3) may be adjacent to or partially coincident 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 light-emitting surface portions do not include a boundary.

[0070] In other embodiments, a majority of the surface area of ​​the light-exit window may be included in the first, second and third light-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 some embodiments, 0.9*SA0≦SA1+SA2+SA3≦SA0.

[0071] Furthermore, in some embodiments, the third light-generating device may be configured to generate third device light via a third light-emitting surface. Similar to the second light-emitting surface, the third light-emitting surface in some embodiments may have an elliptical cross-sectional shape. Such (i.e., elliptical-shaped) embodiments are described in more detail above. Alternatively, in some embodiments, the third light-generating surface may (also) have an arc-like cross-sectional shape.

[0072] Thus, in some embodiments, the third light emitting surface is configured between the first and second light emitting surfaces, while in alternative embodiments, the second and third light emitting surfaces are separated by the first light emitting surface.

[0073] In particular, in some embodiments, essentially all of the third device light that exits the light-generating system exits through the third light-emitting surface.

[0074] Thus, in certain embodiments, the light-generating system may be configured to generate system light that includes at least a portion of the first device light (emitting from the first light-emitting surface), at least a portion of the second device light (emitting from the second light-emitting surface), and at least a portion of the third device light (emitting from the third light-emitting surface). Thus, in some embodiments, the first device light, second device light, and third device light may be generated simultaneously, among other things.

[0075] Furthermore, in some embodiments, 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 has an elliptical shape, in a first operating mode, the third device light emitted through the third light-emitting surface has the same spectral power distribution as the first device light emitted through the first light-emitting surface. Additionally or alternatively, the control system may operate in a second operating mode, in which the second device light emitted through the second light-emitting surface has the same spectral power distribution as the first device light emitted through the first light-emitting surface, and the third device light emitted through the third light-emitting surface has the same spectral power distribution as the second device light emitted through the second light-emitting surface. In some embodiments, when the third light-emitting surface has an elliptical shape, in the third operating mode, the third device light emitted through the third light-emitting surface may have the same spectral power distribution as the first device light emitted through the first light-emitting surface. Furthermore, in the fourth mode of operation, the third device light emitted through the third light emitting surface may have the same spectral power distribution as the second device light emitted through the second light emitting surface.

[0076] Thus, in certain embodiments, the illumination module further includes a third light-generating device, wherein the light exit window includes a third light-emitting surface portion having a third surface area SA and a third perimeter (P3), the third light-generating device configured to generate third device light through the third light-emitting surface portion, the third light-emitting surface portion having either (i) an elliptical cross-sectional shape or (ii) an arcuate cross-sectional shape, the third perimeter (P3) being tangent to or partially coincident with the window perimeter (P0), and the control system is configured to: when the third light-emitting surface portion has an elliptical cross-sectional shape, in a first operating mode, the third device light exiting through the third light-emitting surface portion has a spectral power distribution identical to a spectral power distribution of the first device light exiting through the first light-emitting surface portion; and in a second operating mode, the third device light exiting through the second light-emitting surface portion has a spectral power distribution identical to a spectral power distribution of the first device light exiting through the first light-emitting surface portion. and, if the third light-emitting surface has an elliptical shape, in a third operating mode, the third device light emitted through the third light-emitting surface has the same spectral power distribution as the first device light emitted through the first light-emitting surface, and in a fourth operating mode, the third device light emitted through the third light-emitting surface has the same spectral power distribution as the second device light emitted through the second light-emitting surface.

[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 a closed space, and one of the walls may, in some embodiments, include a third light-emitting surface. Furthermore, in some embodiments, the other wall of the third light chamber may be reflective. In some embodiments, at least a portion of the third light-generating device may be included in the third light chamber. Thus, third device light (generated by the third light-generating device) may be outcoupled from the third light chamber via the third light-emitting surface. Furthermore, in some embodiments, the third light chamber may not be in optical communication with the first light chamber or the second light chamber.

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

[0079] Alternatively, in some embodiments, the light-generating device may include a third light guide (in addition to the first and second light guides). In particular, the third light guide may include a third light-emitting surface portion. In some embodiments, the third light guide may be configured in a light-receiving relationship with the third light-generating device. Furthermore, in some embodiments, the third light guide may include a third light-emitting light guide surface from which third device light exits during operation of the third light-generating device. In particular, the third light-emitting surface portion may be configured in a light-receiving relationship with the third light-emitting light guide surface or may include the third light-emitting light guide surface. In some embodiments, one or more light guides may not be configured in optical communication with each other. In particular, the first light guide, the second light guide, and the third light guide may not be in optical communication with each other.

