Artificial Skylight

Abstract

An artificial skylight comprising a light source surrounded by a protruding rim, the outermost exposed portion of the protruding rim being less than the innermost exposed portion of the protruding rim, and the outermost exposed portion of the protruding rim being non-zero.

Description

Technical Field

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[0001] The present invention relates to the field of artificial skylights.

Background Art

[0002] The beneficial properties that daylight has on human and animal health are well documented in the literature. However, the percentage of the population spending most of their time indoors is increasing. Skylights and windows provide an opportunity to supply daylight to indoor environments, but these can only be placed at or near the boundaries of buildings and typically cannot illuminate the center of a building.

[0003] One technique to address this problem is to use artificial skylights that simulate or resemble true skylights (sometimes called natural skylights) when simulating daylight in an indoor environment. However, it has been recognized that if an artificial skylight has an unnatural appearance, the beneficial effects of the artificial skylight can be adversely affected such that a person viewing the artificial skylight does not perceive it as being a true skylight or being similar.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Therefore, it is desirable to provide an improved artificial skylight that is perceived by viewers as being similar to a true skylight.

Means for Solving the Problems

[0005] The present invention is defined by the claims.

[0006] According to an example of one aspect of the present invention, an artificial skylight is provided, which is a light source configured to output light through a light exit window, the light source comprising a light source having a first thickness, and a protruding rim surrounding the light source, the protruding rim having an inner side having an exposed portion of a first length close to the light source, an outer side having an exposed portion of a second length further from the light source than the inner side, and a front surface connecting the inner side and the outer side, wherein the first length is greater than the second length, and the second length is greater than 0 mm.

[0007] The proposed embodiment provides an artificial skylight in which the light source is perceived as recessed to a greater extent relative to the inner side than to the outer side. This causes the viewer (when the artificial skylight is mounted on the ceiling) to perceive the light source as located beyond the ceiling, thereby making it more similar to a true skylight.

[0008] In particular, when artificial skylights are mounted on the ceiling, viewers perceive the overall extent of the artificial skylight as projecting outward from the ceiling by a second length. If the first length is greater than the second length, the light source is perceived as recessed into the ceiling, like a real skylight, or positioned beyond the ceiling.

[0009] When artificial skylights are mounted on a flat surface, their inner and outer sides may be configured to be substantially perpendicular to the flat surface. This approach enhances the viewer's perception that the light source is located above the ceiling.

[0010] In some examples, the rim is ring-shaped (circular). However, the rim may be arranged in other ring shapes and / or structures, such as polygonal structures, including rectangular structures.

[0011] In some examples, the second length is smaller than the first thickness. This creates or facilitates a relatively high ratio between the first and second lengths, enhancing the perception that the light source is located above the ceiling for those viewing the artificial skylight.

[0012] In other examples, the second length is greater than the first thickness. As a result, the light source is perceived as being positioned further back relative to the outer side, enhancing the effect on the viewer's perception that the light source is located above the ceiling.

[0013] The first length may be 1.2 times or more the second length, for example, 1.5 times or more the second length, for example, 2 times or more the second length. This creates a sufficiently large perceived depth for viewers positioned further away from the artificial skylight.

[0014] The first thickness may be less than 5 mm, preferably less than 3 mm, more preferably less than 2 mm, and most preferably less than 1 mm. This embodiment provides a slim, plate-like, flat light source in which the light exit window extends into a virtual plane, reducing the noticeability of the light source, which would be unnatural to a viewer of the artificial skylight. Typically, the inner and outer sides are substantially perpendicular to the main light exit window (and therefore to the virtual plane). Such a slim light source also allows for the creation of a larger first length, enhancing the perceptual effect on the viewer of the artificial skylight that the light source is located above the ceiling, in other words, that the light source is natural light coming from above the ceiling.

[0015] In some examples, the angle between the front and the plane perpendicular to the outer side is 2° to 15°, preferably 2° to 12°, and more preferably 4° to 10°. Tilting the front at these angles reduces the visibility of the tilt to the viewer of the artificial skylight. This further enhances the perception that the light source is positioned above the ceiling, as the tilt reduces the viewer's ability to understand or recognize that the first length is greater than the second length.

[0016] Optionally, the first length is 4 mm or more, preferably 6 mm or more, more preferably 7 mm or more, and most preferably 9 mm or more. This further enhances the perception that the light source is located above the ceiling.

[0017] In some cases, the distance between the inner and outer surfaces is 40 mm or more, preferably 60 mm or more.

