LIGHT EMITTING DEVICE COMPRISING A BASE STRUCTURE

Abstract

A light emitting device comprising a housing, a carrier configured to be fixed to the housing, a light module disposed on the carrier and comprising a plurality of light sources, at least one accessory, and a base structure comprising a central base portion and a peripheral base portion connected to said central base portion. The central base portion is configured to be fixed to the carrier and / or to the housing, and the peripheral base portion is configured to be fixed to the at least one accessory. FIG. 1B

Description

FIELDOFINVENTION The present invention relates to a for fixing accessories thereto, and to the use of such a base structure in such a light emitting device. BACKGROUND Luminaires, in particular outdoor luminaires, are often designed for a particular purpose and / or for a specific customer, andmany different luminaires have to be kept in stock for different applications. In the commonly used outdoor luminaires, a light emitting device is usually manufactured by assembling different components which are often inconvenient to unmount from each other for the purpose of maintenance or replacement. Indeed, often light emitting devices are designed with a particular design which is fixed, or which can only be changed to a limited extent. Moreover, conventional light emitting devices, e.g. in outdoor luminaires, offer only a limited range of illumination products. When e.g. a different esthetical effect is desirable, or when e.g. a different light distribution and / or a different glare classification is required, e.g. because of a change in the law or regulations or a customers request, a new light emitting device has to be created each time. Therefore, conventional light emitting devices lack modularity, or have limited modularity. Hence, it is necessary to manufacture light emitting devices for different applications, thereby increasing the manufacturing costs. In addition, a large number of components, e.g. accessories, are needed to address the needs of different customers, withmany different components requiring different molds. SUMMARY An object of embodiments of the invention is to provide a . More in particular, embodiments of the invention aim to provide a for fixing accessories thereto in a convenient and modular way, i.e., to provide a modular light emitting device whose accessories can be replaced directly on site in a convenient way, depending on the site to be illuminated and / or the specific application and / or the customers request. Further, embodiments of the invention provide a use of such a base structure in such a light emitting device. According to a first aspect of the invention, there is provided a light emitting device comprising a housing, a carrier configured to be fixed to the housing, a light module disposed on the carrier and comprising a plurality of light sources, at least one accessory, and a base structure comprising a central base portion and a peripheral base portion connected to said central base portion. The central base portion is configured to be fixed to the carrier and / or to the housing, and the peripheral base portion is configured to be fixed to the at least one accessory. In the context of the invention, it is meant by housing a component of a light emitting device, such as a luminaire head, which may comprise and / or enclose any one or more of the following electrical / electronic components of the light emitting device: a light source driving means, a light source dimming means, surge protection circuitry, electrostatic discharge protection circuitry, a fuse, a metering circuitry, a driving and / or control circuitry for any electrical components of the light module. It is further noted that the housing may, but need not, comprise and / or enclose the above- mentioned carrier, light module, at least one accessory, and base structure of the light emitting device. In some embodiments, the housing may comprise and / or enclose at least one of the above- mentioned components of the light emitting device. In some embodiments, the housingmay comprise at least one wall whereon the carrier is configured to be fixed. The at least one wall may be a plate or a sheet, e.g., a plate or a sheet of metal or other suitable material. In some embodiments, the housing may be a synonym of a foundry of the light emitting device, such as a foundry of a luminaire head. For example, the housing may comprise a heat sink for dissipation of heat from the light emitting device, and the carrier may be configured to be fixed to the heat sink. In some other embodiments, the housingmay be made of a plastic material. By plastic material, it is meant a synthetic material made from a wide range of polymers. In particular, the at least one wall may be a plate or a sheet of a plastic material. In yet some other embodiments, the housing may be made of a composite material comprising some plastic material or any cheap moldable material. In some embodiments, the at least one wallmay be a plate or a sheet ofmetal, and the remainder ofthe housingmay bemade of a plastic material or a composite material. In some embodiments, the housing may comprise a transparent or translucent casing configured to at least partially surround the base structure and the at least one accessory. The transparent or translucent casing may also be configured to at least partially surround the carrier and the light module. In some embodiments, the above-mentioned at least one wall and the transparent or translucent casing of the housing may together enclose the above-mentioned carrier, light module, at least one accessory, and base structure of the light emitting device. In some embodiments, the at least one wall and the transparent or translucent casing of the housing may together enclose at least one of the above-mentioned electrical / electronic components of the light emitting device. In some embodiments, the housing may further comprise a cover, such as an upper cover. At least one of the above-mentioned electrical / electronic components of the light emitting device may be arranged between the carrier and the cover. The above-mentioned at least one wall of the housing, e.g. the heat sink, the carrier, and the cover of the housing may together enclose at least one of the above-mentioned electrical / electronic components of the light emitting device. In the context of the invention, it is meant by carrier a component of a light emitting device, such as a luminaire head, which may carry or support a light module, and which is fixed to the housing. In some embodiments, the carriermay comprise a printed circuit board, PCB, whereon the plurality oflight sourcesmay be arranged in awayknown to aperson skilled in the art. In some embodiments, the plurality of light sources may comprise light emitting diodes, LEDs. In some embodiments, the carrier may comprise a gear plate. The gear plate may be substantially at, e.g., a substantially at sheet of metal or other suitable material. A PCB may be arranged on the gear plate. A surface area of the gear plate may be larger than a surface area ofthe PCB, ormay be substantially the same, i.e., a portion of the gear plate may or may not surround the PCB. In some embodiments, the gear plate may be configured to be fixed to the heat sink, and the central base portion may be configured to be fixed to the gear plate. In other embodiments, the central base portion may be configured to be fixed to the housing, e.g. to the heat sink or to another portion or wall ofthe housing. In yet otherembodiments, the central base portionmay be configured to be fixed to the carrier, e.g. to the gear plate, and to the housing, e.g. to the heat sink. In the context of the invention, it is meant by light module a component of a light emitting device, such as a luminaire head, which is disposed on the carrier and comprises at least said plurality of light sources. In some embodiments, the plurality of light sources may be arranged on the carrier. Forexample, the carriermay comprise aPCB whereon the plurality oflight sourcesmay be arranged. In some embodiments, the light module may further comprise an optical plate comprising one or more optical elements covering the plurality of light sources. In said embodiments, the central base portionmay be disposed on and / ormay surround the optical plate. The one ormore optical elements may be aligned into a plurality of rows and columns to form a two-dimensional array. In some embodiments, the optical plate may correspond to a lens plate comprising one or more lenses covering the plurality of light sources. In the context of the invention, a lens may include any transmissive optical element that focuses or disperses light by means of refraction. It may also include any one of the following: a reective portion, a backlightportion, aprismatic portion, acollimator portion, a diffusor portion. Forexample, a lens may have a lens portion with a concave or convex surface facing a light source, or more generally a lens portion with a at or curved surface facing the light source, and optionally a collimator portion integrally formed with said lens portion, said collimator portion being configured for collimating light transmitted through said lens portion and having e.g. the shape of a truncated cone. Also, a lens may be provided with a reective portion or surface, referred to as a backlight element in the context of the invention, or with a diffusive portion. It should be clear to the skilled person that other optical plates comprising one or more optical elements different from lenses may be envisaged in other embodiments, such as one or more reectors, e.g. reectors having a shape of a truncated cone. In some embodiments, the lightmodulemay not comprise the above-mentioned optical plate. In said embodiments, the central base portion may be disposed on the carrier and / or may surround the plurality of light sources. For example, the carrier may comprise a PCB whereon the plurality of light sources may be arranged, and the central base portion may be disposed on the carrier, e.g. on the PCB, and / or may surround the plurality of light sources. In an embodiment wherein the carrier comprises a gear plate, the central base portion may be disposed on the gear plate and / or may surround the plurality of light sources. In the context of the invention, it is meant by accessory a component of a light emitting device, such as a luminaire head, which is configured to be fixed to the peripheral base portion of the base structure, and which may interact with light emitted from the light module so as to modify at least one of the following properties of said light: an intensity, a light distribution, a color or color temperature. In some embodiments, the at least one accessory may have an esthetical effect. In some embodiments, the at least one accessory may comprise any one of the following: a skirt, a diffuser, a color filter, a mask plate, a louver, such as a backlight louver, or a combination thereof. In some embodiments, the skirt and / or the diffuser and / or the mask plate may interact with light emitted from the light module so as to modify a light distribution thereof, by e.g. narrowing or enlarging a light beam of said light and / or by blocking light rays emitted from the light module at particular emission angles with respect to the horizontal, e.g. at large emission angles below the horizontal, which may otherwise result in glare that would cause discomfort. In some examples, the skirt may further create shadow areas projected on a surface, such as a wall or a ground surface, by e.g. comprising a geometrical pattern, regular or irregular. In some other examples, the skirtmay be made of a plain sheet, i.e.,may notcomprise any geometrical pattern, and thusmay not further create projected shadow areas. In some embodiments, the color filter and / or the diffusermay interact with said light so as to modify an intensity and / or a color or color temperature thereof, by e.g. having a colored surface. The diffuser may diffuse light emitted from the light module by e.g. having a translucent surface. In some embodiments, the louvermay be shaped such that it blocks light rays emitted from the light module in one or more particular directions and / or at particular emission angles with respect to the horizontal. For example, a backlight louver may be shaped such that it blocks light rays emitted by the lightmodule in abackward direction with respect to the light emitting device, e.g. towards a pole or a wall, such as a façade of a building, supporting the light emitting device, and at large emission angles below the horizontal, which may otherwise result in glare that would cause discomfort. A height of the louver may be higher in said one or more particular directions than a height of the louver in the other directions. In the example of a backlight louver, a height of the backlight louver may be higher in said backward direction than a height ofthe backlight louver in the other directions, i.e., the forward and the side directions with respect to the light emitting device. Embodiments of the invention are based inter alia on the insight that a modularity of conventional light emitting devices is inexistent or limited, said light emitting devices being designed with a particular design which is fixed, or which can only be changed to a limited extent. In addition, in conventional light emitting devices a large number of components, e.g. accessories, are needed to address the needs of different customers, withmany different components requiring different molds. Moreover, conventional light emitting devices, e.g. in outdoor luminaires, offer only a limited range of illumination products. Further, when e.g. a different esthetical effect is desirable, a completely new housing has to be created each time. Furthermore, most luminaires cannot be easily upgraded, e.g. with a new accessory, and cannot be easily adapted based on the desired application. If the accessory needs to be changed in order to have a different intensity, light distribution, glare classification, color or color temperature depending on the application (e.g. pedestrian area vs road, highway, crossroad), often the housing of the luminaire has to be changed and / or the components of the luminaire are inconvenient to unmount from each other for replacement of the accessory. In addition, conventional light