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

[0081] Furthermore, in such embodiments, a third light-generating device may be configured outside the third light chamber and may provide third device light to a third light guide. Such embodiments may provide flexibility in the physical location at which the first (or second, or third) light-generating device may be configured relative to the light exit window. As mentioned above, in some embodiments, 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.

[0082] Furthermore, in some embodiments, the luminous exitance of the first device light on the first emitting surface portion or the luminous exitance of the second device light on the second emitting surface portion may vary by less than 5% from the respective average luminous exitance. Furthermore, in some embodiments, the luminous exitance of the second device light on the second emitting surface portion or the luminous exitance of the third device light on the third emitting surface portion may vary by less than 5% from the respective average luminous exitance (see also below). Thus, in some embodiments, one or more of the following may apply: i) the luminous exitance of the first device light on the first emitting surface portion varies by less than 5% from the average luminous exitance on the first emitting surface portion; (ii) the luminous exitance of the second device light on the second emitting surface portion varies by less than 5% from the average luminous exitance on the second emitting surface portion. Where applicable, the following may additionally or alternatively apply: (iii) the luminous emittance of the third device light over the third light-emitting surface portion varies by less than 5% from the average luminous emittance over the third light-emitting surface portion.

[0083] As used herein, controlling a first device light may particularly 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 particularly refer to controlling one or more of the color point and radiant flux of the second device light. Similarly, controlling a third device light may particularly refer to controlling one or more of the color point and radiant flux of the third device light.

[0084] In yet a further aspect, the present invention also provides a lamp or luminaire comprising a light-generating system as defined herein. The luminaire may further comprise a housing, optical elements, louvers, etc. The lamp or luminaire may further comprise a housing enclosing the light-generating system. The lamp or luminaire may have a light window or housing opening in the housing, and the system light may escape from the housing through the light window or housing opening. In yet a further 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 a projection screen. The projection device may comprise one or more light-generating systems as described herein. Thus, in an aspect, the present invention also provides a light-generating device selected from the group of a lamp, a luminaire, a projector device, a disinfection device, a photochemical reactor, and an optical wireless communication device, the light-generating device comprising a light-generating system as defined herein. The light-generating device may include a housing configured to contain or a carrier configured to support one or more elements of the light-generating system.

[0085] In a further aspect, the present invention may provide an indoor space. In some embodiments, the space may include one or more of a wall, a slanted wall, a partition, a roof, a slanted roof, and a ceiling. In particular, the indoor space may further include a light-generating system suspended from the roof, the slanted roof, or the ceiling, or the wall. In other embodiments, the light-generating system may be physically attached to the ceiling or the wall by screws or fasteners. Thus, in this way, the light-generating system may be operatively coupled to the ceiling or the wall. Furthermore, in some embodiments, the light-generating system may illuminate the indoor space with lighting modules, in particular artificial skylight light.

[0086] The term "indoor space" or "space" may relate to (part of) a hospitality area, such as, for example, a restaurant, a hotel, a clinic, or a hospital. The term "space" may also relate to (part of) an office, a department store, a warehouse, a cinema, a church, a theater, a library, etc. However, the term "space" may also relate to (part of) a workspace in a vehicle, such as the cabin of a truck, the cabin of an airplane, the cabin of a ship (boat), the cabin of a car, the cabin of a crane, the cabin of an engineering vehicle such as a tractor, the cabin of a train carriage, etc. The term "space" may also relate to (part of) a workspace, such as an office, a (production) factory, a power plant (nuclear, gas, coal, etc.). For example, the use of "space" The term may refer to a control room, a security room, etc. In particular, the term "space" as used herein may refer to an indoor space. In yet other embodiments, the term "space" may refer to a toilet room or a bathroom. In yet other embodiments, the term "space" may refer to an elevator. In some embodiments, the term "space" may refer to a conference room, a classroom, an indoor foyer, an indoor hallway, an indoor space in a senior care facility, an indoor space in a care facility, etc. In some embodiments, the term "space" may refer to an indoor sports space such as a gym, a sports hall, an indoor ball court, a ballet room, a swimming pool, a changing room, etc. In some embodiments, the term "space" may refer to an (indoor) bar, an (indoor) disco, etc.

