Light exit window with adjustable contrast sensitivity

Abstract

The invention provides a light generating system (1000) comprising a first light generating device (110) and a unit (1100), wherein: (a) the first light generating device (110) is configured to provide first device light (111) having a wavelength in the visible wavelength range; (b) the cell (1100) comprises, in a cross-sectional view, an open hollow portion (400) and a closed hollow portion (500); wherein the unit (1100) comprises a viewer side (1101); wherein the open hollow portion (400) is concave relative to the viewer side (1101); (c) the open hollow portion (400) comprises a first wall portion (451); wherein the first wall portion (451) is diffusely reflective for the first device light (111); (d) the closed hollow portion (500) comprises a chamber wall (501) comprising (a) a second wall portion (452), where the second wall portion (452) is translucent to the first device light (111), and (b) a chamber wall portion (453), where the chamber wall portion (453) is diffusely reflective to the first device light (111); (e) the unit (1100) comprises a wall element (450) comprising a first wall portion (451) and a second wall portion (452); (f) the first light generating device (110) is arranged in the open hollow portion (400); wherein the first light generating device (110) is configured to illuminate (i) at least a portion of the first wall portion (451) and (ii) at least a portion of the second wall portion (452); and (g) the unit (1100) and the first light generating device (110) are configured such that the first device light (111) does not escape directly from the viewer side (1101); and wherein the closed hollow portion (500) is configured such that at least a portion of the first device light (111) enters the closed hollow portion.

Description

Technical Field

[0001] The invention relates to a light generating system and to a lighting device comprising such a light generating system. The invention also relates to a space comprising such a light generating system. The invention further relates to a method for manufacturing such a light generating system. Background Art

[0002] Illumination systems simulating natural lighting (particularly daylight lighting) are known in the prior art. For example, US2017051893 describes an illumination system comprising: a light source for providing a beam of directional non-diffuse light having a first correlated color temperature along a main beam direction, wherein the propagation direction of the directional non-diffuse light is modified on the beam and is substantially parallel to the main beam direction in the interior area and is increasingly inclined relative to the main beam direction as the distance from the interior area increases; and a lampshade-like structure comprising a bottom unit to be illuminated by the light source on one side and a screen structure arranged on the other side, the bottom unit and the screen structure defining a light channel, wherein: the bottom unit comprises a diffuse light generator for generating diffuse light at a second correlated color temperature greater than the first correlated color temperature; the bottom unit is at least partially transparent to the directional non-diffuse light of the beam; the bottom unit is configured so that at least a divergent beam portion of the beam enters the light channel; and the screen structure is spatially oriented relative to the main beam direction of the divergent beam portion to be illuminated by at least a portion of the divergent beam portion, thereby providing an illuminated screen portion acting as a diffuse light source. Summary of the invention

[0003] It seems desirable to have large emitting surfaces with low contrast modulation because there are no interfering optical seams. Contrast sensitivity is the ability to detect subtle differences in shadows and patterns. For certain applications, such as when using large emitting surfaces, it seems desirable to detect objects without clear outlines and to discern objects or details from their background. In lighting, contrast sensitivity is a measure of the level of discomfort caused by the repetition and alternation of bright illuminating surfaces of a given size and seams that are usually darker and smaller in size. The alternating repetition of (relatively) bright parts and less bright parts is called a cycle. The number of cycles per degree of viewing angle is called the spatial frequency. The most disturbing spatial frequencies seem to be in the range of about 2-4 cycles / degree. One of the challenges associated with large and very large emitting surfaces is their absolute size. As can be appreciated, size inherently complicates the processing, handling, torque and stiffness of the frame members for building optical mixing boxes, packaging, transportation and on-site installation (e.g., including lifting and slinging of assembled luminaires). Remarkably, most of these challenges inherently stem from customer expectations for seamless optical surfaces. Therefore, an alternative means is needed to reduce contrast sensitivity.

[0004] Known means and methods of reducing contrast modulation or sensitivity to acceptable levels include increasing the area of ​​brighter and / or less bright surfaces, or dimming the light flux of the light exit window, or increasing the reflectivity of the less bright optical seam.

[0005] In order to get rid of the dull space, different architectural ceilings have been developed. However, many of the proposed designs still combine traditional lighting equipment with contemporary ceiling architecture, so that the challenge of contrast sensitivity still persists. For example, the ceiling can be constructed of large, modular, S-shaped concrete elements that overlap to build a part of the open optical cavity, i.e. a curved cove lamp. Due to its absolute size and the viewing distance to the ceiling, the contrast sensitivity of such a ceiling can be advantageously improved towards lower spatial frequencies. However, this type of ceiling can also have a series of disadvantages. First, the lower part of the overlapping S-shaped elements may be open, so the optical efficiency of the cove lamp is low. Secondly, the ceiling may still suffer from the problem of contrast sensitivity. In addition, the level of contrast modulation may depend on the viewing direction. Thirdly, the size of the S-shaped structure cannot be reduced without cost. The contrast sensitivity of the structure may depend on its spatial frequency. Therefore, when the distance to the ceiling is reduced to office standards and the size of the S-shape is scaled to match the size of the office ceiling grid, the worst possible modulation of 2-4 cycles / degree appears. However, due to the available cove depth or the space behind the ceiling, a reduction of the S-shape, for example, may be required. This space typically houses infrastructure components such as air ducts, heating systems, sprinklers and plumbing, ventilation ducts, and the like.

[0006] Therefore, there is still a need to significantly improve the scaling (reduction) of the design, the contrast sensitivity depending on the size, and the optical efficiency of the indirectly illuminated cavity. Therefore, one aspect of the present invention is to provide an alternative light generating system, which preferably further at least partially eliminates one or more of the above-mentioned disadvantages. It may be an object of the present invention to overcome or ameliorate at least one disadvantage of the prior art, or to provide a useful alternative.

[0007] According to a first aspect, the present invention provides a light generating system comprising a first light generating device and a unit. In particular, the first light generating device may be configured to provide a first device light having a wavelength in the visible wavelength range. In addition, in an embodiment, the unit may include an open hollow portion and a closed hollow portion in a cross-sectional view. In particular, the unit may include a viewer side. The open hollow portion may be concave relative to the viewer side. In addition, in an embodiment, the open hollow portion may include a first wall portion. In particular, the first wall portion may be diffusely reflective for the first device light. In an embodiment, the closed hollow portion may include a chamber wall, the chamber wall including (a) a second wall portion, and (b) a chamber wall portion. In particular, the second wall portion may be translucent for the first device light. In addition, in an embodiment, the chamber wall portion may be diffusely reflective for the first device light. In a specific embodiment, the unit may include a wall element, the wall element including a first wall portion and a second wall portion. In a specific embodiment, the first light generating device may be configured in the open hollow portion. In an embodiment, the first light generating device may be configured to illuminate (i) at least a portion of the first wall portion and (ii) at least a portion of the second wall portion. Furthermore, in an embodiment, the unit and the first light generating device may be configured such that the first device light does not (substantially) escape directly from the viewer side. However, in an embodiment, the closed hollow portion may be configured such that at least a portion of the first device light entering the closed hollow portion via the second wall portion also escapes via the second wall portion. Therefore, in an embodiment, the present invention provides a light generating system comprising a first light generating device and a unit, wherein: (a) the first light generating device is configured to provide a first device light having a wavelength in the visible wavelength range; (b) the unit comprises an open hollow portion and a closed hollow portion in a cross-sectional view; wherein the unit comprises a viewer side; wherein the open hollow portion is concave relative to the viewer side; (c) the open hollow portion comprises a first wall portion; wherein the first wall portion is diffusely reflective for the first device light; (d) the closed hollow portion comprises a chamber wall, which comprises (i ) a second wall portion, wherein the second wall portion is translucent for the first device light, and (ii) a chamber wall portion, wherein the chamber wall portion is diffusely reflective for the first device light; (e) the unit comprises a wall element, the wall element comprising the first wall portion and the second wall portion; (f) the first light generating device is arranged in the open hollow portion; wherein the first light generating device is arranged to illuminate (i) at least a portion of the first wall portion and (ii) at least a portion of the second wall portion; and (g) the unit and the first light generating device are arranged such that the first device light does not (substantially) escape directly from the viewer side. In particular, the closed hollow portion can be configured such that at least a portion of the first device light entering the closed hollow portion via the second wall portion also escapes via the second wall portion.

[0008] With such a system, scalability may be possible in the direction of enlargement and in the direction of reduction. It is possible to further reduce the contrast sensitivity. In an embodiment, it may also be possible to control the light distribution on the wall elements. Furthermore, by controlling the shape and texture, different optical effects may be produced.

[0009] As can be gathered from the above, a light generating system may comprise a light generating device.

[0010] The light generating device may in particular be configured to generate device light. In particular, the light generating device may comprise a light source. The light source may in particular be configured to generate light source light. In embodiments, the device light may consist essentially of the device light. In other embodiments, the device light may consist essentially of converted light source light. In yet other embodiments, the device light may comprise (unconverted) light source light and converted light source light. The light source light may be converted into luminescent material light with a luminescent material and / or into upconverted light with an upconverter (see also below). The term "light generating device" may also refer to a plurality of light generating devices that may provide device light having substantially the same spectral power distribution. In specific embodiments, the term "light generating device" may also refer to a plurality of light generating devices that may provide device light having different spectral power distributions (see also further below).

