Modular luminaires

Abstract

An arrangement for forming into a luminaire comprises one or more optical cells 10 each including means for receiving, collecting and redistributing light from a respective one of one or more LED ligh

Description

TECHNICAL FIELD 5 This invention relates to modular luminaires, more particularly (though not exclusively) to luminaires comprising a plurality of light sources (especially, though not exclusively, LEDs) and which employ a modular system of construction comprising plural discrete optical cells which can be assembled into various arrangements for producing luminaires of various configurations and designs. In particular, as well as relating to such luminaires themselves, 10 the invention also relates to arrangements or arrays of optical cells for assembly into luminaires, and to methods for the assembly of luminaires utilizing such arrangements or arrays. BACKGROUND AND PRIOR ART 15 As used herein, the term “luminaire” refers to and means an apparatus or device for emitting light in a particular desired distribution or pattern, comprising at least one, especially a plurality of, light source(s), and various other structural and / or optical components which are designed to connect the light source(s) to a power supply, to position and protect the light 20 source(s), and to distribute the light emitted by the light source(s) into the desired light output distribution or pattern. Such luminaires may be utilised for lighting applications in a wide range of indoor or outdoor scenarios and settings, including for example: industrial and commercial premises, offices and other workplaces, public buildings, private premises of various kinds, domestic settings, as well as others. 25 The past decade in the lighting industry can be characterized principally as a transition period from conventional incandescent and fluorescent lighting to LED (light emitting diode)-based lighting. Compared with conventional light bulbs and tubes, LEDs represent much more compact light sources, and they are also much more favourable in terms of energy 30 consumption and environmental impact. However, such advantages also come with various disadvantages. Looking at their advantages purely from an optical standpoint, small LED light sources give designers much greater flexibility in designing optics which can shape emitted light with much 35 higher degrees of precision and complexity than is possible with conventional light sources. Being small, LED sources also enable the design of more compact luminaires, and they can be easily arranged to form various shapes and layouts which may in itself add aesthetic value 23 04 25 to any given final design of luminaire. Due to their higher efficiency of converting electricity into light, compared with conventional light sources, LEDs also play an important role in energy-saving and ultimately less negative impact on the environment. 5 However, LEDs do have some disadvantages as well. Conversion of electrical energy into luminous energy happens over a very small area of an LED chip. Despite a high efficiency of conversion, there is still a significant portion of the overall converted energy which gets transferred as heat and which is concentrated into a very small area. The heat dissipation then becomes a key problem to solve, especially in the use of LEDs with high luminous flux. 10 The small light-emitting area of an LED may also pose a problem for a user or viewer of a luminaire or other lighting apparatus containing it. If viewed directly, an LED looks like an extremely bright, possibly blindingly so, dot. Therefore it is often desirable to increase the area of a LED’s light-emitting surface, which is typically done by an appropriate additional optical element (or optical system) or diffuser. Both of these disadvantages can sometimes 15 be suppressed, for example by arranging lower brightness LEDs into larger arrays - since lower brightness LEDs do not require such intensive cooling and in practice they may not be as blinding for the viewer even without the use of special optics. In fact, most known LED-based luminaires comprise an arrangement of a plurality of LEDs, 20 typically integrated on a circuit board. Typically they are combined into an optical element with one or more uniform optical features (e.g. diffusers) or embedded individualized optical features (e.g. lenses, reflectors) which convert the LED light into a desired output light distribution pattern. The individualized optical features embedded in an optical element are usually represented by an arrangement or array of one or more lenses and / or reflectors, 25 which may be embossed or molded into such an optical element. Such an arrangement of individualized optics is generally fixed and needs to be synchronized (i.e. matched) with the arrangement of LEDs on the circuit board. Patent documents US 2016 / 0215955 A1, US 9212803 B2, US 2006 / 0291206 A1 and US 2009 / 0002985 A1 show some examples of such known arrangements. Examples of luminaires with arrangements of LEDs used in 30 combination with non-individualized optics can be seen in patent documents US 2019 / 0368683 A1, US 8579467 B1 and US 2009 / 0323334 A1, for example. There are also known modular systems which can be used to create various luminaire arrangements from preconfigured cells containing an LED on a circuit board and attached 35 optics, such as that described and illustrated in US 8845129 B1. These cells can be arranged into linear or rectangular arrays, the optical cells being connected to each other through the electrical connectors on the LED circuit board, and then installed into a luminaire body. 23 04 25 These optical cells represent individualized optics operating on a single LED which are not pre-arranged into a specific array. The final arrangement of the optical cells is achieved only at the point of assembly of the final luminaire to create a desired overall optical cell configuration therein. 5 Another example of a known modular system of components which can be used for illumination is disclosed in EP 3192334 A1, in which a circuit board is designed to accept electrical components including LEDs with further attached optical components. Plural LED sources of the same or different types can be combined with optics of the same or different 10 types, while the circuit board holds them together in one specific arrangement. Yet another known modular system of optics operating on an array of LEDs is shown in US 2010 / 0225639 A1. Here a rectangular louver mask array, which controls blocking of the light, is designed to accept optics carriers in each of the respective positions of the array cells, and 15 various optical elements for processing light emitted by respective LEDs can be inserted into these carriers. The entire assembly is positioned over an array of the LEDs. All the above different approaches to arranging specific kinds of optics over an array of LEDs play a role in how luminaires have developed in the lighting industry to what we see and are 20 commercially available today. Pre-arranged fixed arrays of individual optics can be particularly useful in high volume production of luminaires, and modular systems with individualized optics give designers more freedom in designing various arrays suitable for various designs of luminaires. 25 However, known systems and techniques for providing pre-arranged arrays of individual optics for use with corresponding arrays of LEDs tend to be over-engineered and are still far from ideal, especially in terms of simplicity of construction, ease of use and versatility. Furthermore, the known systems and techniques have limitations in their ability to be applied to the production of luminaires across a wide range of sizes, shapes and designs, whilst still 30 maintaining the versatility and advantages of a modular-type system. It is thus a primary object of the present invention to address the shortcomings of the known art of luminaires and to provide a modular luminaire building or assembly system that is simple and cheap to manufacture, easy to use, and versatile in being able to be applied to 35 the production of luminaires across a wide range of sizes, shapes and designs. SUMMARY OF THE INVENTION 23 04 25 Accordingly, in a first aspect the present invention provides an arrangement for forming into a luminaire, the arrangement being as defined in claim 1. 5 In some practical embodiment forms of the above-defined arrangement of the first aspect, it may be provided in a physical form in which the plurality of light sources are present or have been mounted or positioned or otherwise included in or on or adjacent the respective optical cells of the arrangement, and the cells have been received in respective ones of some or all of the apertures of the configuring element. In this case, each optical cell can receive, collect 10 and redistribute light from a respective light source, and the configuring element accommodates or carries the optical cells in the predefined spatial arrangement or relative configuration or pattern by virtue of each of some or all of the apertures of the configuring element having received therein a respective one of the optical cells. 15 In some such practical embodiment forms of the above-defined arrangement, in addition to the above-defined optical cells and the configuring element, the arrangement may further comprise at least one circuit board or wiring board, or at least one portion of a circuit board or wiring board, having the light sources mounted, or pre-mounted, thereon in the predefined spatial arrangement or relative configuration or pattern. 20 In another aspect the present invention provides a luminaire comprising: at least one arrangement according to the first aspect of the invention or any embodiment thereof; a body or frame in which is contained the arrangement; and 25 a plurality of light sources, each said light source being mounted or positioned in or on or adjacent a respective optical cell received in a respective aperture of the configuring element, whereby each optical cell can receive, collect and redistribute light from a respective said light source; whereby the light sources are contained in the luminaire in the predefined spatial 30 arrangement or relative configuration or pattern defined by at least some of the apertures in the configuring element; wherein the luminaire further comprises at least one circuit board or wiring board on which is / are mounted, or has / have been pre-mounted, the light sources. 35 In some practical embodiment forms of the above-defined luminaire of the preceding aspect, it may be provided in a physical form in which the light sources have not yet been included, mounted or positioned in or on or adjacent the respective optical cells of the arrangement. 23 04 25 In this case, in another aspect the present invention further provides an assembly for forming into a luminaire, the assembly comprising: at least one arrangement according to the first aspect of the invention or any embodiment thereof; and 5 a body or frame in which is contained the arrangement; wherein each respective optical cell received in a respective aperture of the configuring element is for receiving, collecting and redistributing light from a respective one of the light sources in the predefined spatial arrangement or relative configuration or pattern defined by at least some of the apertures in the configuring element. 10 In some other practical embodiment forms of the above-defined luminaire of the preceding aspect, it may - perhaps practically more usually or usefully - be provided in a physical form in which the light sources (mounted or pre-mounted on at least one circuit board or wiring board, or at least one portion of a circuit board or wiring board) have already been included, 15 positioned or mounted in or on or adjacent the respective optical cells of the arrangement, but the arrangement+light sources (+circuit / wiring board or portion thereof) combinations (or pre-assembled arrangement+light sources (+circuit / wiring board or portion thereof) combinations or units) have not yet been mounted or positioned in the body or frame of the luminaire. In this case, in an alternative further aspect the present invention further provides 20 an assembly for forming into a luminaire, the assembly comprising: at least one arrangement according to the first aspect of the invention or any embodiment thereof; and a plurality of light sources, each light source being mounted or positioned in or on or adjacent a respective optical cell received in a respective aperture of the configuring element, 25 whereby each optical cell can receive, collect and redistribute light from a respective light source; wherein each light source is mounted or pre-mounted on at least one circuit board or wiring board, or at least one portion of a circuit board or wiring board, and the assembly further comprises the circuit board or wiring board, or the portion of either thereof. 30 In a further aspect the present invention provides a method of production of a luminaire, the method being as defined in claim 28. In some embodiments of the above-defined method, the step (ii) of mounting or positioning 35 the light sources in or on or adjacent respective optical cells received in respective apertures of the configuring element may comprise mounting or positioning in or on or adjacent respective optical cells of the arrangement at least one circuit board or wiring board, or at 23 04 25 least one portion of a circuit board or wiring board, on which have already been pre-mounted the light sources in the predefined spatial arrangement or relative configuration or pattern which is substantially the same as or corresponds to the predefined spatial arrangement or relative configuration or pattern of some or all of the apertures in the configuring element. 5 Alternatively this particular step (ii) may be thought of or defined as comprising mounting or positioning respective optical cells of the arrangement on or over or adjacent respective ones of the light sources, or on or over or adjacent respective ones of the light sources which have already been pre-mounted on the circuit board or wiring board or the portion of a circuit board or wiring board. 10 In a yet further aspect the present invention provides a kit of parts for use in forming a luminaire, the kit being as defined in claim 30. As used herein, the term “light” is intended to be construed broadly as meaning any 15 wavelength / frequency of electromagnetic radiation in the electromagnetic spectrum. However, in most practical embodiments of the invention, light in the visible region of the spectrum may be employed and may thus be provided by the various light sources. However, it may be possible, e.g. in certain more specialist embodiments, for LEDs or other light sources to be employed which emit electromagnetic radiation in one or more non-visible, 20 e.g. infra-red or ultraviolet, regions of the spectrum. In many embodiments of the invention in its various aspects, each light source of the plurality of light sources may comprise one or more LEDs (light emitting diodes). 25 In some such embodiments each one of the light sources may comprise a single LED (or other light emitting device). In such embodiments, therefore, each optical cell may comprise, or may have mounted or positioned therein or thereon or thereadjacent, or may be for having mounted or positioned therein or thereon or thereadjacent, a single LED (or other light emitting device). 30 However, in other such embodiments each one of the light sources may comprise a plurality of LEDs (or other light emitting devices), in the form of an array, cluster, series or group thereof, especially one in which the LEDs (or other light emitting devices) are closely or tightly packed so as to be in close proximity to one another. In such other embodiments, therefore, 35 each optical cell may comprise or may have mounted or positioned therein or thereon or thereadjacent, or may be for having mounted or positioned therein or thereon or thereadjacent, an array, cluster, series or group of a plurality of LEDs (or other light emitting 23 04 25 devices). Within individual such arrays / clusters / series / groups of pluralities of LEDs (or other light emitting devices) the LEDs / devices may be arranged in any desired geometrical manner relative to each other, e.g. symmetrically, asymmetrically, regularly, irregularly, linearly (e.g. in one or more straight or curved lines) or even randomly. Furthermore, within each individual 5 such array / cluster / series / group of a plurality of LEDs (or other light emitting devices) the LEDs / devices may be arranged or mounted substantially in a single plane, e.g. by virtue of being mounted on at least one substantially planar circuit board or wiring board, or substantially planar portion of a circuit board or wiring board. 