[0018] In some examples, the opening of the light outlet window for the light source has a width that is more than twice the distance between the inner and outer sides, for example, more than three times this distance, for example, more than five times this distance.

[0019] Optionally, the exposed portions of the inner sides are yellow. This coloring allows the inner sides to absorb blue light and provide yellow light, closely resembling the output of true skylight.

[0020] In some examples, the exposed portion of the inner side surface is configured to emit or reflect additional light having a correlated color temperature at least 500K lower than the correlated color temperature of the light source. This enhances the effect that the light source is natural light.

[0021] In some examples, the outer surfaces are also configured to emit light with a correlated color temperature different from that of the light source. This enhances the effect that the light source is natural light.

[0022] In some examples, the reflectance of the exposed portion of the outer side surface is lower than that of the exposed portion of the inner side surface. This approach effectively simulates a brighter color on the inner side surface and closely resembles the effect of the light provided by non-artificial skylight.

[0023] The difference in reflectance may be at least 30%, for example, at least 50%.

[0024] The exposed portion of the outer side surface may be darker than the exposed portion of the inner side surface. This creates the optical effect that the inner side surface is illuminated by natural light, increasing the resemblance of the artificial skylight to natural / true skylight.

[0025] Optionally, the surface roughness of the front surface is greater than that of the inner side surface and / or the outer side surface. This provides a greater contrast with the (side) surfaces and enhances the apparent recession of the light source relative to the surface on which the artificial skylight is mounted.

[0026] In some examples, when the artificial skylight is mounted on a flat surface, the outer side surface is configured to be separated by a gap of 2 mm or more from the flat surface. This provides another technique for shortening the length of the exposed portion of the outer side surface relative to the exposed portion of the inner side surface and further enhances the optical effect of making the light source appear to be located within / beyond the flat surface.

[0027] In some examples, the gap is 10 mm or less, for example, 5 mm or less. This reduces the likelihood that a person viewing the artificial skylight will identify / perceive the gap.

[0028] In some examples, the source light has a correlated color temperature of 6000 K or more. This makes the emitted light more closely resemble that of natural light, thereby increasing the resemblance between the artificial skylight and true / natural skylight.

[0029] These and other aspects of the invention will become apparent and will be elucidated with reference to the embodiments described below.

Brief Description of the Drawings

[0030] For a better understanding of the present invention and to more clearly show how the present invention can be implemented, by way of example only, the accompanying drawings are referred to. [Figure 1] Shows an artificial skylight. [Figure 2] Shows another artificial skylight. [Figure 3] Shows yet another artificial skylight. <9000109>Shows a bottom-up view of the artificial skylight.

Modes for Carrying Out the Invention

[0031] The present invention will be described with reference to the drawings.

[0032] It should be understood that the detailed description and specific examples are illustrative of exemplary embodiments of the apparatus, system and method, but are for the purpose of illustration only and are not intended to limit the scope of the present invention. These and other features, aspects and advantageous points of the apparatus, system and method of the present invention will be better understood from the following description, the appended claims and the accompanying drawings. It should be understood that the drawings are merely schematic and are not drawn to scale. It should also be understood that the same reference numerals are used throughout the drawings to indicate the same or similar parts.

[0033] The present invention provides an artificial skylight. The artificial skylight includes a light source surrounded by a protruding rim. The outermost exposed portion of the protruding rim is smaller than the innermost exposed portion of the protruding rim. The outermost exposed portion of the protruding rim is non-zero.

[0034] This disclosure recognizes that by configuring the exposed portion of the outer side surface of the rim (surrounding the light source) to be smaller than the inner side surface of the rim, an optical effect can be obtained in which the light source appears to be located within or beyond the flat surface on which the artificial skylight is mounted. This effect can be utilized to configure the artificial skylight to more closely resemble a true / natural skylight.

[0035] The embodiment can be employed in any suitable environment where having artificial skylight is beneficial, such as an office, home, clinical and / or industrial environment.

[0036] Figure 1 is a cross-sectional view of an artificial skylight 100 according to one embodiment. For clarity of the illustration, the artificial skylight is shown as being mounted on a flat surface 190, such as a ceiling or wall.

[0037] The artificial skylight 100 includes a light source 110 having a first thickness T. Here, the term “first thickness” is used to avoid ambiguity when referring later to the thickness of the light source (which may instead be called “first thickness”).

[0038] In the context of the present invention, the light source 110 is a module or component that emits or outputs light from the light output window 111. The light output through the light output window may be labeled as light source light.