[0011] The term "light source" may in principle relate to any light source known in the art. It may be a conventional (tungsten) bulb, a low-pressure mercury lamp, a high-pressure mercury lamp, a fluorescent lamp, an LED (light emitting diode). In a specific embodiment, the light source comprises a solid-state LED light source (such as an LED or a laser diode (or "diode laser")). The term "light source" may also relate to a plurality of light sources, for example 2-2000 (solid-state) LED light sources. Therefore, the term LED may also refer to a plurality of LEDs. In addition, the term "light source" may also refer to a so-called chip-on-board (COB) light source in an embodiment. The term "COB" refers in particular to an LED chip in the form of a semiconductor chip, which is neither packaged nor connected, but is directly mounted on a substrate such as a PCB. Therefore, a plurality of light-emitting semiconductor light sources may be configured on the same substrate. In an embodiment, a COB is a plurality of LED chips configured together into a single lighting module.

[0012] The light source may have a light escape surface. With reference to a conventional light source, such as a light bulb or a fluorescent lamp, this may be the outer surface of a glass or quartz housing. For an LED, this may be, for example, the LED die, or the outer surface of a resin when the resin is applied to the LED die. In principle, it may also be the end of an optical fiber. The term escape surface particularly relates to a part of the light source, where light actually leaves or escapes from the light source. The light source is configured to provide a light beam. The light beam (therefore) escapes from the light exit surface of the light source.

[0013] Likewise, the light generating device may comprise a light escape surface, such as an end window. Furthermore, likewise, the light generating system may comprise a light escape surface, such as an end window.

[0014] The term "light source" or "light generating device" may refer to a semiconductor light emitting device, such as a light emitting diode (LED), a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSEL), an edge emitting laser, etc. The term "light source" may also refer to an organic light emitting diode (OLED), such as a passive matrix organic light emitting diode (PMOLED) or an active matrix organic light emitting diode (AMOLED). In a specific embodiment, the light source includes a solid-state light source (such as an LED or a laser diode). In one embodiment, the light source includes an LED (light emitting diode). The term "light source" or "solid-state light source" may also refer to a superluminescent diode (SLED).

[0015] The term LED may also refer to a plurality of LEDs.

[0016] The term "light source" may also relate to a plurality of (substantially identical (or different)) light sources, such as 2-2000 solid-state light sources. In an embodiment, the light source may comprise one or more micro-optical elements (micro-lens arrays) downstream of a single solid-state light source (such as an LED) or downstream of a plurality of solid-state light sources (i.e., for example shared by a plurality of LEDs). In an embodiment, the light source may comprise an LED with on-chip optics. In an embodiment, the light source comprises a pixelated single LED (with or without optics) (on-chip beam control is provided in an embodiment).

[0017] In an embodiment, the light source may be configured to provide primary radiation, which is used as such, such as, for example: a blue light source, such as a blue LED; or a green light source, such as a green LED; and a red light source, such as a red LED. Such LEDs that may not include a luminescent material ("phosphor") may be denoted as direct color LEDs.

[0018] However, in other embodiments, the light source may be configured to provide primary radiation, and a portion of the primary radiation is converted into secondary radiation. The secondary radiation may be based on the conversion of the luminescent material. The secondary radiation may therefore also be indicated as luminescent material radiation. In an embodiment, the luminescent material may be included by the light source, such as an LED having a luminescent material layer or a dome including luminescent material. Such an LED may be represented as a phosphor conversion LED or a PC LED (phosphor conversion LED). In other embodiments, the luminescent material may be configured at a distance ("far away") from the light source, such as an LED having a luminescent material layer that is not in physical contact with the die of the LED. Therefore, in a specific embodiment, the light source may be a light source that emits at least light of a wavelength selected from the range of 380-470nm during operation. However, other wavelengths may also be possible. This light may be partially used by the luminescent material.

[0019] In an embodiment, the light generating device may include a luminescent material. In an embodiment, the light generating device may include a PCLED. In other embodiments, the light generating device may include a direct LED (i.e., without a phosphor). In an embodiment, the light generating device may include a laser device, such as a laser diode. In an embodiment, the light generating device may include a super luminescent diode. Thus, in a specific embodiment, the light source may be selected from the group of a laser diode and a super luminescent diode. In other embodiments, the light source may include an LED.

[0020] The light source may in particular be configured to generate a source light having an optical axis (O) (beam shape) and a spectral power distribution. In an embodiment, the source light may comprise one or more bands having a known bandwidth of the laser.

[0021] The term "light source" may (thus) refer to such a light generating element, such as, for example, a solid-state light source, or, for example, to a package of a light generating element (such as a solid-state light source) and one or more luminescent material containing elements and (other) optical devices (such as lenses, collimators). A light converter element ("converter element" or "converter") may include a luminescent material containing element. For example, a solid-state light source like a blue LED is a light source. A combination of a solid-state light source (as a light generating element) and a light converter element (such as a blue LED and a light converter element) optically coupled to the solid-state light source may also be a light source (but may also be denoted as a light generating device). Thus, a white LED is a light source (but may, for example, also be denoted as a (white) light generating device).

[0022] The term "light source" herein may also refer to light sources including solid state light sources, such as LEDs or laser diodes or super luminescent diodes.

[0023] In embodiments, the term "light source" may (therefore) also refer to a light source that is (also) based on light conversion, such as a light source in combination with a luminescence conversion material. Thus, the term "light source" may also refer to a combination of an LED and a luminescent material configured to convert at least part of the LED radiation, or to a combination of a (diode) laser and a luminescent material configured to convert at least part of the (diode) laser radiation.

[0024] In an embodiment, the term "light source" may also refer to a combination of a light source (such as an LED) and a filter, which may change the spectral power distribution of the light generated by the light source. In particular, the term "light generating device" may be used to refer to a light source as well as additional (optical components) such as filters and / or beam shaping elements, etc.

[0025] In an embodiment, the phrase "different light sources" or "multiple different light sources" and similar phrases may refer to multiple solid-state light sources selected from at least two different bins. Similarly, the phrase "same light source" or "multiple same light sources" and similar phrases may refer to multiple solid-state light sources selected from the same bin in an embodiment.

[0026] The terms "solid-state light source" or "solid-state material light source" and similar terms may particularly refer to semiconductor light sources, such as light emitting diodes (LEDs), diode lasers or superluminescent diodes.

[0027] As described above, the light generating system may include a first light generating device. The term "first light generating device" may also refer to a plurality of substantially identical first light generating devices, such as a plurality of identical light generating devices (such as from the same partition), or a plurality of light generating devices having substantially the same functionality. In this document, in an embodiment, the function of (one or more) first light generating devices is to irradiate (i) at least a portion of the first wall portion and (ii) at least a portion of the second wall portion (see also further below). In addition, in an embodiment, the first light generating device may be configured to provide a first device light having a wavelength in the visible wavelength range. However, there may also be a plurality of first light generating devices, one or more of (i) of which are configured to generate visible light, and one or more of (ii) of which are configured to generate IR radiation and / or one or more of which are configured to generate UV radiation.

[0028] The terms "visible," "visible light," or "visible emission," and similar terms, refer to light having one or more wavelengths in the range of approximately 380-780 nm.

[0029] In this context, UV may particularly refer to a wavelength selected from the range of 190-380 nm, such as 200-380 nm. In this context, UV (ultraviolet) may particularly refer to a wavelength selected from the range of 190-380 nm, although in specific embodiments, other wavelengths may also be possible.

[0030] In this document, IR (infrared) may particularly refer to radiation having a wavelength selected from the range of 780-3000 nm, such as 780-2000 nm, for example up to a wavelength of about 1500 nm, such as a wavelength of at least 900 nm, although in specific embodiments, other wavelengths may also be possible. Thus, the term IR may herein refer to one or more of near infrared (NIR (or IR-A)) and short wavelength infrared (SWIR (or IR-B)), particularly NIR.

[0031] The terms "light" and "radiation" are used interchangeably herein, unless it is clear from the context that the term "light" refers only to visible light. The terms "light" and "radiation" may thus refer to UV radiation, visible light, and IR radiation. In specific embodiments, particularly for lighting applications, the terms "light" and "radiation" refer to (at least) visible light.

[0032] The terms "violet light" or "violet emission" and similar terms may particularly relate to light having a wavelength in the range of about 380-440 nm. In a specific embodiment, the violet light may have a centroid wavelength in the range of 380-440 nm. The terms "blue light" or "blue emission" and similar terms may particularly relate to light having a wavelength in the range of about 440-490 nm (including some violet and cyan hues). In a specific embodiment, the blue light may have a centroid wavelength in the range of 440-490 nm. The terms "green light" or "green emission" and similar terms may particularly relate to light having a wavelength in the range of about 490-560 nm. In a specific embodiment, the green light may have a centroid wavelength in the range of 490-560 nm. The terms "yellow light" or "yellow emission" and similar terms may particularly relate to light having a wavelength in the range of about 560-590 nm. In a specific embodiment, the yellow light may have a centroid wavelength in the range of 560-590 nm. The terms "orange light" or "orange emission" and similar terms may particularly relate to light having a wavelength in the range of about 590-620 nm. In a specific embodiment, the orange light may have a centroid wavelength in the range of 590-620 nm. The terms "red light" or "red emission" and similar terms may particularly relate to light having a wavelength in the range of about 620-750 nm. In a specific embodiment, the red light may have a centroid wavelength in the range of 620-750 nm. The terms "cyan light" or "cyan emission" and similar terms may particularly relate to light having a wavelength in the range of about 490-520 nm. In a specific embodiment, the cyan light may have a centroid wavelength in the range of 490-520 nm. The terms "amber light" or "amber emission" and similar terms may particularly relate to light having a wavelength in the range of about 585-605 nm, for example about 590-600 nm. In a specific embodiment, the amber light may have a centroid wavelength in the range of 585-605 nm. The phrase "light having one or more wavelengths within a wavelength range" and similar phrases may specifically indicate that the indicated light (or radiation) has a spectral power distribution having at least one or more intensities at these one or more wavelengths within the indicated wavelength range. For example, a solid-state light source emitting blue will have a spectral power distribution having intensities at one or more wavelengths within the wavelength range of 440-495 nm.