10 In certain embodiments of the invention, one or more of the light sources may even comprise one or more multi-chip LEDs (such as a dual-chip LED, e.g. a dual colour LED, a quad RGBW chip LED, or even others). Furthermore, in many embodiments of the invention in its broader aspects as variously 15 defined above, the light sources in the predefined spatial arrangement or relative configuration or pattern which are used to form the luminaire may themselves be mounted or arranged, and especially may be provided ready for use and assembly by being premounted or pre-arranged, on at least one circuit board or wiring board, or at least one portion of a circuit board or wiring board, in substantially a single common plane, by virtue of being 20 mounted or pre-mounted on a single common planar circuit board or wiring board, or a single common planar portion of either thereof, or a plurality of individual circuit board or wiring board elements each lying in a common plane. Alternatively, however, in certain other embodiments of the invention in its broader aspects 25 as variously defined above, the light sources in the predefined spatial arrangement or relative configuration or pattern which are used to form the luminaire may themselves be mounted or arranged, and especially may be provided ready for use and assembly by being premounted or pre-arranged, either: (i) on a single common circuit board or wiring board, or a single common portion of 30 either thereof, which is shaped or configured in a substantially non-planar, e.g. arcuate or otherwise curved in three dimensions, shape or configuration, or (ii) on a plurality of individual circuit board or wiring board elements which are collectively arranged or configured relative to each other so as to form a substantially non-planar, e.g. arcuate or otherwise curved in three dimensions, shaped or configured circuit 35 board / wiring board arrangement. In any given embodiment of a luminaire or an assembly within the scope of the invention, 23 04 25 means may be provided, e.g. in the form of appropriate wiring and / or circuitry, for connecting each LED (or other light emitting device) to an appropriate electrical power source, which may for example be provided either as an external power source (e.g. the electrical mains, optionally via a transformer) or alternatively as an on-board battery or other power supply, 5 e.g. contained within the overall luminaire body or frame. In some practical embodiments of the invention, the various light sources of the plurality thereof may be arranged in the final luminaire - or in the arrangement or assembly ready for forming into the luminaire - in the predefined spatial arrangement or relative configuration or 10 pattern that corresponds to the predefined spatial arrangement or relative configuration or pattern of the apertures in the configuring element, which itself defines the predefined spatial arrangement or relative configuration or pattern in which the respective optical cells are arranged once they have been received therein. Thus, when the various light sources, e.g. LEDs, are provided in the form of at least one circuit board or wiring board, or at least one 15 portion of a circuit board or wiring board, having the various LEDs already mounted thereon, the arrangement of the LEDs thereon may thus be the same as, or correspond to, or match, or be synchronized with, the predefined spatial arrangement or relative configuration or pattern of those of the apertures in the configuring element that are in the predefined spatial arrangement or relative configuration or pattern. In this manner, the at least one circuit board 20 or wiring board, or at least one portion of either thereof, with the pre-mounted LEDs thereon, can be simply brought together with the configuring element and optical cells received in the apertures therein, e.g. with the discrete optical cells being glued or otherwise attached (e.g. by clips or snap- or click-fit devices) to the at least one circuit- or wiring board (or at least one portion of either thereof), and the arrangement components assembled together into the final 25 luminaire, without further adjustment or reconfiguring of the LEDs’ arrangement. In accordance with the invention in its various aspects, each optical cell comprises: (i) a light collector element, (ii) a cover element attached to the light collector element, and 30 (iii) a transmission element mounted between the light collector element and the cover element; wherein: (iv) the light collector element comprises a body including: an input for receiving and collecting light from at least one light source, 35 an output for propagating collected light towards the transmission element, at least one wall defining one or more portions of the body between its input and output and configured for collecting light entering the body via its input and conveying or 23 04 25 directing said light towards its output, and attachment means for mechanically attaching the body of the light collector element to the cover element and securing the transmission element between the light collector element and the cover element; 5 (v) the cover element comprises: an input opening facing towards the transmission element and for receiving light transmitted by the transmission element, an output opening via which light is outputted from the optical cell, and at least one internal surface defining a cavity within the cover element 10 between its input and output openings, the cavity’s internal surface(s) being configured for allowing or effecting passage of light, or a portion of the light, through the cavity from the cover element’s input opening towards its output opening; and (vi) the transmission element comprises: one or more planar optical elements, 15 wherein the or each optical element includes a first surface facing towards the output of the light collector element and a second surface facing towards the input opening of the cover element, and the or each optical element exhibits a predetermined optical activity or function in its transmission of light incident thereon which has exited the output of the light 20 collector element and is transmitted by the transmission element towards the input opening of the cover element. Thus, in embodiments of the invention, in each above-defined optical cell, the light collector element of each optical cell comprises a body including: 25 an input for receiving and collecting light from at least one light source, an output for propagating collected light towards the transmission element, at least one wall defining one or more portions of the body between its input and output and configured for collecting light entering the body via its input and conveying or directing said light towards its output, and 30 attachment means for mechanically attaching the body of the light collector element to the cover element and securing the transmission element between the light collector element and the cover element; In a first species of some such embodiments, the light collector element of each optical cell 35 may take the form of a hollow body, the body comprising: an input opening for receiving and collecting light from at least one light source, an output opening for propagating collected light towards the transmission element, 23 04 25 at least one internal wall defining a chamber within the light collector element between its input and output openings, the chamber wall(s) being configured for collecting light entering the chamber via the light collector element’s input opening and conveying or directing or redirecting said light, or a portion of said light, towards its output opening, and 5 attachment means for mechanically attaching the light collector element to the cover element and securing the transmission element between the light collector element and the cover element. However in a second species of some such embodiments, the light collector element of each 10 optical cell may take the form of a body, especially a substantially solid body, of light-permeable or light-transparent or light-transmissible material, the body comprising: an input surface for receiving and collecting light from at least one light source, an output surface for propagating collected light towards the transmission element, at least one wall, especially at least one exterior wall, defining one or more portions 15 of the body of the light collector element between its input and output surfaces, the at least one wall being configured for collecting light entering the body via the light collector element’s input surface and redirecting and / or guiding said light, or a portion of said light, towards its output surface at least in part by means of TIR (total internal reflection) phenomena, and attachment means for mechanically attaching the light collector element to the cover 20 element and securing the transmission element between the light collector element and the cover element. Thus in various such embodiments of the invention in its various aspects, the light collector element of each optical cell, or of any one or more of the optical cells independently of any 25 other one or more of the optical cells, may take the form of either a hollow body species with a light-conveying / directing / redirecting chamber therewithin or a solid body species which relies at least in part on TIR for its light-conveying / guiding capability. Thus, in such embodiments of luminaires according to the invention, the light collector 30 element of each of any one or more optical cells may be selected from the above-defined first or second species types independently of the light collector element of the other optical cell(s) of the plurality, whereby different individual ones of the optical cells may comprise either the same or different ones of the above-defined species types of light collector element. Thus, although in many such embodiment luminaires it may be the case that all 35 the optical cells comprise the same species type of light collector element, it may be possible in certain other such embodiment luminaires for one or more of the optical cells to be of one species type and one or more other(s) of the optical cells to be of the other, different species 23 04 25 type. In some of the above embodiments, the light collector element of the first species type may comprise any suitably shaped and / or configured body, housing, casing or container, e.g. of 5 a moulded plastics material, which comprises one or more internal walls defining and enclosing the said internal chamber therewithin. In many practical such embodiments, the chamber may be configured for containing, or for having protruding thereinto, or for having mounted adjacent a lower opening or mouth thereof (“lower” in this context meaning a side of the light collector element distal or remote from the cover element) the respective light 10 source associated with that optical cell when the components of the final luminaire are fully assembled. In some of the above embodiments the input opening of the light collector element of the first species type may thus comprise an opening, mouth or aperture in a lower side or basal wall 15 thereof, for receiving and collecting light from the respective light source associated with that optical cell. Such a lower input opening, mouth or aperture may for example be generally substantially circular in shape, or alternatively may of another suitable shape, e.g. elliptical, polygonal, rectangular, square, etc. 20 In some of the above embodiments the output opening of the light collector element of the first species type may likewise comprise an opening, mouth or aperture in an upper side or top wall thereof, for propagating light collected from the respective light source associated with that optical cell and passing through the chamber towards the transmission element. Such an upper output opening, mouth or aperture may for example be generally substantially 25 circular in shape, or alternatively may of another suitable shape, e.g. elliptical, polygonal, rectangular, square, etc. In some such embodiments the shape of the upper output opening, mouth or aperture may be substantially geometrically similar to the shape of the lower input opening, mouth or aperture. Alternatively or additionally, in some such embodiments the upper output opening, mouth or aperture may be substantially larger in diameter or width 30 than the lower input opening, mouth or aperture. In above embodiments the light collector element of the first species type may for instance be injection-moulded from any suitable plastics material, especially any suitable polymeric material, such as a suitably selected molecular-weight and / or cross-linked variety or species 35 of polymeric substance, examples of which are numerous and readily available in the art of plastics. For example, a polycarbonate (PC) may be one such useful material, although many other examples may also be used instead, such as any of the following: 23 04 25 polymethylmethacrylate (PMMA), acrylonitrile-butadiene-styrene (ABS), epoxy resins, glass-reinforced plastic (especially polyester-based) (GRP), polytetrafluoroethylene (Teflon), high density polyethylene (HDPE), polystyrene (PS), high impact polystyrene (HIPS), low density polyethylene (LDPE), polypropylene (PP), melamine formaldehyde (MF), polyamides (e.g. 5 nylons) (PE), phenolic resins (e.g. phenol formaldehyde (PF)), polyacrylonitrile (PAN), polyesters (e.g. unsaturated polyester resin (UPR)), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyvinyl chloride (PVC), unplasticized PVC (uPVC), styrene-acrylonitrile (SAN), sheet moulding compounds (SMC) (e.g. sheets of glass fibre impregnated with polyester resin), thermoplastic polyurethanes (TPU), to name but a few. 10 As an alternative to plastics materials, the light collector element of the first species type may instead be formed from a metal or metal alloy, e.g. steel, aluminium, an aluminium alloy, as well as other metals or alloys with suitable physical properties. Any suitable known manufacturing and / or processing techniques may be used for such metallic light collector 15 elements’ production, such as forming (e.g. sheet forming), casting and / or machining production methods. In some of the above embodiment forms of each optical cell, the light collector element of the first species type may comprise at least one reflecting and / or collimating element or 20 feature for reflecting and / or collimating light entering the chamber therewithin from the respective light source associated with that optical cell and directing or redirecting that light towards the chamber’s output opening and thus towards the transmission element, and optionally further onwards towards the cover element (and in particular towards the input opening of the cover element) of that optical cell. 25 In some such embodiments the at least one reflecting and / or collimating element or feature may comprise one or more of the said internal walls themselves that define the chamber within the light collector element. Such internal walls may thus in some embodiments comprise, or may function as, one or more light-reflecting walls or surfaces and / or one or 30 more internal walls or surfaces that function to collimate light passing through the chamber in the light collector element. The or each internal light-reflecting and / or light-collimating wall or surface may for example be formed of or coated with any suitable light-reflecting material, such as a metal or metal alloy, e.g. consisting of or containing aluminium or alternatively silver or gold, or other light-reflecting and / or light-collimating substance. The light-reflecting 35 coating may typically be applied to one or more internal walls or surfaces of the body, housing, casing or container which forms the main structure of the light collector element, and such coating may be effected by means of any suitable known coating technique, e.g. 23 04 25 vacuum deposition, as well as others. In some of the above embodiments, the one or more internal walls or surfaces of the light collector element of the first species type, especially that / those internal walls or surfaces 5 which are formed of or coated with a light-reflecting and / or light-collimating material, may be of any suitable geometrical shape, especially in their regions or portions between the light collector element’s input and output openings, when viewed in plan or in transverse crosssection. For example, a light collector element with internal walls or surfaces of, or configured in, a generally substantially circular shape (when viewed in plan or in transverse cross-10 section) may typically be employed. However, other internal shapes are possible instead, e.g. elliptical, rectangular, square, polygonal (e.g. hexagonal), etc. In some such embodiments the general shape - when viewed in plan or in transverse crosssection - of the internal walls or surfaces of the light collector element of the respective optical 15 cell may be substantially geometrically similar to the corresponding shape, also when viewed in plan or in a plane parallel to the said transverse cross-section - of either or both of the upper output opening, mouth or aperture and / or the lower input opening, mouth or aperture of the light collector element. 20 In some of the above embodiments the internal wall(s) defining the chamber within the light collector element of the first species type may be configured such that the chamber is generally substantially conical, part-conical or frusto-conical in its three-dimensional shape, especially with its diameter / width increasing passing from the light collector element’s input opening to its output opening. In other embodiments, however, other three-dimensional 25 shapes of the chamber may be possible instead, by virtue of the chamber’s defining internal wall(s) being configured accordingly. Such alternative chamber shapes may for example be generally substantially cylindrical, or pyramidal (especially inverted pyramidal) with any number of sides from 3 upwards (e.g. a pyramid with from 3 to 6 or 7 or 8 sides), or even other geometrical or polyhedral shapes. 