GB2547664A - Modular lighting system - Google Patents

Abstract

A lighting system comprises a plurality of lighting modules 901-904, each shaped so as to be capable of being connected together in a tiled arrangement, and a plurality of connecting members (1800, Fig. 18) for connecting together the lighting modules. Each connecting member extends between respective lighting modules and provides a mechanical and electrical connection between adjacent modules.

Description

MODULAR LIGHTING SYSTEM

Field of the Invention [0001] The present invention relates to lighting, and particularly although not exclusively to outdoor lighting.

[0002] Lighting installations consisting of arrays of light-emitting diodes (LEDs) are known and are used in a diverse range of applications encompassing lighting for warehouses, storage and distribution facilities, ports, docks and high level cranes, sports areas, aquatic centres, poultry farms, car parks, ice skating rinks, cold stores and food processing areas and leisure facilities.

[0003] Known light-emitting diode luminaires have economic and environmental advantages over equivalent luminaries containing incandescent lamps. The conversion ratio of electrical energy to light is higher for LEDs than for incandescent lamps. Further, the extended life of an LED light may be up to ten times that of their tungsten, sodium or halogen incandescent equivalents of the same light output.

[0004] Referring to figure 1 herein, there is illustrated schematically a known lighting module 100 comprising a plurality of individual direct current light-emitting diodes 101 arranged in an array. In the examples shown, two arrays of 12x2 diodes are installed side by side in a frame 102, pivotally attached to a mountain bracket 103, giving a light source of 48 individual light emitting diodes in a single luminaire module.

[0005] Referring to figure 2 herein, there is illustrated schematically a second lighting module 200 comprising a planar mounting board 201; a mounting bracket 202, and six separate LED lighting modules 203 - 208 attached to the mounting board. Each LED lighting module comprises a 6 x 2 array of direct current light-emitting diodes 209 mounted within a sub frame 210, one sub frame per array. The sub frames are mounted to the base plate to provide a luminaire having 72 individual light-emitting diodes, all directed in the same direction, having the center of their main beam angles pointing in a direction perpendicular to the main plane of the base plate.

[0006] Referring to figure 3 herein, there is illustrated schematically a third type of known LED luminaire 300 consisting of four separate sub frames each containing a 12 x 2 array of light-emitting diodes. The four sub frames are mounted within a pair of end plates 301,302, connected by a base plate 303. Mounted on the base plate are electrical connections 304, 305 for the four separate lighting modules comprising the luminaire. In this example, the two outermost lighting array modules have their main central beam directions divergent from each other, and divergent from the beam direction of the two central interior light modules, to provide effectively three separate light beams, each outer beam consisting of the individual light beams from the 24 LEDs of each outer module and the central light beam consisting of the 48 individual LED beams of the two central light modules.

[0007] Referring to figure 4 herein, there is illustrated schematically the third known LED luminaire 300 in view from underneath.

[0008] Referring to figure 5 herein, there is illustrated the third known LED 300 in view from one side.

[0009] Referring to figure 6 herein, there is illustrated schematically the third known LED 300 in view from the front.

[0010] The assembly of four lighting modules within the end plates 301, 302 can be tilted with respect to a mounting bracket 306 to which the end plates are attached, so that direction of the light beams of the array of luminaires can be swiveled as a whole relative to the mounting bracket 306.

[0011] Known LED luminaries use d.c light-emitting diodes, which are driven by separate drive unit which steps down nominal 50Hz a.c mains at 240V to a small d.c voltage. A reliability weak spot of known LED luminaries are the step down drive units which convert mains a.c supply to a localized d.c supply for driving the light-emitting diodes.

[0012] Due to the wide range of applications for commercial LED luminaries, manufacturers and suppliers carry a wide range of different designs of luminaire, each having different arrays of light-emitting diodes, some examples of which are shown in figures 1 to 4 herein.

[0013] It is an ongoing objective to improve the reliability of LED type luminaries for indoor or outdoor industrial use.

[0014] It is a further objective to rationalize the relatively large number of different LED array modules needed to produce a range of different luminaire types.

[0015] For example in a typical industrial application at a port, one or more luminaires may be mounted at a height of 38m or more above ground. At this height, the weight of a luminaire is a significant consideration, since large luminaires can weigh up to 50kg, which requires the luminaire to be mounted to a robust and strong support. Reducing the weight of a luminaire for the same light output performance can lead to savings in weight of the supporting structures, such as lighting posts, needed to mount those luminaries. Further, reducing the weight of luminaries assists in the ease of maintenance, particularly where the luminaries need to be manually lifted from a moveable platform suitable for maintenance workers, and fitted to a supporting structure.

Summary of the Invention [0016] According to a first aspect of the present invention, there is provided a lighting module comprising: a base plate; a circuit board comprising a plurality of light emitting diodes arranged in an array; and a lens wherein said baseplate comprises a connection region for connecting said base plate to an adjacent lighting module.

[0017] According to a second aspect of the invention there is provided a connector member for connecting together a plurality of lighting modules, said connector comprising: a main body comprising a first end, a second end and a central portion between said first and second ends; wherein said first and second ends are each wider than said central portion.

[0018] According to a third aspect of the invention there is provided a lighting system comprising: a plurality of lighting modules each shaped so as to be capable of being connected together in a tiled arrangement; and a plurality of connector members for connecting together said plurality of lighting modules; wherein said plurality of lighting modules are connectable to each other using one or more of said plurality of connector members, each said connecting member extending between a respective first and second lighting module to connect said lighting modules together.

[0019] Other aspects are as set out in the claims herein.

Brief Description of the Drawings [0020] For a better understanding of the invention and to show how the same may be carried into effect, there will now be described by way of example only, specific embodiments, methods and processes according to the present invention with reference to the accompanying drawings in which:

Figure 1 herein illustrates schematically in perspective view from the front and one side, a first known luminaire comprising an array of DC light emitting diodes arranged in two modules in a single frame;

Figure 2 herein illustrates schematically in perspective view from underneath and one side, a second known luminaire comprising six individual LED modules arranged on a single back plate;

Figure 3 herein illustrates schematically in perspective view from above and the rear, a third known luminaire comprising four individual LED modules arranged in a single frame;

Figure 4 herein illustrates schematically in view from underneath, the third luminaire shown in figure 3 herein;

Figure 5 herein shows the third luminaire of figure 3 in view from one side;

Figure 6 herein shows the third luminaire of figure 3 herein in view from the front;

Figure 7 herein shows schematically in perspective view a first embodiment lighting module according to a first aspect of the present invention;