[0033] Furthermore, the light generating system may comprise a unit. In use, a plurality of light generating systems may be applied, and / or a light generating system comprising a plurality of units may be applied. Thus, the unit may be configured such that it is a modular unit, and a plurality of them may be arranged in a grid. Such a unit may be open on one or more sides or may be closed on one or more sides, in particular open on one or more sides. However, from the viewer's side, the unit may have a substantially closed wall, which may be shaped such that it provides an open cavity, and it is also part of an open cavity. Thus, in an embodiment, the unit may be a modular unit.

[0034] Typically, the unit may have a portion protruding from a plane passing through a center point of the unit, which portion may conceal a closed cavity, and a portion recessed relative to such plane and which portion provides an open portion. The former portion may be convex, and the latter portion may be concave.

[0035] Thus, in an embodiment, in a cross-sectional view, the unit may comprise an open hollow portion and a closed hollow portion. Furthermore, the unit may comprise a viewer side. In particular, the unit may have a viewer side and a back side. Assuming an application in a ceiling for example, the viewer side may point towards the floor and the back side may point towards the ceiling. Assuming an application on a wall, the viewer side may be away from the wall and the back side may point towards the wall. Assuming an application in a (free) standing unit, the back side may be closed, such that the rest of the unit may be visible from this side and (system) light may essentially only escape from the viewer side. Thus, in an embodiment, the open hollow portion is concave relative to the viewer side.

[0036] In a particular embodiment, the open hollow portion may include a first wall portion. In a particular embodiment, in a cross-sectional view, the open hollow portion may be substantially defined by the first wall portion.

[0037] In a further specific embodiment, the first wall portion may be diffusely reflective for the first device light. In this way, light reaching the open hollow portion may be diffusely reflected by the first wall portion. As described above, the open hollow portion may in particular be at least partially defined by the first wall portion.

[0038] The enclosed hollow portion which is substantially closed in a cross-sectional view may define a chamber, ie the hollow portion. The chamber may be defined by chamber walls.

[0039] The room wall may include a second wall portion, in particular a second wall portion arranged on the viewer side, which in an embodiment may serve as a wall element together with the first wall portion (see also below). The second wall portion may allow some light in the room to be transmitted to the outside via the second wall portion, or vice versa. Therefore, in an embodiment, the closed hollow portion may include a room wall, which includes (a) a second wall portion. In particular, the second wall portion may be translucent for the first device light. With the translucent second wall portion, light can be transmitted, while a person on the viewer side may not be able to see the interior of the room.

[0040] The chamber wall may further comprise a chamber wall portion, in particular a chamber wall portion arranged on the back side, which chamber wall portion may be particularly configured not to transmit too much light available in the chamber. In this way, light in the chamber may essentially escape from the chamber only via the second wall portion and not via the chamber wall portion. Furthermore, in a specific embodiment, the chamber wall may comprise (b) a chamber wall portion. In particular, the chamber wall portion may be diffusely reflective for the first device light.

[0041] As can be derived from above, the unit may comprise a wall element comprising a first wall portion and a second wall portion. Assuming a cross section of the unit, the area of ​​the first wall portion and the second wall portion (on the viewer side) may be larger than the area of ​​the cross section (see also the embodiments below). In particular, the wall element (for the first device light) may be translucent.

[0042] The open hollow portion can be used to accommodate a light generating device. The light generating device can be configured to illuminate at least a portion of the first wall portion and a portion of the second wall portion. The light generating device can be particularly configured so that and the open hollow portion can be shaped so that the light generating device can be hidden in the open hollow portion. In this way, the device light can escape from the open hollow portion only via at least one reflection at the first wall portion and / or at least one reflection at the second wall portion. Therefore, in an embodiment, the unit and the first light generating device can be configured so that the first device light (substantially) does not escape directly from the viewer side. The light generating device configured in the hollow portion is indicated as a first light generating device in this article. As described above, the first light generating device can include one or more light generating devices. Assuming multiple first light generating devices, two or more can be the same and / or two or more can be different. Therefore, in an embodiment, the first light generating device can be configured in the open hollow portion, and in particular, the first light generating device can be configured to illuminate (i) at least a portion of the first wall portion and (ii) at least a portion of the second wall portion.

[0043] Because the second wall portion can be translucent, at least a portion of the first device light can enter the closed hollow portion. However, because the second wall portion can therefore be translucent, at least a portion of the first device light can also escape from the closed hollow portion again. In this respect, it can also be useful when the chamber wall portion is reflective. In this way, light that has entered the chamber can be reflected at the chamber portion and, for example, guided to the second wall portion, through which the light can escape from the chamber. Furthermore, in an embodiment, the closed hollow portion can be configured such that at least a portion of the first device light that enters the closed hollow portion via the second wall portion also escapes via the second wall portion.

[0044] In an embodiment, the wall element may have a wavy shape. In an embodiment, the wall element may have a sine-like shape. Thus, the wall element may include concave parts and convex parts. The wall element may consist of a plurality of curves, but the wall element may also include one or more facets. In an embodiment, the mutual angles between adjacent facets may be greater than 90°, such as selected from the range of 95-175°, such as for example 100-135°, although other values ​​may also be possible.

[0045] In a specific embodiment, the first wall portion can be curved, or can include more than three facets (such as at least four facets or at least five facets), or can include a curved portion and one or more facets. Alternatively or additionally, the second wall portion can be curved, or can include more than three facets, or can include a curved portion and one or more facets.

[0046] In an embodiment, at least 50%, such as at least 60%, such as in particular at least 70%, of the surface of the wall element may be defined by the first wall portion and the second wall portion.

[0047] In particular, in an embodiment, the first light generating device may be controllable. More particularly, the first device light may be controllable with respect to one or more of color point and radiant flux.

[0048] The color point may be controlled, for example, by using first light generating devices having different spectral power distributions for their first light, such as, for example, first light generating devices of different sectors. Alternatively or additionally, the color point may also be adjustable when using light generating devices with adjustable spectral power distributions, such as VCSELs or superluminescent dyes. Other options for controlling the spectral power distribution of the first device light may also be possible.

[0049] The radiant flux may be controlled by controlling the power to the light generating device.In an embodiment, the radiant flux may be controlled via pulse width modulation.Other options for controlling the radiant flux of the first device light may also be possible.

[0050] In an embodiment, the light generating system may further comprise a control system configured to control the first light generating device.

[0051] The term "control" and similar terms refer in particular at least to determining the operation of a behavior or a supervisory element. Therefore, in this article, "control" and similar terms may, for example, refer to applying behavior (determining the operation of a behavior or a supervisory element) to an element, such as, for example, measuring, displaying, actuating, opening, moving, changing temperature, etc. In addition, the term "control" and similar terms may additionally include monitoring. Therefore, the term "control" and similar terms may include applying behavior to an element, and also applying behavior to an element and monitoring the element. The control of the element may be completed with a control system, which may also be indicated as a "controller". Therefore, the control system and the element may be functionally coupled at least temporarily or permanently. The element may include a control system. In an embodiment, the control system and the element may not be physically coupled. Control may be completed via wired and / or wireless control. The term "control system" may also refer to a plurality of different control systems, which are particularly functionally coupled, and wherein, for example, one control system may be a master control system, and one or more other control systems may be slave control systems. The control system may include or may be functionally coupled to a user interface.

[0052] The control system may also be configured to receive and execute instructions from a remote control. In an embodiment, the control system may be controlled via an App on a device such as a portable device (e.g., a smartphone or iPhone, a tablet, etc.). Thus, the device is not necessarily coupled to the lighting system, but may be (temporarily) functionally coupled to the lighting system.

[0053] Thus, in an embodiment, the control system may (also) be configured to be controlled by an App on a remote device. In such an embodiment, the control system of the lighting system may be a slave control system or a control in slave mode. For example, the lighting system may be identified with a code, in particular a unique code for the respective lighting system. The control system of the lighting system may be configured to be controlled by an external control system, which accesses the lighting system based on the knowledge of the (unique) code (input via a user interface or input using an optical sensor (e.g. a QR code reader)). The lighting system may also include components for communicating with other systems or devices, such as based on Bluetooth, Thread, WIFI, LiFi, ZigBee, BLE or WiMAX, or other wireless technologies.

[0054] The system or device or equipment may perform actions in a "mode" or "operating mode" or "operable mode". The term "operable mode" may also be indicated as a "control mode". Similarly, in a method, an action or phase or step may be performed in a "mode" or "operating mode" or "operable mode". This does not exclude that the system, or device, or equipment may also be adapted to provide another control mode, or multiple other control modes. Similarly, this may not exclude that one or more other modes may be performed before and / or after the execution of the mode.