30 In some of the above embodiments of the invention, the light collector element of the second species type may comprise any suitably shaped and / or configured substantially solid body of light-permeable or light-transparent or light-transmissible material, e.g. of a moulded plastics material or a glass, which comprises one or more external walls, especially one or 35 more external side walls, configured so as redirect and / or guide light, or a portion of the light, that has entered the body towards the body’s output surface at least in part by virtue of one or more TIR (total internal reflection) phenomena. In some such embodiments the body may, 23 04 25 if desired or appropriate, be formed or shaped or configured with at least part of its input surface including at least one recess or indentation for accommodating therewithin, or for having protruding thereinto, or for having mounted thereadjacent, the respective light source associated with that optical cell when the components of the final luminaire are fully 5 assembled. In some such practical embodiments, the one or more external side walls of the light collector element of the second species type may be shaped or configured in any suitable or appropriate or desired shape or configuration, or combination of shapes or configurations in 10 different portions of said external side wall(s), which act(s) to effect the desired TIR (total internal reflection) phenomena which at least in part serve to redirect and / or guide light, or a portion of the light, that has entered the body towards the body’s output surface. Suitable such exterior shapes of any one or more of, or one or more portions of, the TIR solid body side wall(s) may include, for example: conical, part-conical or frusto-conical, paraboloidal, 15 hyperboloidal, cylindrical, pyramidal (especially inverted pyramidal) with any number of sides from 3 upwards (e.g. a pyramid with from 3 to 6 or 7 or 8 sides), or circular or elliptical or polygonal in horizontal or transverse cross-section, or with side wall(s) or one or more portions of one or more side walls being either substantially planar or alternatively curved or arcuate in shape moving from the body’s input surface to its output surface with a curve 20 function defined by any suitable / appropriate geometric curve function, especially a curve function that provides the TIR capability. Suitable materials for forming, e.g. by moulding, the solid body of the or each light collector element of the second species type may be selected from any suitable light-permeable or 25 light-transparent or light-transmissible material, e.g. various plastics materials, such as polycarbonate (PC), polymethylmethacrylate (PMMA), polyethylene terephthalate (PET), or a glass. In some of the above embodiments the light collector element of either the first or second 30 species types may include support means for supporting the transmission element in the finally assembled optical cell, especially in order to assist in effecting a secure and stable supported mounting of the transmission element, relative to the light collector element and the cover element, in the finally assembled optical cell. Such support means may for example comprise one or more supporting walls, wall portions, ledges, recesses, shoulders, 35 lands or surfaces of, or forming part of, the light collector element. In some of the above embodiments the light collector element of either the first or second 23 04 25 species types may include mounting means for mounting the light collector element on a circuit board or wiring board, or a portion of either thereof, carrying the respective LED(s) (or other light source(s)) for association with that respective optical cell. Such mounting means may take any of various forms: For example: 5 (i) the mounting means may comprise one or more, e.g. a plurality of or one or more pairs of, pins, spigots, ribs, protrusions, detents, clips, hooks, retaining members / elements, friction-fit or snap-fit elements, or solderable components (e.g. pins, terminals, connectors, electronic components, spring contacts, etc, or even surface-mounted components such as those compatible with “pick &place” technology), or other (inter-)engagement elements, 10 provided on one of the light collector element and a portion of the circuit- or wiring board (usually on the light collector element itself), and a corresponding or appropriate number of one or more holes, apertures, recesses, grooves, channels, notches, or corresponding clip, hook, retainer, friction-fit or snap-fit elements, or solderable components (e.g. pins, terminals, connectors, electronic components, spring contacts, etc, or even surface-mounted 15 components such as those compatible with “pick &place” technology) or other (inter-)engagement elements (for inter-engagement with the aforementioned (inter-)engagement element(s)) provided on the other of the light collector element and the portion of the circuit-or wiring board (usually on the portion of the circuit- or wiring board itself), whereby the light collector element can be united with the circuit- or wiring board through inter-engagement of 20 the respective pairs of inter-engagement elements; and / or (ii) the mounting means may comprise a suitably sized, shaped and positioned land, seating element or portion, or mounting surface on at least one of, optionally both of, the light collector element and a portion of the circuit- or wiring board, via which the light collector element can be adhered to the circuit- or wiring board, e.g. by use of a suitable adhesive 25 (examples of which are well-known in the art and widely commercially available); and / or (iii) the mounting means may comprise one or more sockets (e.g. of metal and / or plastics material), especially a socket provided on one of the light collector element and a portion of the circuit- or wiring board (usually the latter) into which can be plugged a corresponding pin, spigot, protrusion, or other pluggable securement element provided on 30 the other of the light collector element and a portion of the circuit- or wiring board (usually the former). Where such mounting means is of type (ii) above, in some such embodiments a mounting surface of the light collector element and / or a mounting surface of the portion of the circuit-35 or wiring board may be furnished with an adhesive layer or one or more adhesive lands / patches. The adhesive may be of any of various known types, such as self-adhesives, UV- or thermally activated adhesives, adhesives resistant to the high temperatures 23 04 25 (especially above 80°C), etc. In some embodiments, either in addition to or as an alternative to the provision or inclusion of the above-defined mounting means for mounting the light collector element on a circuit 5 board or wiring board (or a portion of either thereof), the cover element may additionally or alternatively be provided with or include auxiliary mounting means, for mounting the cover element onto the circuit board or wiring board (or a portion of either thereof). Where such auxiliary mounting means are provided, they may take any of the same various forms as defined in (i), (ii) or (iii) immediately above for the mounting means for mounting the light 10 collector element on the circuit- or wiring board (or portion of either thereof). Alternatively any other suitable auxiliary mounting means or device(s), e.g. mechanical attachment element(s) / device(s) or an adhesive, may be used instead for the same purpose. If desired or necessary, in some embodiments of the arrangement or assembly or luminaire 15 of the invention, secondary mounting means may be provided for mounting or securing or attaching the configuring element on or to a circuit board or wiring board, or a portion of either thereof, carrying the respective LEDs (or other light sources) for association with the respective optical cells. Such secondary mounting means may take any of the same various forms as defined in (i), (ii) or (iii) immediately above for the mounting means for mounting the 20 light collector element on the circuit- or wiring board (or portion of either thereof). Alternatively any other suitable mounting means or device(s), e.g. screws, bolts or rivets that fix into corresponding holes, or an adhesive, may be used instead for the same purpose. Thus, in any given such embodiment of the invention in its various aspects, especially those 25 which relate to assemblies with light sources on circuit- or wiring board(s) and / or to luminaires, the configuring element may comprise such secondary mounting means for the mounting or securing or attaching of the configuring element alone, or with the optical cells inserted or mounted in their respective apertures therein, onto or to the circuit / wiring board(s) with the light sources mounted or pre-mounted thereon, and / or onto or to a body or frame of 30 the luminaire, and / or any other parts of the luminaire. Such secondary mounting means may include, for example, any suitable number and arrangement of mounting holes in the board and / or the configuring element for attaching the configuring element to the board, for example, by screws, directly or through standoffs, or by snap-in, click-in or other interengagement features or components (e.g. pins, connectors, terminals, etc.) protruding from 35 the configuring element and / or the board and which fit into and / or inter-engage with the mounting holes and thereby create a secure connection or attachment (e.g. by a friction fit, or interlocking mechanism) between the board and the configuring element. 23 04 25 If desired or necessary, in some embodiments of the arrangement or assembly or luminaire of the invention, tertiary mounting means may be provided for mounting or securing or attaching the configuring element to a luminaire body or frame, or any other part of the 5 luminaire. Such tertiary mounting means may for example comprise any suitable number and arrangement of tabs or wings or extensions for e.g. sliding the configuring element into a corresponding number and arrangement of slot(s) or channel(s) in the luminaire body or frame (or other luminaire part), or any suitable number and arrangement of mounting holes or apertures (e.g. screw holes) for fastening the configuring element to the luminaire body or 10 frame (or other part thereof). The outer shape of the configuring element (or the relevant portion thereof) may for instance be designed to fit into matching e.g. recess(es), notch(es), channel(s) / groove(s), etc in the luminaire body / frame (or other part thereof). In addition to such tertiary mounting means, the configuring element may yet further also 15 contain alignment or orientation means such as any suitable number and arrangement of notch(es), recess(es), channel(s) / groove(s), hole(s), aperture(s), tab(s), wing(s), extension(s), pin(s), leg(s), etc which match corresponding counterparts thereto (e.g. of any of the aforementioned types) on the circuit / wiring board and / or in or on the luminaire body or frame (or other part thereof) for enabling the configuring element to fit and be mounted 20 securely into the luminaire and / or to be mounted on the circuit / wiring board in a desired orientation. Any of the above tertiary mounting and / or alignment / orientation means features on the configuring element may, if desired or appropriate, be preformed into a specific shape. For 25 example, one or more such tab(s), wing(s), extension(s), pin(s), leg(s), etc could be formed with or into a bent configuration so as to form a feature that is more readily or reliably directly mountable or attachable onto the relevant circuit / wiring board or luminaire body / frame (or other part thereof), as may be desired or appropriate to the design of the luminaire. 30 In practising many of the above embodiments of the invention in its various aspects the light sources (e.g. LEDs) that are employed may generally be provided for use and incorporation into the relevant arrangement, assembly or luminaire with the optical cells by virtue of being already mounted or pre-mounted on a circuit board or wiring board (or a portion of either thereof), e.g. a PCB (printed circuit board), prior to actually being mounted into combination 35 with the relevant optical cells or the cells)actually being mounted thereon, via the above mounting means. 23 04 25 Such mounting means of type (i) above may inherently also usefully serve as alignment means, for aligning the light collector element into a correct position and / or orientation upon it being mounted on the circuit board or wiring board (or portion thereof). 5 In some of the above embodiments, especially (though not necessarily) in which the mounting means is of type (i) above where the mounting means comprises one or more pins, spigots, ribs, protrusions, solderable components or similarly shaped (inter-)engagement elements, the mounting means may include or be provided with - or they may themselves also act as - spacer means for defining and setting a predetermined spacing distance 10 between the circuit- or wiring board (or portion thereof) and the light collector element once the latter has been mounted thereon. Such spacer means may comprise, for example, any suitable spacing element, shoulder, flange, collar, leg, pin or other spacing portion. In above embodiments the light collector element of either the first or second species types 15 may include first attachment means, or a component of first attachment means, for mechanically and securely - and optionally also removably - attaching the light collector element to the cover element of the respective optical cell, with the transmission element secured therebetween. Such first attachment means, or component of such first attachment means, that is provided on the respective light collector element may be provided thereon 20 externally of the body thereof (especially externally of the chamber therewithin when it is of the first species type). Furthermore, any component of such first attachment means that is provided on the respective cover element may be provided thereon externally of the cavity therewithin. 25 Such first attachment means may take any of various forms: For example, the first attachment means may comprise one or more, especially one or more pairs of or a plurality of, snap-fit connection elements provided on the light collector element which is / are inter-engageable in a snap-fit manner with one or more corresponding snap-fit connection elements provided on the cover element. 30 Such first attachment means that are constructed or designed so as to render the light collector element removably attachable to the cover element may be particularly useful in some embodiments of the invention where the light collector element is designed or intended to be replaceable or interchangeable with one or more different cover elements, or from one 35 optical cell to another optical cell, especially as may be the case with embodiments of various aspects of the invention which are focused on the luminaire, or the assemblies, or the kits of parts, being of a truly modular nature. 23 04 25 In some example practical forms of such snap-fit-type first attachment means, they may comprise one or more, especially one or more pairs of or a plurality of, elongate legs extending from a wall or attachment portion of one of the light collector element and the cover 5 element, and corresponding one or more, especially one or more pairs of or a plurality of, locating holes or apertures formed in a wall or attachment portion of the other of the light collector element and the cover element. Such leg(s) may for example each include a respective locking or engagement portion, such as a detent, step, notch, hook or catch element, and such hole(s) / aperture(s) may for example each include a respective locking 10 seating, recess, edge, abutment surface or catch feature, for inter-engagement with the aforementioned corresponding snap-fit attachment feature of the respective leg. In some such embodiments, the elongate leg(s) may be provided on the cover element and the hole(s) / aperture(s) may be provided on the light collector element, although these 15 respective locations of these respective features could be reversed if desired or appropriate. Where one or more pairs of any such snap-fit-type first attachment features are provided, those respective features within each pair may be located on opposite sides of the light collector and / or the cover element, as the case may be, in order to enhance the stability and 20 secure nature of the attachment. In embodiments of the invention, in each above-defined optical cell, the cover element of each optical cell comprises: an input opening facing towards the transmission element and for receiving light 25 transmitted by the transmission element, an output opening via which light is outputted from the optical cell, and at least one internal surface defining a cavity within the cover element between its input and output openings, the cavity’s internal surface(s) being configured for allowing or effecting passage of light, or a portion of the light, through the cavity from the cover element’s 30 input opening towards its output opening. It is to be understood that in the cover element of such embodiments, in the context of the above definition of the cover element’s cavity’s internal surface(s) being configured “for allowing or effecting passage of light, or a portion of the light” through the cavity from the 35 cover element’s input opening towards its output opening, within the scope of this definition is intended to be encompassed any form of “allowing or effecting passage” of light, or any portion of the light, through the cover element’s cavity by any one or more portions of one or 23 04 25 more of the cavity’s internal surface(s). In particular any one or more of the following optical effects may be present: (i) in certain embodiments, one or more internal surfaces, or one or more portions of one or more internal surfaces, of the cavity may be configured for allowing passage or 5 propagation of light, or any portion of the light, through the cavity from the cover element’s input opening towards its output opening substantially unhindered, e.g. substantially without any interaction with or impingement or incidence on the or the respective cavity internal surface(s) or surface portion(s); (ii) in certain embodiments, one or more internal surfaces, or one or more portions 10 of one or more internal surfaces, of the cavity may be configured so as to reflect or redirect or scatter light, or any portion of the light, that interacts therewith or impinges or is incident thereon, as it is conveyed or passes or travels through the cavity from the cover element’s input opening towards its output opening; (iii) in certain embodiments, one or more internal surfaces, or one or more portions 15 of one or more internal surfaces, of the cavity may be configured so as to substantially block or prevent or absorb the passage or travel of light, or any portion of the light, through the cavity from the cover element’s input opening towards its output opening, especially that light (or a portion of it) that is so passing or travelling through the cavity at angles (relative to a central axis of the cover element) greater than or beyond one or more predetermined 20 boundary angle(s) (as discussed in further detail below); (iv) in certain embodiments, any one or more of the effects (i), (ii) and / or (iii) above may be present simultaneously, especially as or when effected by different or discrete portions of the one or more internal surfaces of the cavity or a part thereof. 25 In some of the above embodiments of the invention in its various aspects, the cover element of each optical cell may comprise any suitably shaped and / or configured frame, casing, surround or body, e.g. of a moulded plastics material, which comprises one or more internal surfaces which define and enclose the said internal cavity therewithin. 