Figure 8 herein shows the first embodiment lighting module in exploded view illustrating a base plate, circuit board and lens component;

Figure 9 herein illustrates schematically a luminaire comprising four individual lighting modules connected together in a tiled or mosaic manner;

Figure 10 herein illustrates schematically in plan view connection of base plates of an arrangement of four individual lighting modules is as described herein to form a luminaire;

Figure 11 herein illustrates schematically an electrical connection circuit between a plurality of electrical connection points on an individual lighting module

Figure 12 herein illustrates schematically in cutaway view from one side focusing of light beams of a plurality of individual light emitting diodes in an array of diodes mounted on a circuit board, by a covering lens component of the lighting module to produce a parallel beam;

Figure 13 herein illustrates schematically in cutaway view from one side a second embodiment lighting module having a lens which produces a diverging resultant light beam by focusing a plurality of individual light beams issued by a plurality of individual light-emitting diodes;

Figure 14 herein illustrates schematically in plan view a baseplate component of the first embodiment lighting module described herein, and including a first type of connector component for connecting first and second base plates;

Figure 15 illustrates schematically the lighting module baseplate of figure 14 in isometric view;

Figure 16 herein illustrates schematically in perspective plan view, the baseplate of the lighting module, having a circuit board and electrical connectors in a central region;

Figure 17 herein illustrates schematically the lighting module of figures 14 to 16 in perspective view from the rear, and illustrating first and second connector types;

Figure 18 herein illustrates schematically a first connector type for connecting adjacent base plates of adjacent lighting modules both mechanically and electrically;

Figure 19 herein illustrates schematically a second type of connector having fitted thereto a spacer component;

Figure 20 herein illustrates schematically in dissembled view the second type of connector as shown in figure 19 herein;

Figure 21 herein illustrates schematically a pair of eye bolt components for use with the lighting module of figure 18 herein;

Figure 22 herein illustrates schematically a spacer component for use with the lighting module;

Figure 23 herein illustrates schematically in perspective view one side of the lighting module having a first type connector fitted thereto;

Figure 24 herein illustrates schematically one side of a lighting module showing the underside of a first type connector, together with a connecting region to which the connecting member engages on a base plate;

Figure 25 herein illustrates schematically the underside of a baseplate of a lighting module, showing four individual connecting regions, each having an electrical connector;

Figure 26 herein illustrates schematically in view from the rear and one side a single lighting module suspended by a set of wires or chains;

Figure 27 herein illustrates schematically in view from the rear and one side how a single lighting module can be mounted to a wall or ceiling using a pair of "0" shaped pole clamps fixed to a spacer;

Figure 28 herein illustrates schematically in view from the rear and from one side how a single lighting module can be fixed to a wall or ceiling using a "U" shaped bracket connected to a pair of eye bolts;

Figure 29 herein illustrates schematically in view from the rear a luminaire comprising nine individual lighting modules suspended by four wires;

Figure 30 herein illustrates schematically in view from the rear a luminaire comprising nine individual lighting modules suspended by two "U" shaped brackets;

Referring to figure 31 herein, there is illustrated schematically seating of a lens cover upon a sealing ring at a perimeter of a baseplate of a lighting module as described herein; and

Referring to figure 32 herein, there is illustrated schematically seating of a an alternative embodiment lens cover upon a sealing ring at the perimeter of the baseplate of a lighting module as described herein.

Detailed Description of the Embodiments [0021] There will now be described by way of example a specific mode contemplated by the inventors. In the following description numerous specific details are set forth in order to provide a thorough understanding. It will be apparent however, to one skilled in the art, that the present invention may be practiced without limitation to these specific details. In other instances, well known methods and structures have not been described in detail so as not to unnecessarily obscure the description.

[0022] Referring to figure 7 herein, there is illustrated schematically a novel lighting module 700 according to a specific embodiment of the present invention. The lighting module comprises a base plate 701 covered by a transparent or translucent lens 702.

[0023] Mounted on the base plate 701 are a plurality of alternating current LEDs arranged in rows and columns in an array. The lens 702 comprises a single component formed preferably of glass or plastics material, having a substantially flat outwardly facing planar surface, and underneath the surface, there are provided a plurality of individual lens-like surface undulations, each of which individually focuses the light output from a corresponding respective AC light emitting diode.

[0024] Preferably the upper surface of the lens 702 is either flush external walls 703 of the base plate 701, or in an alternative embodiment, the lens may protrude slightly above the outer walls of the base plate 701. The lens may sit within a recess of the base plate 701 with a rubber or plastics sealing ring there between, to prevent the ingress of moisture, and to provide physical isolation of the components mounted inside the baseplate.

[0025] The base plate 701 is arranged such that it can be placed side-by-side with another similar or identical baseplate of an adjacent module, such that the two adjacent base plates can be connected together both physically and electrically by a single connector component.

[0026] A plurality of modules can be arranged side-by-side to form a luminaire of overall greater size. In the general case, an array of modules n x m may be assembled to form a luminaire assembly, where n and m are integers, for example: 1 x2 modules 2x3 modules 2x4 modules 2x5 modules 2x6 modules 3 x 1 modules 3x3 modules 3x4 modules 4x1 modules 4x2 modules 4x4 modules [0027] Referring to figure 8 herein, there is illustrated schematically in exploded view the lighting module of figure 7. Located between the base 701 and the lens 702 is a circuit board 800. Mounted on the circuit board are an array of alternating current light-emitting diodes 801. The circuit board comprises a rigid board having a plurality of printed conductors which deliver electrical power to each of the individual light-emitting diodes 801.

[0028] In use, the printed circuit board is fixed to the aluminium base plate 701, such that the rear of the circuit board contacts a substantially flat central region 802 of the base plate 701 so that heat generated by the light-emitting diodes is conducted through the rigid board 800 to the rear of the board, and conducts to the mounting surface 802 of the base plate, so that the base plate 701 provides a sink for heat generated by operation of the light-emitting diodes.

[0029] The lens cover plate 702 fits over the circuit board and the array of light-emitting diodes, so that the circuit board is enclosed between the base plate 701 and the covering lens 702.

[0030] The lens cover 702 is formed of a single block of plastics or glass material, and comprises an upper outer face 803 which is substantially flat and smooth, and has an underside which comprises a plurality of convex mound formations arranged in an array, whereby each convex mound acts as an individual lens to focus the light emitted by a corresponding respective a.c. LED 801 to transmit the light emitted by that LED through the bulk material of the lens cover 702 and to provide a plurality of individual light beams, one per light-emitting diode, shining out of the upper surface 803 of the lens cover 702. The resultant overall beam from the lighting module is made up of a plurality of individual beams, each generated by a corresponding respective light-emitting diode. The individual mound like convex lenses on the underside of the lens cover 702 are located such that when the light module is assembled the convex lenses are in close proximity to the light-emitting diodes, but do not quite touch the light-emitting diodes.