[0055] However, in an embodiment, a control system may be available, which is adapted to provide at least a control mode. If other modes are available, the selection of such a mode may in particular be performed via a user interface, although other options (such as executing a mode depending on a sensor signal or a (time) scheme) may also be possible. In an embodiment, an operating mode may also refer to a system, or a device, or an apparatus that can only operate in a single operating mode (i.e. "on", without further tunability).

[0056] Thus, in an embodiment, the control system may be controlled depending on one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer.The term "timer" may refer to a clock and / or a predetermined time scheme.

[0057] The first device light generated in the cavity can be reflected in particular by the first wall portion. Therefore, the first wall portion is reflective for the first device light. In an embodiment, assuming vertical illumination with the first device light, the first wall portion can be configured to reflect at least 25% of the first device light. In a specific embodiment, assuming vertical illumination with the first device light, the first wall portion can be configured to reflect at least 35% of the first device light. However, in an embodiment, assuming vertical illumination with the first device light, the first wall portion can be configured to reflect at least 45% of the first device light, such as at least 55%, such as more particularly at least 65%, even more particularly at least 75%, such as at least about 80% or higher, such as at least 90%. If the first wall portion is translucent, a (specular) reflector can be configured downstream of the first wall portion for higher reflection.

[0058] The terms "upstream" and "downstream" relate to the arrangement of items or features relative to the propagation of light from a light generating device (here in particular a light source), wherein, relative to a first position in a light beam from the light generating device, a second position in the light beam closer to the light generating device is "upstream" and a third position in the light beam further away from the light generating device is "downstream".

[0059] In an embodiment, assuming vertical illumination with the first device light, the second wall portion can be configured to transmit at least 25%, more particularly at least about 35%, such as at least about 45% of the first device light forward. In a specific embodiment, assuming vertical illumination with the first device light, the second wall portion can be configured to transmit at least 55% of the first device light forward. More specifically, in an embodiment, assuming vertical illumination with the first device light, the second wall portion can be configured to transmit 60-95% of the first device light forward.

[0060] The chamber wall portion may also be reflective for the first device light. The chamber wall portion may be reflective for the first device light. In an embodiment, assuming vertical illumination with the first device light, the chamber wall portion may be configured to reflect at least 25% of the first device light. In a specific embodiment, assuming vertical illumination with the first device light, the chamber wall portion may be configured to reflect at least 35% of the first device light. However, in an embodiment, assuming vertical illumination with the first device light, the chamber wall portion may be configured to reflect at least 45% of the first device light, such as at least 55%, such as more particularly at least 65%, even more particularly at least 75%, such as at least about 80% or higher, such as at least about 90%. If the chamber wall portion is translucent, a (mirror) reflector may be configured downstream of the chamber wall portion for higher reflection. In a specific embodiment, assuming vertical illumination with the first device light, the chamber wall portion may be configured to reflect at least 90% of the first device light, such as at least about 95%.

[0061] With such a system, after the first device light has first entered the closed hollow portion, a portion of the first device light can escape from the open hollow portion, and a portion of the first device light can escape from the closed hollow portion. In this way, the light emitting wall element. Thus, from the viewer side, the unit can provide light from a considerable portion of the wall element. The contrast ratio may be relatively low.

[0062] The contrast can be further controlled by including a second light generating device configured to provide a second device light in the enclosed hollow portion. Alternatively or additionally, the second light generating device can also be used for other purposes, such as providing another color of light, or even enhancing the contrast.

[0063] In embodiments, the color point and the radiant flux of the light emitted from the cells of the first and second wall portions, when in operation, may be the same, but may also be different in other embodiments.

[0064] Therefore, in a particular embodiment, the light generating system may further include a second light generating device configured to provide a second device light in the closed hollow portion.

[0065] As described above, the light generating system may include a second light generating device. The term "second light generating device" may also refer to a plurality of substantially identical second light generating devices, such as a plurality of identical light generating devices (such as from the same partition), or a plurality of light generating devices having substantially the same function. In this document, in an embodiment, the second light generating device may be configured to provide a second device light having a wavelength in the visible wavelength range. However, there may also be a plurality of second light generating devices, one or more of which (i) are configured to generate visible light, and one or more of which (ii) are configured to generate IR radiation and / or one or more are configured to generate UV radiation. In particular, in an embodiment, the second light generating device may be controllable. More particularly, the second device light may be controllable with respect to one or more of the color point and the radiant flux. The color point may be controlled, for example, by using second light generating devices having different spectral power distributions for their second light (such as, for example, second light generating devices of different partitions). Alternatively or additionally, when a light generating device having an adjustable spectral power distribution (such as a VCSEL or a superluminescent dye) is used, the color point may also be adjustable. Other options for controlling the spectral power distribution of the second device light may also be possible. The radiant flux may be controlled by controlling the power to the light generating device. In an embodiment, the radiant flux may be controlled via pulse width modulation. Other options for controlling the radiant flux of the second device light may also be possible. In an embodiment, the control system may be configured to control the second light generating device.

[0066] In particular, in an embodiment, the second device light has a wavelength in the visible wavelength range. However, in further embodiments, wherein the system comprises a plurality of second light generating devices, at least one of the second light generating devices is configured to generate second device light having a wavelength in the visible wavelength range.

[0067] The second light generating device may be arranged upstream of the chamber wall portion. In such an embodiment, the chamber wall portion is at least transmissive for the second device light. Alternatively or additionally, the second light generating device may be arranged within the closed hollow portion. In such an embodiment, the chamber wall portion is at least reflective for the second device light. Thus, in an embodiment, the second light generating device may be arranged within the closed hollow portion. Thus, in a specific embodiment, no second device light can escape from the system except via the second wall portion.

[0068] In order to allow the second device light to escape from the enclosed hollow portion, the second wall portion may (also) be transmissive for the second device light. Furthermore, in order to facilitate the escape of the second device light from the enclosed hollow portion, the chamber wall portion may be reflective, in particular diffusely reflective. Thus, in an embodiment, the chamber wall portion may be diffusely reflective for the second device light. Thus, in an embodiment, the chamber wall portion may be (i) substantially non-transmissive for the second device light, and (ii) reflective for the second device light, in particular when the second light generating device is configured in the enclosed hollow portion. In other embodiments, the chamber wall portion may be (i) transmissive for the second device light, and (ii) reflective for the second device light, in particular when the second light generating device is configured on the back side of the chamber wall portion (and therefore outside the enclosed hollow portion).

[0069] In particular, the second wall portion may be translucent for the second device light. As described above, the second wall portion may also be translucent for the first device light. In a specific embodiment, the second wall portion may be translucent for white light. However, in other specific embodiments, the entire wall element may be translucent for white light.

[0070] In a specific embodiment, the unit and the second light generating device may be configured such that for a human user, the second light generating device in the closed state may not be visible with the human eye from the viewer side (assuming that the second light generating device is configured in a closed hollow portion). Therefore, in an embodiment, the translucency may be selected such that the second device light (and the first device light) may be transmitted through the second wall portion, while the forward transmission is low enough to substantially hide the second light generating device.

[0071] In an embodiment, assuming vertical illumination with the second device light, the second wall portion may be configured to transmit 60-95%, such as 65-90%, such as selected from the range of 70-90% of the second device light forwards.

[0072] Similarly, as can also be derived from the above, assuming vertical illumination with the first device light (the first device light entering the enclosed hollow portion or the first device light escaping (again) from the enclosed hollow portion), the second wall portion can be configured to transmit 60-95% of the first device light forward, such as 65-90%, such as selected from the range of 70-90%.

[0073] As described above, in an embodiment, the chamber wall portion may be (i) substantially non-transmissive to the second device light, and (ii) reflective to the second device light, in particular when the second light generating device is configured in a closed hollow portion. In an embodiment, assuming vertical illumination with the second device light, the chamber wall portion may be configured to reflect at least 25% of the second device light. In a specific embodiment, assuming vertical illumination with the second device light, the chamber wall portion may be configured to reflect at least 35% of the second device light. However, in an embodiment, assuming vertical illumination with the second device light, the chamber wall portion may be configured to reflect at least 45% of the second device light, such as at least 55%, such as more particularly at least 65%, even more particularly at least 75%, such as at least about 80% or more. If the chamber wall portion is translucent, a (mirror) reflector may be configured downstream of the chamber wall portion for higher reflection. In a specific embodiment, assuming vertical illumination with the second device light, the chamber wall portion may be configured to reflect at least 90% of the second device light, such as at least about 95%.

[0074] In a specific embodiment, the second light generating device may be controllable. More specifically, the second device light may be controllable with respect to one or more of a color point and a radiant flux. Thus, in an embodiment, the control system may be configured to control the second light generating device. In a specific embodiment, the control system may be configured to control the first light generating device and the second light generating device separately.

[0075] In an embodiment, when more than one cavity is present in each of the first light generating devices, these cavities may be controlled individually. In an embodiment, when more than one cavity is present in each of the second light generating devices, these cavities may be controlled individually.

[0076] The color point can be controlled, for example, by using second light generating devices having different spectral power distributions for their second light, such as, for example, differently partitioned second light generating devices. Alternatively or additionally, the color point may also be adjustable when using light generating devices with adjustable spectral power distributions, such as VCSELs or superluminescent dyes. Other options for controlling the spectral power distribution of the second device light may also be possible.

[0077] The radiant flux may be controlled by controlling the power to the light generating device.In an embodiment, the radiant flux may be controlled via pulse width modulation.Other options for controlling the radiant flux of the second device light may also be possible.