emitting devices, e.g. in outdoor luminaires, may have different external shapes and / or different internal spaces having different sizes and / or shapes, and / ormayhave different fixation locations and / or different fixations means for fixing an accessory thereto, such that a completely new accessory has to be created each time depending on the above characteristics. By contrast, in the light emitting device of embodiments of the invention, the base structure comprises a central base portion and a peripheral base portion connected to said central base portion. The central base portion is configured to be fixed to the carrier and / or to the housing of the light emitting device, and the peripheralbase portion is configured to be fixed to the at leastone accessory. Thus, by comprising such a base structure, the light emitting device ofembodiments ofthe invention may offer various different light effects and / or light distributions and / or esthetical effects, optionally with a similar global look, without the need for changing other components of the light emitting device, e.g. the housing, when changing one accessory for another, the such that a customer can use a single product family for different environments (e.g. road, park, pedestrian path, highway, etc.). Further, in the light emitting device ofembodiments of the invention, the housing and / or the carrier and / or the light module can be the same for a large range of different accessories thanks to the use of such a base structure in the light emitting device. Thus, the light emitting device can be readily adjusted according to the desire of the customer by selecting the appropriate at least one accessory, and enables the selection of various types of accessories as described above. It is further noted that the housing and / or the carrier and / or the light module of the light emitting device may be molded parts, and that since said partsmaybe the same, the manufacturing costs can be significantly reduced. Furthermore, since an external shape and dimensions of the base structure may be the same or similar, irrespective of the type of accessory that is fixed to the peripheral base portion of the base structure, a manufacturer of the light emitting device need not design and keep in stock different shapes ofcomponents thereoffor different applications and / or for differentpositions ofthe accessory in the light emitting device. Therefore, the light emitting device of embodiments of the invention offers increased modularity compared to conventional light emitting devices, which do not enable a large variety of accessories to be fixed thereto and which do not enable easy replacement of the accessories. Exemplary embodiments relate to a light emitting device for an outdoor luminaire. By outdoor luminaire, it is meant luminaires which are installed on roads, tunnels, industrial plants, stadiums, airports, harbors, rail stations, campuses, parks, cycle paths, pedestrian paths or in pedestrian zones, for example, and which can be used notably for the lighting of an outdoor area, such as roads and residential areas in the public domain, private parking areas, access roads to private building infrastructures, warehouses, industry halls, etc. According to a preferred embodiment, the central base portion may comprise a mesh disposed on the light module and comprising a plurality of parallel mesh rods and at least one connection rod connecting the plurality ofmesh rods. In some embodiments, a first connection rod connecting a first mesh rod to a second mesh rod may not be aligned with a second connection rod connecting the second mesh rod to a third mesh rod, i.e., the first and second connection rods may be disposed in alternance between the first mesh rod and the second mesh rod and between the second mesh rod and the third mesh rod in a similar arrangement as the one of bricks of a wall. Such an arrangement in alternance may offer increased resistance against deformation of the central base portion, in particular against shear stress of the central base portion. In other embodiments, the first connection rod may be aligned with the second connection rod, i.e., may form together with the plurality of mesh rods a grid ofrows and columns in a similar arrangement as the one of a matrix. It should be clear to the skilled person that in yet other embodiments, other mesh shapes may be envisaged. According to an exemplary embodiment wherein the lightmodule further comprises an optical plate having a plurality of optical elements, at least one optical element may be disposed between two adjacent mesh rods and / or one mesh rod may be disposed between two adjacent optical elements and / or the at least one connection rodmay be disposed between two adjacent optical elements. In an example wherein the mesh comprises a plurality ofconnection rods, at leastone optical elementmay be disposed between two adjacent connection rods. It is noted that the mesh need not comprise a mesh rod disposed between each pair ofadjacent columns ofoptical elements. In otherembodiments wherein the lightmodule does notcomprise an optical plate, themeshmay be disposed on the carrier, e.g. on the PCB. At least one light source may be disposed between two adjacent mesh rods and / or one mesh rodmay be disposed between two adjacent light sources and / or the at least one connection rodmay be disposed between two adjacent light sources. In an example wherein the mesh comprises a plurality of connection rods, at least one light source may be disposed between two adjacent connection rods. In this way, the mesh may be configured such that it does not interfere with light emitted from the light module, whether the light module comprises the above-mentioned optical plate or not. In particular, the plurality ofmesh rods and / or the at least one connection rod may be configured such that they do not intersect any light ray emitted from the light module, or at least intersect a minimal amount of such light rays, such that the mesh does not obstruct light emitted from the light module. For example, a height of the plurality ofmesh rods and / or of the at least one connection rod may be substantially smaller than a height ofthe plurality of light sources, and optionally ofthe one ormore optical elements in embodiments wherein the light module further comprises an optical plate. According to a preferred embodiment, the meshmay beprovided with at leasttwo first fixation holes configured to respectively receive at least two first fixation elements for fixing the base structure to the carrier and / or to the housing. Preferably, the at leasttwo first fixation elements comprise any one of the following: screws, locks, clamps, clips, or a combination thereof. According to a preferred embodiment, the at least two first fixation elements may be configured to fix the base structure and the lightmodule to the carrier and / or to the housing. Accordingly, the light module, in particular the optical plate, and / or the PCB may be provided with corresponding holes. In this way, existing fixation elements that are used to fix the light module to the carrier and / or to the housing may also be used to fix the base structure, and in particular the central base portion, to the carrier and / or to the housing, without the need to provide another fixation means for that purpose. For example, the at least two fixation holes provided to the mesh may be aligned with the existing holes that are provided to the light module and to the carrier and / or the housing, without the need to provide the light module and the carrier and / or the housing with other holes for that purpose. According to a preferred embodiment, the at least two first xation holes may be disposed at intersections between a mesh rod and a connection rod. In other embodiments, the at least two first fixation holes may be provided on a mesh rod and / or on a connection rod. According to an exemplaryembodiment wherein the lightmodule further comprises an optical plate, one of the optical plate and the central base portion, e.g. the mesh, may comprise at least two pins, and the other one of the optical plate and the central base portion, e.g. the mesh, may comprise at leasttwo corresponding positioning holes for positioning the lightmodule with respect to the central base portion. In embodiments wherein the carrier comprises a PCB whereon the plurality of light sources may be arranged, one ofthe carrier, e.g. the PCB, and the optical plate may comprise at least two pins, and the other one of the carrier, e.g. the PCB, and the optical plate may comprise at least two corresponding positioning holes for positioning the carrier, e.g., the PCB, with respect to the optical plate. In otherembodiments wherein the lightmodule does not comprise an optical plate, one ofthe carrier, e.g. the PCB, and the central base portion, e.g. the mesh, may comprise at least two pins, and the other one of the carrier, e.g. the PCB, and the mesh may comprise at least two corresponding positioning holes for positioning the carrier with respect to the central base portion. According to a preferred embodiment, the central base portion may comprise a frame disposed around the light module and configured to be fixed to the carrier and / or to the housing. In embodiments wherein the lightmodule comprises an optical plate, the framemay be disposed around the optical plate. In embodiments wherein the carrier comprises a PCB, the frame may be arranged on the PCB. According to apreferredembodimentwherein the central base portion comprises amesh and a frame, the frame may be configured to surround the mesh. In some embodiments, the frame may have a substantially rectangular shape and may comprise four frame rods. The four frame rods may be integrally formed. Other shapes may be envisaged for the frame in other embodiments, such as polygonal (e.g. hexagonal) or elliptical (e.g. circular) shapes. According to a preferred embodiment, the frame may be provided with at least two second fixation holes configured to respectively receive at least two second fixation elements for fixing the base structure to the carrier and / or to the housing. Accordingly, the carrier, e.g. the PCB, may be provided with corresponding holes. Preferably, the at least two second fixation elements comprise any one of the following: screws, locks, clamps, clips, or a combination thereof. In some embodiments, the base structure may comprise a mesh and a frame surrounding the mesh. In other embodiments, the base structuremay only comprise a frame. In otherembodiments wherein the light module does not comprise an optical plate, the frame may surround the plurality of light sources. According to apreferred embodiment, the base structuremay have a first side facing the lightmodule and a second side opposite said first side. The peripheral base portion may have an inner lateral surface between said first side and said second side and facing the central base portion, and an outer lateral surface opposite said inner lateral surface, and the peripheral base portion may be provided with a fixation means configured to fix the at least one accessory to the base structure. According to a preferred embodiment, the peripheral base portionmay be provided with at leasttwo third fixation holes configured to respectively receive at least two third fixation elements for fixing the at least one accessory to the base structure. Said at least two third fixation holes may extend through at least the outer lateral surface, and optionally through the inner lateral surface. In other words, said at least two third fixation holes may correspond to recesses or to through-holes. According to a preferred embodiment, the peripheral base portionmay be provided with at leasttwo protrusions extending from at least one of the inner lateral surface and the outer lateral surface, and with at least two fourth fixation holes configured to respectively receive at least two fourth fixation elements for fixing the at least one accessory to the base structure. Said at least two fourth fixation holesmay at least partially extend in said at leasttwo protrusions from said second side towards said first side of the base structure. In other words, said at least two fourth fixation holes may correspond to recesses or to through-holes. Alternatively, said at least two fourth fixation holes may at least partially extend in said at least two protrusions from said first side towards said second side of the base structure. Preferably, the at least two third fixation elements and / or the at least two fourth fixation elements comprise any one of the following: screws, locks, clamps, clips, or a combination thereof. According to a preferred embodiment, the peripheral base portion may be provided with the above- mentioned at least two third fixation holes and with the above-mentioned at leasttwo fourth fixation holes. A first accessory of the at least one accessory may be provided with at least two holes corresponding to said at least two third fixation holes, and a second accessory of the at least one accessory may be provided with at least two holes corresponding to said at least two fourth fixation holes. In this way, at leasttwo accessories may be fixed to the base structure at the same time. For example, a skirt may be fixed to the base structure by means of the at least two third fixation holes and a diffusermay be fixed to the base structure bymeans ofthe at leasttwo fourth fixation holes. It should be clear to the skilled person that other combinations of accessories may be envisaged. According to a preferred embodiment, the peripheral base portionmay be provided with at leasttwo clips protruding from the outer lateral surface, and the at least one accessory is provided with at least two corresponding slits. In some embodiments, the peripheral base portionmay be provided with the above-mentioned at least two fourth fixation holes and with said at least two clips.A first accessory of the at least one accessory may be provided with at least two holes corresponding to said at least two fourth fixation holes, and a second accessory ofthe at least one accessorymay be provided with said at least two corresponding slits. According to a preferred embodiment, the base structure may further comprise at least two connection legs configured to connect the peripheral base portion to the central base portion. According to a preferred embodiment