30 In some of the above embodiments the said internal cavity within the cover element may be defined by the said internal surface(s) thereof which at least partially unite with or which are at least partially contiguous with or which are at least partially continuations of the wall(s) of the body (or at least an upper portion or upper peripheral region of the body) of the light collector element, especially at least partially continuations of the internal wall(s) of the 35 chamber (or at least an upper portion or upper peripheral region of the chamber) within the light collector element when it is of the first species type. 23 04 25 In some of the above embodiments, in the cover element of each optical cell, the at least one internal surface defining the said cavity therewithin between its input and output openings may be configured at least in part not only for simply allowing unhindered passage or propagation of light through the cavity from the cover element’s input opening towards its 5 output opening - as per the defined optical effect (i) above - but also - or even alternatively -the at least one internal surface may be configured at least in part for reflecting or redirecting or scattering light incident thereon towards the cover element’s output opening - as per the defined optical effect (ii) above. 10 Alternatively or additionally still, in some other of the above embodiments - as per the defined optical effect (iii) above - the at least one internal surface of the cover element may be configured so as to substantially suppress or block or prevent (e.g. through absorption) passage or propagation through to the cover element’s output opening of light rays entering the cavity from the cover element’s input opening and which travel in directions defined by 15 angles, relative to a central (or optical) axis direction of the cover element (or relative to a normal axis of the transmission element or a central (or optical) axis direction of the light collector element), greater than one or more predetermined boundary angle(s). Such boundary angle(s) may for instance vary in different radial propagation directions relative to the said axes. 20 Alternatively or additionally to the preceding feature, in such embodiments the at least one internal surface of the cover element may be configured so as to reflect or redirect or scatter towards the cover element’s output opening light rays entering the cavity from the cover element’s input opening and which travel in directions defined by angles, relative to a central 25 (or optical) axis direction of the cover element (or relative to a normal axis of the transmission element or a central (or optical) axis direction of the light collector element), greater than one or more predetermined boundary angle(s). Such boundary angle(s) may for instance vary in different radial propagation directions relative to the said axes. 30 In the above-defined various embodiments involving one or more predetermined boundary angle(s) - which defines the maximum angle of direction of travel at which light rays entering the cavity from the cover element’s input opening are able to pass or propagate through the cavity to its output opening without being suppressed, blocked, prevented, or without being reflected or redirected or scattered back into the cavity or towards the cover element’s output 35 opening - may be selected according to the overall dimensions, shape, configuration and design of the cover element and / or of the optical cell in question. However, by way of example, in some currently envisaged practical embodiment optical cells within the scope of 23 04 25 the invention, a predetermined boundary angle of around 1 or 5 or 10 or 15 or 20 or 25 or 30 or 35 or 40 or 45 or 50 or 55 or 60 or 65 or 70 or 75 or 80 or 85 or 88 or 89° or <90°, or a boundary angle in a range between any two of the aforesaid angles, relative to a central (or optical) axis direction of the cover element (or relative to a normal axis of the transmission element or a central (or optical) axis direction of the light collector element), may be suitable. In certain embodiments, it may be possible for different such boundary angles to apply at different radial propagation directions (relative to the said axes) at which light rays may pass or propagate through the cavity and be so suppressed, blocked, prevented, or reflected or redirected or scattered back into the cavity or towards the cover element’s output opening as they propagate radially in those different respective radial propagation directions. In the preceding definitions, the “central (or optical) axis direction of the cover element” may be defined as an axis perpendicular or normal to a plane of the circuit- or wiring board upon which the optical cell in question is to be mounted, or as a normal to the plane of the input or output (or input or output openings, as the case may be) of the cover or the light collector element, or as a normal to the transmission element surfaces (or its general plane). The cover element may, as with the light collector element but independently thereof, for instance be injection-moulded from any suitable plastics material, especially any suitable polymeric material, such as a suitably selected molecular-weight and / or cross-linked variety or species of polymeric substance, examples of which are numerous and readily available in the art of plastics. For example, a polycarbonate (PC) may be one such useful material, although many other examples may also be used instead, such as any of the following: polymethylmethacrylate (PMMA), acrylonitrile-butadiene-styrene (ABS), epoxy resins, glass-reinforced plastic (especially polyester-based) (GRP), polytetrafluoroethylene (Teflon), high density polyethylene (HDPE), polystyrene (PS), high impact polystyrene (HIPS), low density polyethylene (LDPE), polypropylene (PP), melamine formaldehyde (MF), polyamides (e.g. nylons) (PE), phenolic resins (e.g. phenol formaldehyde (PF)), polyacrylonitrile (PAN), polyesters (e.g. unsaturated polyester resin (UPR)), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyvinyl chloride (PVC), unplasticized PVC (uPVC), styrene-acrylonitrile (SAN), sheet moulding compounds (SMC) (e.g. sheets of glass fibre impregnated with polyester resin), thermoplastic polyurethanes (TPU), to name but a few. As a possible alternative or addition to, although possibly it may be the same thing as, the above defined optical effect (iii) of the cover element, in some of the above embodiments - if desired or appropriate - the cover element may include one or more anti-glare features. Such features may be designed to eliminate or reduce glare when the light emitted from the optical 23 04 25 cell reaches an observer (or viewer), or to prevent or limit light emitted from the optical cell from reaching certain areas in space, or objects or surfaces, outside the optical cell. In some such embodiments, such an anti-glare feature may be constituted by one or more internal walls or surfaces of the cover element having an extended height or upward length (e.g. a 5 height at least that of the height of the light collector element or the distance between the respective light source(s) of that optical cell and a base of the cover element when the optical cell is fully assembled, or a height up to about 1.5 or 2 or 2.5 or even as much as 3 times the height of the light collector element or the distance between the respective light source(s) of that optical cell and a base of the cover element when the optical cell is fully assembled) and 10 being configured so as to have one or more internal walls or surfaces which are oriented at an angle, relative to a central (or optical) axis of the optical cell (especially an axis perpendicular or normal to a plane of the circuit- or wiring board upon which the optical cell in question is to be mounted) of >0°, especially in the range of from about 0 or 5 or 10 or 15 or 20 or 30° up to about 50 or 60 or 70 or 80°. As a result of this configuration of the internal 15 wall(s) or surface(s) of the cover element, light rays emanating from the light source associated with that optical cell and being conveyed or directed by the light collector element through the transmission element and into the cavity within the cover element (via the latter’s input opening) and towards the cover element’s output opening, at an exit angle beyond a certain maximum angle value (namely, an angle dependent on the actual aforementioned 20 wall orientation angle and / or in conjunction with the height of the cover element wall(s)) may be blocked, cut out or (at least partially) absorbed by the cover element’s wall material and thereby prevented from exiting the optical cell and causing unwanted glare. Generally in this context, in various such embodiments there may be no limit on the shape 25 of the cover element and its internal walls, which may in various cases be of any shape in two or three dimensions (or in plan or cross-section) (including flat, planar, curved, arcuate, regular, irregular, symmetrical, asymmetrical, complex-curved, conic-sectioned, etc), provided it blocks or reduces, redirects or scatters at least a portion of the light exiting the transmission element so as to reduce glare when the light emitted from the optical cell 30 reaches the observer (or viewer), or to prevent or limit light emitted from the optical cell from reaching certain areas in space, or objects or surfaces, outside the cell. To assist this, in some embodiments the inner wall(s) of the cover element may even be curved or arcuate, and / or they may be glossy to assist in their redirecting or reflection function or to help reduce scatter of residually reflected light from the wall(s). 35 By way of example, such a slope or angle of inclination away from the vertical (i.e. away from the axis direction of the optical cell) of the internal wall(s) of the cover element in the region 23 04 25 of about 20 to 30° may be suitable for blocking such exiting light rays beyond a certain angle value of, say, about 60°, which may be suitable for many anti-glare applications. However, the exact angle of slope or inclination away from the vertical (i.e. away from the axis direction of the cell) of such internal wall(s) of the cover element in any specific practical embodiment 5 of optical cell may be selected so as to suit or match the particular dimensions, shape and light distribution characteristics of the specific optical cell in question. It may be possible, in some of the above embodiment implementations of the invention, especially in the kits of the above-defined “kit” aspect, to provide a plurality of differently 10 configured cover elements for selective use singly with a single given light collector element and transmission element of a given optical cell, wherein each differently configured cover element may have a different angle of slope or inclination of its internal wall(s) / surface(s) and thus a different degree of anti-glare properties in terms of the light ray exit angle beyond which the exiting light rays are blocked. Such plural cover elements, per single given light 15 collector element and transmission element, may thus enhance the modular versatility of some embodiment kits within the scope of this aspect of the invention. In some of the above embodiments, the cover element of each optical cell may, as with the light collector element but independently thereof, have one or more internal walls or surfaces 20 - including those providing the above anti-glare feature - which are of any suitable geometrical shape when viewed in plan or in transverse cross-section. For example, a cover element with internal walls or surfaces of, or configured in, a generally substantially circular shape (when viewed in plan or in transverse cross-section) may typically be employed. However, other internal shapes are possible instead, e.g. elliptical, rectangular, square, 25 polygonal (e.g. hexagonal), etc. In some of the above embodiments the internal surface(s) defining the cavity within the cover element may be configured such that the cavity is generally substantially part-conical or frusto-conical or part-paraboloidal or part-hyperboloidal in its three-dimensional shape, 30 especially with its diameter / width increasing passing from the cover element’s input opening to its output opening. In other embodiments, however, other three-dimensional shapes of the cavity may be possible instead, by virtue of the cavity’s defining internal surface(s) being configured accordingly. Such alternative cavity shapes may for example be generally substantially cylindrical, spherical, ellipsoidal, paraboloidal, hyperboloidal, etc, or pyramidal 35 (especially inverted pyramidal) with any number of sides from 3 upwards (e.g. a pyramid with from 3 to 6 or 7 or 8 sides), or even other geometrical or polyhedral shapes. 23 04 25 As already mentioned above, in some of the above embodiments the cover element of each optical cell may include one or more, or one or more pairs of, or a plurality of, elements or components of snap-fit-type attachment means for securely attaching the cover element of the optical cell to the light collector element thereof. Such elements or components of snap-5 fit-type attachment means, e.g. one or more pairs of or a plurality of, elongate legs extending from a wall or attachment portion of the cover element (especially including a respective locking or engagement portion, e.g. a detent, step, notch, hook or catch element) may thus be as already defined above. 10 In embodiments of the invention, in each above-defined optical cell, the transmission element of each optical cell comprises: one or more planar optical elements, wherein the or each optical element includes a first surface facing towards the output of the light collector element and a second surface facing towards the input opening of the 15 cover element, and the or each optical element exhibits a predetermined optical activity or function in its transmission of light incident thereon which has exited the output of the light collector element and is transmitted by the transmission element towards the input opening of the cover element. 20 In some of the above embodiments of the invention in its various aspects, the transmission element of each optical cell may comprise at least one optically active transmission optical element, such as in the form of a generally flat or planar foil, film, sheet, web, plate, layer or other thin body of optical material exhibiting a desired optical function. That optical function 25 may be any optical function which effects or facilitates a desired distribution and / or one or more output characteristics of light emanating from the respective optical cell, such as by modifying or modulating one or more optical properties (especially directional optical properties) of the light emitted by the respective light source(s) as determined by the optical function of the respective optically active transmission element of the respective optical cell. 30 (Of course, it is within the scope of the invention, in certain embodiments, that the optical function of the transmission element may be, in effect, “zero”, such that the transmission element may not substantially alter or interfere with the natural passage of light therethrough, whereby the light from the light source(s) may pass directly to the cell’s output (optionally having been directed or redirected (e.g. reflected) from any surface or wall (which may be 35 internal or external, depending on the species type) of the body of the light collector element) via the transmission element.) 23 04 25 In many of the above embodiments the transmission element may be permeable to light, such that it transmits light incident thereon from the respective light source(s) in the respective optical cell and transmits it to the optical cell’s output, e.g. in the form of a desired ray or beam of appropriate desired direction, shape, intensity, colour and / or other light 5 property characteristics, which output will normally be via the output opening of the cover element attached to the light collector element. In many of the above embodiments the transmission element may comprise a said first surface, which is a first major face thereof, and a said second surface, which is a second 10 major face thereof, and at least one of said first and second surfaces, optionally each of said first and second surfaces, comprises or is formed with optical functional relief, especially optical functional relief of a nanometer(s) ormicrometer(s) order of size, and more especially nano- or micro-relief which displays either diffractive or refractive behaviour, ora combination of diffractive and refractive behaviour. Suitable sizes of such surface relief features may for 15 example be in the overall range of from about 0.5 or 1 nm up to about 500 pm, with suitable sizes of such surface nano-relief features being for example in the range of from about 0.5 or 1 nm up to about 500 nm, e.g. from about 1 or 2 or 3 nm upto about 10 or 20 or 50 or 100 or 250 nm, and / or suitable sizes of such surface micro-relief features being for example in the range of from about 0.5 or 1 pm up to about 500 pm, e.g. from about 1 or 2 or 3 pm up 20 to about 10 or 20 or 50 or 100 or 250 pm. Specific examples of surface nano-scale and / or micro-scale optical functional relief, and techniques for how to create or apply it to a variety of optical substrate materials - such as various embossing processes - are all widely known in the art of optics, especially micro-25 optics and holography, and will be within the general skill and knowledge of the skilled person. For use in above embodiments of the invention, suitable substrate materials for use in forming the transmission element may include various plastics or polymeric materials, such 30 as polycarbonates, UV-curable polymers, acrylic polymers, or alternatively a glass. Alternatively still, plural-layer such transmission elements may instead be used, if that is appropriate, and such plural layers may each independently comprise a substrate material of any of the foregoing materials. Moreover, any one or more of, or even each of, such plural layers in a plural-layer transmission element structure may be provided with an optically 35 functional relief pattern. The nano- or micro-structure may be directly formed in the substrate material or on its 23 04 25 surface, e.g. by molding or embossing or UV-curing or an etching process, or it may be formed in a different material which is then attached to the substrate material via any suitable means or method, e.g. by UV-curing a curable polymer on a glass or plastic substrate and then laminating or gluing the structured material (or film) to the substrate surface. 