[0039] The light source may be, for example, a light guide panel (including, for example, a light guide positioned between the reflector and the diffuser) or a shallow light mixing chamber. Thus, although possible, the light source does not need to generate light itself, but may simply guide the generated light out through the light exit window 111. Preferably, the light for / to the light source is generated by one or more light-emitting elements, such as light-emitting diodes (LEDs). The (multiple) light-emitting elements may be located within the light source itself or on one or more sides of the light source (for example, guiding and / or mixing the light to be output through the light exit window).

[0040] The artificial skylight 100 also includes a protruding rim 120 surrounding the light source. The protruding rim protrudes or extends from a surface 190 that is flatter than the light source (if the skylight 100 is mounted on a flat surface).

[0041] The protruding rim 120 is defined by, or includes, an inner side 121, an outer side 122, and a front surface 123. The inner side 121 is closer to the light source 110 than the outer side 121 (e.g., it is the surface of the protruding rim closest to the light source). The outer side 122 is further from the light source 110 than the inner side 121. The front surface 123 connects the inner side and the outer side. When the artificial skylight 100 is mounted on a flat surface 190, as shown in Figure 1, the front surface is the surface of the protruding rim furthest from the flat surface 190.

[0042] Of course, the protruding rim 120 may include a rear surface 124 that connects the inner and outer sides. The rear surface 124 is closer to the flat surface than the front surface when the skylight is mounted on a flat surface 190. In normal use, the rear surface 124 is at least partially hidden from the viewer's field of vision of the artificial skylight.

[0043] The inner surface 121 has an exposed portion 121A of a first length L1. The exposed portion 121A is an uncovered region or area of ​​the inner surface, for example, a portion of the inner surface that is not covered or hidden by the light source 110.

[0044] Furthermore, the outer surface 122 has an exposed portion of a second length L2. The second length L2 is not zero, i.e., it is greater than 0 mm.

[0045] Generally, the exposed portion is the part of the artificial skylight 100 that is visible or viewable to an observer when the skylight is installed on a flat surface 190 during normal operation (for example, without the need to disassemble the skylight).

[0046] When the artificial skylight 100 is mounted on a flat surface 190, both the inner side 121 and the outer side 122 extend outward from the flat surface 190. In some preferred examples, when the artificial skylight 100 is mounted on a flat surface 190, the inner side 121 and the outer side 122 are substantially perpendicular to the flat surface 190.

[0047] The first length L1 is configured to be greater than the second length L2. Thus, the first length L1 is also not zero.

[0048] As a result, the viewer of the artificial skylight 100 is given the optical illusion that the light source 110 is embedded within or located beyond the flat surface 190. This causes the viewer to perceive the light source 110 as light sent from a more distant source (i.e., like true skylight), rather than from an artificial light source attached to the flat surface.

[0049] In particular, the proposed configuration allows viewers to perceive depth within the artificial skylight, and to resemble or simulate the appearance of a natural or true skylight.

[0050] As a result, the artificial skylight 100 has a more natural appearance than existing or previous artificial skylights.

[0051] This effect increases as the difference between the first length and the second length increases.

[0052] For example, the first length L1 may be 1.2 times or more the second length L2 in order to create a greater perceived depth for a viewer positioned far from the artificial skylight.

[0053] As another example, the first length L1 may be 1.5 times or more the second length L2, for example, 2 times or more the second length L2. These approaches further enhance the effect provided by the difference between the first length L1 and the second length L2.

[0054] In some examples, the first length L1 is greater than the second length L2, and the first thickness T is less than the second length L2. This causes the light source 110 to extend outward from the flat surface to a degree less than the outer side surface 122 (when the artificial skylight is mounted on a flat surface), i.e., the light source extends so that it is recessed relative to the outer side surface 122.

[0055] In other examples, the first length L1 is greater than the second length L2, and the first thickness T is greater than the second length. This increases the ratio of the first length to the second length, thereby facilitating a greater perceived recession of the light source.

[0056] When the Skylight 100 is mounted on a flat surface 190, if there is no gap between the inner side 121 and the flat surface 190, and no gap between the outer side 122 and the flat surface 190, the difference in size between the first length and the second length will result in the front being inclined with respect to the flat surface.