[0031] The lens cover 702 comprises four substantially flat planar sides arranged perpendicularly to the main outward facing surface 803, so that the lens is substantially block or tile shaped. The peripheral sides of the lens 803 align with the peripheral flat sides of the base plate 701, so that the whole lighting module when assembled is in the form of a square block having four substantially flat sides.

[0032] In a best mode, the upper surface 703 of the lens cover, when fitted to the base plate 701 is either flush with, or slightly recessed or countersunk compared to the outer perimeter wall 804 of the aluminium base plate 701. However, in another embodiment having better explosion protection, the lens 702 may protrude slightly above the outer rim 804 of the perimeter of the base plate 701. Between the lens cover 702 and the recess 802 in the base plate 701 is provided a plastics or rubber sealing ring 805. The sealing ring 805 isolates the circuit board 800 mechanically from the outside of the lighting module, so that if there is a malfunction of any of the electronic components which may lead to a spark, this mark cannot propagate outside the enclosure between the base plate 701 and the lens cover 702. The degree of spark isolation is determined by the integrity of the seal 805 between the lens cover 702 and the base plate 701, which in turn is determined by the rigidity of the lens cover 702. By increasing the thickness of the lens cover 702, thereby making it more rigid and less prone to bending, a better seal can be achieved. Preferably the thickness of the lens cover 702 is in the range 3 to 5 mm, for a lower level of exposure explosion protection. For a higher level of explosion protection up to explosion proof class 02, preferably the thickness of the lens cover 702 is in the range 5 mm to 8 mm. At this greater thickness, the upper surface of the lens 702 may protrude beyond the plane described by the surface of the outer wall perimeter 804 of the baseplate.

[0033] The lens cover may be secured to the base plate by a plurality of screws 806 which are located outwardly of the sealing rig 805 and which locate in corresponding threaded holes in the base plate 701 so that the cavity in which the circuit board resides is covered by an unbroken sheet of material without any holes or apertures, and sealed around the perimeter by the sealing member 805 ensuring an airtight cavity. In a modification, the cavity may be filled at the point of manufacture with an inert gas in order to reduce the risk of propagation of any sparks or fire caused by malfunctioning electrical or electronic components within the cavity.

[0034] Referring to figure 9 herein, there is illustrated schematically in perspective view a luminaire 900 comprising four individual lighting modules 901-904, each as disclosed in figures 7 to 8 herein, connected together side by side in a tiled configuration.

[0035] Each individual lighting module 901-904 is connectable to and dis-connectable from its nearest neighbour mechanically using a connector component which extends between the respective base plates of the two adjacent lighting modules. The substantially flat sides of the lighting modules abut each other as the modules are placed side-by-side. The lighting modules are connected to each other by a connector member which extends between the base plates of two adjacent lighting modules, rigidly locking the two adjacent modules together.

[0036] Therefore, for example in a 2 x 2 array of lighting modules as shown in figure 9 herein, there will be four connector members connecting the four lighting modules, one between each adjacent pair of lighting modules. The connector components extend between the bases of the adjacent lighting modules, connecting the base portions together mechanically to make a rigid assembly.

[0037] Adjacent lighting modules are connected electrically to each other by a single connector member. Connection of a first lighting module to a second module causes electrical connection between the two modules, with the live conductor of a first module connecting to a live conductor of the second module, and the neutral conductor of the first module connecting electrically to a neutral conductor of the second module, so that when connected together from the first and second modules share a common power supply.

[0038] Referring to figure 10 herein, there is illustrated schematically in plan view, connection together of four individual base plates 1001-1004 of four individual lighting modules, as disclosed in figure 9 herein to create a luminaire of larger size than each individual lighting module.

[0039] The substantially square baseplate 1001-1004 of each lighting module is provided on each side of the square with a recessed female connection point 1005, configured to engage with a male connecting member 1006. Opposing sides of two adjacent lighting modules can be connected together by inserting the connecting member in the corresponding respective female recesses 1005 of each lighting module so as to lock the two lighting modules together. In this manner, a plurality of lighting modules can be connected together in a tiled manner to create a luminaire. In the embodiment shown, the connecting members 1006 are substantially butterfly or bowtie shaped in plan view, and span between adjacent base plates of adjacent lighting modules to mechanically connect adjacent lighting modules together.

[0040] In a luminaire comprising a plurality of lighting modules, there need be made only one external electrical connection to an external power supply, connected at the connecting region of one of the modules. Due to the expandability of the modular system, whereby each module connects electrically and mechanically with an adjacent module, this alleviates the need for making a separate connection between an external power supply and each individual module. Connection of an external power supply to a single module will provide power to all modules within a plurality of modules making up a luminaire.

[0041] In figure 10 herein, each of the four base members are shown without their heat sinks, connected together by four butterfly shaped connectors. Each butterfly shaped connector extends between adjacent baseplate members, each connecting a baseplate to an adjacent baseplate. The connector members are each secured to the base plates by a respective cap head screw passing through the connector and into a threaded pillar within the connecting region of the baseplate.

[0042] Referring to figure 11 herein there is illustrated schematically in plan view part of an electrical wiring diagram of a lighting module as described herein. At each connection point 1101 - 1104 there are a pair of electrical terminals, one live and one neutral. All the live terminals are connected together by a first, live conductor 1105, and all the neutral terminals are connected together by a second, neutral conductor 1106, so that connection of an electrical connecting member at any one of the connection positions causes both of the conductors to become electrically connected to a respective live and neutral power supply. The base plate is also provided with an earth connection, electrically isolated from the live and neutral connectors, and connection of two baseplates together of two adjacent light modules creates and electrical earth connection between them.

[0043] The arrangement shown in figure 11 is schematic. In practice, a wide variety of topologies of conductor tracks may be printed on the circuit board 800 so as to connect each light-emitting diode in the array with a live conductor and a neutral conductor. However the general principle is that at each peripheral connection point 1101-1104, there is provided a live terminal and a neutral terminal so that live and neutral electrical connections can be made at any connection point on any one of the four sides of the lighting module. Connection of an AC supply to one of the connection terminals supplies power to the whole array.

[0044] Further, connection of an AC power supply to one of the connection terminals also provides a path of conduction to the other connection terminals of the lighting module, thereby allowing a plurality of modules to be chained electrically and operated as one light as the lighting modules are assembled together in a tiled pattern.