[0078] It is evident that with the first and second light generating devices a scalable unit can be provided which can provide a light emitting surface at which the contrast can be significantly reduced. The radiant flux and the color point of the first device light and the second device light can be selected such that a substantially continuous and evenly distributed light emitting surface is obtained, i.e. the light from the wall element. Thus, such a low contrast can be obtained when controlling one or more of the first light generating device and the second light generating device. However, when desired, an enhanced contrast may also be possible. Furthermore, all kinds of lighting schemes can be selected when the correlated color temperature and / or the color point are variable.

[0079] In an embodiment, in an operating mode of the system, the color points of the first device light and the second device light may be substantially the same, such as both are white light (or both are colored light). The color or color point of the first type of light and the second type of light may be substantially the same when the respective color points of the first type of light and the second type of light differ by a maximum of 0.03 for u' and / or a maximum of 0.03 for v', or even more particularly by a maximum of 0.02 for u' and / or a maximum of 0.02 for v'. In a more specific embodiment, the respective color points of the first type of light and the second type of light differ by a maximum of 0.01 for u' and / or a maximum of 0.01 for v'. Here, u' and v' are the color coordinates of the light in the CIE 1976 UCS (Uniform Chromaticity Scale) diagram. Therefore, in a specific embodiment, the light generating system may be configured to provide the first device light and the second device light in an operating mode of the light generating system, the first device light and the second device light having color points that differ by a maximum of 0.03 for u' and / or a maximum of 0.03 for v'.

[0080] In a specific embodiment, the first light generating device may be configured to generate (in an operating mode of the first light generating device) white first device light having a controllable first correlated color temperature. Alternatively or additionally, in a specific embodiment, the second light generating device may be configured to generate (in an operating mode of the second light generating device) white second device light having a controllable second correlated color temperature.

[0081] The term "white light" and similar terms are known to the person skilled in the art in this document. It may particularly relate to light having a correlated color temperature (CCT) between about 1800K and 20000K, such as between 2000 and 20000K, in particular 2700-20000K, for general lighting, in particular in the range of about 2000-7000K, such as in the range of 2700K and 6500K. In an embodiment, for example for the purpose of backlighting, or for other purposes, the correlated color temperature (CCT) may in particular be in the range of about 7000K and 20000K. Still further, in an embodiment, the correlated color temperature (CCT) is in particular within about 15SDCM (standard deviation of color matching) from the BBL (black body locus), in particular within about 10SDCM from the BBL, even more in particular within about 5SDCM from the BBL.

[0082] In a specific embodiment, the correlated color temperature (CCT) may be selected from the range of 6000-12000 K, such as from the range of 7000-12000 K, such as at least 8000 K. Still further, in an embodiment, the correlated color temperature (CCT) may be selected from the range of 6000-12000 K, such as from the range of 7000-12000 K, in combination with a CRI of at least 70.

[0083] In one embodiment, the light source may also provide a light source light with a correlated color temperature (CCT) between about 5000 and 20000 K, such as a direct phosphor converted LED (a blue light emitting diode with a thin phosphor layer, for example to obtain 10000 K). Thus, in a specific embodiment, the light source is configured to provide a light source light with a correlated color temperature in the range of 5000-20000 K, even more particularly in the range of 6000-20000 K, such as 8000-20000 K. An advantage of a relatively high color temperature may be that a relatively high blue component may be present in the light source light.

[0084] In a specific embodiment, the first light generating device may be configured to generate (in an operating mode of the first light generating device) a colored first device light having a controllable first color point. Alternatively or additionally, in a specific embodiment, the second light generating device may be configured to generate (in an operating mode of the second light generating device) a colored second device light having a controllable second color point.

[0085] The contrast ratio can be generated by the difference in brightness between two adjacent surfaces. The contrast ratio can be determined, for example, according to the Weber definition, i.e., CS = (L max -L min ) / L maxIn an embodiment, during operation of the light generating system in the operating mode, the first wall portion and the second wall portion may have a contrast ratio of less than 10%, as defined by (L max -L min ) / L max determined. However, a contrast ratio of 5% or less, or even 1% or less may also be possible. When comparing contrast ratios, in particular the light causing the brightness may have substantially the same color point, such as the same correlated color temperature in a specific embodiment. Therefore, when the first device light and the second device light are controlled at substantially the same color point, a contrast ratio of 10% or less, such as 5% or less, or even 1% or less, may be achieved using the present invention. For example, the first device light and the second device light may differ by a maximum of 0.03 for u' and / or by a maximum of 0.03 for v'. Note, however, that for some applications (e.g., some lighting schemes), a low contrast ratio may be desired, while for other applications (e.g., other lighting schemes), a higher contrast ratio may be desired. Therefore, in particular the radiant flux of the first device light and the second device light may be controllable. Furthermore, in an embodiment, the color point of the first device light and the second device light may be controllable.

[0086] Above, the invention has been described with respect to a unit comprising closed hollow parts and open hollow parts. In an embodiment, approximately, the wall element on the viewer side may be defined by about 20-60% open hollow parts and about 30-70% closed hollow parts.

[0087] However, other configurations may also be possible. In particular, in an embodiment, the unit may include two open hollow parts, with a single hollow part configured between them. In other embodiments, the unit may include a configuration similar to A(BA)n or B(AB)n, wherein A represents an open hollow part, and B represents a closed hollow part, and n represents a repetition number, which is at least 1, such as selected from the range of 1-100. However, other values ​​are not excluded herein. In particular, A(BA)n with n=1 is further described in more detail herein.

[0088] In an embodiment, when there are two or more open hollow portions, the dimensions may be different. In an embodiment, when there are two or more open hollow portions, the dimensions may be the same.

[0089] In an embodiment, when there are two or more enclosed hollow portions, the dimensions may be different. In an embodiment, when there are two or more enclosed hollow portions, the dimensions may be the same.

[0090] In embodiments, when there are two or more open hollow portions, the first light generating devices may be different or may be the same.

[0091] In embodiments, when there are two or more closed hollow portions, the second light generating devices may be different or may be identical.

[0092] In a particular embodiment, the unit may comprise two open hollow parts in a cross-sectional view, both of which share a wall element with the closed hollow part. As described above, the unit may comprise a viewer side. The open hollow parts are concave relative to the viewer side and are configured so that the closed hollow part is between them. In particular, this may be a symmetrical configuration. Furthermore, the (one or more) first light generating devices in one of the open hollow parts may be substantially identical to the (one or more) first light generating devices in the other of the open hollow parts.

[0093] In an embodiment, in operation, the color point and the radiant flux of the light emitted from the unit from the first wall portion and from the second wall portion may be the same; however, in other embodiments, they may also be different. Thus, when the unit comprises one second wall portion and two first wall portions, the color point and the radiant flux of the light emitted from the unit from the first wall portion and from the second wall portion may be the same; however, in other embodiments, at least two may differ from each other in one or more of the radiant flux and the color point of the light emitted from the unit.

[0094] In an embodiment, the two (or more) open hollow portions may be operated differently than the closed hollow portion, for example to mimic the illusion of directional light. In addition, in an embodiment, the two (or more) open hollow portions may be operated separately.

[0095] The wall elements may be optimized by the shape and profile of the wall elements and their surface appearance to the human eye in terms of look and feel. Thus, the surface structure and roughness may be optimized. For example, when the surface of the first wall portion is smooth and highly diffuse, the illusion of an infinite feel may be created. When the surface is rougher and textured, the illusion of a continuous space behind the front layer may be created. When the surface of the first wall portion has a rough texture, the feeling of a finishing layer that feels natural and familiar may be created. In an embodiment, the wall element may include an amorphous surface finish. In an alternative embodiment, the wall element may include slight roughness, such as micron to sub-millimeter sized textures / particles and surface undulations. In yet another alternative embodiment, the wall element may include sub-millimeter to millimeter sized textures / particles and surface undulations.

[0096] In an embodiment, the system may comprise two first light generating devices, which are arranged in respective open hollow parts, wherein the two first light generating devices are individually controllable. In this way, the contrast can be even better controlled. Alternatively, a time-dependent light scheme can be (better) displayed.

[0097] The light generating system may be part of or may be applied in, for example, an office lighting system, a home application system, a store lighting system, a family lighting system, an accent lighting system, a spotlight lighting system, a theater lighting system, a fiber optic application system, a projection system, a self-luminous display system, a pixelated display system, a segmented display system, a warning sign system, a medical lighting application system, an indicator sign system, a decorative lighting system, a portable system, an automotive application, a (outdoor) road lighting system, a city lighting system, a greenhouse lighting system, horticultural lighting, digital projection, or an LCD backlight. The light generating system (or illuminator) may be part of or may be applied in, for example, an optical communication system or a disinfection system.

[0098] In an embodiment, the unit may be comprised in a ceiling or functionally coupled to a ceiling. In an embodiment, the unit may be comprised in a wall or functionally coupled to a wall. In an embodiment, the unit may be comprised in a room divider or functionally coupled to a room divider. In particular, the functional coupling here may at least comprise an attachment or a mechanical connection.

