light

Abstract

Luminaire, especially for use in a suspended ceiling, including a housing (20) with an inner surface (21) and an outer surface (22), several LED elements (30), and a diffuser plate (40) with a first upper side (41) and with a second lower side (42), wherein the housing (20) comprises a base (23) with a side wall (24) circumferential along a base circumference, wherein the side wall (24) has at an end facing away from the ground (23) a connecting section (25) which extends at least partially around a side wall circumference and a bearing surface (26), wherein the diffuser plate (40) is inseparably clamped at its edge between the support surface (26) and the folded connecting section (25), wherein the folded connecting section (25) is plastically deformed via a bend (50), characterized by that the folded connecting section (25) is folded in one direction towards the support surface (26) over a bend by 180°, and that the housing (20) comprises several connecting sections (25), which connecting sections (25) are separated from each other by at least one cut (27).

Description

[0001] The invention relates to a luminaire according to the preamble of claim 1.

[0002] So-called LED backlit recessed luminaires for use in grid ceilings are well known in practice. These recessed luminaires are preferably used in office and commercial spaces, for example. However, the production of these previous recessed luminaires is complex and time-consuming, as a diffuser plate must be mounted to the recessed luminaire housing using screws and / or locking elements.

[0003] US 2018 / 0259161 A1 shows a luminaire, comprising a housing with an inner surface and an outer surface, a plurality of LED elements, and a diffuser plate with a first upper side and a second lower side, wherein the housing comprises a base with a side wall running along a base circumference, wherein the side wall has, at an end facing away from the base, a connecting section running at least partially along a side wall circumference and a support surface, wherein the diffuser plate is permanently clamped at the edge between the support surface and the folded connecting section, wherein the folded connecting section is plastically deformed via a bend.

[0004] KR 102 050 195 B1 shows a luminaire, comprising a housing with an inner surface and an outer surface, a light source, and a diffuser plate with a first upper side and a second lower side, wherein the housing comprises a base with a side wall running around a base circumference, wherein the side wall has, at an end facing away from the base, a connecting section running around at least part of a side wall circumference and a support surface, wherein the folded connecting section is plastically deformed via a bend, and wherein the folded connecting section is folded by 180° in a direction towards the support surface via the one bend.

[0005] US 2016 / 0369951 A1 shows a luminaire comprising a housing with an inner surface and an outer surface, a plurality of LED elements, and two diffuser plates, each with a first upper side and a second lower side, wherein the housing comprises a base with a side wall running along a base circumference, wherein two cutouts for inserting a diffuser plate are arranged in the base of the housing, wherein each diffuser plate is clamped at the edge between the base and a reflector in a non-releasable manner via folded tabs, wherein the folded tabs are plastically deformed via a bend, and wherein adjacent tabs are separated from one another.

[0006] CN 218268911 U shows a luminaire, comprising a housing with an inner surface and an outer surface, a plurality of light sources, and a diffuser plate with a first upper side and a second lower side, as well as a frame, wherein the frame has a central cutout and a plurality of foldable folding sections, which folding sections are separated from one another by at least one cut, wherein the housing comprises a base with a side wall running around a base circumference, wherein the side wall has, at an end facing away from the base, a connecting section running around at least some of a side wall circumference and a support surface, wherein the diffuser plate is irremovably clamped at the edge between the frame and at least one folding section of the frame, wherein the folded folding section is plastically deformed via a bend.

[0007] US 2008 / 0084693 A1 describes a luminaire comprising a housing with an inner surface and an outer surface, a plurality of LED elements, and a diffuser plate with a first upper side and a second lower side. The housing comprises a base with a side wall extending along a base circumference. The side wall, at an end facing away from the base, has a connecting section extending at least partially along a side wall circumference and a support surface for attaching the diffuser plate. The diffuser plate is connected to the housing via a screw connection.

[0008] The object of the invention is to create a lamp whose production is simpler and faster.