5 Die-cutting or any other suitable known technique (e.g. laser cutting, slitting, etc) may for example be used to form any desired shape and size of the transmission element. Transmission element shapes being generally substantially rectangular or square may be typical, although other shapes (e.g. circular, elliptical, polygonal, etc) may be possible. The 10 exact shape of the transmission element in any given embodiment may depend on the overall plan (or transverse-sectional) shape and dimensions of the other optical cell components, i.e. the light collector element and the cover element. In many of the above embodiments the or each planar optical element of the transmission 15 element may be of substantially uniform or constant thickness. Suitable thicknesses of the substrate material for forming the or each optical element of the transmission element may be in the range of from about 1 or 5 or 10 or 20 or 30 or 40 or 50 or 100 upto about 300 or 400 or 500 or 800 or 1000 pm, e.g. around 250 pm in some practical 20 example embodiments. If desired or appropriate, the transmission element may be cut or shaped to include any suitable number of peripheral indents, notches, recesses, channels, or cut-outs, for the purpose of accommodating and allowing to extend therepast any elements or components 25 of snap-fit-type attachment means, e.g. one or more (or any plurality of) elongate legs, that extend between the cover element and the light collector element for the purpose of attaching those two elements together, especially with the transmission element securely and stably trapped or clamped therebetween. 30 Thus in many practical above embodiments of optical cells used in embodiments of the invention, once the cover element has been attached to the light collector element, the transmission element may be stably and securely mounted therebetween by virtue of being trapped or clamped between those two elements, especially by means of respective clamping surfaces (or surface portions), walls (or wall portions) or abutment features on the 35 respective cover element and light collector element. If desired or appropriate, in optical cells used in embodiments of the invention, any optical 23 04 25 cell may incorporate one or more auxiliary optical elements or components, e.g. one or more lenses, diffusers, micro- or nano-structured elements or films or foils, or glare reduction elements etc, which may also play a part in defining the overall final light output of the respective optical cell, such as by modifying or modulating one or more optical properties of 5 light emitted by the respective light source(s) and passing to the optical cell’s output, as determined by an optical function of the respective auxiliary optical element(s) / component(s) of the respective optical cell. Such one or more auxiliary optical elements / components may, if provided, be mounted between the light collector element and the cover element, e.g. adjacent the transmission element, or attached directly (or indirectly) to the light collector 10 element or the cover element. In many embodiments of the invention in its broadest sense and in its various aspects, the configuring element may comprise, or may be in the form of, a sheet, plate or film, especially a sheet, plate or film of substantially uniform thickness. In some such embodiments the 15 sheet, plate or film may be substantially planar or flat. Alternatively in other embodiments the sheet, plate or film may be curved or arcuate in three dimensions (or it may be formable into such a curved or arcuate shape), e.g. so as to conform to any desired geometric shape function. 20 Typical thicknesses of the sheet, plate or film material may for example be in the approximate range of from about 0.2 or 0.3 or 0.4 or 0.5 or 1 up to about 3 or 4 or 5 mm. Suitably the configuring element may for example be die-cut (or alternatively prepared by means of sawing, machining, laser-cutting or water-jet-cutting) from a stock sheet, plate or film of the relevant material, the die-cutting being such as to form the required shape and configuration 25 of the configuring element with the predetermined pattern or arrangement of apertures actually formed therein. In some such embodiments the sheet, plate or film may be of a sufficient thickness, and / or formed of a suitable material, such that the sheet, plate or film is of sufficient strength and 30 rigidity so as to be able to substantially hold its own shape in space, especially as a flat planar shape or alternatively as an arcuate or curved-in-three-dimensions shape, i.e. in either case without significant bending or distortion, and also so as to provide a substantially rigid and firm mounting for the various optical cells received in the apertures therein. 35 Alternatively in other embodiments the sheet, plate or film may have a small or medium degree or amount of flexibility and / or resilience, e.g. in order to be able to adopt or conform to a desired non-planar, e.g. arcuate or curved-in-three-dimensions, shape or configuration 23 04 25 when mounted within the body or frame of the luminaire. In certain embodiments, for example when the configuring element is made from metal or metal alloy (e.g. sheet metal / alloy), the non-planar shape may be achieved by preforming the sheet into the desired form or configuration by any suitable known method. 5 In many typical embodiments the material of the configuring element may be, or may comprise, a plastics material, especially any suitable polymeric material, such as a suitably selected molecular-weight and / or cross-linked variety or species of polymeric substance, examples of which are numerous in the art of plastics. The polymer may for instance be or 10 comprise a thermoplastic or thermosetting polymer. By way of example, some suitable polymeric materials, which may be used either singly or any combination, may include any of the following: polycarbonates (PC), polymethylmethacrylate (PMMA), acrylonitrile-butadiene-styrene (ABS), epoxy resins, glass-reinforced plastic (especially polyester-based) (GRP), polytetrafluoroethylene (Teflon), high density polyethylene (HDPE), polystyrene (PS), 15 high impact polystyrene (HIPS), low density polyethylene (LDPE), polypropylene (PP), melamine formaldehyde (MF), polyamides (e.g. nylons) (PE), phenolic resins (e.g. phenol formaldehyde (PF)), polyacrylonitrile (PAN), polyesters (e.g. unsaturated polyester resin (UPR)), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyvinyl chloride (PVC), unplasticized PVC (uPVC), styrene-acrylonitrile (SAN), sheet moulding 20 compounds (SMC) (e.g. sheets of glass fibre impregnated with polyester resin), thermoplastic polyurethanes (TPU), to name but a few. Alternatively the material of the configuring element may be a metal or a metal alloy (e.g. aluminium or an aluminium alloy). Any suitable known manufacturing and / or processing 25 techniques may be used for such metallic configuring elements’ production, such as forming (e.g. sheet forming), and / or machining production methods. In many practical embodiments the material of the configuring element may be an optically inactive material, meaning that the material substantially does not perform or exhibit any 30 significant degree of optical functionality of the nature of diffraction, refraction or other modification of the wavelength, phase, directional or intensity characteristics of transmitted or reflected light passing through or incident on the configuring element. Thus, in such practical embodiments the material of the configuring element may substantially not contribute in any significant way to the overall optical functionality of each optical cell of the 35 arrangement, assembly or luminaire. In some embodiments the configuring element may comprise alignment means for defining 23 04 25 and / or facilitating appropriate or correct positioning and / or orientation of the configuring element, or the arrangement or assembly comprising it (together with the respective optical cell(s), in the body or frame of the luminaire into which it is, or is to be, incorporated. Such alignment means may for example comprise any suitable number of (e.g. one, two, three, 5 four, five, six, or possibly even more than six) and spatial or configurational arrangement of lugs, tabs, wings, flanges, ribs, collars, detents, pins, protrusions, holes, recesses, channels, grooves, notches, etc, which may for example (especially in the case of a plurality thereof) be located on opposite or opposed or spaced-apart sides or portions of the configuring element. 10 In practical embodiments of the invention in its various aspects, each aperture in the configuring element may be shaped and / or configured to receive therein a respective one of the optical cells. At least part of the defining wall(s) of each aperture in the configuring element may substantially geometrically match or duplicate the external shape of at least 15 part of the respective optical cell - such as, in particular, at least part of the respective light collector element or cover element - especially so that the respective optical cell may be retained in its respective aperture in the configuring element by means of a simple friction fit. Alternatively, in other embodiments, each optical cell may be receivable and securable in its respective aperture in the configuring element by virtue of respective securement, retention 20 or locking means, e.g. one or more locking detents, clips, pins, lugs, hooks or other suitable mechanical securement / retention / locking elements or devices. In accordance with the invention, at least part of the defining wall(s) of each mounting aperture in the configuring element, together with at least part of an external wall of a 25 respective optical cell to be received therein (such as, in particular, at least part of an external wall of the respective light collector element or cover element of the respective optical cells), collectively comprise respective orientation means for effecting reception of the respective optical cell in the respective aperture in any selected one of one or two ora plurality of specific discrete or fixed possible orientations relative to each other. Such one or two or more 30 possible orientations may for instance be defined by the rotational symmetry of the respective optical cell. Such orientation means may for example comprise any suitable number of, especially any suitable number of pairs of, mutually inter-engageable inter-engagement elements or features provided on each of the external wall of the respective optical cell and the defining interior wall(s) of the respective aperture. Practical examples of such orientation 35 means may include any suitable number, positioning and spatial arrangement of inter-engageable lugs, tabs, wings, flanges, ribs, collars, detents, pins, protrusions, holes, recesses, channels, grooves, notches, etc. 23 04 25 Furthermore, in some embodiments of the invention each optical cell may further comprise attachment means, or a component of attachment means, for mechanically and securely -and optionally also removably - attaching the respective optical cell to the configuring 5 element. Such attachment means, or component of such attachment means, that is provided on the respective optical cell may be provided thereon externally thereof. Such attachment means may take any of various forms: For example, each attachment means may comprise, as already mentioned above, a simple friction-fitting engagement 10 between an outer wall of (e.g. an outer wall of a lower or an upper portion of) the respective optical cell and the defining wall(s) of a respective mounting aperture in the configuring element. Alternatively each attachment means may comprise one or more, especially one or more 15 pairs of or a plurality of, snap-fit connection or docking elements provided on the respective optical cell which is / are inter-engageable in a snap-fit manner with one or more corresponding snap-fit connection or docking elements provided on the configuring element. The one or more corresponding snap-fit connection or docking elements provided on the configuring element may be provided adjacent a respective mounting aperture in the 20 configuring element into which the respective optical cell is to be mounted. In some example practical forms of such snap-fit-type attachment means, they may comprise one or more, especially one or more pairs of or a plurality of, legs, pins, spigots or protrusions extending from a lower wall or lower attachment portion of the respective optical cell, and corresponding one or more, especially one or more pairs of or a plurality of, locating holes, apertures or 25 recesses formed in the configuring element, especially formed therein adjacent the respective mounting aperture therein into which the respective optical cell is to be mounted. Such leg(s) / pin(s) / spigot(s) / protrusion(s) may for example each include a respective locking or engagement portion, such as a detent, step, notch, hook or catch element, and such hole(s) / aperture(s) / recess(es) may for example each include a respective locking seating, 30 recess, edge, abutment surface or catch feature, for inter-engagement with the aforementioned corresponding snap-fit attachment feature of the respective leg / pin / spigot / protrusion. In some such embodiments, the leg(s) / pin(s) / spigot(s) / protrusion(s) may be provided on the respective optical cell and the hole(s) / aperture(s) / recess(es) provided on the configuring element, whereas in alternative 35 such embodiments the locations of these respective snap-fit docking components may be reversed so that the leg(s) / pin(s) / spigot(s) / protrusion(s) are provided on the configuring element and the hole(s) / aperture(s) / recess(es) are provided on the respective optical cell. 23 04 25 Further alternatively each attachment means may comprise a mechanically simpler dockingtype inter-engagement, in which each one of the respective optical cell and the configuring element is provided with a respective one of a pair of mutually inter-engageable detents, 5 hooks, catches, clips or other docking inter-engagement elements, whose mechanical interengagement together effects the docking inter-engagement of the respective optical cell and the configuring element Plural such pairs of mutually inter-engageable docking elements may be provided, if desired or appropriate, e.g. located on opposite sides of the respective optical cell and adjacent opposite sides of the respective mounting aperture in the configuring 10 element, for enhancing the security and stability of the docking mounting of the respective optical cell on the configuring element. Yet further alternatively still, each attachment means may comprise one or more, especially a plurality of or one or more pairs of, snap-fit or click-in or other interconnection or docking 15 or hooking or locking elements provided on the respective optical cell alone (or even on the configuring element alone), e.g. in a form of a sprung hook device which when pushed through an aperture in the configuring element, springs out and catches the edge of the aperture in a locking manner. Other types of such snap-fit or click-in or docking / hooking / locking devices or element may of course be possible. 20 In some embodiments each optical cell may be readily removable from its respective aperture in the configuring element, such as for the purpose of dismantling of the arrangement / assembly / luminaire for any reason or for the replacement or repair of any of its components. Alternatively, in other embodiments, each optical cell may be substantially non-25 removable from its respective aperture in the configuring element, i.e. it may be substantially permanently mounted therein. In embodiments of the invention in its various aspects, the configuring element comprises a plurality of the said mounting apertures, and the apertures may be arranged or mutually 30 configured across the area of the configuring element, especially across at least a central region of the configuring element, in any suitable or desired pattern, distribution or geometric arrangement, such as for instance as may be dictated by the final desired arrangement of the various light sources in the various optical cells in the light-emitting area(s) / region(s) of the final complete luminaire’s design. For example, the apertures in the configuring element 35 may be spatially distributed across the configuring element (or across a central region thereof) in one or more linear, polygonal, rectangular, hexagonal, radial, circular, spiral, or even randomized arrangements. Generally however the exact spatial arrangement of the 23 04 25 apertures may be dictated by the overall design of the finished complete luminaire. Furthermore, in practising some embodiments of the invention in its various aspects, the plurality of apertures, and thus the plurality of light sources, may be spatially and / or 5 functionally arranged in or on the configuring element in a plurality of discrete groups, series, clusters or arrays. By “spatially arranged in a plurality of discrete groups / series / clusters / arrays” in this context is meant that one or more individual such groups, series, clusters or arrays is / are located in a or a respective discrete section or region of the configuring element which is different from or spaced apart from the other section(s) 10 or region(s) of the configuring element in which is / are located the other group(s), series, cluster(s) or array(s). By “functionally arranged in a plurality of discrete groups / series / clusters / arrays” in this context is meant that one or more individual such groups, series, clusters or arrays is / are either (i) operable independently of one or more of the other groups, series, clusters or arrays, and / or (ii) designed and / or constructed to exhibit 15 different lighting characteristics and / or different optical functions from one or more of the other groups, series, clusters or arrays. In embodiments designed with this “functional” independence between plural groups, series, clusters or arrays, appropriate control over the individual groups’, series’, clusters’ or arrays’ operation may be effected by appropriate switching and / or electronic control means. By providing the various plural yet spatially and / or 20 functionally discrete groups, series, clusters or arrays of apertures / light sources in this manner, greater flexibility and variation in the overall optical functionality, lighting characteristics and aesthetics of the complete luminaire may be achievable, which may add to the overall design versatility of luminaires in accordance with the present invention. 