[0045] Referring to figure 12 herein, there is illustrated schematically a lighting module as described with reference to figures 7 to 11 herein, in cross-sectional view from one side along a line bisecting a plurality of light-emitting diodes arranged in a row. The light-emitting diodes 801 are spaced apart slightly from the underside of the lens block 702. The underside of the lens block 702 comprises a plurality of individual convex circular domes 1200 arranged in rows and columns so that they lie opposite the plurality of light emitting diodes, which are also arranged in rows and columns. Each convex dome 1200 provides an individual lens to focus the light emitting from a corresponding respective light-emitting diode. In the example shown in figure 12, light-emitting from an LED 801 diverges, typically with a diverging beam angle in the range 30° to 40°. The individual convex protrusions 1200 focus the diverging light beam into a substantially parallel beam which passes through the bulk material of the lens block 702 to exit the block as a substantially parallel beam of light. In this example, the resulting overall light beam emitted from the lighting module comprises a plurality of individual beams from the plurality of individual light-emitting diodes, each exhibiting the lens block 702 in a direction perpendicular to the front outwardly face 703 of the lens block.

[0046] Referring to figure 13 herein, there is illustrated schematically in cutaway view from one side a further embodiment lighting module having a lens block 1300 having a plurality of convex protrusions 1301 for focusing the individual light beams of corresponding respective light-emitting diodes 801, but where the convex protrusions have a different radius of curvature, with the result that they focus the diverging light beams issued by the light-emitting diodes into a plurality of individual diverging to beams, one per light-emitting diode. In this embodiment, the overall beam emitted by the lighting module may be diverging. In the best mode, a beam angle of around 30° may be provided, this being the beam angle of the overall light output of the lighting module, which comprises a plurality of individual light beams each produced by each individual light emitting diode, and each individual light beam having a beam angle at the point of exit from the front face of the lens block 1300 of around 30°.

[0047] It will be appreciated by the person skilled in the art that by modifying the radius of curvature of the convex protrusions on the underside of the lens block, the amount of focusing of the diverging beam angles of the light-emitting diodes can be varied, so that the beam angle of the individual light beams emitted from the front surface of the lens block is design variable parameter. In the best mode, typically beam angles in the range 0° to 45° are preferred, where the beam angle is the angle at which the power intensity of the light beam is reduced to 50% of the power intensity of the beam measured in a direction perpendicular to the main plane of the lens face.

[0048] Referring to figure 14 herein, there is illustrated schematically in view from the front a base plate 701 of a lighting module as described in figure 7 herein. The baseplate comprises a cast aluminium body 1400 of overall square shape, having a front, a rear, and first to fourth sides 1401-1404. At the front of the baseplate there is a flat recessed central region 1405 suitable for mounting of a circuit board thereon. The substantially flat central region surface is suitable for closely contacting with a rear surface of the circuit board, in contact with the rear surface, and optionally with heat conducting paste being provided there between for transferring heat from the circuit board to the baseplate, the heat being generated by an array of a.c. light emitting diodes mounted on the circuit board.

[0049] Located around the perimeter of the central flat region 1405 is provided a sunken perimeter region 1406. The sunken perimeter region houses a seal ring onto which the lens cover plate presses. Around the outside of the sunken perimeter channel region there are provided a plurality of threaded holes 1413 which into which a plurality of screws secure in order to secure the lens cover plate on top of the sealing ring and on top of the baseplate.

[0050] Referring to figure 15 herein, there is illustrated schematically in isometric view, the base plate of figure 14, showing the upright sides 1401, 1403, 1404 and showing the square shaped recessed region 1405 into which the circuit board containing the array of light-emitting diodes is inserted. Also shown is a connector member 1410 connected into one female connection region of the base plate, and protruding beyond the outer sidewall 1404 of the base plate.

[0051] Referring to figure 16 herein, there is illustrated schematically in view from above, the base plate 701, having a circuit board 800 attached. The circuit board comprises a plurality of individual AC light-emitting diodes 801 arranged in a 4 x 8 array of rows and columns. Associated drive electronics 1602-1605 are arranged on an outer region of the circuit board away from the main central region containing the AC light-emitting diodes. Connection of power to the circuit board can be made at any one of four individual contact locations 1606-1609 by connection of a pair of electrical connections 1610 which connect power through a connector as described herein.

[0052] Also shown more clearly in figure 16 is a perimeter channel 1610 into which a sealing ring fits to provide a gas tight seal between the upper profile of the baseplate and the glass or plastics cover lens. In this embodiment, the sealing ring may fit in a channel between an inner wall 1611 and an outer wall 1612. Around a periphery of the inner wall, and in the outer wall there are provided a plurality of tapped bores 1613 for receiving screws, so that the screws pass through the flat plate like a lens at a location radially outwardly of the sealing ring to secure the lens to the outer wall portion of the baseplate, creating a sealed cavity therebetween in which the circuit board 800 is located.

[0053] Referring to figure 17 herein, there is illustrated schematically in perspective view from underneath the base plate of figures 14 to 16 herein.

[0054] The underside of the base plate comprises a heat sink region 1700 comprising a plurality of parallel rib shaped cast metal veins arranged side-by-side, such that air may infiltrate between the adjacent veins, thereby increasing the surface area of metal which is exposed to air, and therefore increasing the rate of heat transfer from the base plate to the surrounding air.

[0055] Also shown is a female connector member 1701 which is pressed into a male connecting region of the base plate.

[0056] The base plate comprises a plurality of male connecting regions, 1702 - 1705 each connecting region being in plan view in the shape of a truncated pyramid, having its relatively wider base located inwardly from the outer periphery of the base plate, and its narrower region located at the perimeter of the baseplate. Each male connecting region is bounded by an upright cast wall, 1706 extending perpendicular to the main plane of the base plate. Within the region bounded by the upright wall is provided an upright circular cylindrical or tubular stud 1707 having a substantially frusto shaped outer surface, placed adjacent an oval shaped through-slot 1708.

[0057] In use, an electrical plug or socket connector fitted to the underside of the circuit board may protrude through the oval slot 1708 so as to present a pair of electrical conductors within the region bounded by the upright cast wall 1706, so that when a connector member 1701 is pressed into the male connecting region, mechanical connection is achieved by the connection of a corresponding circular tubular aperture in the connector member engaging with the protruding circular cylindrical tubular stud 1707, and by the outer walls of the connecting member 1701 engaging with the inner surface of the upright cast wall 1706 of the connecting region; and electrical connection may be made by engagement of an electrical connector within the connecting member 1701 contacting the electrical conductors of the male or female plug which passes through the oval slot in the base plate.