[0009] This object is achieved according to the invention by a luminaire having the features of claim 1.

[0010] According to the invention, a luminaire is provided, in particular for use in a grid ceiling, comprising a housing with an inner surface and an outer surface, a plurality of LED elements, and a diffuser plate with a first upper side and a second lower side, wherein the housing comprises a base with a side wall running along a base circumference, wherein the side wall has, at an end facing away from the base, a connecting section running at least partially along a side wall circumference and a support surface for fastening the diffuser plate, wherein the diffuser plate is permanently clamped at the edge between the support surface and the folded connecting section, wherein the folded connecting section is plastically deformed via a bend.The luminaire is characterized in that the folded connecting section is folded by 180° in a direction towards the support surface via the one bend, and in that the housing comprises a plurality of connecting sections which are separated from one another by at least one cut. Advantageously, the housing comprises at least one material section which, when folded over, creates a force-fitting clamping connection between the diffuser plate and the housing. No further connecting means such as screws, adhesives or locking means are necessary to create a quick and reliable connection between the diffuser plate and the housing. Furthermore, it is advantageous that no holes have to be drilled beforehand either in the housing or in the diffuser plate, whereby drilling is always time-consuming and causes additional labor and tool costs. Furthermore, the diffuser plate orwhose holes are no longer aligned with the holes in the housing in order to fasten the diffuser plate using screws. The diffuser plate can now be placed intuitively on the designated support surface of the housing, with the respective connecting section then being folded in such a way that the diffuser plate is permanently connected to the housing at the edges. Time-consuming alignment and screwing of the diffuser plate is therefore no longer necessary, so that the assembly of the luminaire is easier and faster. Furthermore, the luminaire is not only suitable for use in grid ceilings, but also in grid floors, e.g. stages, terrace floors, shop windows, etc., and in grid walls as wall lighting, whereby the location of the luminaire in, e.g.Offices, schools, universities, workshops, factories, garages, commercial properties such as supermarkets as well as in wholesale and retail, hotels, doctor's offices, hospitals, retirement homes, ships and boats, airplanes and airports, advertising spaces, e.g. billboards and advertising hoardings, museums as well as in private buildings and premises, etc.

[0011] Plastic deformation of the connecting section advantageously provides increased clamping force and thus increased connection stability, with the diffuser plate permanently connected to the housing. Furthermore, the diffuser plate is evenly connected to the housing along its entire edge length, rather than just at specific points as is the case with a screw connection, so that the diffuser plate is positioned flush and level within the housing, thus providing uniform illumination.

[0012] Advantageously, the entire connecting section is folded inwards towards a light source of the luminaire, so that the connecting section is arranged in a clamping manner evenly on an edge region of the diffuser plate in order to provide both a reliable connection of the diffuser plate to the housing and a reliable seal against dust, moisture, dirt, etc.

[0013] The respective connecting sections are advantageously divided into individual segments that are separated from each other to allow for a uniform folding of each connecting section. The connecting sections are thus connected only to one body of the housing, with the side wall of the housing merging seamlessly into the respective connecting section.

[0014] The bend expediently has a radius in the range of 0.5 mm to 2 mm, preferably 0.8 mm to 1.5 mm, and particularly preferably 1 mm. Advantageously, the connection has no sharp edges, thus preventing injuries and / or damage during assembly. Furthermore, a radius in a bend increases the stability of the connection, preventing material breakage or failure by reducing stress peaks within the bend, thus ensuring a durable and reliable connection between the diffuser plate and the housing.

[0015] Preferably, the diffuser plate rests with its second lower side on the edge of the support surface, with the folded connecting section resting on the opposite first upper side of the diffuser plate, so that the diffuser plate is clamped at its edge between the support surface and the connecting section of the side wall. Advantageously, the support surface serves both as an assembly aid and as a base for a clamp connection. This advantageously creates a quick and reliable connection between the diffuser plate and the housing, without the need for additional fastening devices.