wherein the peripheral base portion is provided with at least two protrusions, said at least two connection legs may be configured to respectively connect the at least two protrusions to the central base portion. In other embodiments, the connection legs may be shaped and / or arranged differently between the central base portion and the peripheral base portion. In an example, the base structure may comprise at least two connection legs, each connecting a respective end of a mesh rod to the inner lateral surface of the peripheral base portion. In another example, the base structure may comprise at least two connection legs, each configured to connect the inner lateral surface of the peripheral base portion to the central base portion at locations other than the location of a protrusion, e.g. at either side of a protrusion. According to a preferred embodiment, the light emitting device may further comprise at least one rod, preferably hollow, extending through the base structure between the central base portion and the peripheral base portion. In some embodiments, the at least one hollow rod may be configured to accommodate at least one electrical cable for feeding any one ormore ofthe above-mentioned electrical / electronic components of the light emitting device. For this first purpose, the at least one hollow rodmay be made of a rigid or a exible material, e.g. plastic. Said electrical / electronic components of the light emitting device may be arranged in a gear box. Said gear box may, alone or together with a cover ofthe housing (see above), enclose said electrical / electronic components of the light emitting device. In some embodiments, the at least one hollow rod may also be configured to increase a rigidity of the light emitting device. For this second purpose, the at least one hollow rodmay bemade ofa rigid material, e.g. plastic or metal, such as aluminum or steel. According to a preferred embodiment wherein the base structure further comprises at least two connection legs, the at least one rod may extend between two adjacent connection legs of said at least two connection legs. According to a preferred embodiment, the central base portion may have a substantially rectangular shape. It should be clear to the skilled person that other shapes are possible, depending on the configuration and arrangement of the light module, in particular the presence or not of an optical plate and the number, configuration, and arrangement of the light sources, and depending on the configuration and arrangement ofthe carrier, in particular the presence or notofaPCB. For example, circular or elliptical shapes may be envisaged for the central base portion. According to a preferred embodiment, the peripheral base portion may have a substantially cylindrical shape. It should be clear to the skilled person that other shapes are possible, depending on the configuration and arrangement of the at least one accessory, and depending on the configuration and arrangement of the housing, in particular of the transparent or translucent casing. For example, square or rectangular shapes may be envisaged for the peripheral base portion. According to apreferred embodiment, a height ofthe central base portionmay be comprised between 1 mm and 5 mm, preferably between 2 mm and 4 mm. According to a preferred embodiment, a height of the peripheral base portion may be comprised between 5 mm and 25 mm, preferably between 10mm and 20 mm. According to a preferred embodiment, a material of the base structure may comprise plastic. Other materials may be envisaged, such as metal, e.g. aluminum or steel. According to a preferred embodiment, the central base portion and the peripheral base portion may be integrally formed. In other embodiments, the peripheral base portionmay be formed in one piece, and the central base portion and the at least two connection legs may be formed in another piece. In yet other embodiments, the at least two connection legs may be formed in yet another piece distinct from the central base portion and from the peripheral base portion. According to a preferred embodiment, the base structure may further comprise at least two reinforcement members extending between the central base portion and the peripheral base portion. Each of the at least two reinforcement members may comprise two reinforcement legs extending between the central base portion and the peripheral base portion, in particular between the mesh, e.g. a mesh rod, and the peripheral base portion, e.g. a protrusion. In embodiments wherein the light module comprises an optical plate, at least one optical element of the one or more optical elements may be disposed between the two reinforcement legs ofeach of the at least two reinforcement members. The two reinforcement legs of each of the at least two reinforcement members may be disposed on the optical plate. In other embodiments wherein the light module does not comprise an optical plate, the two reinforcement legs of each of the at least two reinforcement members may be disposed on the carrier, e.g. on the PCB, and at least one light sourcemay be disposed between the two reinforcement legs ofeach ofthe at leasttwo reinforcement members. According to a preferred embodiment wherein the central base portion comprises a mesh, the mesh may comprise a plurality of reective barriers configured to reect light rays, preferably having an incident angle with respect to an axis perpendicular to the light module between a predetermined angle between 60° and 85°, and 90°, emitted through one or more light sources of said plurality of light sources, preferably with a reection angle with respect to said axis smaller than 60°. According to an embodiment wherein the light module comprises an optical plate having a plurality of optical elements, the plurality of optical elements may be aligned into a plurality of rows and columns to form a two-dimensional array. The at least one connection rod may form together with the at least two mesh rods of the mesh a two-dimensional array of rows and columns in a similar arrangement as the one of the plurality of optical elements. The mesh may comprise a mesh rod disposed between each pair of adjacent columns of optical elements, and a connection rod disposed between each pair of adjacent rows of optical elements. Preferably, the plurality ofreective barriers is disposed on the plurality ofmesh rods and / or on the at least one connection rod, e.g. by means of a plurality of clips or by means of a sliding mechanism. For example, the plurality ofreective barriers may each be provided with a groove or channel, and the plurality of mesh rods and / or the at least one connection rod may be provided with a corresponding protrusion such that the plurality ofreective barriers may be slid with respect to the plurality ofmesh rods and / or the at least one connection rod and fixed thereto, or vice versa. According to a preferred embodiment wherein the central base portion comprises a frame, the frame may comprise a plurality of reective barriers configured to reect light rays, preferably having an incident angle with respect to an axis perpendicular to the light module between a predetermined angle between 60° and 85°, and 90°, emitted through one or more light sources of said plurality of light sources, preferably with a reection angle with respect to said axis smaller than 60°. Preferably, the plurality of reective barriers is disposed on the frame by means of a plurality of clips or by means of a sliding mechanism as described above. In embodiments wherein the plurality of reective barriers are configured as backlight elements, each reective barriermay be disposed on one side of a corresponding optical element, between two adjacent rows of optical elements. In other embodiments, the plurality of reective barriers may be configured as reective elements having a shape, configuration, and arrangement different from backlight elements, as described in details in PCT publicationWO 2020 / 058282 A1 in the name of the applicant, which is herein included by reference in its entirety. For example, the plurality of reective barriers may be configured as a light shielding structure configured to cut off or reect light rays having a large incident angle, i.e., as G-limiters, thereby reducing the light intensities at large angles and improving the G / G* classification of the light emitting device. In such embodiments, the plurality ofreective barriers may be arranged between two adjacent columns of optical elements. Preferably, the plurality ofreective barriers and the plurality ofmesh rods and / or the at least one connection rod are integrally formed. According to a second aspect of the invention, there is provided a use of a base structure according to any one of the above-described embodiments ofthe first aspect ofthe invention in a light emitting device according to any one of the above-described embodiments of said first aspect. The skilled person will understand that the hereinabove described technical considerations and advantages for the light emitting device embodiments of the first aspect also apply to the corresponding use embodiments of the second aspect, mutatis mutandis. BRIEFDESCRIPTIONOFTHEFIGURES This and other aspects of the present invention will now be described in more detail, with reference to the appended drawings showing a currently preferred embodiment ofthe invention. Like numbers refer to like features throughout the drawings. Figures 1A-1C respectively illustrate a perspective bottom view, a cross-sectional perspective bottom view, and a cross-sectional side view of a light emitting device according to an exemplary embodiment; Figures 2A-2D respectively illustrate bottom views of a light module and a base structure of a light emitting device according to several exemplary embodiments; Figures 3A and 3B respectively illustrate a cross-sectional side view and a cross-sectional perspective bottom view of a light module and a base structure of a light emitting device according to an exemplary embodiment; Figures 4A-4E respectively illustrate perspective views of a base structure and an accessory of a light emitting device according to several exemplary embodiments; Figures 5A and 5B respectively illustrate cross-sectional side views of a base structure and an accessory of a light emitting device according to two different exemplary embodiments; Figures 6A-6C respectively illustrate perspective views of a base structure of a light emitting device according to two different exemplary embodiments, and perspective views of a base structure and an accessory of a light emitting device according to several exemplary embodiments; and Figures 7A and 7B respectively illustrate a bottom view of a light module and a base structure and a perspective bottom view of a light emitting device according to an exemplary embodiment. DESCRIPTIONOFTHEEMBODIMENTS Figures 1A-1C respectively illustrate a perspective bottom view, a cross-sectional perspective bottom view, and a cross-sectional side view of a light emitting device according to an exemplary embodiment. As illustrated in Figures 1A-1C, a light emitting device 1, such as a luminaire head, comprises a housing 100, a carrier200 configured to be fixed to the housing 100, a lightmodule 300 disposed on the carrier 200 and comprising a plurality of light sources (not shown), at least one accessory (not shown; see element 400 in Figures 4A-4D, 5A-5E, 6A-6B, and 7C) and a base structure 500 comprising a central base portion 510 and a peripheral base portion 520 connected to said central base portion 510. The central base portion 510 is configured to be fixed to the carrier 200 and / or to the housing 100, and the peripheral base portion 520 is configured to be fixed to the at least one accessory. In the embodiment of Figures 1A-1C, the light module 300 is configured to emit light downwardly, e.g. towards the ground or a façade surface. In other embodiments, the light module 300 may be configured to emit light upwardly, e.g. towards a ceiling or façade surface or the sky. In the embodiment ofFigures 1A-1C, the housing 100 comprises a heat sink 120, and the carrier 200 comprises a printed circuit board, PCB 210 and a gear plate 220 whereon the PCB 210 is disposed. The gear plate 220 of the carrier 200 is configured to be fixed to the heat sink 120 of the housing 100. The central base portion 510 is configured to be fixed to the gear plate 220 of the carrier 200. In other embodiments, the central base portion 510 may be configured to be fixed to the housing 100, e.g. to the heat sink 120 or to another portion or wall of the housing 100. In yet other embodiments, the central base portion 510may be configured to be fixed both to the carrier 200, e.g. to the gear plate 220, and to the housing 100, e.g. to the heat sink 120. In the embodiment ofFigures 1A-1C, the housing 100 comprises a transparent or translucent casing 110 configured to at least partially surround the base structure 500 and the at least one accessory. A top edge ofthe transparent or translucent casing 110 is configured to be fixed to at least one wall of the housing 100, e.g. to the heat sink 120, and to at least partially surround the carrier 200 and the light module 300. The carrier 200, e.g. the gear plate 220, is configured to be disposed on said at least one wall of the housing 100, such that said at least one wall is arranged between the gear plate 220 and the transparent or translucent casing 110, in particular the top edge thereof. Thus, said at least one wall of the housing 100, the carrier 200, e.g. the gear plate 220, and the transparent or translucent casing 110 of the housing 100, together define a first enclosure configured to enclose the light module 300, the at least one accessory, and the base structure 500. In the embodiment of Figures 1A-1C, the light module 300 further comprises an optical plate 310 comprising one ormore optical elements 311 covering the plurality oflight sources. The central base portion 510 is disposed on the optical plate 310. In other embodiments, such as the embodiment of Figure 2C, the carrier 200 may comprise a PCB 210 whereon the plurality of light sources may be arranged, and the central base portion 510 may also be disposed on the PCB 210 and may surround the optical plate 310. In yet other embodiments, the light module 300 may not comprise an optical plate 310, and the central base portion 510 may be