[0099] In yet another aspect, the present invention also provides a lamp or illuminator comprising a light generating system as defined herein. The illuminator may further include a housing, an optical element, a shutter, etc. The lamp or illuminator may further include a housing enclosing the light generating system. The lamp or illuminator may include a light window or housing opening in the housing, through which the system light escapes from the housing. In yet another aspect, the present invention also provides a projection device comprising a light generating system as defined herein. In particular, a projection device or "projector" or "image projector" may be an optical device that projects an image (or moving image) onto a surface (such as, for example, a projection screen). The projection device may include one or more light generating systems, such as described herein. Therefore, in one aspect, the present invention also provides a light generating device selected from a group of lamps, illuminators, projector devices, disinfection equipment, photochemical reactors, and optical wireless communication devices, including a light generating system as defined herein. The light generating device may include a housing or carrier configured to accommodate or support one or more elements of the light generating system. For example, in an embodiment, the light generating device may comprise a housing or a carrier configured to accommodate or support one or more of the first light generating device, the wall element and the optional second light generating device.

[0100] In yet a further aspect, the present invention provides a space comprising walls and a ceiling, wherein one or more of the walls and the ceiling may comprise an arrangement of a plurality of units as described herein.

[0101] The term "space" may, for example, relate to (a part of) a reception area, such as a restaurant, a hotel, a clinic or a hospital, etc. The term "space" may also relate to (a 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 (a part of) a workspace in a vehicle, such as a cab of a truck, a cab of an airplane, a cab of a ship (ship), a cab of a car, a cab of a crane, a cab of an engineering vehicle (such as a tractor), a cab of a train carriage, etc. The term "space" may also relate to (a part of) a workspace, such as an office, a (production) factory, a power plant (such as a nuclear power plant, a gas power plant, a coal power plant, etc.), etc. For example, the term "space" may also relate to a control room, a security room, etc. In particular, the term "space" may refer to an indoor space herein. In yet other embodiments, the term "space" may also relate to a toilet or a bathroom. In yet other embodiments, the term "space" may also relate to an elevator. In an embodiment, the term "space" may also refer to a conference room, a classroom, an indoor corridor, an indoor aisle, an indoor space in a nursing home, an indoor space in a sanatorium, etc. In an embodiment, the term "space" may refer to an indoor sports space, such as a gymnasium, a gymnastics hall, an indoor ball game space, a ballet studio, a swimming pool, a locker room, etc. In an embodiment, the term "space" may refer to an (indoor) bar, an (indoor) discotheque, etc. In a specific embodiment, a space may be created by a floor and a plurality of units forming one or more walls and a ceiling.

[0102] With the present invention, visual effects can be produced with relatively thin units, such as a maximum of 20 cm, although a maximum of 10 cm can also be achieved, such as in the range of 5-10 cm. This allows considerable shrinkage and allows various applications in relatively narrow spaces. However, the unit can also be enlarged, thereby allowing various applications in relatively large spaces.

[0103] According to a first aspect, the invention provides a method for manufacturing a light generating system according to claim 13 . BRIEF DESCRIPTION OF THE DRAWINGS

[0104] Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings, in which corresponding reference numerals indicate corresponding parts, and in which:

[0105] Figures 1a-1b schematically depict three embodiments, although other embodiments may be possible within the scope of the claims; and

[0106] Figure 2 Some possible applications are schematically depicted.

[0107] The schematic drawings are not necessarily to scale. DETAILED DESCRIPTION

[0108] Among other things, in the present invention, it is proposed to improve the optical efficiency of the optical cavity by closing the bottom part of the indirectly illuminated cavity. Furthermore, among other things, it is proposed herein to improve the contrast sensitivity of the system by implementing the opaque, reflective convex part of the shaped element, in particular the S-shaped element, as a translucent convex optical cavity, which can be at least passively illuminated by stray light emerging from the indirectly illuminated cavity. Furthermore, among other things, it is proposed herein that the translucent convex cavity can be illuminated from the inside, for example by direct illumination of a translucent light exit window, so that the contrast sensitivity of the convex part and the concave part can be controlled independently of each other and that it can be adjusted at will in a range that cannot be obtained by conventional means in a specific embodiment. In particular, in an embodiment, due to the independent control of the two optical cavities, both enlargement and / or reduction are possible without a considerable burden of unacceptable contrast modulation, thereby meeting the required / needed space limitations behind the ceiling and serving the contrast sensitivity needs of various age groups.

[0109] In an embodiment, the system may include a curved diffuse reflective element, wherein the shape of its outer contour is similar to the shape of a leaf with a curled stem portion (see embodiments I and II of FIG. 1a), but is not limited to such a shape. The system may include an S-shaped diffuse translucent element. In particular, the element may be aligned toward the curved diffuse reflective element to form a softly curved light exit window, wherein the light exit window seamlessly integrates a concave optical cavity and a convex optical cavity. In an embodiment, at least a first light engine (i.e., a first light generating device) preferably indirectly illuminates the concave portion (i.e., the stem portion) of the S-shaped component, so that the translucent convex optical cavity is passively illuminated, thereby improving the contrast sensitivity. In addition, in a specific embodiment, at least a second light engine (i.e., a second light generating device) may illuminate the translucent cavity from the inside. In a specific embodiment, such a second light engine may be controlled independently of the first light engine, so that the contrast sensitivity of the curved light exit window may be dynamically controlled and may be adjusted at will. This may further facilitate the enlargement and reduction of the unit size. The system may further include a lighting controller, which in particular controls the first light engine and the second light engine. For example, a device that is more acceptable than a tablet device mounted to a wall to introduce melanin light levels into the human eye. For example, in a specific embodiment, only a portion of the viewer surface can serve the melanin proposal. For example, the bottom portion of the device surface for wall placement can simulate the surface conditions of the earth's surface, and the upper portion can simulate the surface conditions of the horizon and / or sky portion, where the sky portion provides melanin-enhancing light (i.e., reduces melatonin production).

[0110] FIG. 1 a schematically depicts a light generating system 1000 comprising a first light generating device 110 and a unit 1100. The first light generating device 110 may be configured to provide a first device light 111 having a wavelength in the visible wavelength range. In particular, the unit 1100 may include an open hollow portion 400 and a closed hollow portion 500 in a cross-sectional view. Furthermore, the unit 1100 may include a viewer side 1101. In particular, the open hollow portion 400 may be concave relative to the viewer side 1101. The open hollow portion 400 may include a first wall portion 451. The first wall portion 451 may be diffusely reflective for the first device light 111. The closed hollow portion 500 may include a chamber wall 501, which includes: (a) a second wall portion 452, which may be translucent for the first device light 111; and (b) a chamber wall portion 453, which may be diffusely reflective for the first device light 111. The unit 1100 may include a wall element 450, which includes a first wall portion 451 and a second wall portion 452. In particular, the first light generating device 110 may be arranged in the open hollow portion 400. In an embodiment, the first light generating device 110 may be configured to illuminate (i) at least a portion of the first wall portion 451 and (ii) at least a portion of the second wall portion 452. Furthermore, the unit 1100 and the first light generating device 110 may be configured such that the first device light 111 does not (substantially) escape directly from the viewer side 1101. The closed hollow portion 500 may be configured such that at least a portion of the first device light 111 entering the closed hollow portion 500 via the second wall portion 452 also escapes via the second wall portion 452.

[0111] The first light generating device or one or more of the first light generating devices may comprise an LED. In addition to discrete LEDs, filament LEDs, linear COBs covered with phosphor lines, or different alternating phosphor parts may also be used as solid-state lighting (SSL) sources. Other SSLs, such as (flexible) light from OLEDs may also be used. Side-coupled linear light guides (light rods) may also be used as light sources. The same applies to small diameter gas discharge tubes. Optionally, the first light generating device or the second light generating device may also comprise a light source, which is configured to generate radiation other than visible light. In particular, the cavity for indirect illumination of the first light may be suitable for the integration of UV-B LEDs (vitamin D), or generally for wavelengths that are difficult to adequately pass through materials of conventional light exit windows.

[0112] As can be gathered from the figures, in an embodiment, the wall element 450 may have a wavy shape. In an embodiment, the first wall portion 451 may be curved, or may include more than three facets, or may include a curved portion and one or more facets. Here, the curved wall element 450 is only schematically depicted. Furthermore, the second wall portion 452 may be curved, or may include more than three facets, or may include a curved portion and one or more facets. The surface may be smooth or rough / textured to serve different use cases, see also above.

[0113] In an embodiment, the first light generating device 110 may be controllable. In particular, the first device light 111 may be controllable with respect to one or more of color point and radiant flux. However, in an embodiment, the light generating system 1000 may further include a control system 300 configured to control the first light generating device 110.

[0114] In particular, assuming vertical illumination with first device light 111, first wall portion 451 can be configured to reflect at least 35% of first device light 111, more particularly at least 75%, such as at least about 80%, such as at least about 90% of first device light 111.

[0115] In an embodiment, the second wall portion 452 and the first wall portion 451 may have substantially the same optical properties. In such an embodiment, it may be useful to have a highly reflective element downstream of at least a portion of the first wall portion. Therefore, a reflector, such as a reflective layer, may be configured downstream of at least a portion of the first wall portion. Assuming vertical illumination with the first device light 111, the reflector configured downstream may be configured to reflect at least 80%, more particularly at least 85%, and even more particularly at least about 90% of the first device light 111. Alternatively or additionally, assuming vertical illumination with the second device light 121, the reflector configured downstream may be configured to reflect at least 80%, more particularly at least 85%, and even more particularly at least about 90% of the second device light 121.

[0116] In an embodiment, assuming vertical illumination with first device light 111, second wall portion 452 may be configured to transmit 60-95% of first device light 111 forward.