[0087] Additionally, in some embodiments, the indoor space may include a control system and, optionally, sensors. Such embodiments are further described above. [Brief explanation of the drawings]

[0088] Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which the drawings are not necessarily to scale. [Figure 1] 1a-1c show different views of a light-generating system 1000 schematically. [Figure 2] 2a-2b illustrate a schematic representation of one embodiment of a light-generating system 1000 including a first light guide 1310 and a second light guide 1320. FIG. [Figure 3] 3a-3b show an embodiment of a light-generating system 1000 including a third light-emitting surface 1130 and a third light-generating device . [Figure 4] 4a-4b show an alternative embodiment of a light-generating system 1000 including a third light-emitting surface 1130 and a third light-generating device . [Figure 5] 5a-5b show a schematic representation of an embodiment of a lighting device 1200 including the light-generating system 1000. In the embodiment shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0089] Figure 1 shows schematically different views of a light-generating system 1000. Figure 1a shows an isometric view of the light-generating system, Figure 1b shows a top view of the light-generating system, and Figure 1c shows a cross-sectional view of the light-generating system.

[0090] In some embodiments, the present invention provides a light-generating system 1000 including an illumination module 1500. Specifically, the illumination module 1500 may include a first light-generating device 110 and a second light-generating device 120 (shown in FIG. 1c). As described above, in some embodiments, 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, and the first device light 111 and the second device light 121 may exit through a light-exit window 1100. In some embodiments, the light-generating system 1000 may be configured to provide illumination module light 1501 (including the first device light 111 and the second device light 121) through the light-exit window 1100. The light generated by the light-generating system 1000 may be specifically referred to as system light 1001. In some embodiments, the system light 1001 may include an illumination module light 1501.

[0091] The surface shape of the light-exit window 1100 can be observed in the top view of the light-generation system 1000 (shown in FIG. 1b). In some embodiments, the light-exit window 1100 may have a window perimeter P0. In the illustrated embodiment, the lighting module 1500 has a circular shape with the perimeter P0. Furthermore, in some embodiments, the light-exit window 1500 may include a first light-emitting surface portion 1110 with a first perimeter P1 and a second light-emitting surface portion 1120 with a second perimeter P2. In particular, the second light-emitting surface portion 1120 may have an elliptical cross-sectional shape. It should be noted that the term "ellipse-like" means that in some embodiments, the shape may be the same as the overlap area of ​​two intersecting circles. Therefore, in such a shape, a major axis and a minor axis may be defined, and thus the shape may be elliptical in this sense. Furthermore, in such a shape, the elliptical cross-sectional shape may have particularly sharp edges. In particular, the elliptical shape may include two pointed ends (as shown in FIG. 1b), i.e., the shape may not be an ellipse (or ellipsoid); rather, the shape may have sharp edges (e.g., resulting from the intersection of two circles).

[0092] The elliptical cross-sectional shape may have a first portion of its perimeter P2 that is tangent to or partially coincident with the window perimeter P0, and a second portion of its perimeter P2 that is tangent to or partially coincident with the first perimeter P1 of the first light-emitting surface portion.

[0093] The interior of the light-generating system 1000 can be observed in a cross-sectional view of the light-generating system 1000 (shown in FIG. 1c). In some embodiments, the first light-generating device 110 may be configured to generate a first device light 111 via a first light-emitting surface portion 1110. Further, in some embodiments, the second light-generating device 120 may be configured to generate a second device light 121 via a second light-emitting surface portion 1120. As mentioned above, in some embodiments, the illumination module 1501 may include one or more of the first device light 111 and the second device light 121.

[0094] In some embodiments, the first device light 111 may be white light having a first correlated color temperature CCT1 of at most 8000 K. A lower CCT value (e.g., lower than 5000 K) may particularly relate to warmer light, such as sunlight. In some embodiments, the second device light 121 may be (i) blue light or (ii) white light having a second correlated color temperature CCT2 of at least 5000 K. A larger CCT in some embodiments may particularly relate to cooler light, such as sky light. As mentioned above, sky light may particularly be blue light, such as the color of the sky on a bright, sunny day. Furthermore, in some embodiments, the first device light 111 and the second device light 121 may both be white light. In such embodiments, when both the first device light 111 and the second device light 121 are white light, CCT2-CCT1≧500 K.