disposed on the carrier 200, e.g. on the PCB 210, and / or may surround the plurality of light sources. As illustrated in Figures 1A-1C, the light emitting device 1 may further comprise at least one rod 600, preferably hollow, extending through the base structure 500 between the central base portion 510 and the peripheral base portion 520 (see also Figure 7B). The transparent or translucent casing 110 may be configured to enclose the at least one rod 600. The at least one hollow rod 600 may be configured to accommodate at least one electrical cable for feeding any one ormore ofthe following electrical / electronic components of the light emitting device 1: a light source driving means, a light source dimming means, surge protection circuitry, electrostatic discharge protection circuitry, a fuse, a metering circuitry, a driving and / or control circuitry for any electrical components of the light module 300. The housing 100 may further comprise a cover 130, such as an upper cover 130 as illustrated in Figures 1A-1C, which may be removably attached to the remainder of the housing 100 by means of e.g. a plurality of hinges, e.g. three hinges Hi as illustrated in Figures 1A-1C. At least one of the above-mentioned electrical / electronic components of the light emitting device 1 may be arranged between the carrier 200, e.g. the gear plate 220, and the cover 130. The above-mentioned at least one wall of the housing 100, e.g. the heat sink 120, the carrier 200, e.g. the gear plate 220, and the cover 130 of the housing 100 may together enclose at least one of the above-mentioned electrical / electronic components, so as to define a second enclosure of the housing 100 distinct from the above-mentioned first enclosure defined by the at least one wall of the housing 100, the carrier 200, e.g. the gear plate 220, and the transparent or translucent casing 110. As illustrated in Figures 1A-1C, the central base portion 510 may have a substantially rectangular shape. It should be clear to the skilled person that other shapes are possible, depending on the configuration and arrangement ofthe lightmodule 300, in particular the presence or not ofan optical plate 310 and the number, configuration, and arrangement of the light sources, and depending on the configuration and arrangement ofthe carrier 200, in particular the presence or not of aPCB 210. For example, circular or elliptical shapes may be envisaged for the central base portion 510. As illustrated in Figures 1A-1C, the peripheral base portion 520may have a substantially cylindrical shape. It should be clear to the skilled person that other shapes are possible, depending on the configuration and arrangement ofthe at least one accessory, and depending on the configuration and arrangement of the housing 100, in particular of the transparent or translucent casing 110. For example, square or rectangular shapes may be envisaged for the peripheral base portion 520. Figures 2A-2D respectively illustrate bottom views of a light module and a base structure of a light emitting device according to several exemplary embodiments. As illustrated in Figures 2A-2D, the light module 300 may further comprise an optical plate 310 comprising a plurality of optical elements 311 covering the plurality of light sources. The central base portion 510may be disposed on and / ormay surround the optical plate 310, as will be described in further details in the following. The carrier200may comprise aPCB 210 (see Figures 2C and 2D) whereon the plurality of light sources may be arranged. The carrier 200 may comprise a gear plate (not shown; see element 220 in Figures 1A-1C). The plurality of light sources may comprise LEDs. In the embodiment ofFigure 2A, the light emitting device 1 comprises 25 light sources arranged on the carrier 200, whichmay comprise aPCB whereon the 25 light sources are arranged. Accordingly, the optical plate 310 comprises 25 optical elements 311, such as lenses 311 as illustrated in Figures 2A-2D, each optical element 311 covering one light source. It is noted that instead ofproviding one optical plate 310 with 25 optical elements 311, it is also possible to provide a plurality of optical plates with fewer optical elements. Each light source may comprise one LED or may comprise several LEDs. The 25 optical elements 311 are aligned into 5 rows and 5 columns (5 x 5) to form a two-dimensional array of optical elements 311. However, it should be clear for the skilled person that the number of light sources and / or the number of optical elements 311 may vary in other embodiments. It should also be clear for the skilled person that other arrangements of optical elements 311 may be envisaged in other embodiments. In a first exemplary embodiment, the optical plate 310may comprise 4 optical elements 311 aligned into 2rows and 2 columns (2 x 2). In a second exemplary embodiment, the optical plate 310 may comprise 6 optical elements 311 aligned into 2 rows and 3 columns (2 x 3), or 3 rows and 2 columns (3 x 2). In a third exemplary embodiment, the optical plate 311 may comprise 9 optical elements 311 aligned into 3 rows and 3 columns (3 x 3). In the embodiments of Figures 2B-2D, the optical plate 311 may comprise 20 optical elements 311 aligned into 5 rows and 4 columns (5 x 4). Many other embodiments may be envisaged, such as (2 x 4), (3 x 4) arrangements of optical elements 311, etc. In yet other embodiments, the optical plate 310 may comprise more than 25 optical elements 311. Although a lens plate 310 comprising a plurality oflens elements 311 is illustrated in the embodiments ofFigures 2A-2D, it should be clear to the skilled person that other optical plates comprising a plurality ofoptical elements differentfrom lensesmay be envisaged in otherembodiments, such as a plurality ofreectors, e.g. reectors having a shape of a truncated cone. In the embodiments of Figures 2A and 2C, the plurality of lenses 311 are non-rotational symmetric lenses 311 comprising a symmetry plane substantially perpendicular to a at portion ofthe lens plate 310. In the embodiments ofFigures 2B and 2D, the plurality of lenses 311 are rotational symmetric lenses 311. It should be clear to the skilled person that other shapes of lenses may be envisaged for each of the embodiments ofFigures 2A-2D, e.g. rotational symmetric lenses in the embodiments of Figures 2A and 2C and non-rotational symmetric lenses in the embodiments of Figures 2B and 2D. In other embodiments, the plurality oflenses may be free-form lenses. As illustrated in Figures 2A-2D, the central base portion 510 may comprise a mesh 511 disposed on the light module 300 and comprising a plurality of parallel mesh rods 5111 and at least one connection rod 5112 connecting the plurality ofmesh rods 5111. In the embodiments ofFigures 2A- 2D, the mesh 511 comprises three parallel mesh rods 5111 and four connection rods 5112. Two first connection rods 5112 connect the first (left) mesh rod 5111 to the second (central) mesh rod 5111, andtwo second connections rods 5112 connect the second (central) meshrod 5111 to the third (right) mesh rod 5111. The two first connection rods 5112 are not aligned with the two second connection rods 5112, i.e., are disposed in alternance between the first (left) mesh rod 5111 and the second (central) mesh rod 5111 and between the second (central) mesh rod 5111 and the third (right) mesh rod 5111 in a similar arrangement as the one of bricks of a wall. In other embodiments, the two first connection rods 5112 may be aligned with the two second connection rods 5112, i.e., may form together with the mesh rods 5111 a grid ofrows and columns in a similar arrangement as the one of a matrix. It should be clear to the skilled person that in other embodiments, other shapes may be envisaged for the mesh 511. In yet other embodiments, the mesh 511 may comprise more or less than three parallel mesh rods 5111 and / or more or less than four connection rods 5112. In an example, the mesh 511 may comprise two parallel mesh rods 5111 and one connection rod 5112 connecting the two mesh rods 5111, i.e., may have an H-shape, which may constitute the smallest mesh that may be envisaged in embodiments of the invention. In another example, the mesh 511 may comprise three parallel mesh rods 5111 and two connection rods 5112 connecting the three mesh rods 5111 and being arranged in alternance or aligned (see above). In yet another example, the mesh 511 may comprise four or more parallel mesh rods 5111 and six or more connection rods 5112 connecting the four ormore mesh rods 5111 and being arranged in alternance or aligned (see above). As illustrated in Figures 2A-2D, at least one optical element 311 may be disposed between two adjacentmesh rods 5111 and at least one optical element 311 may be disposed between two adjacent connection rods 5112. In the embodiments of Figures 2A-2D, one optical element 311 is disposed between two adjacent mesh rods 5111 and two optical elements 311 are disposed between two adjacent connection rods 5112. In other embodiments, two optical elements 311 may be disposed between two adjacentmesh rods 5111 and / or one optical element 311 may be disposed between two adjacent connection rods 5112. It is noted that the mesh 511 need not comprise a mesh rod 5111 disposed between each pair of adjacent columns of optical elements 311, as illustrated in Figure 2A wherein nomesh rod 5111 is disposed between the firstand second columns ofoptical elements 311. In other embodiments, the light module 300 may not comprise an optical plate 310, and the central base portion 510 may be disposed on the carrier 200, e.g. on a PCB 210 whereon the plurality of light sources may be arranged, and / or may surround the plurality of light sources. In such embodiments, the mesh 511 may be disposed on the carrier 200, e.g. on the PCB 210. At least one light sourcemay be disposed betweentwo adjacentmesh rods 5111 and at least one light sourcemay be disposed between two adjacent connection rods 5112. As illustrated in Figures 2A-2D, the mesh 511 may be provided with at least two first fixation holes H1 configured to respectively receive at least two first fixation elements (not shown) for fixing the base structure 500 to the carrier 200 and / or to the housing 100. Preferably, the at least two first fixation elements may comprise any one of the following: screws as in the embodiments ofFigures 2A-2D, locks, clamps, clips, or a combination thereof. The at least two first fixation elements may be configured to fix the base structure 500 and the light module 300 to the carrier 200 (not shown in Figures 2A and 2B) and / or to the housing (not shown; see element 100 in Figures 1A-1C). Accordingly, the light module 300, in particular the optical plate 310, and the PCB 210 may be provided with corresponding holes. The at least two first fixation holes H1 may be disposed at intersections between amesh rod 5111 and a connection rod 5112. In other embodiments, the at least two first fixation holes H1 may be provided on amesh rod 5111 and / or on a connection rod 5112. In the embodiments of Figures 2A-2D, the mesh 511 is provided with two first fixation holes H1 configured to respectively receive two first fixation elements, such as two first screws (not shown). In other embodiments, the mesh 511 may be provided with more or less than two first fixation holes H1 configured to respectively receive more or less than two first fixation elements. As illustrated in Figure 2C, the central base portion 510 may comprise a frame 512 disposed around the light module 300 and configured to be fixed to the carrier 200 and / or to the housing 100. The frame 512 may be configured to surround the mesh 511. The frame 512 may be provided with at least two second fixation holes H2 configured to respectively receive at least two second fixation elements (not shown) for fixing the base structure 500 to the carrier 200 and / or to the housing 100. Preferably, the at least two second fixation elements may comprise any one of the following: screws as in the embodiment ofFigure 2C, locks, clamps, clips, or a combination thereof. In the embodiment ofFigure 2C, the frame 512 has a substantially rectangular shape and comprises four frame rods 5121. The four frame rods 5121 may be integrally formed. Other shapes may be envisaged for the frame 512 in other embodiments, such as polygonal (e.g. hexagonal) or elliptical (e.g. circular) shapes. The frame 512 is disposed around the optical plate 310. The carrier 200 comprises a PCB 210 whereon the plurality of light sources may be arranged, and a gear plate (not shown; see element 220 in Figures 1A-1C). The frame 512 is arranged on the PCB 210. The frame 512 is configured to be fixed to the carrier 200, e.g. to the gear plate 220, and / or to the housing 100. The frame 512 is configured to surround the mesh 511 and the optical plate 310. The frame 512 is provided with two second fixation holes H2 configured to respectively receive two second fixation elements, such as two second screws (not shown). Accordingly, the PCB 210 is provided with two corresponding holes. The two second fixation holes H2 are provided on two respective frame rods 5121 ofthe four frame rods 5121. In the embodiment of Figure 2C, the base structure 500 comprises a mesh 511 and a frame 512 surrounding the mesh 511. In other embodiments, the base structure 500 may only comprise a frame 512. In other embodiments wherein the lightmodule 300 does not comprise an optical plate 310, the frame 512 may surround the plurality of light sources. As illustrated in Figures 2A-2D, the base structure 500 may have a first side 501 facing the light module 300 and a second side 502 opposite said first side 501. The peripheral base portion 520 may have an inner lateral surface S1 between said first side 501 and said second side 502 and facing the central base portion 510, and an outer lateral surface S2 opposite said inner lateral surface S1. The peripheral base portion 520 may be provided with a fixation means H3, H4 configured to fix the at least one accessory (not shown; see element 400 in Figures 4A-4D, 5A-5E, 6A-6B, and 7C) to the base structure 500, as will be described in more details in the following. As illustrated in Figures 2A-2D, the peripheral base portion 520 may be provided with at least two third fixation holes H3 configured to respectively receive at least two third fixation elements (not shown) for fixing the at least one accessory to the