[0117] However, in an embodiment, assuming vertical illumination with the first device light 111, the chamber wall portion 453 can be configured to reflect at least 35% of the first device light 111, more particularly at least 75%, such as at least about 80%, such as at least about 90% of the first device light 111.

[0118] In an embodiment, the second wall portion 452 and the chamber wall portion 453 may have substantially the same optical properties. In such an embodiment, it may be useful to have a highly reflective element downstream of the chamber wall portion. Therefore, downstream of the chamber wall portion, a reflector, such as a reflective layer, may be configured. Assuming vertical illumination with the first device light 111, the reflector configured downstream may be configured to reflect at least 80%, more particularly at least 85%, and even more particularly at least about 90% of the first device light 111. Alternatively or additionally, assuming vertical illumination with the second device light 121, the reflector configured downstream may be configured to reflect at least 80%, more particularly at least 85%, and even more particularly at least about 90% of the second device light 121.

[0119] As schematically depicted, in an embodiment, the light generating system 1000 may further include a second light generating device 120 configured to provide a second device light 121 in the closed hollow portion 500. The second device light 121 may have a wavelength in the visible wavelength range.

[0120] In particular, the second wall portion 452 may be translucent for the second device light 121. In an embodiment, the unit 1100 and the second light generating device 120 may be configured such that the second light generating device 120 in the closed state may be invisible to the human eye from the viewer side 1101 for a human user. In an embodiment, the second light generating device 120 may be configured within the closed hollow portion 500. In addition, in an embodiment, the chamber wall portion 453 may be diffusely reflective for the second device light 121. In particular, in an embodiment, assuming vertical illumination with the second device light 121, the second wall portion 452 may be configured to transmit 60-95% of the second device light 121 forward. However, in an embodiment, assuming vertical illumination with the second device light 121, the chamber wall portion 453 may be configured to reflect at least 35% of the second device light 121, more particularly at least 75%, such as at least about 80%, such as at least about 90% of the second device light 121. In an embodiment, the second light generating device 120 may be controllable. In particular, the second device light 121 may be controllable with respect to one or more of color point and radiant flux. The control system 300 may be configured to control the second light generating device 120 .

[0121] In a specific embodiment, the light generating system 1000 may be configured to provide a first device light 111 and a second device light 121 in an operating mode of the light generating system 1000, the first device light 111 and the second device light 121 having color points that differ by a maximum of 0.03 for u' and / or by a maximum of 0.03 for v'. The first light generating device 110 may be configured to generate a white first device light 111 having a controllable first correlated color temperature. Furthermore, in an embodiment, the second light generating device 120 may be configured to generate a white second device light 121 having a controllable second correlated color temperature.

[0122] In an embodiment, during operation of the light generating system 1000 in the operating mode, the first wall portion 451 and the second wall portion 452 have a contrast ratio of less than 10%, as defined by (L max -L min ) / L max Determined.

[0123] Referring to embodiment III of FIG. 1a , among others, the unit 1100 may include two open hollow portions 400 in a cross-sectional view, both of which share a wall element 450 with a closed hollow portion 500. The unit 1100 may include a viewer side 1101. With respect to the viewer side 1101, in an embodiment, the open hollow portions 400 are concave and are configured to have the closed hollow portion 500 therebetween. The closed hollow portion may be convex.

[0124] 1a, reference numeral P indicates a cross-sectional plane. Assuming such a cross-sectional plane P of the unit 1100, the areas of the first wall portion 451 and the second wall portion 452 (on the viewer side) may be larger than the area of ​​the cross-sectional plane.

[0125] In an embodiment, the unit 1100 may be enclosed by a virtual minimum cuboid (i.e., a virtual cuboid having the minimum volume that encloses the unit 1100). The faces perpendicular to the cuboid define a major axis and a minor axis, with the longest dimension having a longest dimension length (L1), the minor axis having a minor axis length (L2), and another or additional (orthogonal axis) having an additional axis length (L3). Thus, the longest dimension may particularly relate to the length of the unit 1100, the minor axis may particularly relate to the thickness or height of the unit 1100, and the additional axis may particularly relate to the width of the unit 1100.

[0126] In particular L1>L2, and furthermore in particular L3>L2. The ratios L1 / L2 given herein may also apply to the ratios L3 / L2. L1 and L3 may be identical or may be different, but in a specific embodiment are each independently, in particular at least 2 times larger than L2, such as at least 5 times larger than L2. In addition, the dimensions of the longest dimension length given herein therefore also apply to the lengths of the other axes, although as mentioned above, the lengths of these axes may be selected individually. With the definition of a virtual cuboid and the dimensions indicated herein, substantially flat particles, such as flakes, are defined.

[0127] In an embodiment, the cumulative area of ​​the first wall portion 451 and the second wall portion 452 is greater than L1*L3, such as at least 1.2*L1*L3.

[0128] To describe Figure 1b, reference is first made to Figure 1a. For example, embodiments I and II can be rotated about an axis. In embodiment I of Figure 1b, a top view or bottom view of such an embodiment is schematically depicted. This is essentially the same as embodiment III of Figure 1a being rotated about a central axis. Referring to embodiment II of Figure 1b, a second closed hollow space and a second open hollow space are added. Again, this is shown very schematically. Embodiment III schematically shows a cross-sectional view of a pillar comprising one or more units.

[0129] refer to Figure 2 , the unit 1100 may be a modular unit 1100. Reference numeral 1300 refers to a space, such as a room. Reference numeral 1305 refers to a floor; reference numeral 1307 refers to a wall, and reference numeral 1310 refers to a ceiling. Thus, the space 1300 includes walls 1307 and a ceiling 1310. One or more of the walls 1307 and the ceiling 1310 may include an arrangement of a plurality of units 1100 according to any of the preceding claims 1-13. Reference numeral 301 refers to a user interface. The user interface 301 may be functionally coupled to the control system 300.

[0130] In an embodiment, one or more walls may be provided by the unit 1100. In an embodiment, substantially the entire ceiling may be provided with one or more units 1100.

[0131] Some further embodiments are described with reference to embodiment III of Figure 1a. The shape of the optical cavity can be alternating concave and convex. When the cavity is implemented symmetrically, a time element can be provided, because for example, as time passes, light starts to be emitted from the left cavity in the morning, moves to the center cavity at noon, illuminates all three cavities at noon, and finally moves to the right cavity to be emitted substantially from the right cavity in late afternoon, early evening.

[0132] The structures of the cavities can also be wound around one of their axes to produce an in-plane circular arrangement, or around the Z-axis to produce a cylindrical light exit window. Additionally or alternatively, using 3D printing techniques even twisted light exit windows (helical) may be possible.

[0133] Referring to Figure 1a, multiple cavities can be arranged to form a larger sized lighting device. However, the size and shape of each unit building the multiple cavities need not be the same, as a mix of scaled-up and scaled-down variants can be combined to form a light exit window that provides a richer user experience.

[0134] In an embodiment, the CCT of the first and second light engines may be the same, and the light intensity is controlled to produce a uniformly illuminated light exit window.

[0135] In an embodiment, the first and second light engines may also be tunable white light engines. When the tunable white engines are independently controlled, a wide variety of light scenes may be achieved. For example, when the first cavity is set to emit cooler white light and the second cavity is set to emit warmer white light, the illusion of an open facade behind the viewer viewing surface may be created. Or in another example, when the device is applied as a ceiling lighting device, the illusion of a blue sky is created. Even the illusion of a dark sky may be created at night when the light intensity of the first cavity is deeply dimmed. Furthermore, surreal light scenes may be created.

[0136] In an embodiment, the CCT of each of the plurality of cavities may be independently controlled for both the first cavity and the second cavity. Thus, the CCT of the proposed outdoor light emitted by the first cavity may follow a circadian rhythm throughout the day, while the second cavity may be operated statically. Alternatively, the second cavity may be operated to emit a circadian rhythm, while the first cavity may be operated statically. More preferably, both the first cavity and the second cavity may be operated following a circadian rhythm to simulate the progress of a day in terms of both light intensity and CCT.

[0137] It will be appreciated that instead of operating the entire light exit window uniformly, only a portion of the light exit window may be dynamic, for example to create the illusion of a skylight.

[0138] In an embodiment, the color and light gradient of the natural sky can also be simulated, since a (comparable) color and light gradient can appear on the viewing surface of the light device. The gradient can exist and be the same for the first cavity and the second cavity, or can be different or even opposite for the first cavity and the second cavity.

[0139] In an embodiment, the tunable white engine can be a pixelated light engine for one or both optical cavities. Thus, a very realistic illusion of leaves moving, clouds passing, or wind gusts can be simulated without the need for actual images. Additionally or alternatively, the far-field light emission can be adjusted so that almost no light fluctuations occur, such as at a work surface in an office space.

[0140] In an embodiment, a rapid change may be induced at the work surface of an office space to intentionally temporarily distract an employee, causing them to briefly look directly at a light engine providing melanin stimulation. The change in theme may be noticeable because the effect may occur 360 degrees around the employee, causing the office worker to also be triggered to move and / or turn his / her head.