[0016] Advantageously, the diffuser plate, the support surface, and the folded connecting section are parallel. This promotes uniform illumination by the LED elements, with the LED elements being spaced at an identical distance from the diffuser plate, as the diffuser plate is not arranged in an unintentionally curved and / or crooked and / or offset manner within the housing.

[0017] Preferably, the folded connecting section and the diffuser plate enclose a hollow space. Both the diffuser plate and the housing can undergo material expansion or shrinkage due to temperature changes, so the hollow space is advantageously provided as a buffer for a change in length of the housing and / or the diffuser plate, ensuring that the diffuser plate always has a flat shape.

[0018] The folded connecting section is expediently longer than the support surface. The folded connecting section is advantageously designed as a reliable support element for the diffuser plate, especially when the luminaire is mounted in a grid ceiling. Furthermore, a longer connecting section provides the diffuser plate with a permanently flat surface.

[0019] In a preferred embodiment, the housing comprises a sheet metal part made of steel. A steel material advantageously exhibits increased stability, which is suitable, on the one hand, for reliable installation in a grid arrangement such as a grid ceiling, and, on the other hand, for a durable clamp connection of the diffuser plate. Furthermore, a steel material is bendable and plastically deformable, and it advantageously conducts heat from the housing interior to the outside, thus preventing heat buildup in the housing interior, thus making the luminaire durable and reliable. Furthermore, a steel material can be mass-produced cost-effectively.

[0020] According to a further preferred embodiment, the housing comprises a sheet metal part made of an aluminum alloy. Advantageously, an aluminum alloy has increased stability, which is suitable on the one hand for reliable installation in a grid arrangement such as a grid ceiling and on the other hand for a long-lasting clamp connection of the diffuser plate, wherein a housing made of an aluminum alloy has a reduced weight, which is particularly advantageous, for example, in aircraft. Furthermore, an aluminum alloy is bendable and plastically deformable and it advantageously conducts heat from the interior of the housing to the outside, so that heat build-up in the interior of the housing is avoided, whereby the luminaire is long-lasting and reliable. Furthermore, an aluminum alloy can be mass-produced cost-effectively.

[0021] The housing preferably has a wall thickness in the range of 0.2 mm to 1.5 mm, preferably 0.3 mm to 1 mm, and particularly preferably 0.4 mm. The wall thickness of the housing is advantageously very thin, so that the luminaire has a low weight. Furthermore, heat conduction through a thin housing wall is particularly rapid, preventing heat buildup in the interior of the housing. Furthermore, the housing's manufacturing process is material- and environmentally friendly, thus enabling cost savings.

[0022] The housing is expediently a one-piece deep-drawn part. Advantageously, the housing shape is created in a deep-drawing sheet metal forming process using forming tools, e.g., a punch and a sheet metal holder, from a sheet metal blank of a metallic material. Furthermore, the sheet thickness remains unchanged during deep-drawing. Using the deep-drawing process, a wide variety of shapes can be manufactured quickly and reproducibly in just a few steps, thereby reducing manufacturing costs. Furthermore, the entire housing can advantageously be manufactured in one piece, so that the foldable connecting section and the side wall are also formed as a single unit, ensuring uniform stability at the transition from the side wall to the foldable connecting section.

[0023] Overall, it is advantageous for the housing to have several beads. Beads designed as groove-shaped depressions advantageously increase the stability of the housing, so that the housing has a certain rigidity, particularly against torsional forces. Furthermore, the beads always keep the housing shape in a desired state, allowing the luminaire to be reproducibly inserted into a grid arrangement – ​​and without tilting. As a result, beads give the thin-walled housing a certain stiffness, which makes the housing robust against unwanted deformation or vibration. Furthermore, beads increase heat conduction due to their rib-like shape, as there is a larger housing surface, preventing heat build-up in the housing interior.