base structure 500. Said at leasttwo third fixation holes H3 may extend through at least the outer lateral surface S2, and optionally through the inner lateral surface S1. In other words, said at leasttwo third fixation holesH3maycorrespond to recesses or to through-holes. The at least two third fixation elements may comprise any one of the following: screws as in the embodiments ofFigures 2A-2D, locks, clamps, clips, or a combination thereof. In the embodiments of Figures 2A-2C, the peripheral base portion 520 is provided with six third fixation holes H3, whichmay be disposed symmetrically with respect to a center ofthe base structure 500, i.e., at an angle of60° between two adjacent third fixation holes H3 with respect to said center. Three ofthe six third fixation holesH3 may be provided with a metal insert, and the remaining three third fixation holes H3 may be simple recesses or through-holes, i.e., without metal insert. In other embodiments, all third fixation holes H3 may be provided with a metal insert, or none of them. It should be clear to the skilled person that in other embodiments, the peripheral base portion 520may be provided with more or less than six third fixation holes H3, arranged symmetrically or not with respect to said center. For example, in the embodiment ofFigure 2D, the peripheral base portion 520 is provided with two third fixation holes H3, arranged diametrically opposed to each other with respect to said center. As illustrated in Figures 2A-2D, the peripheral base portion 520 may be provided with at least two protrusions 521 extending from the inner lateral surface S1, and with at least two fourth fixation holes H4 configured to respectively receive at least two fourth fixation elements (not shown) for fixing the at least one accessory 400 to the base structure 500. Said at leasttwo fourth fixation holes H4 may at least partially extend in said at least two protrusions 521 from said second side 502 towards said first side 501 of the base structure 500. In other words, said at least two fourth fixation holes H4 may correspond to recesses or to through-holes. The at least two fourth fixation elements may comprise any one of the following: screws as in the embodiments of Figures 2A-2D, locks, clamps, clips, or a combination thereof. In the embodiments of Figures 2A-2C, the peripheral base portion 520 is provided with six protrusions 521, and with six fourth fixation holes H4, which may be disposed symmetrically with respect to a center of the base structure 500, i.e., at an angle of 60° between two adjacent fourth fixation holes H4 with respect to said center. The six fourth fixation holes H4 may be provided in alternance with the six third fixation holes H3. In other words, every 30° from said center, there is provided on the peripheral base portion 520 either a third fixation hole H3 or a fourth fixation hole H4, in alternance. Three ofthe six fourth fixation holes H4may be provided with a metal insert, and the remaining three fourth fixation holes H4 may be simple recesses or through-holes, i.e., without metal insert. In other embodiments, all fourth fixation holesH4may be provided with a metal insert, or none of them. It should be clear to the skilled person that in other embodiments, the peripheral base portion 520may be provided with more or less than six protrusions 521 and six fourth fixation holes H4, arranged symmetrically or not with respect to said center. For example, in the embodiment of Figure 2D, the peripheral base portion 520 is provided with two protrusions 521, and with two fourth fixation holes H4, arranged diametrically opposed to each other with respect to said center. The two fourth fixation holesH4 are arranged in alternance with the two third fixation holes H3, i.e., there is an angle of90° with respect to said center from a third fixation hole H3 to a fourth fixation hole H4. As illustrated in Figures 2A-2D, the base structure 500may further comprise at leasttwo connection legs 530 configured to connect the peripheral base portion 520 to the central base portion 510. Said at least two connection legs 530 may be configured to respectively connect the at least two protrusions 521 to the central base portion 510. In the embodiments of Figures 2A-2C, the base structure 500 comprises four connection legs 530, each connecting two adjacent mesh rods 5111 to a protrusion 521. A first connection leg 530 connects one end ofthe first (left) mesh rod 5111 and one end ofthe second (central) mesh rod 5111 to a first protrusion 521. A second connection leg 530 connects the one end of the second (central) mesh rod 5111 and one end of the third (right) mesh rod 5111 to a second protrusion 521. A third connection leg 530 connects another end of the first (left) mesh rod 5111 and another end of the second (central) mesh rod 5111 to a third protrusion 521. A fourth connection leg 530 connects the other end of the second (central) mesh rod 5111 and another end of the third (right) mesh rod 5111 to a fourth protrusion 521. In other embodiments, the connection legs 530 may be shaped and / or arranged differently between the central base portion 510 and the peripheral base portion 520. For example, in the embodiment of Figure 2D, the base structure 500 comprises two connection legs 530, each connecting a respective end ofthe second (central) mesh rod 5111 to a protrusion 521, and further comprises four connection legs 530, each connecting a respective end of the first (left) mesh rod 5111 or a respective end of the third (right) mesh rod 5111 to the inner lateral surface S1 of the peripheral base portion 520. In embodiments wherein the light emitting device 1 further comprises at least one rod (not shown; see element 600 in Figures 1A-1C and 7B), preferably hollow, extending through the base structure 500 between the central base portion 510 and the peripheral base portion 520, as illustrated in Figure 7B, the at least one rod 600 may extend between two adjacent connection legs of said at least two connection legs 530. In the embodiments of Figures 2A-2C, the at least one rod 600 may extend between the above-mentioned first and second connection legs 530, orbetween the above-mentioned third and fourth connection legs 530. As illustrated in Figure 7B, a firstrod 600may extend between the above-mentioned first and secondconnection legs 530, and a second rod600may extendbetween the above-mentioned third and fourth connection legs 530. As illustrated in Figures 2A-2D, the central base portion 510 may have a substantially rectangular shape. It should be clear to the skilled person that other shapes are possible, depending on the configuration and arrangement ofthe lightmodule 300, in particular the presence or not ofan optical plate 310 and the number, configuration, and arrangement of the light sources, and depending on the configuration and arrangement ofthe carrier 200, in particular the presence or not of aPCB 210. For example, circular or elliptical shapes may be envisaged for the central base portion 510. As illustrated in Figures 2A-2D, the peripheral base portion 520may have a substantially cylindrical shape. It should be clear to the skilled person that other shapes are possible, depending on the configuration and arrangement ofthe at least one accessory, and depending on the configuration and arrangement of the housing, in particular of the transparent or translucent casing (Figures 1A-1C). For example, square or rectangular shapes may be envisaged for the peripheral base portion 520. In the embodiments of Figures 2A-2D, a height of the central base portion 510 may be comprised between 1 mm and 5 mm, preferably between 2 mm and 4 mm. A height of the peripheral base portion 520 may be comprised between 5mm and 25 mm, preferably between 10mm and 20 mm. In the embodiment of Figure 2B, a thickness of the peripheral base portion 520 may be larger than in the embodiments of Figures 2A and 2C-2D. A material of the base structure 500 may comprise plastic. Other materials may be envisaged, such as metal, e.g. aluminum or steel. The central base portion 510 and the peripheral base portion 520 may be integrally formed. In other embodiments, the peripheral base portion 520may be formed in one piece, and the central base portion 510 and the at least two connection legs 530 may be formed in another piece. In yet other embodiments, the at least two connection legs 530 may be formed in yet another piece distinct from the central base portion 510 and from the peripheral base portion 520. The light module 300 and the base structure 500 in the embodiment of Figure 2A correspond to the light module 300 and the base structure 500 in the embodiment of Figures 1A-1C, and thus the description ofthe embodiment ofFigures 1A-1C applies to the embodiment ofFigure 2A. As illustrated in Figure 2B, the base structure 500 may further comprise at least two reinforcement members 540 extending between the central base portion 510 and the peripheral base portion 520. Each of the at least two reinforcement members 540 may comprise two reinforcement legs 5401 extending between the mesh 511, e.g. amesh rod 5111 as illustrated in Figure 2B, and the peripheral base portion 520, e.g. a protrusion 521 as illustrated in Figure 2B. In the embodiment ofFigure 2B, two reinforcement legs 5401 of a first reinforcement member 540 extend between the first (left) mesh rod 5111 and a fifth protrusion 521, and two reinforcement legs 5401 of a second reinforcement member 540 extend between the third (right) mesh rod 5111 and a sixth protrusion 521, said fifth and sixth protrusions 521 being different from the above-mentioned first to fourth protrusions 521. At least one optical element 311 may be disposed between the two reinforcement legs 5401 ofeach ofthe two reinforcementmembers 540. The two reinforcement legs 5401 of each of the two reinforcement members 540 may be disposed on the optical plate 310. In other embodiments wherein the light module 300 does not comprise an optical plate 310, the two reinforcement legs 5401 of each of the two reinforcement members 540 may be disposed on the carrier 200, e.g. on the PCB 210, and at least one light source may be disposed between the two reinforcement legs 5401 ofeach of the two reinforcement members 540. In the embodiment ofFigure 2D, a diameter of the base structure 500 is substantially smaller than in the embodiments ofFigures 2A-2C, as readily apparent from a comparison between Figures 2B and 2D, which illustrate optical plates 310 having the same or similar dimensions. Thus, in the embodiment ofFigure 2D, a surface area of the base structure 500 may be substantially the same as a surface area of the optical plate 310. The peripheral base portion 520 may overlap with optical elements 311 arranged at corners of the optical plate 310 in a direction perpendicular to the optical plate 310. In other embodiments wherein the light module 300 does not comprise an optical plate 310, a surface area of the base structure 500 may be substantially the same as a surface area of the carrier 200, e.g. the PCB 210, and the peripheral base portion 520 may overlap with light sources arranged at corners of the PCB 210 in a direction perpendicular to the PCB 210. Figures 3A and 3B respectively illustrate a cross-sectional side view and a cross-sectional perspective bottom view of a light module and a base structure of a light emitting device according to an exemplary embodiment. The embodiment of Figures 3A and 3B corresponds to the embodiment of Figure 2B. It should be clear to the skilled person that the following description may also apply to the embodiments of Figures 2A and 2C-2D. As illustrated in Figures 3A and 3B, one of the optical plate 310 and the mesh 511 may comprise at least two pins P (see also Figure 2B), and the other one of the optical plate 310 and the mesh 511 may comprise at least two corresponding positioning holes H for positioning the light module 300 with respect to the central base portion 510. In the embodiment ofFigures 2B, 3A, and 3B, the optical plate 310 comprises two pins P (only one pinP is visible in Figures3A and 3B; see Figure 2B), and the mesh 511 comprisestwo corresponding positioning holesH (only one positioning holeH is visible in Figures 3A and 3B; see Figure 2B). In addition, the mesh 511 comprises two pins P (only one pin P is visible in Figures 3A and 3B), and the optical plate 310 comprises two corresponding positioning holesH (only one positioning holeH is visible in Figures 3A and 3B). In the embodiment of Figures 2B, 3A, and 3B, the carrier 200 comprises a PCB 210 whereon the plurality of light sources may be arranged. One of the carrier 200, e.g. the PCB 210, and the optical plate 310 may comprise at least two pins P (only one pin P is visible in Figures 3A and 3B), and the other one of the carrier 200, e.g. the PCB 210, and the optical plate 310 may comprise at least two corresponding positioning holes H (only one positioning hole H is visible in Figures 3A and 3B) for positioning the carrier 200, e.g., the PCB 210, with respect to the optical plate 310. In other embodiments wherein the light module 300 does not comprise an optical plate 310, one of the carrier 200, e.g. the PCB 210, and the mesh 511 may comprise at least two pins, and the other one of the carrier 200, e.g. the PCB 210, and the mesh 511 may comprise at leasttwo corresponding positioning holes for positioning the carrier 200 with respect to the central base portion 510. As illustrated in Figures 3A and 3B, the mesh 511 may be provided with at least two first fixation holes H1 (only one first fixation hole H1 is visible in Figures 3A and 3B; see Figure 2B) configured to respectively receive at least two first fixation elements (not shown) for fixing the base structure 500 to the carrier 200 and / or to the housing 100. Preferably, the at least two first fixation elements may comprise any one of the following: screws as in the embodiments ofFigures 3A and 3D, locks, clamps, clips, or a combination thereof. The at least two first fixation elements may be configured to fix the base structure 500 and the light module 300 to the carrier 200 and / or to the housing (not shown; see element 100 in Figures 1A-1C). Accordingly, the light module 300, in particular the optical plate 310, and the PCB 210 may be provided with corresponding holes. Figures 4A-4E respectively illustrate perspective views of a base structure and an accessory of a light