[0095] In some embodiments, the first light-emitting surface portion 1110 and the second light-emitting surface portion 1120 may be configured to share at least a portion of an edge or perimeter. Thus, in some embodiments, the first perimeter P1 and the second perimeter P2 may both abut or partially coincide with the window perimeter P0 (as can be seen in FIG. 1b).

[0096] As described above, in certain embodiments, the second light emitting surface may in particular be elliptical (see FIGS. 1a and 1b). In further embodiments, the second light emitting surface portion 1120 may have a lens-shaped cross-sectional shape. The lens-shaped shape may in particular refer to a shape defined by two intersecting arcs, and in particular, the shape may be convex (i.e., the intersecting arcs are bowed outward). In certain embodiments, the light exit window 1100 may have a circular cross-sectional shape. Further, in certain embodiments, the light exit window 1100 may have a symmetry plane PS (shown in FIG. 1b) that intersects both the first light emitting surface portion 1110 and the second light emitting surface portion 1120.

[0097] In certain embodiments, the optical axis O may be defined at the center of the light exit window 1100 and perpendicular to the light exit window 1100.

[0098] Also, surface areas SA1, SA2, and SA0 are shown in FIG. 1b. In certain embodiments, 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 certain embodiments, the light exit window 1100 may have a surface area SA0. In particular, SA0 = SA1 + SA2.

[0099] Similarly, in certain embodiments, L2 ≦ 0.4 * L1. Here, L1 may refer to the longest dimension of the first light emitting surface portion. In the illustrated embodiment, 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 certain embodiments, L2 may be the longest dimension of the second light emitting surface portion 1120. Thus, in certain embodiments, L2 may be the major axis of the elliptical shape (see FIG. 1b).

[0100] In some embodiments, CCT1 and CCT2 may be defined such that 2700 K≦CCT1≦6500 K, particularly CCT2≧6500 K. In particular, 6500 K≦CCT2≦20000 K. Furthermore, in some embodiments, CCT2−CCT1≧2000 K.

[0101] 1c shows a cross-sectional view, thus providing an illustration of components configured within an embodiment of the light-generating system 1000. In some embodiments, the light-generating system 1000 may include a first light chamber 1210 that includes a first light-emitting surface 1110 and surrounds at least a portion of the first light-generating device 110. Similarly, in some embodiments, the light-generating system may include a second light chamber 1220 that includes a second light-emitting surface 1120 and surrounds at least a portion of the second light-generating device 120. Furthermore, in some embodiments, the light chambers 1210, 1220 may not be configured to be in optical communication with each other. In some embodiments, the light chambers 1210, 1220 may be separated by a (diffuse) reflector.

[0102] In an embodiment, the light exit window 1100 may include a light diffuser 410. In particular, the light diffuser 410 may include a first light emitting surface portion 1110 and a second light emitting surface portion 1120. In an embodiment, the light diffuser 410 configured above the first light chamber 1210 may not be in optical communication with the light diffuser 410 configured above the second light chamber 1220. In an embodiment, these may be separated by a (diffusing) reflector.

[0103] In some embodiments, the first light chamber 1210 may contain at least a portion of the plurality of first light-generating devices 110. In further embodiments, the second light chamber 1220 may contain at least a portion of the plurality of second light-generating devices 120.

[0104] In some embodiments, the light-generating system 1000 may further include a sensor 310 (shown in FIG. 1c). 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 human being and (ii) generate an associated sensor signal. Furthermore, in some embodiments, 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).

[0105] The height of the module 1500, indicated by reference character H1, may be selected from the range of, for example, 1 to 100 mm, and may be, for example, within the range of 5 to 20 mm.

[0106] Figure 2 shows a schematic representation of one embodiment of a light-generation system 1000 including a first light guide 1310 and a second light guide 1320. Figure 2a shows an isometric view and Figure 2b shows a top view of the light-generation system 1000.