[0058] The connector member 1701 is designed such that it can be pressed into place in the connecting region manually without the need for any tools, and engages in the connection region in a press fit or ’’click fit” manner whereby when the connector is pressed into the connection region, there is a positive engagement as the connector locates itself correctly in the connector region, so that a person assembling the connector to the baseplate can easily determine that secure engagement connection has been made between the baseplate and the connector.

Connector members [0059] Referring to figure 18 herein, there is illustrated schematically in perspective view an example of a first connector member 1800 being of the type which connects two base plates together both mechanically and electrically. Each connector member comprises in plan view a substantially bow tie or butterfly shaped body member 1801 having a first end 1802; a second end 1803; a central portion 1804 between said first and second ends; a base or floor portion 1805; and upright peripheral wall 1806; a first upright hollow circular stud member 1807 adjacent the first end; a second hollow substantially circular stud member 1808 adjacent the second end.

[0060] The first and second ends of the body are wider than the central portion. The connector is symmetrical, so that bisected along a plane coinciding with the main central axes of the two studs 1807, 1808, a first side of the connector member is a mirror opposite to the second side. Similarly, the connector member is symmetrical about a plane placed midway between the two central axes of the studs 1807, 1808, so that the first end is a mirror image of the second end.

[0061] A correspondingly shaped upper plate 1809 is provided in order to seal the connector member. Around an upper periphery of the outer wall there is provided a rubber or plastics sealing ring which provides a watertight seal between the cover plate member and the upper wall. The cover or lid 1809 fits over the top of the connector body 1801 and is held in place by screws or bolts which extend through the cover plate, through the body and are screwed into the baseplate of the lighting module.

[0062] At each of the wider ends of the connector is an aperture suitable for passing a plug/socket connector through, such that the plug/socket connector can connect with a corresponding opposite plug/socket connector mounted in the connection region of the baseplate, thereby making electrical connection between two adjacent base plates. If the connector member is to be used as a mechanical only connection without connecting to base plates together electrically, then the plugs/sockets may be omitted.

[0063] As shown in figures 14 to 18 herein, an upper part of the connector member 1800 contains both a frusto-conical shaped internal chamber 1411 for cooperating with a stud member on the base plate, and an electrical plug or socket member which , in use, aligns with the aperture member of the base plate, so that an electrical plug or socket contained in the connecting member engages with a corresponding plug or socket member fitted to the underside of the circuit board of the lighting module, and which protrudes through an aperture in the base plate. Connection of the connecting member at the connecting region makes both mechanical connection and electrical connection to the base plate. The electrical plug and socket connectors comprise a live connector and a neutral connector. Electrical earthing of one baseplate to another is provided through the main metal body of the connector member itself.

[0064] Figures 19 and 20 herein show a second type of connector member 1900 which is used as an electrical connection point between a baseplate and an external power supply. In a luminaire comprising a plurality of lighting modules, only a single external electrical connection point is required, because the modules share their power supply by virtue of the first type mechanical and electrical connector member 1800 as herein described, which automatically connect the modules electrically when they are physically connected together using the connector members.

[0065] The single engagement connector comprises a connector body 1901, having a relatively wider first end 1902, and a relatively narrower second end 1903; first and second sides 1904, 1905; and a base portion. The sides and base portion are in the general shape of a truncated pyramid when viewed from above. Within the outer peripheral wall of the body of the connector member, there is an internal substantially cylindrical circular recess 1906 substantially centrally, having a circular cylindrical internal wall, and a substantially oval shaped recess 1908 into which a plug connector can be fitted. At the relatively narrower end 1903, there is a cable connector 1909 for connecting an external electrical cable to the single connector and supplying electrical power thereto for connection to a plug member which fits in the recess 1908.

[0066] A correspondingly shaped lid or cap 1910 is provided, which fits over top of the connector member, there being a rubber or plastics sealing ring which extends around upper rim of the external walls of the connector member sealing the lid 1910 to the body in use. As shown in fig in 19 herein, an upstanding stud member 1911 may be provided, the stud member having an externally substantially hexagonal pillar shape and having an internal central threaded bore 1912. The male/female spacer 1911 provides a threaded bore into which a bolts or screw can be fitted. Preferably the component is and M8 thread and of stainless steel.

Mounting of Lighting Modules and Luminaires [0067] Referring to figure 21 herein, there is illustrated schematically a pair of eye bolt mounting components suitable for insertion into the spacer mountings of the mounting component. The eye bolts are of conventional manufacture comprising an elongate cylindrical threaded portion having an annular head portion.

[0068] Referring to figure 22 herein, there is illustrated schematically in cutaway view a stud or spacer component 1911 for use as a mounting component with the lighting modules disclosed herein. The spacer component comprises a substantially hexagonal outer body having a central threaded bore and, projecting from a lower end of the hexagonal body, a substantially cylindrical threaded bore. The spacer component may be formed from a single block of material.

[0069] The spacer can be used instead of a screw or bolt in order to connect one of the connectors to a connecting region of the base plate of the lighting module. A range of attachments, for example an eye bolt or a conventional screw or bolt can be screwed into the stud /spacer components to give a variety of mounting options at the rear of the lighting module from mounting the lighting module to various brackets or other mounting means.

[0070] Referring to figure 23 herein, there is shown in perspective view one side of a lighting module, from the rear underside of the baseplate, showing a first type connector connected to the connecting region at the side of the baseplate. The first type connecting member 2300 is shown located within the walls of the connecting region and retained to the baseplate by a bolt or screw 2301.

[0071] The connector is prevented from rotating within the connection region due to the truncated triangular shape of the connecting region, and the corresponding truncated triangular shape of the outer walls of the connector. The connector component comprises a substantially truncated triangular plug body shaped to fit inside the upright perimeter walls of a connecting region of a baseplate, as hereinbefore described. The plug body has first to fourth flat substantially planar sides and an upper covering portion, which overhangs the upright sides. The plug member is generally solid, and cast from a single block of preferably a metal or plastics material. Within the body there are formed an elongate slot channel, and a substantially circular cylindrical cavity 1908, which has a slightly inclining internal frusto-conical shaped surface which engages with a protruding stud or pillar projection rom the baseplate at a said connection region as hereinbefore described.

[0072] The connector is designed so that it can be pressed home into a connection region on the rear of a baseplate without the use of tools. The design tolerances of the connector body are such that it may fit into the connection region of the base plate by an interference fit with enough friction that it will be retained under normal usage when the module, or a luminaire comprising the module is suspended from the mounting component, but also such that the mounting component can either be pulled out of the connection region using only manual force, or can be levered out of the connection region using basic tools such as a flat bladed screwdriver.