25 In any given embodiment of the invention in its various aspects, the number of optical cells may be up to the same number as, or may be less than, the number of mounting apertures in the configuring element. Thus, in some embodiments of the invention in its various aspects, substantially all of the apertures in the configuring element may each have a respective optical cell received therein. However, in other embodiments, still within the scope 30 of the invention, it may be possible for one or more of the apertures in the configuring element to be empty and not have a respective optical cell received therein. Such latter embodiments may be particularly useful for example in the provision of certain designs of modular luminaires in the form of kits which may have enhanced versatility by virtue of the configuring element being made and provided in a single given design but is able to be combined with 35 various different numbers of optical cells, so that a range of different complete luminaires may be constructable having a wider range of final designs or brightnesses or other lighting characteristics, whilst the number of different versions of the overall kit components is kept 23 04 25 to a minimum. Within the scope of this specification it is envisaged that the various aspects, embodiments, examples, features and alternatives, and in particular the individual constructional or 5 operational features thereof, set out in the preceding paragraphs, in the claims and / or in the following description and accompanying drawings, may be taken independently or in any combination of any number of same. For example, individual features described in connection with one particular embodiment are applicable to all embodiments, unless expressly stated otherwise or such features are incompatible. 10 BRIEF DESCRIPTION OF THE DRAWINGS Various embodiments of the present invention in its various aspects will now be described in detail, by way of example only, with reference to the accompanying drawings, in which: 15 FIGURE 1 is a generalised perspective view of an arrangement for forming into a luminaire, in accordance with one embodiment of the invention; FIGURE 2 is an exploded generalised perspective view of the arrangement of FIG. 1, illustrating the manner in which the array of optical cells and the configuring element are brought together so that the respective optical cells are received in the respective mounting 20 apertures of the configuring element; FIGURE 3 is a more detailed perspective view of part of the arrangement of FIGS. 1 and 2, but showing a key feature of the invention, where in each optical cell’s means of mounting in the configuring element a pair of interengagement features are included in order to fix the respective optical cell in a unique rotational orientation relative to its respective 25 mounting aperture in the configuring element; FIGURE 4 is a perspective view of a modified form of configuring element, similar to that shown in the arrangement of FIG. 1, but of an alternative shape in which the configuring element includes various mounting and orientation / alignment features to assist its correct and stable mounting in a luminaire body or frame; 30 FIGURE 5 is a side-on sectional view of a circuit or wiring board on which are pre mounted the various LEDs of the luminaire, showing the manner in which the LED board is brought together with the optical cells+configuring element arrangement in the formation of the complete luminaire; FIGURE 6 is a perspective view of another arrangement for forming into a luminaire, 35 in accordance with another embodiment of the invention, in which the configuring element and the resulting array of optical cells is curved or arcuate in shape, instead of flat / planar; FIGURE 7 is a plan view of yet another arrangement for forming into a luminaire, in 23 04 25 accordance with yet another embodiment of the invention, in which a hexagonal configuring element (as just one example of a possible polygonal shape thereof) is employed for accommodating an array of a larger number of compact optical cells, each optical cell being of a more advanced practical design that further enhances the modular nature of the 5 luminaire-building system; FIGURE 8 is a perspective view of the arrangement of FIG. 7, in which the optical cells are in the process of being inserted into the respective mounting apertures in the configuring element; FIGURE 9 is an enlarged side-on sectional view of part of the arrangement shown in 10 FIGS. 7 &8, showing more clearly the manner in which each optical cell is mounted in its respective mounting aperture in the configuring element, and how a circuit board on which are pre-mounted the various LEDs is then brought together with the optical cells+configuring element arrangement in the formation of the complete luminaire; and FIGURE 10 is a perspective view of the alternative embodiment of the invention, in 15 the form of a sub-assembly prior to its being mounted in a luminaire body or frame, the subassembly comprising a circuit or wiring board carrying the relevant LEDs, with a configuring element attached to the board via standoffs, and the cell mounting apertures in the configuring element being in the process of being populated with optical cells. 20 DETAILED DESCRIPTION OF EMBODIMENTS Embodiments of the present invention provide a modular system of components for use in constructing luminaires, and are based on the use of a non-optically-active low-cost configuring element for arranging optical cells into arrays of various shapes, sizes and 25 layouts, whilst keeping the optical cells together as a stand-alone multi-element arrangement of optics before being installed onto a LED-containing circuit or wiring board or into a luminaire body or frame. Each optical cell may comprise one or more LEDs, and optionally also one or more auxiliary optical elements - such as one or more transmission elements (with a predetermined optical activity or function, such as from nano-scale optical functional 30 relief on one or more faces / surfaces of the transmission element, in its transmission of light incident thereon as the light is conveyed or propagates through the optical cell from the respective light source to the cell’s output), reflectors, lenses, diffusers, micro- or nanostructured elements or films or foils, glare reduction elements, etc - whereby the overall assemblage of optical components can representor be assembled into individual optical cells 35 each being designed and configured to redistribute light from each respective light source (LED), and from the light sources (LEDs) collectively, into a desired final output light distribution of the complete, finished luminaire. Within luminaires according to embodiments 23 04 25 of the invention, therefore, the optical cells can be spatially distributed according to the luminaire’s design. They can form any type of regular or irregular arrangement, such as linear, rectangular, hexagonal, radial, randomized etc. 5 Referring firstly to FIGS. 1 and 2, here there is shown in general terms one embodiment arrangement 1 for forming into a luminaire, comprising an array of optical cells 10, each optical cell 10 including a housing or body 14 (attached to which is a cover element 15 - see FIG. 3) for containing or having inserted or mounted or positioned therein, thereon or thereadjacent - e.g. in or adjacent a chamber therewithin which is accessible via a lower hole 10 or aperture 19 - a respective LED 32, which LEDs 32 will usually be provided pre-mounted on a circuit board or wiring board 30 (as shown in FIG. 5). The optical cells 10 are arranged and held in a predetermined relative configuration or pattern by virtue of each being received and held in a respective mounting aperture 22 of a configuring element 20, which is in the form of a die-cut flat sheet or plate of a suitably strong and rigid plastics material. Typically 15 the apertured flat sheet or plate has a thickness of around 1 to 2 mm, although its exact optimum thickness may depend on the material from which it is formed. Each optical cell 10 is mounted securely in its respective aperture 22 in the configuring element 20 by virtue of a simple friction fit, owing to the matching size and shape of the interior walls defining each aperture 22 and the exterior shape and dimensions of each optical cell’s housing or body 14. 20 Alternatively any suitable form of snap-fit or click-in docking arrangement could be used instead for securely - and possibly also removably - mounting each respective optical cell housing / body 14 in a respective mounting aperture 22 of the configuring element 20. As shown in further detail in FIG. 3, in a particularly useful arrangement according to the 25 invention, the mounting of each optical cell 10 in its respective aperture 22 of the configuring element 20 comprises a pair of interengageable elements in the form of a lug or tab 18 provided on an exterior upper wall portion 16 of the respective cell housing / body 14 and a notch or recess 28 formed in an interior wall portion of the respective aperture 22 of the configuring element 20. These mounting lug / tab 18 and notch / recess 28 features thus 30 enable each respective optical cell 10 to be fixed in a unique rotational orientation relative to its respective aperture 22 in the configuring element 20. FIG. 4 shows a modified form of configuring element 20, similar to the simpler form thereof shown in FIGS. 1 to 3, but in which the configuring element 20 includes a series of mounting 35 holes 27, for locating on respective corresponding / matching mounting pins or spigots (not shown) provided at appropriate locations on the luminaire body or frame, and a pair of oppositely arranged or diametrically spaced-apart locating tabs or wings 24, for location in 23 04 25 corresponding recesses or notches at appropriate locations on the luminaire body or frame. Thus, together the various mounting holes 27 and locating tabs / wings 24 constitute alignment and orientation features for assisting the correct and stable mounting of the configuring element 20, with its optical cells 10 mounted thereon, in the luminaire body or 5 frame. FIG. 5 shows an example of a circuit board or wiring board 30 on which are pre-mounted, in a conventional manner, an array of the LEDs 32 which are arranged in the appropriate same, matching or corresponding predetermined pattern or arrangement as the optical cell 10 mounting apertures 22 in the configuring element 20. Thus, as the board 30 is brought together (as represented by the arrow in FIG. 5) with the arrangement of optical cells 10 carried on the configuring element 20, the respective LEDs are able to protrude through - or to protrude just into or to come to be positioned immediately adjacent (i.e. just outside or just inside) the mouth of - the respective lower holes 19 in the respective optical cell 15 housings / bodies 14, and in some case into (or a short distance into) the respective chambers therewithin, so as to adopt their appropriate correct and final positionings within each respective optical cell for completing the assembly for formation into the final luminaire. Although in many embodiments of luminaire according to the invention the overall 20 arrangement or assembly of optical cells 10 carried on the configuring element 20 will be substantially flat or planar, as shown in FIGS. 1 - 5 and 7 - 9, it is possible in other embodiments for it to be arcuate or otherwise curved in space, so that the overall final arrangement is substantially non-planar. One such example embodiment is shown in FIG. 6, where the alternative configuring element 120 is curved or arcuate in cross-section and 25 thus the individual circuit or wiring board elements 60 on which are mounted the respective LEDs form a generally curved or arcuate arrangement for forming into the final luminaire. Alternatively one or more inherently flexible circuit or wiring boards, or circuit / wiring board elements, could be used instead. 30 FIG. 7 shows yet another example embodiment arrangement 201 for forming into a luminaire, in which a hexagonal configuring element 220 is employed for accommodating a symmetrical array of a larger number of compact optical cells 210, each optical cell 210 being of a more advanced practical design that further enhances the modular nature of the luminaire-building system. FIG. 8 shows those optical cells 210 in the process of being inserted into the 35 respective mounting apertures 222 in the configuring element 220, and fixed therein by appropriate means such as gluing or a snap-in or click-in docking mechanism. FIG. 9 shows more clearly and in greater detail the manner in which each optical cell 210 is mounted in its 23 04 25 respective aperture 222 in the configuring element 220, and how a circuit board 30 on which are pre-mounted the various LEDs 32 is then brought together with the optical cells 210 + configuring element 220 arrangement in the formation of the complete luminaire. 5 As shown in FIG. 9, in this more advanced practical design of each optical cell 210, each cell 210 comprises an upper cover element 215 and a light collector element 214, with the internal walls of the light collector element 214 forming a chamber therewithin for collecting and redirecting light, e.g. by internal reflection, through the optical cell 210 from the respective LED 32 to the optical cell’s output defined by the upper open mouth of the cover element 10 215. Typically, securely mounted internally within the optical cell 210, between the light collector element 214 and the cover element 215 is a transmission element 216, which has a predetermined optical activity or function (such as from nano-scale or micro-scale optical functional relief on one or more faces / surfaces thereof) in its transmission of light incident thereon as the light is conveyed or propagates through the optical cell 210 from the 15 respective LED 32 to the cell’s output. If desired or appropriate to any given practical example embodiment, in addition to any transmission element 216, there may optionally additionally be included within the optical cell 210, especially within any one or more components of the optical cell 210 (in particular either 20 or both of the light collector element 214 and / or the cover element 215) any suitable arrangement of one or more auxiliary optical elements, e.g. one or more lenses, diffusers, micro- or nano-structured elements or films, or glare reduction elements etc, which may also play a part in defining the overall final light output of the respective optical cell 210, such as by modifying or modulating one or more optical properties of light emitted by the respective 25 LED 32 as it passes or propagates or is conveyed through the optical cell 210, as determined by the optical function(s) of the respective auxiliary optical element(s), optionally in combination with the optical function of any transmission element 216 present. FIG. 10 shows an example of an alternative embodiment of the invention being implemented 30 in practice. As just one example of one of the kinds of assemblies or sub-assemblies that may be used to from final luminaires, here there is shown a sub-assembly 300 prior to its being mounted in a luminaire body or frame, the sub-assembly 300 comprising a circuit or wiring board 30 carrying the relevant LEDs 32 thereon, with an apertured configuring element 320 attached to the board 30 via standoffs or spacers 340, and the cell mounting apertures 35 322 in the configuring element 320 being in the process of being populated with optical cells 310. 23 04 25 Especially in the case of embodiment modular arrangements such as that shown in FIGS. 7 to 10 which include a plurality of LEDs 32 finally mounted in a plurality of apertures 222 in the configuring element 220, such modular systems may have an advantage in that they may be readily designed so as to have a plurality of different optical cells or groups, series, 5 clusters or arrays of optical cells combined into a single given luminaire arrangement, with each optical cell or group / series / cluster / array thereof performing a different optical function, such as collimation (i.e. operating as a spot light) or formation of a wide light cone (i.e. operating as a flood light), and these different functions may be switchable by turning on and off certain groups of LEDs on the board. Additionally, the overall outer shapes and sizes of 10 the optical cells may be the same, despite individual optical cells having different optical functionalities. This is just one simple example of a multifunctional luminaire. Other examples could perform other differing optical functions as between different optical cells or groups / series / clusters / arrays of optical cells, for example colour mixing functions or sequential or cycling operations. 15 Indeed, a wide variety of different designs of such “multi-functional” luminaires may be practised by use of the modular luminaire system of the invention, with its unique configuring element that defines the basic spatial arrangement of discrete optical cells than can then be used to design and build luminaires in a modular fashion with various spatial and / or functional 20 arrangements (these terms being as defined hereinabove) of their constituent optical cells. Thus, with appropriate design of the modular system luminaires may be designed and created with a wide range of optical functions and overall optical characteristics, thereby giving luminaire designers a wide range of options for how to configure many different 25 luminaire products, which may for example be customized according to specific needs of an end customer. Throughout the description and claims of this specification, the words “comprise” and “contain” and linguistic variations of those words, for example “comprising” and “comprises”, 30 mean “including but not limited to”, and are not intended to (and do not) exclude other moieties, additives, components, elements, integers or steps. Throughout the description and claims of this specification, the singular encompasses the plural unless expressly stated otherwise or the context otherwise requires. In particular, 35 where the indefinite article is used, the specification is to be understood as contemplating plurality as well as singularity, unless expressly stated otherwise or the context requires otherwise. Throughout the description and claims of this specification, features, components, elements, integers, characteristics, properties, compounds, chemical moieties or groups described in conjunction with a particular aspect, embodiment or example of the invention are to be 5 understood to be applicable to any other aspect, embodiment or example described herein unless incompatible therewith or expressly stated otherwise. 23 04 25 23 04 25