[0107] In the illustrated embodiment, the light-generation system 1000 may include a first light guide 1310 and a second light guide 1320. In some embodiments, the first light guide 1310 may be configured in light-receiving relationship with the first light-generating device 110. Furthermore, the first light guide 1310 may include a first light-emitting light guide surface 1311 from which the first device light 111 exits during operation of the first light-generating device 110. More particularly, the first light-emitting surface portion 1110 may be configured in light-receiving relationship with or may include the first light-emitting light guide surface 1311. That is, the first light-generating device 110 may direct the first device light 111 into the first light guide 1310, whereupon the first device light 111 may be outcoupled via the light exit window 1100.

[0108] Similarly, in some embodiments, the second light guide 1320 may be configured in light-receiving relationship with the second light-generating device 120. In particular, the second light guide 1320 may include a second light-emitting light guide surface 1321 from which the second device light 121 exits during operation of the second light-generating device 120. More particularly, the second light-emitting surface portion 1120 may be configured in light-receiving relationship with or may include the second light-emitting light guide surface 1321. That is, the second light-generating device 120 may direct the second device light 121 into the second light guide 1320, which may then be outcoupled via the light exit window 1100.

[0109] Furthermore, in some embodiments, the light guides 1310, 1320 may not be configured to be in optical communication with each other. It should be noted that in the illustrated embodiment, the light-generating device 1000, including the first light guide 1310 and the second light guide 1320, may be co-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 may be configured outside the lighting module 1500. Thus, the first light-generating device 110 and the second light-generating device 120 may illuminate the first light guide 1310 and the second light guide 1320 from the outside, respectively. Furthermore, in some embodiments, the light guides 1310, 1320 may be separated by a (specular) reflector. Thus, optical communication between the first light guide 1310 and the second light guide 1320 is prevented.

[0110] In the illustrated embodiment, the first light guide 1310 and the second light guide 1320 may be separated, i.e., not in physical contact. This can be observed in both Figures 2a and 2b, although in the illustrated embodiment, both the first perimeter P1 and the second perimeter P2 may abut or partially coincide with the window perimeter P0.

[0111] 1 , in the illustrated 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 human being, and (ii) generate an associated 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).

[0112] Furthermore, in some embodiments, 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.

[0113] In some embodiments, 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 in dependence on a sensor signal.

[0114] Figure 3 shows an embodiment of a light-generating system 1000 including a third light-emitting surface 1130 and a third light-generating device 130. Figures 3a and 3b show a cross-sectional view and a top view of the light-generating system 1000.

[0115] FIG. 3a shows a cross-sectional view, thus providing a view of the components configured inside an embodiment of the light generation system 1000. In one embodiment, the light generation system 1000 may include a first light emitting surface portion 1110 and may include a first optical chamber 1210 that surrounds at least a portion of the first light generation device 110. Similarly, in one embodiment, the light generation system 1000 may include a second light emitting surface portion 1120 and may include a second optical chamber 1220 that surrounds at least a portion of the second light generation device 120. Further, in one embodiment, the light generation system 1000 may include a third light emitting surface portion 1130 and may include a third optical chamber 1230 that surrounds at least a portion of the third light generation device 130.

[0116] Further, in one embodiment, the optical chambers 1210, 1220, and 1230 may not be configured to optically communicate with each other. However, a light diffuser 410 such as that shown in FIG. 3A may be a single diffuser, and thus, portions of the light diffuser 410 configured above the first optical chamber 1210, the second optical chamber 1220, and the third optical chamber 1230 may optically communicate with each other. In one embodiment, the light diffuser 410 may include the first light emitting surface portion 1110, the second light emitting surface portion 1120, and the third light emitting surface portion 1130.

[0117] In one embodiment, the third light emitting surface portion 1130 may have a third surface area SA3 and a third perimeter P3. In one embodiment, the third light generation device 130 may be configured to generate a third device light 131 (shown in FIG. 3a) via the third light emitting surface portion 1130. In particular, the third light emitting surface portion 1130 may have an elliptical cross-sectional shape (as shown in FIG. 3b). Further, in one embodiment, the third perimeter P3 may be in contact with or may partially coincide with the window perimeter P0.

[0118] In some embodiments, the control system 300 may be configured to control the light-generating devices 110, 120, 130. In particular, if the third light-emitting surface 1130 has an elliptical shape, in a first mode of operation, the third device light 131 may exit through the third light-emitting surface 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 exiting through the first light-emitting surface 1110.