[0024] According to a preferred embodiment, the LED elements are arranged on the inner surface of the base along the ribs. The ribs advantageously have groove-shaped recesses that serve as an assembly and positioning aid for securing the LED elements. Thus, the LED elements can always be arranged at equal spacing from one another within the interior of the luminaire's housing.

[0025] The LED elements are advantageously arranged in a grid pattern. To ensure homogeneous illumination, the LED elements are distributed evenly, particularly in a checkerboard pattern, throughout the housing.

[0026] Preferably, the side wall protrudes from the base at a first angle, which is in a range of 20° to 85°, preferably 30° to 60°, and particularly preferably 55°. Advantageously, the side wall and a base of the housing enclose a defined angle, so that the luminaire can be inserted into a defined grid arrangement.

[0027] The side wall and the support surface advantageously form a second angle, which is in a range of 90° to 160°, preferably 100° to 130°, and particularly preferably 125°. The support surface is advantageously designed horizontally to create a uniform clamping connection when assembling the diffuser plate with the housing.

[0028] In an advantageous embodiment, the inner surface of the housing comprises, at least in sections, a cladding layer with a first reflective layer, and the first reflective layer has a layer thickness of 0.01 mm to 0.1 mm, particularly preferably 0.08 mm. A reflective layer advantageously increases the illuminance of the luminaire, particularly generating homogeneous illumination. Furthermore, the cladding layer is designed to protect, for example, a metallic housing material against corrosion.

[0029] In a further preferred embodiment, the outer surface of the housing comprises, at least in sections, a cladding layer with a second reflective layer, and the second reflective layer has a layer thickness of 0.01 mm to 0.1 mm, particularly preferably 0.07 mm. The outer cladding layer advantageously serves to protect a metallic housing material from corrosion.

[0030] The sheathing layer preferably comprises polypropylene. Polypropylene, a plastic material, exhibits excellent thermal, mechanical, and chemical properties, making it suitable for use as an insulating sheath and as a protective coating against corrosion. Furthermore, polypropylene can be produced cost-effectively for virtually all applications.

[0031] Preferably, the housing is powder-coated. Advantageously, any geometric shape, even complex ones, can be painted or treated using a powder coating, allowing for quick and easy corrosion protection and a reflective layer. Furthermore, a defined layer thickness and color can be specified during the powder coating process.

[0032] In an advantageous embodiment, the housing is rectangular, square, circular, elliptical, or a combination of these geometric shapes. The luminaire can advantageously have any shape that can be inserted into a corresponding grid arrangement. The clamp connection between the diffuser plate and the housing is thus not dependent on a specific luminaire shape.

[0033] The housing expediently has at least one opening. The opening in the housing serves as a passage for electrical cable connections or lines for an electrical installation associated with the LED elements. Furthermore, the opening can advantageously include at least one strain relief to prevent cable breakage.

[0034] The diffuser plate preferably has a wall thickness in the range of 0.5 mm to 6 mm, preferably 0.8 mm to 2 mm, and particularly preferably 1 mm. A thin diffuser plate advantageously enables improved light output or increased illuminance, depending on the application.

[0035] The diffuser plate is preferably made of a transparent plastic, particularly polystyrene, polycarbonate, polymethyl methacrylate, polyvinyl chloride, or PETG. Polystyrene, for example, is advantageously a transparent or crystal-clear plastic that offers a high surface quality and good light transmission. Polystyrene, in particular, exhibits high rigidity, resistance to fracture, and medium hardness, making it an ideal material for a diffuser plate. Polycarbonate or polymethyl methacrylate are advantageously UV- and weather-resistant, making them suitable for outdoor use. Furthermore, polycarbonate or polymethyl methacrylate exhibit increased fracture and impact resistance. While the plastics polyvinyl chloride and PETG are not UV- and weather-resistant, they advantageously have very good fracture behavior.

[0036] Further advantages, developments and features of the invention will become apparent from the following description of a preferred embodiment and from the dependent claims.