emitting device according to several exemplary embodiments. Figures SA and 5B respectively illustrate cross-sectional side views of a base structure and an accessory of a light emitting device according to two different exemplary embodiments. As illustrated in Figures 4A-4E and 5A-5B, the base structure 500 may have a first side 501 facing the lightmodule (not shown; see element 300 in Figures 1A-3B) and a second side 502 opposite said first side 501. The peripheral base portion 520 may have an inner lateral surface S1 between said first side 501 and said second side 502 and facing the central base portion 510, and an outer lateral surface S2 opposite said inner lateral surface S1. The peripheral base portion 520 may be provided with a fixation means H3, H4 configured to fix the at least one accessory 400 to the base structure 500, as will be described in more details in the following. The at least one accessory 400 may comprise any one of the following: a skirt 410, 410 (see Figures 4A and 4B), a diffuser 420 (see Figure 4C), a color filter430 (see Figure4D), amask plate440 (see Figure 4E), a louver (not shown), such as a backlight louver, or a combination thereof. The central base portion 510 in the embodiment of Figures 4A-4E may be the same as the central base portion 510 in the embodiments of Figures 1A-3B. In particular, the mesh 511 in the embodiment ofFigures4A-4E may be the same as the mesh 511 in the embodiments ofFigures 1A- 3B. Thus, the description of the embodiments of Figures 1A-3B may apply to the embodiment of Figures 4A-4E. As illustrated in Figures 4A-4E and 5A, the peripheral base portion 520 may be provided with at least two third fixation holes H3 configured to respectively receive at least two third fixation elements (not shown) for fixing the at least one accessory 400 (e.g. a bowl-shaped diffuser 420 as illustrated in Figure 5A) to the base structure 500. Said at least two third fixation holes H3 may extend through at least the outer lateral surface S2, and optionally through the inner lateral surface S1. Compared to the embodiments of Figures 1A-1C, 2A-2C, and 3A-3B, wherein the peripheral base portion 520 is provided with six third fixation holes H3, in the embodiment of Figures 4A-4E and SA the peripheral base portion 520 is provided with three third fixation holes H3, which may be disposed symmetrically with respect to a center of the base structure 500, i.e., at an angle of 120° between two adjacent third fixation holes H3 with respect to said center. As illustrated in Figures 4A-4D and 5B, the peripheral base portion 520 may be provided with at least two protrusions 521 extending from the inner lateral surface S1, and with at least two fourth fixation holesH4 configured to respectively receive at leasttwo fourth fixation elements (not shown) for fixing the at least one accessory 400 (e.g. a bowl-shaped diffuser420 as illustrated in Figure 5B) to the base structure 500. Said at least two fourth fixation holes H4 may at least partially extend in said at least two protrusions 521 from said second side 502 towards said first side 501 of the base structure 500. The at leasttwo third fixation elements and / or the at leasttwo fourth fixation elements may comprise any one ofthe following: screws, locks, clamps, clips, or a combination thereof. Compared to the embodiments of Figures 1A-1C, 2A-2C, and 3A-3B, wherein the peripheral base portion 520 is provided with six protrusions 521 and with six fourth fixation holes H4, in the embodiment of Figures 4A-4E and 5B the peripheral base portion 520 is provided with three protrusions 521 and with three fourth fixation holes H4, which may be disposed symmetrically with respect to a center of the base structure 500, i.e., at an angle of 120° between two adjacent fourth fixation holes H4 with respect to said center. The three fourth fixation holes H4 may be provided in alternance with the three third fixation holes H3. In other words, every 60° from said center, there is provided on the peripheral base portion 520 either a third fixation hole H3 or a fourth fixation hole H4, in alternance. At least one of the three fourth fixation holes H4 may be provided with a metal insert. As illustrated in Figures 4A-4D, the base structure 500may further comprise at leasttwo connection legs 530 configured to connect the peripheral base portion 520 to the central base portion 510. Compared to the embodiments of Figures 1A-1C, 2A-2C, and 3A-3B, wherein the base structure 500 may further comprise at least two connection legs 530 each configured to connect a protrusion 521 of the peripheral base portion 520 to the central base portion 510, in the embodiment ofFigures 4A-4E the base structure 500 may further comprise at leasttwo connection legs 530 each configured to connect the inner lateral surface S1 of the peripheral base portion 520 to the central base portion 510 at locations other than the location of a protrusion 521, e.g. at either side of a protrusion 521 as illustrated in Figures4A and 4B. As illustrated in Figure 4A, the at least one accessory 400 may correspond to a skirt 410 made of a plain sheet, i.e., which may not comprise any geometrical pattern, and thus may not create shadow areas projected on a surface. The skirt410may interact with light emitted from the lightmodule (not shown; see element 300 in Figures 1A-3B) so as to modify a light distribution thereof, by e.g. narrowing a light beam of said light and / or by blocking light rays emitted from the light module at particular emission angles with respect to the horizontal, e.g. at large emission angles below the horizontal, which may otherwise result in glare that would cause discomfort. The skirt 410 may be made of plastic and / or metal, such as aluminum or steel. The skirt 410 may be provided with three through-holes corresponding to the three third fixation holes H3 provided to the peripheral base portion 520, and configured to receive the three third fixation elements (not shown) for fixing the skirt410 to the base structure 500. The skirt410may have a substantially cylindrical shape matching the substantially cylindrical shape ofthe peripheral base portion 520. It should be clear to the skilled person that other shapes are possible, depending on the shape of the peripheral base portion 520, and / or depending on the configuration and arrangement of the housing, in particular of the transparent or translucent casing (Figures 1A-1C). For example, square or rectangular shapes may be envisaged for the skirt 410. A height of the skirt410 may be substantially larger than a height of the peripheral base portion 520. For example, a height of the skirt 410 may be comprised between 25mm and 125 mm, preferably between 50mm and 100mm. As illustrated in Figure 4B, the at least one accessory 400 may correspond to a skirt 410 different from the skirt 410 illustrated in Figure 4A, i.e., the skirt 410 may further create shadow areas projected on a surface, such as a wall or a ground surface, by e.g. comprising a geometrical pattern, regular or irregular. In the embodiment of Figure 4B, the regular geometrical pattern comprises a plurality of hexagons and a plurality of pentagons. Other geometrical patterns may be envisaged. The skirt 410 may interact with light emitted from the light module (not shown; see element 300 in Figures 1A-3B) so as to modify a light distribution thereof, by e.g. narrowing a light beam of said light. The skirt 410 may be made of plastic and / or metal, such as aluminum or steel. The skirt 410 maybeprovided with three through-holes corresponding to the three third fixation holesH3 provided to the peripheral base portion 520, and configured to receive the three third fixation elements (not shown) for fixing the skirt 410 to the base structure 500. The skirt 410 may have a substantially cylindrical shape matching the substantially cylindrical shape of the peripheral base portion 520. Other shapes may be envisaged (see above with respect to the skirt 410). A height of the skirt 410 may be substantially larger than a height of the peripheral base portion 520, and substantially larger than a height of the skirt 410. For example, a height of the skirt 410 may be comprised between 50 mm and 250mm, preferably between 100mm and 200mm. As illustrated in Figure 4C, the at least one accessory 400 may correspond to a diffuser 420 having a bowl shape. The diffuser 420 may interact with light emitted from the light module (not shown; see element 300 in Figures 1A-3B) so as to modify an intensity and / or a color or color temperature thereof, by e.g. having a colored surface. The diffuser 420 may diffuse light emitted from the light module by e.g. having a translucent surface. The diffuser 420 may be made of plastic, such as polycarbonate or polypropylene. The diffuser 420 may be provided with three through-holes corresponding to the three third fixation holes H3 provided to the peripheral base portion 520, and configured to receive the three third fixation elements (not shown) for fixing the diffuser 420 to the base structure 500. An outer edge of the diffuser 420 may have a substantially circular shape matching the substantially cylindrical shape ofthe peripheral base portion 520. Other shapes may be envisaged (see above with respect to the skirt410 or 410). In embodiments wherein the light emitting device 1 further comprises at least one rod (not shown; see element 600 in Figures 1A-1C and 7B), preferably hollow, extending through the base structure 500 between the central base portion 510 and the peripheral base portion 520, as illustrated in Figure 7B, the at least one rod 600 may extend between two adjacent connection legs of the at least two connection legs 530 ofthe base structure 500 (see Figure 4C). Accordingly, the diffuser 420may be provided with at least one hole configured to receive the at least one rod 600. In the embodiment of Figure 4C, the diffuser 420 is provided with two holes, each configured to receive one rod 600. As illustrated in Figure4D, the at leastone accessory400may correspond to a color filter430 having a at shape. The color filter 430 may interact with light emitted from the light module (not shown; see element 300 in Figures 1A-3B) so as to modify an intensity and / or a color or color temperature thereof, by having a colored surface. The color filter 430 may be made of plastic, such as polycarbonate or polypropylene. The color filter 430 may be provided with three through-holes corresponding to the three fourth fixation holes H4 provided to the peripheral base portion 520, and configured to receive the three fourth fixation elements (not shown) for fixing the color filter430 to the base structure 500. An outer edge of the color filter 430 may have a substantially circular shape matching the substantially cylindrical shape ofthe peripheral base portion 520. Other shapes may be envisaged (see above with respect to the skirt410 or 410 or the diffuser 420). In embodiments wherein the light emitting device 1 further comprises at least one rod (not shown; see element 600 in Figures 1A-1C and 7B), the color filter 430 may be configured in the same or similar manner as the diffuser 420 (see above). As illustrated in Figure 4E, the at least one accessory 400 may correspond to a mask plate 440. The mask plate 440 may have an opening having a shape corresponding to a shape of the light module (not shown; see element 300 in Figures 1A-3B) so as to mask or hide portions of the light emitting device 1 other than the light module 300, i.e. the plurality of light sources and optionally the optical plate 310 in embodiments wherein the light module 300 comprises such an optical plate 310. In embodiments wherein the carrier (not shown; see element 200 in Figures 1A-3B) comprises a PCB 210 whereon the plurality of light sources may be arranged, themask plate440may have an opening having a shape and dimensions corresponding to a shape and dimensions of thePCB 210. The mask plate 440 may be made of plastic and / or metal, such as aluminum or steel. The mask plate 440 may be provided with three through-holes corresponding to the three fourth fixation holes H4 provided to the peripheral base portion 520, and configured to receive the three fourth fixation elements (not shown) for fixing the mask plate 440 to the base structure 500. An outer edge of the mask plate 440 may have a substantially circular shape matching the substantially cylindrical shape ofthe peripheral base portion 520. Other shapes may be envisaged (see above with respect to the skirt 410 or 410 or the diffuser420 or the color filter 430).A diameter ofthemask plate 440may be substantially larger than a diameter of the base structure 500, as illustrated in Figure 4E, to ensure that said portions of the light emitting device 1 other than the light module 300 are masked or hidden. An outer diameter of the mask plate 440 may correspond to an inner diameter of the transparent or translucent casing (not shown; see element 110 in Figures 1A-1C). In embodiments wherein the light emitting device 1 further comprises at least one rod (not shown; see element 600 in Figures 1A-1C and 7B), the mask plate 440 may be configured in the same or similar manner as the diffuser 420 or the color filter 430 (see above). In other embodiments, the at least one accessory 400 may comprise at least two of the above- mentioned skirt410 or 410, diffuser 420, color filter 430, andmask plate 440. In an example, the at least one accessory 400 may comprise a skirt 410 or 410 as illustrated in Figure 4A or 4B and a color filter 430 as illustrated in Figure 4D. The skirt 410 or 410 may be fixed to the base structure 500 bymeans ofthe at leasttwo third fixation holes H3 as described above in connection with Figure 4A or 4B, and the color filter430may be fixed to the base structure 500 by means of the at leasttwo fourth fixation holes H4 as described above in connection with Figure 4D. In another example, the at least one accessory 400 may comprise a skirt 410 or 410 as illustrated in Figure4A or 4B and a diffuser420 as illustrated in Figure 6B. The skirt410 or 410 may be fixed to the base structure 500 by means ofthe at leasttwo third fixation holesH3 as described above in connection with Figure4A or 4B, and the diffuser420may be fixed to the base structure 500 by means ofthe at leasttwo fourth fixation holes H4 as described above in connection with Figure 6B. It should be clear to the skilled person that other