[0057] If the inclination of the front surface 123 is sufficiently small, a person viewing the artificial skylight 100 will not perceive the inclination (at a distance) or will have a reduced perception of the inclination. This enhances the optical effect that makes the light source 110 appear to be located beyond the flat surface 190. In particular, a person skilled in the art will perceive that the inner surface 121 and the outer surface 122 terminate at the same distance from the flat surface 190, such that the additional length of the exposed portion 121A of the inner surface 121 compared to the exposed portion of the outer surface 122 is perceived as extending into the flat surface 190.

[0058] Therefore, to achieve this objective, the angle θ between the front surface 123 and the plane 130 perpendicular to the outer side surface 122 may be less than 15°, for example, less than 12°. More preferably, the angle θ is less than 10°.

[0059] To achieve a sufficient difference in length between L1 and L2 in order to realize the optical effect, the angle θ is preferably 2° or greater.

[0060] Preferably, the first length L1 is 4 mm or less, for example, 10 mm or less.

[0061] In a preferred example, the distance D between the inner and outer sides is 40 mm or more, preferably 60 mm or more. It will be clear that the length of the front surface 123 depends on the distance D.

[0062] The opening of the light outlet window 111 of the light source 110 may have a width W. Preferably, the width W of this opening is at least twice the distance D between the inner side and the outer side.

[0063] Table 1 shows the relationship between the value of angle θ and the perceptibility of slope / depth.

[0064] The perceptibility of inclination indicates how well a person viewing artificial skylight can perceive the angle θ under normal viewing conditions. This is rated on the following categorical scale: "--" indicates very low perceptibility; "-" indicates low perceptibility; "+" indicates medium to high perceptibility; and "++" indicates high to very high perceptibility.

[0065] Perceptibility of Depth is an indicator of the optical effect of a light source being positioned within or beyond a flat structure relative to its mounting position on the flat structure. This is also graded on the following category scale: "--" indicates very low perceptibility; "-" indicates low perceptibility; "+" indicates medium to high perceptibility; and "++" indicates high to very high perceptibility.

[0066] For the purposes of Table 1, the distance D was fixed (e.g., 50 mm), the value of L2 was fixed (e.g., 5 mm), and the value of L1 was assumed to change in accordance with the change in angle θ. The results in Table 1 were prepared under experimental conditions in which the average perceptibility of inclination and depth was evaluated for multiple sample observers.

[0067] TIFF0007862686000001.tif132154Table 1

[0068] Table 1 clearly shows that angles in the range of 2° to 15° provide a good balance of perceptibility of slope and depth, and angles in the range of 4° to 10° provide a particularly favorable balance of perceptibility of slope and depth.

[0069] Furthermore, Table 1 shows that angles smaller than 2° do not provide the desired effect on the perceptibility of depth, and are therefore less desirable.

[0070] Preferably, when the artificial skylight 100 is mounted on a flat surface 190, the light source 110 is in contact with the flat surface 190. This further reduces the perceived profile of the light source and emulates natural or true skylight.

[0071] Figure 2 shows an alternative artificial skylight 200.

[0072] Similar to the artificial skylight 100 described above, the artificial skylight 200 includes a light source 210 and a protruding rim 220. The protruding rim 220 also includes an inner side surface 221, an outer side surface 222, and a front surface 223.

[0073] The artificial skylight 200 differs from the artificial skylight 100 described above in that, when the artificial skylight 200 is attached to a flat surface 190, the protruding rim 220 is configured such that the outer side surface 222 is separated from the flat surface 190 by a gap G. Thus, a gap G is formed between the outer side surface 222 and the flat surface 190.

[0074] The presence of the gap reduces the size of the second length L2 (of the exposed portion on the outer side). This further enhances the optical effect that makes the viewer perceive the light source 210 as being located within / beyond the flat surface on which the skylight 200 is mounted.

[0075] For people viewing the Artificial Skylight 200, a gap of appropriate size G is either imperceptible or difficult to determine or perceive the exact size of the gap.

[0076] In some cases, the gap G is less than 10 mm, for example, less than 5 mm. This reduces the likelihood that someone viewing artificial skylight will identify / perceive the gap.

[0077] The gap may be larger than 2 mm, for example, larger than 3 mm. This approach enhances the optical effect of the light source being within / beyond a flat surface 190.

[0078] Any of the features or characteristics of the artificial skylight described above can be implemented in the artificial skylight 200.

[0079] Figure 3 shows another artificial skylight 300.

[0080] Similar to the artificial skylight 200 described above, the artificial skylight 300 includes a light source 310 and a protruding rim 320. The protruding rim 320 also includes an inner side surface 321, an outer side surface 322, and a front surface 323.