[0119] Furthermore, in some embodiments, in the second mode of operation, the second device light 121 emitted through the second emitting surface 1120 may have the same spectral power distribution as the first device light 111 emitted through the first emitting surface 1110. Furthermore, in some embodiments, the third device light 131 emitted through the third emitting surface 1130 may have the same spectral power distribution as the second device light 121 emitted through the second emitting surface 1120.

[0120] In some embodiments, where the third light emitting surface 1130 may have an elliptical shape, in a third operating mode, the third device light 131 emitted through the third light emitting surface 1130 may have the same spectral power distribution as the first device light 111 emitted through the first light emitting surface 1110. Furthermore, in some embodiments, in a fourth operating mode, the third device light 131 emitted through the third light emitting surface 1130 may have the same spectral power distribution as the second device light 121 emitted through the second light emitting surface 1120.

[0121] An embodiment of the light-generating system 1000 comprising three light-emitting surfaces may comprise a light-exit window 1100 having a surface area SA0. In particular, SA0=SA1+SA2+SA3.

[0122] In some embodiments, there may be a variation in the luminous emittance of the first device light 111 across the first emitting surface portion 1110. Alternatively, in some embodiments, there may be a variation in the luminous emittance of the second device light 121 across the second emitting surface portion 1120, which may be less than 5% from the respective average luminous emittance.

[0123] Furthermore, as mentioned above, the light-generating system 1000 may include a control system 300 that (individually) controls 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, and the control system 300 may control the light-generating system 1000 depending on the sensor signal.

[0124] Figure 4 shows an alternative embodiment of a light-generating system 1000 including a third light-emitting surface 1130 and a third light-generating device 130. Figure 4a shows a top view of one embodiment of the light-generating system 1000, and Figure 4b shows a cross-sectional view thereof. In some embodiments, the third light-emitting surface 1130 may (also) have an arcuate cross-sectional shape (as shown in Figure 4a).

[0125] In some embodiments, 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 have surface areas SA1, SA2, and SA3, respectively. In particular, SA0 = SA1 + SA2 + SA3.

[0126] Furthermore, as shown in the cross-sectional view (see FIG. 4b), in some embodiments, the light-generating system 1000 may include a first light chamber 1210, a second light chamber 1220, and a third light chamber 1230, which may not be in optical communication with each other.

[0127] In some embodiments, the first light chamber 1210, the second light chamber 1220, and the third light chamber 1230 (each) may enclose one or more first light-generating devices 110, one or more second light-generating devices 120, and one or more third light-generating devices 130, respectively. In particular, the first light-generating devices 110, the second light-generating devices 120, and the third light-generating devices 130 may generate first device light 111, second device light 121, and third device light 131, respectively. In particular, the system light 1001 may include the first device light 111, the second device light 121, and the third device light 131.

[0128] Referring to Figures 3b and 4a, in one embodiment, the third light-emitting surface portion is configured between the first light-emitting surface portion and the second light-emitting surface portion, and 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.

[0129] Other aspects defined in connection with the other embodiments described above may also apply to the present invention, and these features will not be repeated for the sake of brevity, however, and do not (nor) limit the scope of the features described herein.

[0130] FIG. 5a schematically illustrates an embodiment of a lighting device 1200 including a light-generating system 1000. The schematic diagram is not necessarily to scale. In some embodiments, the present invention may provide an indoor space 1300 including a ceiling 1310 and the light-generating system 1000. In particular, a lighting module 1500 may be operatively coupled to the ceiling 1310. Furthermore, in some embodiments, the light-generating system may further include a control system 300 and a sensor 310. Accordingly, FIG. 5a schematically illustrates an embodiment of a lighting device 1200 selected from the group consisting of a lamp 1, a lighting fixture 2, a projector device 3, a disinfection device, a photochemical reactor, and an optical wireless communication device, including the light-generating system 1000 described herein. In some embodiments, such a lighting device may be a lamp 1, a lighting fixture 2, a projector device 3, a disinfection device, or an optical wireless communication device. Light escaping from the lighting device 1200 is indicated by reference numeral 1201. The lighting device light 1201 may consist essentially of the system light 1001 and thus, in certain embodiments, may be the system light 1001. In some embodiments, the light-generating device 1200 may be configured to provide the system light 1001 to one or more surfaces in a room 1300. In particular, the light-generating system 1000 may illuminate a wall 1307, or a floor 1305, or a ceiling 1310 in the room 1300. Reference numeral 301 denotes a user interface which may be operatively coupled to a control system 300 included in or operatively coupled to the light-generating system 1000.