[0073] Referring to figure 24 herein, there is illustrated schematically part of a lighting module including a connecting region 2401, and an associated second type electrical connector 2402. The connector is shown inverted so that the plug connector 2403 which resides in the relatively wider part of the connector can be seen. The plug connector comprises a pair of spring biased connector pins which in use are urged against a pair of metal conducting surfaces which are presented within the connecting region of the base plate of the lighting module. The spring biased connecting pin is urge against the metal connecting surfaces once the connector member is located in the connecting region, and secured thereto by a bolt or screw as shown in figure 23 herein.

[0074] There may be provided a rubber or plastics insert to be located within the connection region as shown in figure 24 which acts as a moisture and air tight seal when the connector 2402 is engaged in the connection region 2401 to perform the function of isolating the electrical connection 2403 from the outside atmosphere around the lighting module, so that all electrical connections are electrically isolated in a gas tight and/or moisture tight manner, enabling the lighting module to become fully waterproof and gas proof with all electrical connections being carried out within the sealed environment of the lighting module itself, or within the sealed environment of the connector and connecting region.

[0075] Referring to figure 25 herein, there is illustrated schematically in perspective view from one side and above, a baseplate of a lighting module, showing a heat sink 2501 attached to the rear of the base plate. The heat sink is connected to an opposite side of the baseplate to which the circuit board containing the array of light-emitting diodes is connected, so that he can transfer from the circuit board through the metal of the baseplate and to the heat sink. Also shown in figure 25 of the electrical socket type connectors 2501 installed in one of the connecting regions. The socket type connectors provide electrical power to the circuit board. One socket type connector is presented at each of the connecting regions, so that the lighting module can be connected electrically to an adjacent lighting module from any of its sides.

[0076] Referring to figure 26 herein, there is illustrated schematically suspension of a single luminaire to 2600 from a pair of suspension points and first and second cables or wires 2603. Connectors 2601, 2602 as described herein with reference to figures 18 to 20 are fitted to corresponding respective female mounting regions at the rear of the base plate of a lighting module, or, where to or more lighting modules are assembled to form a larger luminaire, to separate mounting regions on the same or different lighting modules in the same luminaire. Each mounting component is fitted with an eye bolt, which is rotated into the central threaded bore of the spacer component of the mounting component and secured their by a locking nut. Individual cables or wires to 2603 are fitted through the eyes of the eye bolts 2100 order to suspend the lighting module.

[0077] Referring to figure 27 herein, there is illustrated schematically a lighting module 2700 adapted for mounting on a circular pole or beam using a pair of pole clamps 2701 , 2702 each fixed to a corresponding spacer component at the rear of the lighting module. A stud or spacer type mounting component 1911 as described herein before is fitted to each of two connectors and connecting regions on opposite sides of the lighting module/ luminaire. Each mounting member has an upright spacer 1911. To the top of each spacer is fitted a first half to 2703 of a substantially "O" ring shaped pole mount bracket 2701. The lower half of the pole mount bracket is secured to the top of the spacer by inserting a bolt through a base of the bracket half. The lighting module may be fitted to a circular cylindrical pole or rod by placing the two lower halves of the two against the supporting pole, and fitting the second halves of the pole mounts to the lower halves using a pair of bolts as shown.

[0078] Referring to figure 28 herein, there is illustrated schematically in view from the rear and one side an individual lighting module 2800 as described herein before having a wall or ceiling mount 2801 with a "U" shaped bracket bolted to eye bolts to suspend or mount the lighting module. A pair of plug -type connectors 1900 and/or 1800 as described herein before with reference to figures 18 and 19 are fitted to opposing connection regions at opposite sides of the luminaire. An eye bolt is inserted into the central bore of each upright spacer mount 1911. A substantially "U" shaped bracket 2802 long enough to span across the rear of the luminaire between the two connection regions is fitted to the eye bolts by passing a further pair of bolts through the eyes of the eye bolts, and securing them thereto with an aero nut or a locknut. By adjusting the tension on the locknut/aero nut the lighting module may be adjustably angled with respect to the mounting bracket, so that the lighting module can be tilted with respect to a mounting surface to which the U-shaped bracket 2802 is affixed.

[0079] To connect the lighting module to a surface or support to which it is to be mounted, firstly the U-shaped bracket 2802 is fixed to the mounting surface using a set of bolts passed through the three apertures 2803 in the mounting bracket. With the mounting bracket securely fixed to the support surface, a pair of lateral bolts 2804 may be passed through apertures in the sides of the U-shaped bracket and through the eyes of the eye bolts protruding from the spacer components. The lateral bolts 2804 are tightened up in order to securely and rigidly mount the lighting module to the U-shaped bracket.

[0080] Referring to figure 29 herein, there is illustrated schematically in view from the rear, a luminaire 2900 comprising nine individual lighting modules arranged in a 3 x 3 tiled pattern and connected together using connecting members as hereinbefore described, supported by four separate suspension wires or cables 2901-2904 connected at perimeter positions of the luminaire.

Such a suspension method may be used where the luminaire is held within a surrounding framework, or where the luminaire is suspended from a ceiling, with its beam directed downwardly. Each cable or wire 2901- 2904 has its end connected to a corresponding respective eye bolt. Each eye bolt is inserted into the bore of a male/female spacer member as described herein before with reference to figures 20 and 21 herein.

[0081] Referring to figure 30 herein, there is illustrated schematically from the rear, a luminaire 3000 comprising an array of 3 x 3 individual lighting module is connected together and suspended by first and second mounting brackets 3001, 3002. Each mounting bracket is connected to an individual lighting module as hereinbefore described with reference to figure 30 herein. The complete luminaire is suspended from the two mounting brackets by bolting or otherwise fixing the mounting brackets to an external support, for example beam or a wall. The two mounting brackets may be affixed to the beam or wall, separately, and then the luminaire may be connected to the brackets by bolting the sides of the substantially "U" shaped brackets to the eye bolts protruding from the mounting components fixed to the rear of the lighting modules.