Claims

1. An arrangement for forming into a luminaire, the arrangement comprising:a plurality of optical cells each including means for receiving, collecting and 5 redistributing light from a respective one of a plurality of light sources; anda configuring element for accommodating, or accommodating, the plurality of optical cells in a predefined spatial arrangement or relative configuration or pattern, the configuring element comprising a sheet or plate or film of material having a plurality of apertures therein, at least some of which apertures are in the predefined spatial arrangement or relative 10 configuration or pattern, each aperture being configured for receiving therein, or being configured for and each of some or all of them having received therein, a respective one of the optical cells, and at least part of defining wall(s) of each aperture in the configuring element substantially geometrically matching or duplicating an external shape of at least part of the respective optical cell for being received therein,15 wherein at least part of the defining wall(s) of each aperture, together with at leastpart of an external wall of a respective optical cell to be received therein, collectively comprise respective orientation means for effecting reception of the respective optical cell in the respective aperture in any selected one of one or two or a plurality of specific discrete or fixed possible orientations relative to each other;20 and wherein each optical cell comprises:(i) a light collector element,(ii) a cover element attached to the light collector element, and(iii) a transmission element mounted between the light collector element and the cover element;25 wherein:(iv) the light collector element comprises a body including:an input for receiving and collecting light from at least one light source,an output for propagating collected light towards the transmission element,at least one wall defining one or more portions of the body between its input 30 and output and configured for collecting light entering the body via its input and conveying or directing said light towards its output, andattachment means for mechanically attaching the body of the light collector element to the cover element and securing the transmission element between the light collector element and the cover element;35 (v) the cover element comprises:an input opening facing towards the transmission element and for receiving light transmitted by the transmission element,23 04 25an output opening via which light is outputted from the optical cell, andat least one internal surface defining a cavity within the cover element between its input and output openings, the cavity’s internal surface(s) being configured for allowing or effecting passage of light, or a portion of the light, through the cavity from the 5 cover element’s input opening towards its output opening; and(vi) the transmission element comprises:one or more planar optical elements,wherein the or each optical element includes a first surface facing towards the output of the light collector element and a second surface facing towards the input opening 10 of the cover element,and the or each optical element exhibits a predetermined optical activity or function in its transmission of light incident thereon which has exited the output of the light collector element and is transmitted by the transmission element towards the input opening of the cover element.

152. An arrangement according to claim 1, wherein:the plurality of light sources are present or have been mounted or positioned or otherwise included in or on or adjacent the respective optical cells of the arrangement, and the cells have been received in respective ones of some or all of the apertures of the 20 configuring element,whereby each optical cell can receive and collect light from a respective said light source; andthe configuring element accommodates or carries the optical cells in the predefined spatial arrangement or relative configuration or pattern by virtue of each of some or all of the 25 apertures of the configuring element having received therein a respective one of the optical cells.

3. An arrangement according to claim 2, wherein the arrangement further comprises at least one circuit board or wiring board, or at least one portion of a circuit board or wiring 30 board, having the light sources mounted, or pre-mounted, thereon in the predefined spatial arrangement or relative configuration or pattern.

4. An arrangement according to claim 2 or claim 3, wherein each light source of the plurality of light sources comprises one or more LEDs (light emitting diodes).

355. An arrangement according to any one of claims 2 to 4, wherein:either (i) each one of the light sources comprises a single LED or other light emitting23 04 25device, whereby each optical cell comprises, or has mounted or positioned therein or thereon or thereadjacent, or is for having mounted or positioned therein or thereon or thereadjacent, a single LED or other light emitting device;or (ii) each one of the light sources comprises a plurality of LEDs or other light 5 emitting devices, in the form of an array, cluster, series or group thereof, whereby each optical cell comprises, or has mounted or positioned therein or thereon or thereadjacent, or is for having mounted or positioned therein or thereon or thereadjacent, an array, cluster, series or group of a plurality of LEDs or other light emitting devices.10 6. An arrangement according to any one of claims 2 to 5, wherein the light sources inthe predefined spatial arrangement or relative configuration or pattern which are used to form the luminaire are mounted or arranged on at least one circuit board or wiring board, or at least one portion of a circuit board or wiring board, in substantially a single common plane, by virtue of being mounted on a single common planar circuit board or wiring board, or a 15 single common planar portion of either thereof, or a plurality of individual circuit board or wiring board elements each lying in a common plane.

7. An arrangement according to any one of claims 2 to 5, wherein the light sources inthe predefined spatial arrangement or relative configuration or pattern which are used to form 20 the luminaire are mounted or arranged either:(i) on a single common circuit board or wiring board, or a single common portion of either thereof, which is shaped or configured in a substantially non-planar, or arcuate or otherwise curved in three dimensions, shape or configuration, or(ii) on a plurality of individual circuit board or wiring board elements which are 25 collectively arranged or configured relative to each other so as to form a substantially non-planar, or arcuate or otherwise curved in three dimensions, shaped or configured circuit board / wiring board arrangement.

8. An arrangement according to any preceding claim, wherein the plurality of light 30 sources are provided in the form of at least one circuit board or wiring board, or at least one portion of a circuit board or wiring board, having the light sources already mounted thereon, the arrangement of the light sources thereon being the same as, or corresponding to, or matching, or being synchronized with, the predefined spatial arrangement or relative configuration or pattern of those of the apertures in the configuring element that are in the 35 said predefined spatial arrangement or relative configuration or pattern.

9. An arrangement according to any preceding claim, wherein the configuring element23 04 25comprises, or is in the form of, a sheet, plate or film of substantially uniform thickness.

10. An arrangement according to claim 9, wherein:either (i) the sheet, plate or film is substantially planar or flat;5 or (ii) the sheet, plate or film is curved or arcuate in three dimensions, or it can beformable into such a curved or arcuate shape.