combinations of accessories may be envisaged in other embodiments. Although not illustrated in Figures 4A-4E, the at leastone accessory400may correspond to a louver, such as a backlight louver. The louver may be shaped such that it blocks light rays emitted from the lightmodule in one or more particular directions and / or at particular emission angles with respect to the horizontal. For example, a backlight louver may be shaped such that it blocks light rays emitted by the light module in a backward direction with respect to the light emitting device, e.g. towards a pole or a wall, such as a facade of a building, supporting the light emitting device, and at large emission angles below the horizontal, which may otherwise result in glare that would cause discomfort. A height of the louver may be higher in said one or more particular directions than a height of the louver in the other directions. In the example of a backlight louver, a height of the backlight louver may be higher in said backward direction than a height of the backlight louver in the other directions, i.e., the forward and the side directions with respect to the light emitting device. It is noted that the description of Figures SA and SB is not limited to the illustrated bowl-shaped diffuser 420, but also applies to the other types of accessories 400 described above: the above- mentioned skirt 410 or 410, the color filter 430, the mask plate 440, and the (backlight) louver. Figures 6A-6C respectively illustrate perspective views of a base structure of a light emitting device according to two different exemplary embodiments, and perspective views of a base structure and an accessory of a light emitting device according to several exemplary embodiments. Compared to the embodiments of Figures 1A-5C wherein the peripheral base portion 520 may be provided with at least two third fixation holes H3 and / or with at least two fourth fixation holes H4, as illustrated in Figures 6A-6C the peripheral base portion 520 may be provided with at least two clips 522 protruding from the outer lateral surface S2 (see Figures 6A and 6B), and the at least one accessory 400 may be provided with at least two corresponding slits 402 (see Figure 6C). In the embodiment of Figure 6A, the peripheral base portion 520 may be provided with four clips 522 protruding from the outer lateral surface S2, which may be disposed symmetrically with respect to a center of the base structure 500, i.e., at an angle of90° between two adjacent clips 522 with respect to said center. In other embodiments, more or less than four clips 522 may be provided to the peripheral base portion 520. For example, in the embodiment of Figure 6B, the peripheral base portion 520 may be provided with two clips 522 protruding from the outer lateral surface S2, which may be disposed diametrically opposed to each other with respect to a center of the base structure 500. The central base portion 510, in particular the mesh 511, of the embodiment ofFigure 6Amay correspond to the central base portion 510, in particular themesh 511, oftheembodiments ofFigures 1A-1C, 2A-2C, 3A-3B, and 4A-4E. The central base portion 510, in particular the mesh 511, of the embodiment of Figure 6B may correspond to the central base portion 510, in particular the mesh 511, of the embodiment ofFigure 2D. Thus, in the embodiment ofFigure 6B a diameter of the base structure 500may be substantially smaller than in the embodiment ofFigure 6A. As illustrated in Figure 6C, the at least one accessory 400 may comprise any one of the following: a skirt410, a diffuser420, a color filter430, amaskplate 440, a louver (not shown), such as a backlight louver, or a combination thereof. Apart from the fixation means used for fixing the at least one accessory400 to the base structure 500 (holes in Figures 4A-4E and slits 402 in Figures 6A-6C), the respective accessories 410, 420, 430, 440 illustrated in Figure 6C may correspond to the respective accessories 410, 420, 430, 440 illustrated in Figures4A and 4C-4E. Thus, the description ofFigures 4A and 4C-4E may apply to Figure 6C. Figures 7A and 7B respectively illustrate a bottom view of a light module and a base structure and a perspective bottom view of a light emitting device according to an exemplary embodiment. As illustrated in Figures 7A and 7B, the lightmodule 300 may further comprise an optical plate 310 comprising a plurality of optical elements 311 covering the plurality of light sources. The central base portion 510may be disposed on and / ormay surround the optical plate 310. The carrier200may comprise a PCB 210 (see Figure 7B) whereon the plurality of light sources may be arranged. The carrier 200 may comprise a gear plate 220 (see Figure 7B). The plurality of light sources may comprise LEDs. In the embodiment of Figures 7A and 7B, the light emitting device 1 comprises 20 light sources arranged on the carrier 200, which comprise a PCB 210 whereon the 20 light sources are arranged. Accordingly, the optical plate 310 comprises 20 optical elements 311, such as lenses 311 as illustrated in Figures 7A and 7B, each lens 311 covering one light source. Each light source may comprise oneLED or may comprise several LEDs. The 20 lenses 311 are aligned into 5 rows and 4 columns (5 x 4) to form a two-dimensional array oflenses 311. The 20 lenses 311 are non-rotational symmetric lenses 311 comprising a symmetry plane substantially perpendicular to a at portion of the lens plate 310. As illustrated in Figures7A and 7B, the central base portion 510may comprise amesh 511 disposed on the light module 300 and comprising a plurality of parallel mesh rods 5111 and at least one connection rod 5112 connecting the plurality ofmesh rods 5111. In the embodiment of Figures 7A and 7B, the mesh 511 comprises three parallel mesh rods 5111 and five connection rods 5112. Compared to the embodiments ofFigures 1A-6C, in the embodiment ofFigures 7A and 7B each of the five connection rods 5112 connects the first (left) mesh rod 5111, the second (central) mesh rod 5111, and the third (left) mesh rod 5111 together, and further extends from the left side of the first (left) mesh rod 5111 and from the right side of the third (right) mesh rod 5111. In other words, the five connection rods 5112 form together with the threemesh rods 5111 a two-dimensional array, i.e., a grid or matrix, ofrows and columns in a similar arrangement as the one of the 20 lenses 311. As illustrated in Figures 7A and 7B, at least one optical element 311 may be disposed between two adjacentmesh rods 5111 and at least one optical element 311 may be disposed between two adjacent connection rods 5112. In the embodiment of Figures 7A and 7B, one lens 311 is disposed between two adjacent mesh rods 5111 and one lens 311 is disposed between two adjacent connection rods 5112. The mesh 511 comprises a mesh rod 5111 disposed between each pair of adjacent columns of lenses 311, and a connection rod 5112 disposed between each pair of adjacent rows oflenses 311. In other embodiments, the light module 300 may not comprise an optical plate 310, and the central base portion 510 may be disposed on the carrier 200, e.g. on a PCB 210 whereon the plurality of light sources may be arranged, and / or may surround the plurality of light sources. In such embodiments, the mesh 511 may be disposed on the carrier 200, e.g. on the PCB 210. At least one light sourcemay be disposed betweentwo adjacentmesh rods 5111 and at least one light sourcemay be disposed between two adjacent connection rods 5112. As illustrated in Figures 7A and 7B, the mesh 511 may be provided with at least two first fixation holesH1 configured to respectively receive at leasttwo first fixation elements (not shown) for fixing the base structure 500 to the carrier 200, e.g. to the gear plate 220, and optionally to the housing 100. Preferably, the at least two first fixation elements may comprise any one of the following: screws as in the embodiments of Figures 7A and 7B, locks, clamps, clips, or a combination thereof. The at leasttwo first fixation elements may be configured to fix the base structure 500 and the lightmodule 300 to the carrier 200 (see Figure 7B), and optionally to the housing 100. Accordingly, the light module 300, in particular the optical plate 310, and thePCB 210may beprovided with corresponding holes. The at least two first fixation holes H1 may be disposed at intersections between a mesh rod 5111 and a connection rod 5112. As illustrated in Figures 7A and 7B, the mesh 511 may comprise a plurality of reective barriers 5113 configured to reect light rays, preferably having an incident angle with respect to an axis perpendicular to the lightmodule 300, in particular the lens plate 310, between apredetermined angle between 60° and 85°, and 90°, emitted through one or more light sources of said plurality of light sources, preferably with a reection angle with respect to said axis smaller than 60°. The plurality ofreective barriers 5113 may be disposed on the plurality ofmesh rods 5111 and / or on the at least one connection rod 5112. The plurality of reective barriers 5113 and the plurality of mesh rods 5111 and / or the at least one connection rod 5112 may be integrally formed. In the embodiment ofFigures 7A and 7B, the mesh 511 comprises 20 reective barriers 5113, each being associated with one lens 311 ofthe 20 lenses 311. The 20 reective barriers 5113 are disposed on the five connection rods 5112, four reective barriers 5113 per connection rod 5112. For each connection rod 5112, the four reective barriers 5113 and the connection rod 5112may be integrally formed. The 20 reective barriers 5113 may be configured as backlight elements. Thus, each reective barrier 5113 may be disposed on one side of a corresponding lens 311, between two adjacentrows oflenses 311, as illustrated in Figures7A and 7B. Each lens 311 may have an elliptical shape having a major axis and a minor axis. Each reective barrier 5113 configured as a backlight element may thus be arranged on one side along the major axis of a corresponding lens 311. Each reective barrier 5113 configured as a backlight elementmay have a concave reective surface and a convex surface opposite said concave reective surface. The concave reective surface of each reective barrier 5113 configured as a backlight element may be facing a corresponding lens 311 and may be arranged on one side along the major axis of said corresponding lens 311. In other embodiments, the plurality of reective barriers may be configured as reective elements having a shape, configuration, and arrangement different from backlight elements, as described in details in PCT publication WO 2020 / 058282 A1 in the name of the applicant, which is herein included by reference in its entirety. For example, the plurality of reective barriers may be configured as a light shielding structure configured to cut off or reect light rays having a large incident angle, i.e., as G-limiters, therebyreducing the light intensities at large angles and improving theG / G* classification ofthe light emitting device 1. In such embodiments, the plurality ofreective barriers may be arranged along the minor axis of corresponding lenses 311, between two adjacent columns of lenses 311 of the plurality of lenses 311. Referring to the lens plate 310 illustrated in Figures 7A and 7B, in such embodiments the mesh 511 may at least comprise 15 reective barriers configured as G-limiters, each being arranged between two adjacent columns oflenses 311. Said 15 reective barriers configured as G-limiters may be disposed on the three mesh rods 5111 illustrated in Figures 7A and 7B, five reective barriers per mesh rod 5111. For each mesh rod 5111, the five reective barriers 5113 and the mesh rod 5111 may be integrally formed. The mesh 511 may further comprise ten additional reective barriers configured as G-limiters, five being arranged at a left side ofcorresponding lenses 311 ofthe first (left) column oflenses 311, and five being arranged at a right side ofcorresponding lenses 311 of the last (right) column of lenses 311, i.e., a total of25 reective barriers configured as G-limiters. As illustrated in Figures 7A and 7B, the base structure 500 may further comprise at least two connection legs 530 configured to connect the peripheral base portion 520 to the central base portion 510. The peripheral base portion 520 and the at least two connection legs 530 in the embodiment of Figures 7A and 7B may respectively correspond to the peripheral base portion 520 and the at least two connection legs 530 in the embodiments of Figures 1A-1C, 2A-2C, and 3A-3B. Thus, the description ofthe embodiments ofFigures 1A-1C, 2A-2C, and 3A-3B may apply to the embodiment ofFigures 7A and 7B. As illustrated in Figure 7B, the light emitting device 1 may further comprise at least one rod 600, preferably hollow, extending through the base structure 500 between the central base portion 510 and the peripheral base portion 520. The at least one rod 600 may extend between two adjacent connection legs of said at leasttwo connection legs 530. In the embodiment ofFigure 7B, a firstrod 600 may extend between adjacent first and second connection legs 530, and a second rod 600 may extend between adjacent third and fourth connection legs 530. The at least one hollow rod 600 may be configured to accommodate at least one electrical cable for feeding any one ormore ofthe above- mentioned electrical / electronic components of the light emitting device 1 (see Figures 1A-1C). For this first purpose, the at least one hollow rod 600 may be made of a rigid or a exible material, e.g. plastic. Said electrical / electronic components of the light emitting device 1 may be arranged in a gear box 700, as illustrated in Figure 7B. Said gear box 700 may, alone or together with a cover 130 of the housing 100 (see also Figures 1A-1C), enclose said electrical / electronic components of the light emitting device 1. The at least one hollow rod 600may also be configured to increase a rigidity of the light emitting device 1. For this second purpose, the at least one hollow rod 600 may be made of a rigid material, e.g. plastic or metal, such as aluminum or steel. Whilst the principles of the invention have been set out above in connection with specific embodiments, it is to be understood that this description is merely made by way ofexample and not as a limitation ofthe scope ofprotection which is determined by the appended claims.