[0082] Referring to figure 31 herein, there is illustrated schematically in cutaway view an alternative method of seating of an upper lens cover within a channel of the baseplate of a lighting module as hereinbefore described. Lens cover 3100 seats on a rubber or plastics sealing ring 3102 which sits within a channel at the top of an inner wall 3103 inside the outer rim of the baseplate. As described herein before, the lens cover 3100 is tightened down onto the sealing ring so that the sealing ring provides an airtight and spark proof seal between an outer portion of the lens cover and the baseplate of the lighting module. The lens cover may be countersunk relative to the outer perimeter of the baseplate, or alternatively the outwardly facing surface of the lens cover may coincide with a plane defined by the upper surface 3104 of the outer wall of the baseplate so that the face presented by the cover plate is flush with the face presented by the outer peripheral walls 3104 of the baseplate. The plurality of screws are arranged to secure within a plurality of threaded bores positioned in a channel between the outer wall 3104 and the inner wall 3103 on top of which sits the sealing ring 3102, so that there are no holes or apertures in the lens located above the cavity 3105 in which the light-emitting diodes and circuit board reside.

[0083] Also shown in figure 31 in cut away view are the heat sink fins 3106 at the rear of the baseplate, in this case, formed as an integral component with the baseplate from the same mass of metal.

[0084] Referring to figure 32 herein, there is illustrated schematically an alternative embodiment lighting module having a relatively thicker lens cover 3200. The relatively thicker lens cover 3200 locates on a sealing ring 3102 located in a channel which is inside of the outer peripheral perimeter wall of the baseplate as hereinbefore described. However in this case, because the lens cover is slightly thicker, it may protrude beyond plane defined by the upper surface 3103 of the perimeter wall around the outside of the baseplate. By using a relatively thicker and therefore more rigid lens cover, a more even pressure may be applied on the sealing ring 3102 within the channel at the outsides of the baseplate, by the pressure of the peripheral screws 3201 which extend through the lens cover 3200 and secure into a threaded apertures located in a moat like channel inside the outer peripheral wall 3203 of the baseplate, thereby increasing the quality of seal and reducing the chance of any spark or burning components within the lighting module being able to contact gases surrounding the outside of the lighting module and thereby improving the explosion proof rating of the lighting module.

[0085] By ensuring that all electrical components are contained within the baseplate and outer lens cover and by ensuring there is a high quality seal between the lens cover and the baseplate, electrical components are isolated from any gases which may surround the outside of the lighting module, so that even in the event of failure of an electronic component within the lighting module, the risk of a spark or fire caused by the lighting module causing an explosion in the external ambient gases around the lighting module is minimised.

[0086] Whilst the embodiments described herein disclose a lighting module having in plan view a generally square outer perimeter, enabling a plurality of like modules to be connected together in a tiled arrangement, in other embodiments, the lighting module may have another shape in which a plurality of modules are capable of being connected together in a tiled arrangement. For example, the outer perimeter may be rectangular, triangular, octagonal, quadrilateral, or trapezoidal.

[0087] In the embodiments disclosed herein, there is provided a new lighting module product which can be used to create luminaires of varying dimensions and power outputs. The individual modules can be interconnected using a connection device which provides both mechanical and/or electrical connection between the individual lighting modules. Each module needs only one electrical connection to an adjacent module in order to receive AC power.

[0088] Because the lighting modules use AC light-emitting diodes, this means that the weight of a DC LED driver is now unnecessary, and reliability may be increased, because the DC LED driver is the most unreliable component of a known DC LED lighting unit. The connector pieces connecting the lighting module is together are designed to be ’’click fit”, so that modules can be connected together or disconnected from each other without the need for any special tools. This may have the advantage that an operative installing the modules does not need to carry special tools, which makes fitting of modules or replacement of modules easier and safer, particularly when working at height such as on a crane gantry, or when the maintenance or fitting operator is abseiling or otherwise supported at heights of 100 m or more above the ground.

[0089] In the embodiments disclosed herein, each individual lighting module is nominally 60 W output, and produces around 7000 Im. Each square or block -shaped lighting module has dimensions in the range width 195mm to 205mm; breadth 195mm to 205mm; height 60mm to 80 mm and preferably the dimensions are around width 200 mm x breadth 200 mm x height 70 mm. Preferably the weight of a module is in the range 2.0 to 2.3 kg and preferably weighs around 2.0 kg. By combining a two-dimensional array of 9 x 60W individual modules this can give a luminaire of light output around 63,000 Im. A prior art luminaire of this light output would typically weigh around 25 kg. However by using lighting modules as disclosed herein, an equivalent luminaire may have a weight of around 13 kg, and hence the embodiments disclosed herein provide a significant weight saving over the prior art luminaire. By reducing the weight of the luminaire, this means that the cost of lighting installations can be significantly reduced because the supporting structures, e.g. upright poles need not be as robust and therefore as well as being less expensive, may be easier to install and maintain. For other types of structures, such as crane gantries or mounting of luminaires on roof beams, the reduced weight of the luminaire means that lighter mounting brackets can be used.

[0090] Further, by providing a reduced weight luminaire of equivalent light output as compared to the prior art luminaires, installation of the luminaires is made easier since there is less weight for an operative to carry when working at heights of 100m or above ground level.

[0091] Use of a single block of material as a multiple lens for an array of light sources, allows a single thick layer of material to cover the individual light emitting diodes. This has an advantage in making the lighting module is resilient to explosions, and means that it is relatively easier to make the lighting module which complies with category 2 explosion -proof safety specifications. However, in alternative versions, by making the lens thinner, a less expensive and lighter version may be provided, without the explosion proof capability.

[0092] By provision of a unitary construction baseplate having a cavity covered by a lens plate, with a rubber or plastics seal there- between, the embodiment lighting models disclosed herein may comply with IP 67 criteria, being a waterproofing criteria which broadly speaking is jet wash proof, or alternatively IP 68, being a waterproofing criteria which enables operation when submerged in water.

[0093] The embodiments disclosed herein may provide an improvement on prior art lighting modules by giving 40% more lumens for the same surface area of lens, and/or a reduction to around 69% of the weight of the prior art device, for the same illumination power. In the case of an array of 2 x 5 lighting modules as described herein, having a weight of around 20 kg, this provides an equivalent light output to the applicant’s prior model 168 lighting installation, which weighs around 29 kg.

Claims (43)

Claims

1. A lighting module comprising: a base plate; a circuit board comprising a plurality of light emitting diodes arranged in an array; and a lens, wherein said baseplate comprises at least one connection region for connecting said base plate to an adjacent lighting module.

2. The lighting module as claimed in claim 1, wherein said baseplate comprises a plurality of sides, and each side has its own separate said connection region.

3. The lighting module as claimed in any one of the preceding claims, wherein said circuit board is capable of being electrically connected to an adjacent circuit board of an adjacent like module, via an electrical connector which is located at said connection region.