[0131] 5B shows a schematic representation of a hallway. The hallway may include a window. Optionally, the hallway may include a lighting module (not shown) operatively coupled to the (side) wall 1307. This may also mimic a window. Here, multiple modules 1500 are shown operatively coupled to the ceiling 1310. Here, three modules 1500 are shown by way of example, but a single module 1500, two modules 1500, or four or more modules 1500 may also be used. By way of example only, the modules have different shapes.

[0132] The term "plurality" refers to two or more.

[0133] The terms "substantially" or "essentially" used herein will be understood by those skilled in the art. The terms "substantially" or "essentially" may also include embodiments with "entirely," "completely," "all," etc. Thus, in embodiments, the adjective "substantially" or "essentially" may be omitted. Where applicable, the terms "substantially" or "essentially" may also relate to 90% or more, including 100%, such as 95% or more, particularly 99% or more, and more particularly 99.5% or more.

[0134] The term "comprise" also includes embodiments in which the term "comprise" means "consists of."

[0135] 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 may refer to one or more of items 1 and 2. The term "comprising" may, in one embodiment, refer to "consisting of," but in another embodiment may also refer to "including at least the defined species, and optionally one or more other species."

[0136] Furthermore, terms such as first, second, third, etc. in the specification and claims are used to distinguish between similar elements and not necessarily to describe a sequential or chronological order. The terms so used are interchangeable under appropriate circumstances, with the understanding that the embodiments of the invention described herein are capable of operating in other sequences than those described or illustrated herein.

[0137] Devices, apparatus, or systems are described herein, inter alia, in operation. As will be apparent to those skilled in the art, the present invention is not limited to methods of operation or devices, apparatus, or systems in operation.

[0138] It should be noted that the above-described embodiments are illustrative rather than limiting of the present invention, and that those skilled in the art can design many alternative embodiments without departing from the scope of the appended claims.

[0139] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0140] Use of the verb "to comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly indicates otherwise, throughout the specification and claims, the words "comprise", "comprising", and the like should be interpreted in their inclusive sense, i.e., "including, but not limited to", rather than their exclusive or exhaustive sense.

[0141] The singular reference of an element does not exclude the presence of a plurality of such elements.

[0142] The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a device, apparatus, or system claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain means are recited in mutually different dependent claims does not indicate that a combination of these means cannot be used to advantage. In yet another aspect, the invention thus provides a software product which, when run on a computer, is capable of implementing (one or more embodiments of) the method as described herein.

[0143] The present invention also provides a control system that can control a device, apparatus, or system or that can perform the methods or processes described herein. Still further, the present invention also provides a computer program product that, when executed on a computer operatively coupled to or included in a device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system.

[0144] The present invention further applies to a device, apparatus or system comprising one or more of the features described in the present specification and / or shown in the accompanying drawings. The present invention further relates to a method or process comprising one or more of the features described in the present specification and / or shown in the accompanying drawings.

[0145] The various aspects discussed in this patent may be combined to provide additional advantages. Moreover, those skilled in the art will appreciate that embodiments may be combined, and that three or more embodiments may be combined. Furthermore, some of the features may form the basis for one or more divisional applications.

Claims

1. a light-generating system including an illumination module, the illumination module including a skylight module, the illumination module including a first light-generating device, a second light-generating device, and a light-exit window, the light-generating system configured to provide illumination module light through the light-exit window; the light exit window has a window perimeter and includes (i) a first light emitting surface portion having a first perimeter and (ii) a second light emitting surface portion having a second perimeter, the second light emitting surface portion having an elliptical cross-sectional shape; the first light-generating device is configured to generate first device light through the first light-emitting surface portion, and the second light-generating device is configured to generate second device light through the second light-emitting surface portion; the first device light is white light having a first correlated color temperature CCT1 of at most 8000K, and the second device light is (i) blue light or (ii) white light having a second correlated color temperature CCT2 of at least 5000K, and when both the first device light and the second device light are white light, CCT2-CCT1≧500K; The light-producing system, wherein both the first perimeter and the second perimeter abut or partially coincide with the window perimeter.