Claims

1. A light-emitting device (1) comprising: a housing (100); a carrier (200) designed to be attached to the housing (100); a light module (300) mounted on the support (200) and comprising multiple light sources; at least one accessory (400); and a basic structure (500) comprising a central base part (510) and a peripheral base part (520) connected to the central base part (510); where the central base part (510) is configured to connect to the carrier (200) and / or the housing to be confirmed; and where the peripheral base (520) is designed to connect to at least one accessory to be confirmed.

2. The light-emitting device according to claim 1, where the light module (300) further a optical plate (310) comprises, where the optical plate (310) one or more optical elements which covers the multiple light sources, where the central base part (510) is applied to and / or surrounds the optical plate.

3. The light-emitting device according to claims 1 or 2, where the central base part (510) a mesh (511) which is attached to the light module (300) and several parallel mesh bars (5111) and at least one connecting bar (5112) that the multiple connects mesh rods (511 1).

4. The light-emitting device within the meaning of claims 2 and 3, where at least one optical element (311) is placed between two adjacent mesh bars (5111) and / or where the at least one connecting rod (5112) between two adjacent optical elements (311) has been installed.

5. The light-emitting device according to claims 3 or 4, where the mesh (511) is provided of at least two mounting holes (H1) arranged to respectively at least two to receive fastening elements for attaching the base structure (500) to the carrier (200) and / or on the housing (100); where preferably the at least two fastening elements comprise one of the following: screws, locks, clamps, clips, or a combination thereof.

6. The light-emitting device referred to in claim 5, where the at least two fastening elements are designed to the base structure (500) and the light module (300) attach to the carrier (200) and / or the housing (100).

7. The light-emitting device within the meaning of claims 3 and 5, where the at least two mounting holes (H1) are provided at the intersections between a mesh bar (5111) and a connecting rod (5112).

8. The light-emitting device according to claim 2, optionally in combination with one of conclusions 3-7, where one of the optical plate (310) and the central base part (510) at comprises at least two pins (P), and the other of the optical plate (310) and the central base part (510) includes at least two corresponding positioning holes (H) for the positioning the light module (300) relative to the central base part (510).

9. The light-emitting device according to one of the preceding claims, where one of the carrier (200) and the central base part (510) comprises at least two pins, and the other of the carrier (200) and the central base part (510) at least two corresponding includes positioning holes for positioning the carrier (200) relative to the central base part (510).

10. The light-emitting device in accordance with one of the preceding claims, where the central base part (510) includes a frame (512) that is fitted around the light module (300) and designed to be attached to the carrier and / or to the housing (100).

11. The light-emitting device referred to in claim 10 and one of claims 3-9, where the frame (512) is designed to surround the mesh (511).

12. The light-emitting device according to claims 10 or 11, where the frame (512) is provided with at least two mounting holes (H2) arranged to respectively at least two to receive fastening elements for attaching the base structure (500) to the carrier (200) and / or on the housing (100); where preferably the at least two fastening elements comprise one of the following: screws, locks, clamps, clips, or a combination thereof.

13. The light-emitting device in accordance with one of the preceding claims, whereby the basic structure (500) a first side (501) facing the light module (300) and a second (502) opposite the first side (501); where the peripheral base part (520) has an inner lateral surface (Sl) between the first side (501) and the second side (502) and directed towards the central base part (510), and a outer lateral surface (SZ) opposite the inner lateral surface (Sl); and where the peripheral base part (520) is equipped with fasteners (H3, H4) to attach at least one accessory (400) to the base structure (500).

14. The light-emitting device according to claim 13, where the peripheral base (520) is equipped with at least two thirds mounting holes (H3) arranged to respectively to receive at least two-thirds fastening elements for attaching the ten at least one accessory (400) to the basic structure (500); where at least two-thirds mounting holes (H3) extend through at least the outer lateral surface (SZ), and optionally by the inner lateral surface (Sl).

15. The light-emitting device according to claims 13 or 14, where the peripheral base (520) is provided with at least two projections (521) extending from at least one of the inner lateral surface (Sl) and the outer lateral surface (SZ), and of at least two quarter mounting holes (H4) arranged to respectively at least two to receive fourth fastening elements for attaching at least one accessories (400) to the basic structure (500); where at least two quarters mounting holes (H4) extend at least partially into the at least two projections (521) from the second side (502) to the first side (501) of the base structure (500).

16. The light-emitting device within the meaning of claims 14 or 15, where at least two thirds fastening elements and / or at least two-quarters of a fastening element one of the include the following: screws, locks, clamps, clips, or a combination thereof.

17. The light-emitting device according to one of claims 13-16, where the peripheral base part (520) is equipped with at least two clips (522) that protrude from the outer lateral surface (SZ) to fit, and at least one accessory (400) is provided with at least two corresponding slots (402).

18. The light-emitting device according to one of the preceding claims, whereby the basic structure (500) furthermore includes at least two connecting legs (530) arranged to the to connect the peripheral base part (520) to the central base part (510).

19. The light-emitting device within the meaning of claims 15 and 18, where the at least two connecting legs (530) are designed to respectively the at least two projections (521) to connect to the central base part (520).

20. The light-emitting device according to one of the preceding claims, further comprising as at least one rod (600), preferably hollow, extending through the base structure (500) between the central basal part and the peripheral basal part.

21. The light-emitting device referred to in claims 19 and 20, where at least one rod (600) view extends between two adjacent connecting legs of the at least two connecting legs (530).

22. The light-emitting device according to one of the preceding claims, whereby it at least one accessory (40) includes one of the following: a skirt (410, 410), a diffuser (420), a color filter (430), a mask plate (440), a blind, such as a backlight blind, or a combination thereof.

23. The light-emitting device in accordance with one of the preceding claims, where the central base part (510) has a predominantly rectangular shape; and / or where the peripheral base part (520) has a predominantly cylindrical shape.

24. The light-emitting device in accordance with one of the preceding claims, where the height of the central base part (510) is between 1 mm and 5 mm, preferably between 2 mm and 4 mm; and / or where the height of the peripheral base part (520) is between 5 mm and 25 mm, at preference between 10 mm and 20 mm.

25. The light-emitting device according to one of the preceding claims, where a material of the basic structure (500) includes plastic; and / or where the central base part (510) and the peripheral base part (520) are formed integrally.

26. The light-emitting device pursuant to claim 3, optionally in combination with one of the previous conclusions, where the mesh (511) includes multiple reflective barriers (5113) designed to reflect light rays, preferably at an angle of incidence with respect to a axis perpendicular to the light module (300) at a predetermined angle between 60° and 85°, and 90°, emitted by one of the multiple light sources of the multiple light sources, at preference with a reflection angle relative to the axis less than 60°.

27. The light-emitting device according to claims 3 and 26, where the multiple reflective barriers (5113) are installed on the multiple mesh bars (5111) and / or on at least one mounting rod (5112); and / or where the multiple reflective barriers (5113) and the multiple mesh bars (5111) and / or the at least one connecting rod (5112) must be integrally formed.

28. The light-emitting device in accordance with one of the preceding claims, where the housing (100) a transparent or translucent casing (110) arranged to the basic structure (500) and to partially surround at least one accessory; and / or where the housing (100) includes a heat sink (120), and the carrier (200) is designed to connect to the heat sink (120) to be confirmed.

29. The light-emitting device according to one of the preceding claims, where the carrier (200) a printed circuit board, PCB (210) includes the multiple light sources; and / or where the carrier (200) includes a gear plate (220); and / or where the multiple light sources include light-emitting diodes, LEDs.

30. Use of a basic structure (500) according to one of the preceding conclusions in a light-emitting device (1) in accordance with one of the preceding claims.

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