[0037] The invention will now be explained in more detail with reference to the accompanying drawings using a preferred embodiment. Fig. 1 shows a perspective view of a front side of a luminaire in an assembled state. Fig. 2 shows an enlarged view of a section I of the luminaire from Fig. 1. Fig. 3 shows a perspective view of the back of the lamp. Fig. 4 shows a side view of the luminaire. Fig. 5 shows a sectional view BB of the luminaire from Fig. 4. Fig. 6 shows an enlarged view of a section II of the lamp from Fig. 5. Fig. 7 shows an enlarged view of a section III of the lamp from Fig. 6.

[0038] Fig. 1 shows a perspective view of a light-emitting front side of a 620 mm x 620 mm square-shaped luminaire 10, which is designed as an LED back-lit panel, for use in a grid ceiling.

[0039] The luminaire 10 comprises a trough-shaped housing 20 made of SPCC steel, which is powder-coated, and a transparent diffuser plate 40 designed as a luminaire cover with a first upper side 41, wherein the diffuser plate 40 is made of polystyrene.

[0040] Furthermore, the luminaire 10 comprises four folded, linear connecting sections 25, which permanently clamp the diffuser plate 40 at the edges. Furthermore, the luminaire 10 comprises an electrical cable 80 for connection to a power supply (not shown here).

[0041] Fig. Figure 2 shows an enlarged view of a corner area of ​​the luminaire 10. Two adjacent connecting sections 25 are shown, separated from each other by a cut 27. Thus, each connecting section 25 encompasses an entire edge length of a square body of the housing 20.

[0042] Fig. 3 and Fig. 4 show a perspective view of a rear side and a side view of the luminaire 10, respectively, wherein the housing 20 comprises a closed base 23 with a side wall 24 running along a base circumference, wherein the side wall 24 has, at an end facing away from the base 23, a plurality of connecting sections 25 running along a side wall circumference.

[0043] Furthermore, the housing 20 comprises a plurality of beads 29, which are visible on an outer surface 22 of the base 23 of the housing 20. Furthermore, the electrical cable 80 is visible, which is passed through an opening 70 in the housing 20.

[0044] Fig. Figure 5 shows a sectional view BB of the luminaire 10, with the LED elements 30 now visible, which are arranged on the base 23 of the housing 20 and secured by means of an adhesive layer. The LED elements 30, which function as the light source of the luminaire 10, are so-called LED chips or chip-on-board LEDs. The LED elements 30 are thus arranged in an interior of the housing 20 below the diffuser plate 40. When switched on, the LED elements 30 emit light in a direction toward the diffuser plate 40.

[0045] Fig. 6 shows an enlarged sectional view of the side wall 24 of the housing 20 and an edge section of the diffuser plate 40 clamped in a bend 50 with a first upper side 41 and a second lower side 42.

[0046] Here, the side wall 24 extends at a first angle α from the base 23 of the housing 20, wherein a height of the housing is 33.1 mm. The side wall 24 of the housing 20 comprises an inner surface 21 and an outer surface 22, wherein at an end opposite the base 23, the side wall 24 encloses a second angle β with a horizontal support surface 26, wherein the side wall 24, the support surface 26 and the connecting section 25 are formed in one piece with an identical wall thickness of 0.4 mm. Furthermore, the unfolded connecting section 25' is shown schematically as a dotted line, which is formed horizontally before the clamping connection to the support surface 26.

[0047] Furthermore, the connecting section 25 folded by 180° has a first lower side 25a and a second upper side 25b. The diffuser plate 40 rests with the second lower side 42 of the diffuser plate 40 at the edge on the support surface 26 of the housing 20, with the folded connecting section 25 resting with its first lower side 25a on the opposite first upper side 41 of the diffuser plate 40, so that the diffuser plate 40 is arranged at the edge in a non-releasably clamped manner between the support surface 26 and the connecting section 25 of the side wall 24.