2. The light production system of claim 1 , wherein the elliptical shape includes two pointed ends.

3. The light generating system of claim 1 or 2, wherein the second light emitting surface has a lenticular cross-sectional shape.

4. 4. The light generation system of claim 1, wherein the light exit window has a circular cross-sectional shape, the light exit window having a plane of symmetry that intersects both the first light emitting surface portion and the second light emitting surface portion.

5. 5. The light-generating system of claim 1, comprising: i) a first light chamber comprising the first light-emitting surface portion and surrounding at least a portion of the first light-generating device; and (ii) a second light chamber comprising the second light-emitting surface portion and surrounding at least a portion of the second light-generating device, the light chambers not being configured to be in optical communication with each other.

6. The light-generating system of claim 5 , wherein the light exit window comprises a light diffuser, the light diffuser comprising the first light-emitting surface portion and the second light-emitting surface portion.

7. The light production system includes a first light guide and a second light guide; the first light guide is arranged in light-receiving relationship with the first light-generating device, the first light guide including a first light-emitting light guide surface from which the first device light exits during operation of the first light-generating device, and the first light-emitting surface portion is arranged in light-receiving relationship with or includes the first light-emitting light guide surface; the second light guide is arranged in light-receiving relationship with the second light-generating device, the second light guide including a second light-emitting light guide surface from which the second device light exits during operation of the second light-generating device, and the second light-emitting surface portion is arranged in light-receiving relationship with or includes the second light-emitting light guide surface; 5. The light-generating system of claim 1, wherein the light guides are not configured to be in optical communication with each other.

8. 8. The light-generating system of claim 1, further comprising a control system 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.

9. 9. The light-generating system of claim 8, further comprising a sensor configured to (i) sense human presence and / or movement and (ii) generate an associated sensor signal, and wherein the control system is configured to individually control the first light-generating device and the second light-generating device.

10. 10. The light-generating system of claim 8 or 9, wherein one or more of the first light-generating device and the second light-generating device have a controllable spectral power distribution of the respective device light, and the control system is configured to control the spectral power distribution of the respective device light.

11. 11. The light-generating system of claim 8, wherein 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, and the control system is configured to control the correlated color temperature of the respective device light.

12. the lighting module further comprises a third light-generating device; the light exit window includes a third light emitting surface portion having a third surface area and a third perimeter; the third light-generating device is configured to generate third device light via the third light-emitting surface; the third light-emitting surface portion has (i) an elliptical cross-sectional shape or (ii) an arcuate cross-sectional shape, and the third perimeter is tangent to or coincides with the window perimeter; The control system is configured such that (I) when the third light emitting surface has an elliptical shape, in a first operating mode, the third device light emitted through the third light emitting surface has the same spectral power distribution as the first device light emitted through the first light emitting surface, and in a second operating mode, the second device light emitted through the second light emitting surface has the same spectral power distribution as the first device light emitted through the first light emitting surface, and the third device light emitted through the third light emitting surface has the same spectral power distribution as the first device light emitted through the second light emitting surface. and (II) when the third light emitting surface has an elliptical shape, in a third operating mode, the third device light emitted through the third light emitting surface has the same spectral power distribution as the first device light emitted through the first light emitting surface, and in a fourth operating mode, the third device light emitted through the third light emitting surface has the same spectral power distribution as the second device light emitted through the second light emitting surface.

12. The light-generating system of claim 8, configured to control the light-generating device so that

13. 13. A light-generating system according to any one of claims 1 to 12, wherein one or more of the following applies: (i) the variation in luminous exitance of the first device light on the first light-emitting surface portion is less than 5% from the respective average luminous exitance; (ii) the variation in luminous emittance of the second device light on the second light-emitting surface portion is less than 5% from the respective average luminous emittance;

14. 14. An indoor space comprising a ceiling and a light production system according to any one of claims 1 to 13, wherein the lighting module is operatively coupled to the ceiling.

15. 15. The indoor space of claim 14, further comprising a control system configured to individually control the lighting modules depending on one or more of an input signal of a user interface, a sensor signal of a sensor, and a timer.

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