[0081] The artificial skylight 300 differs from the alternative artificial skylight 200 described above in that its front surface 323 is not inclined with respect to a plane perpendicular to the flat surface 190 and / or outer side surface 322. This approach utilizes only a gap G to make the length L1 of the exposed portion of the inner side surface 321 greater than the length L2 of the exposed portion of the outer side surface 322.

[0082] Any of the aforementioned features or characteristics of the artificial skylight can be implemented in the artificial skylight 300.

[0083] Figure 4 shows an artificial skylight 400 mounted on a flat surface 190 according to one embodiment. In particular, Figure 4 shows a bottom-up view of the artificial skylight 400.

[0084] The artificial skylight 400 includes a light source 410 and a protruding rim 420. The light source 410 is entirely surrounded or bounded by the protruding rim 420.

[0085] In the illustrated example, the protruding rim 420 is ring or annular, and the light source has a corresponding circular or cylindrical shape.

[0086] The cross-sectional shape of the artificial skylight 400 may be embodied as any of the artificial skylights described above, for example, any artificial skylight described with reference to any of Figures 1 to 4.

[0087] Further optional features of the artificial skylight, more specifically, the protruding rim of the artificial skylight, are described below. These optional features can be advantageously implemented in any embodiment of the artificial skylight described herein.

[0088] In at least one example, the exposed portion of the inner side is yellow. This coloring causes the inner side to absorb blue light and provide yellow light, more closely resembling the output of true or natural skylight.

[0089] In some examples, the exposed portion of the inner side surface is configured to emit or reflect additional light having a correlated color temperature at least 500K lower than the correlated color temperature of the light source. This enhances the effect that the light source is natural light.

[0090] In some examples, the outer surfaces are also configured to emit light with a correlated color temperature different from that of the light source. This enhances the effect that the light source is natural light.

[0091] Thus, each inner and / or outer side may include one or more light-emitting devices, such as light-emitting diodes, for generating and emitting light.

[0092] In some cases, the color or shade of the exposed outer side is darker than that of the exposed inner side. In some cases, the reflectivity of the exposed outer side is lower than that of the exposed inner side.

[0093] All of these approaches make the inner surface appear to have enhanced lamination compared to the outer surface, creating the perception that the inner surface is illuminated by natural light, thus increasing the similarity of the artificial skylight to natural / true skylight. This effect is enhanced even if the outer and inner surfaces are the same color (e.g., yellow), but their shades are different.

[0094] In some examples, the front surface has a color or reflectance that gradually changes from a first color / reflectance (closest to the inner side) to a second color / reflectance (closest to the outer side). When used, the first color is brighter than the second color. When used, the first reflectance is greater than the second reflectance. This also gives the perception that the side closest to the inner side is illuminated, for example, by natural light. This enhances the perception that the artificial skylight is natural / true skylight, i.e., increases the similarity of the artificial skylight to natural / true skylight.

[0095] In some examples, the front surface has a greater surface roughness Ra than at least the inner sides (and optionally the outer sides). This causes the inner sides to reflect more light than the front surface, resulting in the inner sides appearing more fully illuminated by natural light. This enhances the perception that the artificial skylight is natural / true skylight, i.e., increases the similarity of the artificial skylight to natural / true skylight.

[0096] The above-described embodiments of artificial skylight utilize a light source. Many optional but advantageous features relating to such light sources are described below, and these can be implemented in any embodiment of artificial skylight described herein.

[0097] In some examples, the thickness T of the light source is less than 10 mm, more preferably less than 5 mm. This provides a slim light source that further reduces the visibility or perceptibility of the light source to the viewer or observer of the artificial skylight. Thus, it is preferable that the thickness T of the light source be as thin as possible.

[0098] In some examples, the light source is configured to produce light with a correlated color temperature of 6000K or higher. More specifically, the light source is preferably configured to produce light with a correlated color temperature (CCT) of 6000K or higher. This more faithfully simulates natural light and brings the perceived appearance of artificial skylight closer to the perceived appearance of natural / true skylight.

[0099] Of course, the light source may be configured such that the correlated color temperature (CCT) of the light source can be controlled and / or changed. For example, the correlated color temperature may be variable within a predetermined range, for example, in response to user input. A preferred example of such a range is 1800K to 20000K. Examples of light sources capable of emitting light within such a range are well established in the art.