11. An arrangement according to claim 9 or claim 10, wherein the sheet, plate or film material has a thickness in the range of from 0.2 or 0.3 or 0.4 or 0.5 or 1 up to 3 or 4 or 5 10 mm.

12. An arrangement according to any one of claims 9 to 11, wherein the sheet, plate or film is of a sufficient thickness, and / or formed of a suitable material, such that the sheet, plate or film is of sufficient strength and rigidity so as to be able to substantially hold its own shape 15 in space, either as a flat planar shape or alternatively as an arcuate or curved-in-three-dimensions shape, and in either case without significant bending or distortion.

13. An arrangement according to any preceding claim, wherein the material of the configuring element comprises a plastics material, or a thermoplastic or thermosetting 20 polymeric material, or a metal or metal alloy.

14. An arrangement according to any preceding claim, wherein the material of the configuring element is an optically inactive material, whereby it substantially does not perform or exhibit any significant degree of optical functionality of the nature of diffraction, refraction 25 or other modification of the wavelength, phase, directional or intensity characteristics of transmitted or reflected light passing through or incident on the configuring element, and whereby it substantially does not contribute to the overall optical functionality of the optical cells of the arrangement.30 15. An arrangement according to any preceding claim, wherein the configuring elementcomprises alignment means for defining and / or facilitating appropriate or correct positioning and / or orientation of the configuring element, or an arrangement or assembly comprising it, in a body or frame of the luminaire into which it is, or is to be, incorporated.35 16. An arrangement according to any one of claims 1 to 15, wherein each optical cell isreceivable and securable in a respective aperture in the configuring element by virtue of a friction fit.23 04 2517. An arrangement according to any one of claims 1 to 15, wherein each optical cell is receivable and securable in a respective aperture in the configuring element by virtue of respective securement, retention or locking means.

518. An arrangement according to any preceding claim, wherein each said orientation means comprises a number of pairs of mutually inter-engageable inter-engagement elements or features provided on each of an external wall of a respective optical cell and the defining interior wall(s) of a respective aperture.1019. An arrangement according to any preceding claim, wherein each optical cell further comprises attachment means, or a component of attachment means, for mechanically and securely attaching, or for mechanically and securely yet also removably attaching, that optical cell to the configuring element.1520. An arrangement according to claim 19, wherein any one of (i), (ii) or (ii) below is present:(i) each attachment means comprises a friction-fitting engagement between an outer wall of the respective optical cell and the defining wall(s) of a respective mounting aperture20 in the configuring element; or(ii) each attachment means comprises one or more, or one or more pairs of or a plurality of, snap-fit connection or docking elements provided on the respective optical cell which is / are inter-engageable in a snap-fit manner with one or more corresponding snap-fit connection or docking elements provided on the configuring element; or25 (iii) each attachment means comprises a mechanical docking-type inter-engagementin which each one of the respective optical cell and the configuring element is provided with a respective one of a pair of mutually inter-engageable detents, hooks, catches, clips or other docking inter-engagement elements, whose mechanical inter-engagement together effects the docking inter-engagement of the respective optical cell and the configuring element; or30 (iv) each attachment means comprises one or more, or a plurality of or one or morepairs of, snap-fit or click-in or other interconnection or docking or hooking or locking elements provided on the respective optical cell alone or the configuring element alone.

21. An arrangement according to claim 20, wherein:35 either (a) feature (ii) is present, and wherein the one or more corresponding snap-fitconnection or docking elements provided on the configuring element is / are provided adjacent a respective mounting aperture in the configuring element into which the respective optical23 04 25cell is to be mounted;or (b) feature (iii) is present, and wherein plural such pairs of mutually inter-engageable docking elements are provided, located on opposite sides of the respective optical cell and adjacent opposite sides of a respective mounting aperture in the configuring 5 element, for enhancing the security and stability of the docking mounting of the respective optical cell to the configuring element.

22. An arrangement according to any preceding claim, wherein there are provided either one of, or both of:10 (i) secondary mounting means for mounting or securing or attaching the configuringelement on or to a circuit board or wiring board, or a portion of either thereof, carrying the respective light sources for association with the respective optical cells; and / or(ii) tertiary mounting means for mounting or securing or attaching the configuring element to a luminaire body or frame.1523. An arrangement according to any preceding claim, as dependent through claim 2, wherein at least some of the plurality of apertures and the plurality of light sources are spatially arranged in or on the configuring element in a plurality of discrete groups, series, clusters or arrays, whereby one or more individual such groups, series, clusters or arrays 20 is / are located in a or a respective discrete section or region of the configuring element which is different from or spaced apart from the other section(s) or region(s) of the configuring element in which is / are located the other group(s), series, clusters) or array(s).

24. An arrangement according to any preceding claim, as dependent through claim 2, 25 wherein at least some of the plurality of apertures and the plurality of light sources are functionally arranged in or on the configuring element in a plurality of discrete groups, series, clusters or arrays, whereby one or more individual such groups, series, clusters or arrays is / are either (i) operable independently of one or more of the other groups, series, clusters or arrays, and / or (ii) designed and / or constructed to exhibit different lighting characteristics 30 and / or different optical functions from one or more of the other groups, series, clusters or arrays,wherein appropriate control over the individual groups’, series’, clusters’ or arrays’ operation is effectable by appropriate switching and / or electronic control means.35 25. A luminaire comprising:at least one arrangement according to any one of claims 1 to 24;a body or frame in which is contained the arrangement; and23 04 25a plurality of light sources, each said light source being mounted or positioned in or on or adjacent a respective optical cell received in a respective aperture of the configuring element, whereby each optical cell can receive, collect and redistribute light from a respective said light source;5 whereby the light sources are contained in the luminaire in the predefined spatialarrangement or relative configuration or pattern defined by at least some of the apertures in the configuring element;wherein the luminaire further comprises at least one circuit board or wiring board on which is / are mounted, or has / have been pre-mounted, the light sources.1026. An assembly for forming into a luminaire, the assembly comprising: at least one arrangement according to any one of claims 1 to 24; and a body or frame in which is contained the arrangement;wherein each respective optical cell received in a respective aperture of the 15 configuring element is for receiving, collecting and redistributing light from a respective one of the light sources in the predefined spatial arrangement or relative configuration or pattern defined by at least some of the apertures in the configuring element.

27. An assembly for forming into a luminaire, the assembly comprising:20 at least one arrangement according to any one of claims 1 to 24; anda plurality of light sources, each light source being mounted or positioned in or on or adjacent a respective optical cell received in a respective aperture of the configuring element, whereby each optical cell can receive, collect and redistribute light from a respective light source;25 wherein each light source is mounted or pre-mounted on at least one circuit board orwiring board, or at least one portion of a circuit board or wiring board, and the assembly further comprises the circuit board or wiring board, or the portion of either thereof.

28. A method of production of a luminaire, the method comprising:30 (i) forming an arrangement according to any one of claims 1 to 24 by:(i)(a) providing a plurality of optical cells each including means for receiving, collecting and redistributing light from a respective one of a plurality of light sources, wherein each optical cell comprises:(1) a light collector element,35 (2) a cover element attached to the light collector element, and(3) a transmission element mounted between the light collector element and the cover element;23 04 25wherein:(4) the light collector element comprises a body including:an input for receiving and collecting light from at least one light source, an output for propagating collected light towards the transmission5 element,at least one wall defining one or more portions of the body between its input and output and configured for collecting light entering the body via its input and conveying or directing said light towards its output, andattachment means for mechanically attaching the body of the light 10 collector element to the cover element and securing the transmission element between the light collector element and the cover element;(5) the cover element comprises:an input opening facing towards the transmission element and for receiving light transmitted by the transmission element,15 an output opening via which light is outputted from the optical cell, andat least one internal surface defining a cavity within the cover element between its input and output openings, the cavity’s internal surface(s) being configured for allowing or effecting passage of light, or a portion of the light, through the cavity from the cover element’s input opening towards its output opening; and20 (6) the transmission element comprises:one or more planar optical elements,wherein the or each optical element includes a first surface facing towards the output of the light collector element and a second surface facing towards the input opening of the cover element,25 and the or each optical element exhibits a predetermined opticalactivity or function in its transmission of light incident thereon which has exited the output of the light collector element and is transmitted by the transmission element towards the input opening of the cover element;(i)(b) providing a configuring element for accommodating the optical cells in30 a predefined spatial arrangement or relative configuration or pattern, wherein the configuring element comprises a sheet or plate or film of material having a plurality of apertures therein, at least some of which apertures are in the predefined spatial arrangement or relative configuration or pattern, each aperture being configured for receiving therein a respective one of the optical cells, and at least part of defining wall(s) of each aperture in the configuring35 element substantially geometrically matching or duplicating an external shape of at least part of the respective optical cell for being received therein, and wherein at least part of the defining wall(s) of each aperture, together with at least part of an external wall of a respective23 04 25optical cell to be received therein, collectively comprise respective orientation means for effecting reception of the respective optical cell in the respective aperture in any selected one of one or two or a plurality of specific discrete or fixed possible orientations relative to each other; and5 (i)(c) inserting each respective optical cell into a respective one of some orall of the apertures in the configuring element so as to form the arrangement;(ii) mounting or positioning a plurality of light sources in or on or adjacent respective optical cells received in respective apertures of the configuring element, whereby the resulting predefined spatial arrangement or relative configuration or pattern of the light 10 sources is substantially the same as or corresponds to the predefined spatial arrangement or relative configuration or pattern of the some or all of the apertures in the configuring element; and, either before or after this step (ii),(iii) mounting or positioning the arrangement in a body or frame of the luminaire.15 29. A method according to claim 28, wherein the step (ii) of mounting or positioning thelight sources in or on or adjacent respective optical cells received in respective apertures of the configuring element comprises either:- mounting or positioning in or on or adjacent respective optical cells of the arrangement at least one circuit board or wiring board, or at least one portion of a circuit 20 board or wiring board, on which have already been pre-mounted the light sources in the predefined spatial arrangement or relative configuration or pattern which is substantially the same as or corresponds to the predefined spatial arrangement or relative configuration or pattern of the some or all of the apertures in the configuring element; or- mounting or positioning respective optical cells of the arrangement on or 25 over or adjacent respective ones of the light sources, or on or over or adjacent respective ones of the light sources which have already been pre-mounted on the circuit board or wiring board or the portion of a circuit board or wiring board.

30. A kit of parts for use in forming a luminaire, the kit comprising:30 a plurality of optical cells each including means for receiving, collecting andredistributing light from a respective one of a plurality of light sources, wherein each optical cell comprises:(i) a light collector element,(ii) a cover element attached to the light collector element, and35 (iii) a transmission element mounted between the light collector element andthe cover element;wherein:23 04 25(iv) the light collector element comprises a body including:an input for receiving and collecting light from at least one light source, an output for propagating collected light towards the transmission element,5 at least one wall defining one or more portions of the body between itsinput and output and configured for collecting light entering the body via its input and conveying or directing said light towards its output, andattachment means for mechanically attaching the body of the light collector element to the cover element and securing the transmission element between the10 light collector element and the cover element;(v) the cover element comprises:an input opening facing towards the transmission element and for receiving light transmitted by the transmission element,an output opening via which light is outputted from the optical cell, and15 at least one internal surface defining a cavity within the cover elementbetween its input and output openings, the cavity’s internal surface(s) being configured for allowing or effecting passage of light, or a portion of the light, through the cavity from the cover element’s input opening towards its output opening; and(vi) the transmission element comprises:20 one or more planar optical elements,wherein the or each optical element includes a first surface facing towards the output of the light collector element and a second surface facing towards the input opening of the cover element,and the or each optical element exhibits a predetermined optical25 activity or function in its transmission of light incident thereon which has exited the output of the light collector element and is transmitted by the transmission element towards the input opening of the cover element; anda configuring element for accommodating the optical cells in a predefined spatial arrangement or relative configuration or pattern, wherein the configuring element comprises30 a sheet or plate or film of material having a plurality of apertures therein, at least some of which apertures are in the predefined spatial arrangement or relative configuration or pattern, each aperture being configured for receiving therein a respective one of the optical cells, and at least part of defining wall(s) of each aperture in the configuring element substantially geometrically matching or duplicating an external shape of at least part of the respective35 optical cell for being received therein, and wherein at least part of the defining wall(s) of each aperture, together with at least part of an external wall of a respective optical cell to be received therein, collectively comprise respective orientation means for effecting receptionof the respective optical cell in the respective aperture in any selected one of one or two or a plurality of specific discrete or fixed possible orientations relative to each other;together with one or more of the following (1) and / or (2):(1) a body or frame for containing the optical cells and any other components of the 5 luminaire;(2) the plurality of light sources for mounting or positioning in or on or adjacent the respective optical cells when received in respective ones of some or all of the apertures of the configuring element, whereby each optical cell can receive, collect and redistribute light from the respective said light source.1023 04 25

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