4. The lighting module as claimed in any one of the preceding claims, wherein said connection region is adapted to cooperate with a separate connection member for connecting said base plate to an adjacent like baseplate of an adjacent like lighting module.

5. The lighting module as claimed in any one of the preceding claims, wherein said connection region is bounded by a peripheral wall extending in a direction perpendicular to a main plane of said base plate.

6. The lighting module as claimed in any one of the preceding claims, wherein said connection region comprises an upright protruding stud for engagement with a separate connecting member.

7. The lighting module as claimed in any one of the preceding claims, wherein said connection region comprises a truncated substantially triangular shape.

8. The lighting module as claimed in any one of the preceding claims, wherein said connection region comprises a region for containing an electrical contact plate.

9. The lighting module as claimed in any one of the preceding claims, wherein said connection region comprises a region for containing an electrical plug socket.

10. The lighting module as claimed in any one of the preceding claims, comprising a plurality of connection regions, each connection region comprising a substantially truncated pyramid shaped area bounded by an upright wall extending around said area.

11. The lighting module as claimed in any one of the preceding claims, wherein a said connection region comprises a protruding stud member.

12. The lighting module as claimed in any one of the preceding claims, wherein a said connection region comprises an aperture, through which an electrical connector member may be passed.

13. The lighting module as claimed in any one of the preceding claims, wherein said base plate comprises a substantially symmetrical main body bounded by a plurality of symmetrical sides, thereby allowing a plurality of said base plates to be arranged in a tiled arrangement adjacent each other.

14. The lighting module as claimed in any one of the preceding claims, wherein said light-emitting diodes are alternating current light-emitting diodes.

15. The lighting module as claimed in any one of the preceding claims, wherein said circuit board is an alternating current circuit board comprising a live conductor and a neutral conductor.

16. The lighting module as claimed in any one of the proceeding claims, wherein said base plate comprises an externally presented heat sink for conducting heat generated by said module into ambient air.

17. The lighting module as claimed in any one of the preceding claims, wherein said base plate comprises a substantially flat region for contacting an underside of said circuit board and a heatsink, so that heat generated by said circuit board conducts through said baseplate and is dissipated externally of said lighting module by said heatsink .

18. The lighting module as claimed in any one of the preceding claims, wherein said lens comprises a unitary block of transparent material comprising a plurality of individual light focusing elements.

19. The lighting module as claimed in any one of the preceding claims, wherein said lens comprises: a substantially flat upper surface, and a lower surface comprising a plurality of individual convex protrusions, each acting as an individual lens.

20. The lighting module as claimed in any one of the preceding claims, wherein each said light-emitting diode generates a corresponding respective light beam, said light beam having a beam angle in the range 30° to 45°, said beam angle being an angle at which a power intensity of said light is 50% of the power intensity measured in a direction perpendicular to a main outer surface of said lens.

21. The lighting module as claimed in any one of claims 1 to 19, wherein said light-emitting diode generates a corresponding respective light beam which is focused to be substantially perpendicular to a main outer surface of said lens.

22. The lighting module as claimed in any one of the preceding claims, wherein: said baseplate comprises a recessed central portion surrounded by an inner wall; inner wall and an outer wall; and said lens is mounted on top of said inner wall, with a flexible seal positioned between said inner wall and said lens to form a gas tight seal between said lens and said inner wall.

23. The lighting module as claimed in claim 22, wherein said baseplate comprises an outer wall surrounding said inner wall; and said lens is secured on top of said inner wall by a plurality of screws passing through said lens at a location between said inner wall and said outer wall.

24. A connecting member for connecting together a plurality of lighting modules, said connector comprising: a substantially flat base portion having a peripheral wall extending around said base portion; said wall comprising a plurality of wall portions formed in the shape of a truncated triangle; and an internal cavity for receiving an upstanding pillar.

25. The connecting member as claimed in claim 24, wherein said internal cavity comprises a substantially frusto-conical shaped cavity.

26. The connecting member as claimed in claim 24 or 25, comprising a further internal cavity, in which said internal cavity for receiving an upstanding pillar is located, said further internal cavity being within said wall portions.

27. The connecting member as claimed in any one of claims 24 to 26, comprising at least one electrical connector presenting a pair of electrical conductors at an outer perimeter of said connecting member.

28. The connecting member as claimed in any one of claims 24 to 27, further comprising a cover adapted to fit around a periphery of said portions.

29. The connecting member as claimed in any one of claims 24 to 28, having a substantially butterfly shaped body.

30. A connector for connecting together a plurality of lighting modules, said connector comprising: a main body comprising a first end, a second end and a central portion between said first and second ends; wherein said first and second ends are each wider than said central portion; and a central engagement portion for engaging with a baseplate of the lighting module.

31. The connector as claimed in claim 30 , comprising at least one upright engagement stud for engaging with a corresponding upright stud member of a baseplate of a said lighting module.

32. The connector as claimed in claim 30 or 31, comprising a plurality of engagement studs for engaging with a plurality of corresponding upright stud members of one or more base plates of one or more lighting modules.

33. The connector as claimed in any one of claims 30 to 32, which is symmetrical about a plane bisecting said connector.

34. The connector as claimed in any one of claims 30 to 33 having a substantially bow tie shape in plan view.

35. A lighting apparatus comprising: a plurality of lighting modules each shaped so as to be capable of being connected together in a tiled arrangement; and a plurality of connector members for connecting together said plurality of lighting modules; wherein said plurality of lighting modules are connectable to each other using one or more of said plurality of connector members, each said connecting member extending between a respective first and second lighting module to connect said lighting modules together.

36. The lighting apparatus as claimed in claim 35, wherein said connector member comprises a mechanical connecting member.

37. The lighting apparatus as claimed in claim 35 or 36, wherein a said connecting member may serve to connect first and second lighting modules both mechanically and electrically.

38. The lighting apparatus as claimed in any one of claims 35 to 37 comprising an array of AC light-emitting diodes.

39. The lighting apparatus as claimed in any one of claims 35 to 38 wherein said lighting modules are connectable to each other and disconnectable from each other manually by an operator, without the use of tools.

40. The lighting apparatus as claimed in any one of claims 35 to 39, wherein said connector members have an overall butterfly or bowtie shape.

41. The lighting apparatus as claimed in any one of claims 35 to 40, in which said lighting modules are connectable to each other using said connector members without the use of tools.

42. The lighting apparatus as claimed in any one of claims 35 to 41, wherein a first said module provides an electrical power supply to a second set module, upon connection between said first and second modules.

43. The lighting system as claimed in any one of claims 35 to 42, in which connection of an external power supply to a single module provides power to all said modules within said lighting system.