[0048] Furthermore, the folded connecting section 25 has a radius r, according to which all four edges of the clamp connection are rounded to prevent injuries and mechanical stress peaks. The non-detachable clamp connection of the diffuser plate 40 further has a cavity 28 to provide a buffer in the event of any change in length of the housing 20 and / or the diffuser plate 40 due to a temperature change.

[0049] Fig. 7 shows an enlarged sectional view of a housing material of the housing 20. The housing 20 comprises a metallic shell 20a made of SPCC steel with a thickness of 0.25 mm and a cladding layer 60 formed as a first reflective layer 61 on the inner surface 21 with a thickness of 0.08 mm. The outer surface 22 of the housing 20 has a further cladding layer 60 formed as a second reflective layer 62 with a thickness of 0.07 mm. The cladding layer 60 made of polypropylene is applied to the shell 20a of the housing 20 by means of powder coating, wherein the cladding layer 60 serves as corrosion protection on the one hand and as a reflective layer 61, 62 on the other. The total wall thickness of the housing 20 is thus 0.4 mm.

[0050] The invention works as follows: First, the desired LED elements 30 are evenly distributed in a grid pattern on the inner surface 21 of the powder-coated housing 20, secured, and provided with electrical connections and any cables, with at least one cable 80 for the power connection being guided through the opening 70. Then, the diffuser plate 40 is placed at its edge with its second lower side 42 plane-parallel to the circumferential support surface 26 of the housing. Subsequently, the four horizontal foldable connecting sections 25', each of which protrudes outward from the side wall 24 of the housing 20 like a foldable wing, are folded evenly by 180° simultaneously or successively in a direction toward the first upper side 41 of the diffuser plate 40, wherein Fig. 6 a dashed arrow schematically indicates a direction of movement of a connecting section 25'.

[0051] As a result, a force-locking and non-detachable clamped connection of a composite is provided by clamping an edge portion of the diffuser plate 40 between the support surface 26 and the folded connecting portion 25 of the housing 20. This bend 50 is performed four times in this application example, since the square housing 20 has four foldable, rectilinear connecting portions 25', so that the diffuser plate 40 is uniformly secured along its entire circumference via the respective connecting portions 25.

[0052] The invention has been explained above using an exemplary embodiment in which a circumference of the diffuser plate 40 is completely enclosed by the connecting sections 25. It is understood that the connecting sections clamp the diffuser plate only in sections and not along the entire circumference of the diffuser plate.

[0053] The invention has been explained above using an exemplary embodiment in which a simple, permanent clamping connection is established by means of a frictional connection. It is understood that the clamping connection between the diffuser plate and the housing has at least one embossed through-hole and / or at least one clinch connection to increase the stability of the connection.

[0054] The invention has been explained above using an exemplary embodiment in which the connecting sections are linear. It is understood that the connecting sections may also have a curved profile. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] US 2018 / 0259161 A1

[0003] KR 102 050 195 B1

[0004] US 2016 / 0369951 A1

[0005] CN 218268911 U

[0006] US 2008 / 0084693 A1

[0007]