[0100] The light source may have a diameter or width of 0.1 m or more, for example, 0.2 m or more. In some examples, the light source has a diameter or width of 2 m or less, for example, 1 m or less. For example, the light source may have a diameter of 0.1 m to 1 m. It has been confirmed that the optical effects of the present invention can be observed for light sources having at least these sizes.

[0101] Any artificial skylight described herein may include additional electronic / circuit components, for example, for powering, driving, and / or controlling the light source of the artificial skylight. Preferably, any such electronic components are housed or incorporated at least partially within a protruding rim. This technique helps to cover or conceal the components so that the artificial skylight closely resembles a natural / true skylight.

[0102] Similarly, the light source may be associated with one or more light-emitting elements (e.g., one or more LEDs). The one or more light-emitting elements may be positioned as part of the light source itself, or they may be positioned outside the light source to receive the emitted light and redirect the received light out through a light exit window.

[0103] One or more light-emitting elements may be housed at least partially within the protruding rim, but may be positioned so that light is supplied to the light source for outward radiation through the light exit window. Alternatively, one or more light-emitting elements may be housed entirely within the light source itself, i.e., the light source may generate light emitted from the light exit window.

[0104] An artificial skylight may include one or more mounting components for attaching the artificial skylight to a flat surface. Suitable mounting components are well known in the industry and include screws, nails, clip elements, adhesives (e.g., glue), or other similar products that can attach or support the artificial skylight to a flat surface such as a ceiling or wall.

[0105] By examining the drawings, this disclosure, and the appended claims, modifications to the disclosed embodiments can be understood by those skilled in the art and can be implemented in carrying out the claimed invention. In the claims, the word “comprising” does not exclude other components or steps, and the indefinite article “a” or “an” does not exclude plural.

[0106] The mere fact that certain means are enumerated in different dependent claims does not indicate that combinations of these means cannot be used advantageously.

[0107] Note that when the term "adapted to" is used in the claims or specification, it is intended to be equivalent to the term "configured to." Note that when the term "arrangement" is used in the claims or specification, it is intended to be equivalent to the term "system," and vice versa.

[0108] No reference numeral in the claims should be construed as limiting the scope.

Claims

1. A light source configured to output light through a light outlet window, wherein the light source has a first thickness, A protruding rim surrounding the light source, The inner surface having an exposed portion of a first length, adjacent to the light source, The outer surface having an exposed portion of a second length, which is further from the light source than the inner surface, and Front surface connecting the inner surface and the outer surface, A protruding rim having, Includes, The first length is greater than the second length, and the second length is greater than 0 mm. An artificial skylight in which the angle between the front surface and the plane perpendicular to the outer side surface is 2° to 15°.

2. The artificial skylight according to claim 1, wherein, when mounted on a flat surface, the inner side and the outer side are substantially perpendicular to the flat surface.

3. The artificial skylight according to claim 1 or 2, wherein the protruding rim is ring-shaped.

4. The artificial skylight according to claim 1 or 2, wherein the second length is smaller than the first thickness.

5. The artificial skylight according to claim 1 or 2, wherein the second length is greater than the first thickness.

6. The artificial skylight according to claim 1 or 2, wherein the first length is 1.5 times or more the second length.

7. The artificial skylight according to claim 1 or 2, wherein the first thickness is less than 5 mm.

8. The artificial skylight according to claim 1 or 2, wherein the first length is 4 mm or more.

9. The artificial skylight according to claim 1 or 2, wherein the distance between the inner side surface and the outer side surface is 40 mm or more, and the opening of the light outlet window of the light source has a width of at least twice the distance between the inner side surface and the outer side surface.

10. The artificial skylight according to claim 1 or 2, wherein the exposed portion of the inner side surface is configured to (i) be yellow and / or (ii) emit or reflect further light having a correlated color temperature at least 500 K lower than the correlated color temperature of the light source.

11. The artificial skylight according to claim 1 or 2, wherein the reflectance of the exposed portion of the outer side surface is lower than the reflectance of the exposed portion of the inner side surface.

12. The artificial skylight according to claim 1 or 2, wherein the exposed portion of the outer side surface has a darker color than the exposed portion of the inner side surface.

13. The artificial skylight according to claim 1 or 2, wherein the surface roughness of the front surface is greater than the surface roughness of the inner side surface and / or the outer side surface.

14. The artificial skylight according to claim 1 or 2, wherein, when mounted on a flat surface, the outer side surface is spaced at least 2 mm from the flat surface, and optionally, the gap is 10 mm or less.

15. The artificial skylight according to claim 1 or 2, wherein the light source has a correlated color temperature of 6000K or higher.

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