[0141] An embodiment of a method for manufacturing a light generating system (1000) according to the present invention comprises the following steps:

[0142] - (a) providing a first curved and diffusely reflective element comprising a chamber wall (501) and an extension portion at least partially conformal to the first wall portion (451), wherein the extension portion comprises a first light generating device (110);

[0143] - (b) providing a second curved element comprising a first wall portion (451) and a second wall portion (452);

[0144] - (c) connecting the first element at the end of the chamber wall (501) to the second curved element at the end of the second wall portion (452) via a clamping mechanism;

[0145] - (d) connecting the first element at the end of the extension portion to the second element at the end of the first wall portion (451) via a clamping mechanism.

[0146] Steps (a)-(d) do not have to be performed in this particular order. In an embodiment of the method for manufacturing a lighting system according to the present invention, the clamping mechanism comprises an opening in one end and a matching protrusion in the other end. In one embodiment, the first element further comprises a second light generating device (120). In one embodiment, the first and second light generating devices (110, 120) have end caps for accommodating conductive wires, which are used to power the light generating devices and optionally for further controlling the light generating devices. In an embodiment of the method, steps (a)-(d) are repeated so that the desired dimensions of the light generating system (1000) are obtained. In one embodiment, the first curved and diffusely reflective element is mounted to a rigid carrier material before it is connected to the second curved element. The first and second elements can be manufactured using a polymer extrusion process. The dimensions of the first and second elements can vary depending on the requirements of the light generating system. For example, in the case of a 60×60 cm light generating system, the dimensions of the first and second elements can be 15×15 cm or 20×20 cm.

[0147] The above are only examples of various possible light scene simulations. For those skilled in the art, more examples not mentioned here are also conceivable.

[0148] The term "plurality" means two or more.

[0149] Those skilled in the art will understand the terms "substantially" or "essentially" and similar terms herein. The terms "substantially" or "essentially" may also include embodiments with "completely", "completely", "all", etc. Therefore, in embodiments, the adjectives substantially or substantially may also be removed. Where applicable, the terms "substantially" or "essentially" may also relate to 90% or higher, such as 95% or higher, particularly 99% or higher, even more particularly 99.5% or higher, including 100%.

[0150] The term "comprising" also includes embodiments in which the term "comprising" means "consisting of.

[0151] 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 item 1 and item 2. The term "comprising" may mean "consisting of" in one embodiment, but may also mean "including at least the defined categories and optionally one or more other categories" in another embodiment.

[0152] In addition, the terms first, second, third, etc. in the specification and claims are used to distinguish between similar elements and not necessarily to describe a sequential or temporal order. It should be understood that the terms so used are interchangeable under appropriate circumstances, and that the embodiments of the invention described herein are capable of operation in other sequences than those described or illustrated herein.

[0153] During operation, an apparatus, device or system may be described herein - among other things. As will be clear to one skilled in the art, the present invention is not limited to methods of operation, or apparatus, devices or systems in operation.

[0154] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims.

[0155] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0156] The use of the verb "comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly requires otherwise, throughout the specification and claims, the words "comprises," "comprising," etc. should be interpreted in an inclusive sense, rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to."

[0157] The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0158] The invention may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a device claim, or an apparatus claim, or a system claim enumerating several components, several of these components may be embodied by the same item of hardware. The mere fact that certain measures are cited in mutually different dependent claims does not indicate that a combination of these measures cannot be used advantageously. In yet another aspect, the invention (therefore) provides a software product which, when run on a computer, is capable of implementing (one or more embodiments of) the method as described herein.

[0159] The present invention also provides a control system that can control a device, apparatus or system, or can perform the method or process described herein. Still further, the present invention also provides a computer program product that, when functionally coupled to a device, apparatus or system or run on a computer included in the device, apparatus or system, controls one or more controllable elements of such a device, apparatus or system.

[0160] The present invention further applies to an apparatus, device or system comprising one or more characterizing features described in the specification and / or shown in the attached drawings. The present invention further relates to a method or process comprising one or more characterizing features described in the specification and / or shown in the attached drawings.

[0161] The various aspects discussed in this patent can be combined to provide additional advantages. In addition, those skilled in the art will appreciate that the embodiments can be combined, and more than two embodiments can also be combined. In addition, some features can form the basis of one or more divisional applications.

Claims

1. A light generating system (1000), comprising a first light generating device (110) and a unit (1100), wherein: - the first light generating device (110) is configured to provide a first device light (111) having a wavelength in the visible wavelength range; - the unit (1100) comprises, in a cross-sectional view, an open hollow portion (400) and a closed hollow portion (500); wherein the unit (1100) comprises a viewer side (1101); wherein the open hollow portion (400) is concave relative to the viewer side (1101); - the open hollow portion (400) comprises a first wall portion (451); wherein the first wall portion (451) is diffusely reflective for the first device light (111); - the closed hollow portion (500) comprises a chamber wall (501), the chamber wall (501) comprising (a) a second wall portion (452), wherein the second wall portion (452) is translucent to the first device light (111), and (b) a chamber wall portion (453), wherein the chamber wall portion (453) is diffusely reflective to the first device light (111); - the unit (1100) comprises a wall element (450) comprising a first wall portion (451) and a second wall portion (452); - a first light generating device (110) is arranged in the open hollow portion (400); wherein the first light generating device (110) is arranged to illuminate (i) at least a portion of the first wall portion (451) and (ii) at least a portion of the second wall portion (452); and - the unit (1100) and the first light generating device (110) are configured such that the first device light (111) does not escape directly from the viewer side (1101); and wherein the closed hollow portion (500) is configured such that at least a portion of the first device light (111) entering the closed hollow portion (500) via the second wall portion (452) also escapes via the second wall portion (452).

2. The light generating system (1000) according to claim 1, wherein the wall element (450) has a corrugated shape.

3. The light generating system (1000) according to any one of the preceding claims, wherein: (a) the first wall portion (451) is curved, or includes more than three small planes, or includes a curved portion and one or more small planes; and (b) wherein the second wall portion (452) is curved, or includes more than three small planes, or includes a curved portion and one or more small planes.

4. A light generating system (1000) according to any of the preceding claims, wherein the first light generating device (110) is controllable, and wherein the first device light (111) is controllable with respect to one or more of a color point and a radiant flux; wherein the light generating system (1000) further comprises a control system (300) configured to control the first light generating device (110).

5. The light generating system (1000) according to any one of the preceding claims, wherein: Assuming vertical illumination with the first device light (111), the second wall portion (452) is configured to transmit 60-95% of the first device light (111) forward; and wherein assuming vertical illumination with the first device light (111), the chamber wall portion (453) is configured to reflect at least 90% of the first device light (111).

6. The light generating system (1000) according to any of the preceding claims, further comprising a second light generating device (120) configured to provide a second device light (121) in the closed hollow portion (500), wherein the second device light (121) has a wavelength in the visible wavelength range, wherein the second wall portion (452) is translucent to the second device light (121); and wherein the unit (1100) and the second light generating device (120) are configured such that for a human user, the second light generating device (120) in a closed state is not visible to the human eye from a viewer side (1101).

7. The light generating system (1000) according to claim 6, wherein the second light generating device (120) is arranged in the closed hollow part (500), and wherein the chamber wall part (453) is diffusely reflective for the second device light (121).

8. The light generating system (1000) according to any of the preceding claims 6-7, wherein: Assuming vertical illumination with the second device light (121), the second wall portion (452) is configured to transmit 60-95% of the first device light (121) forward.

9. A light generating system (1000) according to any of the preceding claims 6-8, wherein the second light generating device (120) is controllable, and wherein the second device light (121) is controllable with respect to one or more of a color point and a radiant flux; wherein the control system (300) is configured to control the second light generating device (120).

10. A light generating system (1000) according to any of the preceding claims 6-9, wherein the light generating system (1000) is configured to provide a first device light (111) and a second device light (121) in an operating mode of the light generating system (1000), the first device light (111) and the second device light (121) having a color point with a maximum difference of 0.03 for u' and / or a maximum difference of 0.03 for v'.

11. A light generating system (1000) according to any of the preceding claims 6-10, wherein the first light generating device (110) is configured to generate white first device light (111) having a controllable first correlated color temperature, and wherein the second light generating device (120) is configured to generate white second device light (121) having a controllable second correlated color temperature.

12. A light generating system (1000) according to any of the preceding claims, wherein the unit (1100) comprises, in a cross-sectional view, two open hollow parts (400), both of which share a wall element (450) with a closed hollow part (500); wherein the unit (1100) comprises a viewer side (1101); wherein the open hollow parts (400) are concave relative to the viewer side (1101), and a closed hollow part (500) is arranged between the open hollow parts (400).

13. A method for manufacturing a light generating system (1000) according to any one of the preceding claims 1 to 12, the method comprising the following steps: - (a) providing a first curved and diffusely reflective element, the first curved and diffusely reflective element comprising a chamber wall (501) and an extension portion at least partially conformal to the first wall portion (451), wherein the extension portion comprises a first light generating device (110); - (b) providing a second curved element comprising a first wall portion (451) and a second wall portion (452); - (c) connecting the first element at the end of the chamber wall (501) to the second curved element at the end of the second wall portion (452) via a clamping mechanism; - (d) connecting the first element at the end of the extension portion to the second element at the end of the first wall portion (451) via a clamping mechanism.

14. A lighting device (1200) selected from the group of a lamp (1), a luminaire (2) and an optical wireless communication device, comprising a light generating system (1000) according to any of the preceding claims 1-13.

15. A space (1300) comprising walls (1307) and a ceiling (1310), wherein one or more of the walls (1307) and the ceiling (1310) comprises an arrangement of a plurality of light generating systems (1000) according to any one of the preceding claims 1-13.

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