Claims

[1] Luminaire, in particular for use in a grid ceiling, comprising a housing (20) with an inner surface (21) and an outer surface (22), several LED elements (30), and a diffuser plate (40) having a first upper side (41) and a second lower side (42), wherein the housing (20) comprises a base (23) with a side wall (24) extending along a base circumference, wherein the side wall (24) has, at an end facing away from the base (23), a connecting section (25) which runs at least partially around a side wall circumference and a support surface (26), wherein the diffuser plate (40) is permanently clamped at the edge between the support surface (26) and the folded connecting section (25), wherein the folded connecting section (25) is plastically deformed via a bend (50), characterized by , that the folded connecting section (25) is folded in a direction towards the support surface (26) over the one bend by 180°, and that the housing (20) comprises a plurality of connecting sections (25), which connecting sections (25) are separated from one another by at least one cut (27). [2] Luminaire according to claim 1, characterized by that the bend (50) has a radius (r) which is in a range from 0.5 mm to 2 mm, preferably from 0.8 mm to 1.5 mm and particularly preferably 1 mm. [3] Luminaire according to claim 1 or 2, characterized by that the diffuser plate (40) rests with the second lower side (42) on the edge side on the support surface (26), and that the folded connecting section (25) rests on the opposite first upper side (41) of the diffuser plate (40), so that the diffuser plate (40) is arranged clamped on the edge side between the support surface (26) and the connecting section (25) of the side wall (24). [4] Luminaire according to one of claims 1 to 3, characterized by that the diffuser plate (40), the support surface (26) and the folded connecting section (25) are parallel. [5] Luminaire according to one of claims 1 to 4, characterized by that the folded connecting section (25) and the diffuser plate (40) enclose a cavity (28). [6] Luminaire according to one of claims 1 to 5, characterized by that the folded connecting section (25) is longer than the support surface (26). [7] Luminaire according to one of claims 1 to 6, characterized by that the housing (20) comprises a sheet metal part (20a) made of steel. [8] Luminaire according to one of claims 1 to 7, characterized by that the housing (20) comprises a sheet metal part (20a) made of an aluminum alloy. [9] Luminaire according to one of claims 1 to 8, characterized bythat the housing (20) has a wall thickness which is in a range from 0.2 mm to 1.5 mm, preferably from 0.3 mm to 1 mm and particularly preferably 0.4 mm. [10] Luminaire according to one of claims 1 to 9, characterized by that the housing (20) is a one-piece deep-drawn part. [11] Luminaire according to one of claims 1 to 10, characterized by that the housing (20) has several beads (29). [12] Luminaire according to claim 11, characterized by that the LED elements (30) are arranged on the inner surface (21) of the base (23) along the beads (29). [13] Luminaire according to one of claims 1 to 12, characterized by that the LED elements (30) are arranged in a gridded arrangement. [14] Luminaire according to one of claims 1 to 13, characterized bythat the side wall (24) protrudes from the base (23) at a first angle (α) which is in a range from 20° to 85°, preferably from 30° to 60° and particularly preferably 55°. [15] Luminaire according to one of claims 1 to 14, characterized by that the side wall (24) and the support surface (26) enclose a second angle (β) which is in a range from 90° to 160°, preferably from 100° to 130° and particularly preferably 125°. [16] Luminaire according to one of claims 1 to 15, characterized by that the inner surface (21) of the housing (20) comprises, at least in sections, a cladding layer (60) with a first reflective layer (61), and that the first reflective layer (61) has a layer thickness of 0.01 mm to 0.1 mm, particularly preferably 0.08 mm. [17] Luminaire according to one of claims 1 to 16, characterized bythat the outer surface (22) of the housing (20) comprises at least in sections a jacket layer (60) with a second reflective layer (62), and that the second reflective layer (62) has a layer thickness of 0.01 mm to 0.1 mm, particularly preferably 0.07 mm. [18] Luminaire according to claim 16 or 17, characterized by that the sheath layer (60) comprises a polypropylene. [19] Luminaire according to one of claims 1 to 18, characterized by that the housing (20) is powder-coated. [20] Luminaire according to one of claims 1 to 19, characterized by that the housing (20) is rectangular, square, circular, elliptical or a combination of these geometric shapes. [21] Luminaire according to one of claims 1 to 20, characterized by that the housing (20) has at least one opening (70). [22] Luminaire according to one of claims 1 to 21, characterized bythat the diffuser plate (40) has a wall thickness which is in a range from 0.5 mm to 6 mm, preferably from 0.8 mm to 2 mm and particularly preferably 1 mm. [23] Luminaire according to one of claims 1 to 22, characterized by that the diffuser plate (40) is made of a transparent plastic, in particular of a polystyrene, polycarbonate, polymethyl methacrylate, polyvinyl chloride or PETG.

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