GB2526801A

GB2526801A - Lighting Unit

Info

Publication number: GB2526801A
Application number: GB1409782.8A
Authority: GB
Inventors: Samuel Albert Daniel; Philip Mark Beaver
Original assignee: EVENT CONCEPT Ltd
Current assignee: EVENT CONCEPT Ltd
Priority date: 2014-06-02
Filing date: 2014-06-02
Publication date: 2015-12-09
Anticipated expiration: 2034-06-02
Also published as: GB2526801B; GB201409782D0; WO2015185881A1

Abstract

A wirelessly operable LED lighting unit 1 includes a rechargeable battery arranged within a main housing 10, and a light source arranged in a tiltable and rotatable lamp housing 20 coupled to a first surface of the main housing. An antenna 16 receives remote control signals for the lighting unit. A second surface of the main housing is removably securable to a suitable clamp or clasp (30, Fig. 3B) for suspending the lighting unit from a bar or rail for lighting a venue from above. The unit is provided with a carrying handle 12 and heat sink 28.

Description

LIGHTING UNIT

This invention relates to portable lighting, and particularly to lighting units suitable for lighting events.

ncreasingly, events are held in a variety of venues, many or which are not designed with the hosting of events as a primary purpose. For example, an event may be held in a museum, a gallery or a stately home, or in an individual's house or garden or other out of doors location. In such cases, there may be little or no provision of permanent, specialist infrastructure for event production, and in particular for the installaUon of lighting for the event.

At the same ume, the scale on which some events are held is increasing There is often a need to Ught a room ftom multiple points in all three dimensions; consequently, it is common for lighting units for an event to be suspended or otherwise posffioned at various heights.

Thus, events designers are required to conceive of ever-more innovative and practical lighting solutions in view of the conflicting needs to ensure a suitable power supply and the ability to control the lighting, whilst respecting both health and safety requirements and the need to achieve satisfactory presentation In the past, lighting units have been powered and controlled during an event by means of appropriate cables. However, this makes the installation of the lighting time-consuming and involved, increasing costs and generally being inconvenient for the host of the event.

Furthermore, the use of wired lighting, in particular in a hanging or suspended configuration, often presents a hazard and is unaesthetic, requiring the designer to go to great lengths to hide the cables from view. This is especially so in the case of larger-scale events in which many individual units may be positioned throughout a room, some of which may require long lengths of cable from limited power connection or control points.

Recently rechargeable, batterf powered wireless lighting units have been prcvded to overcome some of these problems. GB 2484758 discloses one such unit. As shown in Figure 1 The battery operated remote controllable uplighter 910 of GB 758 comprises a housing 920 including an upper surface 950, in the centre of which is arranged an LED light 960 An antenna 980 for receiving control signals is located in a corner of the upper surface.

However, this and the other wireless units currently available are unsuitable for use in a suspended configuratIon. These units are typically large in size, heavy and generally cumbersome, so as to be limited to use as floor-standing uplighters. The applicability of the lighting unit of GB 758 in particular is further restricted due to the limited range of directionahty of the light source 960 In audition, the battery lifetime and other technical specifications of the wireless lights currently on the market can be inadequate for many events, these units often being economically inefficient to run and requiring frequent replacement.

Thus, it would be desirable to provide an improved lighting unit for use, for example, in event production.

The invention is defined in the independent claim, to which reference is now directed.

Preferred features are set forth in dependent claims.

According to the invention there is provided a wirelessly operable lighting unit comprising a housing, a battery arranged within the housing, an antenna for receiving control signals for the lighting unit, and a lamphouse coupled to a first surface of the housing, the lamphouse housing a light source A second surface of the housing is configured for coupling to suspension means for suspending the lighting unit in a hanging configuration The lighting unit may be, for example, a wash light.

Embodiments of the invention may advantageously provide a lighting unit that can be used in a suspended configuration without any need for a connection to a mains power supply or to control wiring. The installation of hanging lighting at an event venue may therefore become more straightforward and less time-consuming. Since fewer skifled technicians may be required, events that make use of hanging lighting units may also be arranged and hosted in a more cost-effective manner. In addition, the need for visually unpleasing and potentially hazardous wiring when using suspended lighting may be removed.

Furthermore, the lighting may be controlled remotely during the event. In this case, the entirety of the lighting effects employed in the event may be adjusted without the need to interrupt the event itself notwithstanding the absence of any cables or wiring to one or more external control points Thus, it may become possible to increase the range of ighting effects that can be employed when designing an event to be staged in a totally wireless fashion.

In preferred embodiments of the invention, the kghting unit may further be used in a standing position as an upflghter. Thus, a multi-purpose lighting unit of improved flexibility may be provided. This may mean that fewer specialist designs of fighting unit are required to achieve the range of functionality and effect that can be required in designing and hosting an event, such that the installation of an event may be simplified still further According to some embodiments of the invention, a bracket is removably attachable to a second surface of the housing for receMng the suspension means for suspending the lighting unit With this arrangement, the hghting unit may be configured for hanging or for use in a standing position, as appropriate, in a quick and straightforward manner.

Preferably, the lamphouse is tillable with respect to the first surface of the housing. This may be especially advantageous in the context of ceiling lighting, where the possib'e positions of a bar or rail from which the lamp is to be hung may be Rmited. In addition, it may not oe easy or even possible to adjust the argle at which the housing itself is mounted to the rail By arranging the lamphouse to Lilt relat've to the housing, it may nonetneless become possible to direct the light as desired.

In preferred embodiments of the invention, the lamphouse is mounted on a yoke, the yoke being coupled to the first surface of the housing. In this case, the amphouse may be made to tilt through a wide range of angles, such that the flexibility of the lighting unit may be improved.

In some embodiments, the lamphouse is rotatable with respect to the first surface of the housing, so as to effect a panning motion. In this way, the span of points that may be lit by the unit may be increased still further. It may also become easier in this instance to direct the light emitted by the unit as desired. In particular, the light emitted by the light source may be directed to any point within a solid cone without the need to angle the housing of 2 the lighting unit relative to the bar or stand from which it is hung which, as mentioned, can be comparatively difficult. In addition, to direct the light output by the lighting unit by rotating the housing itself about the clamp by which it is suspended can mean that the front lace and its display panel become visible to guests of an event, which can be undesirable.

According to embodiments of the invention, the lighting unit may be suspended in a most aesthetically preferred position at the outset, there being no need to move it from that position to achieve desired lighting effects during an event. Where the lamphouse is mounted on a yoke, the rotational degree of freedom may be realised by configuring the yoke itseI to rotate relative to the housing Preferably, the lighting unit further includes a detachable barndoor shutter accessory, which may provide increased control of the Hght bear emitted by the unit. The barndoor may comprise a bezel attachable to the Iron' of the lighting unit, and a plurality of articulated doors or wings coupled to the bezel for shaping and directing the light beam in use.

In some embodiments, the light source is an LED light source. In these examples, the lighting unit further comprises an LED driver for the light source, the driver being arranged witftn the laniphouse, An LED light source may be preferred over conventional light sources such as fluorescent or incandescent lamps as LED technology may provide a light source of improved lifespan, which also benefits from reduced Dower requirements and lower operating costs As is Known to those in the art LED lighting is additionally increasingly preferred on account of its reduced environmental impact with respect to conventional lighting technologies.

Preferably, the I ght source ircludes a plurality of LEDs, at least one of which is configured to emit light having a range of wavelengths different to that of the light emitted by at least one other of the LEDs. In this case) the lighting unit further comprises a colour mixing regulator circuit arranged within the lamphouse for controlling the output of the light source.

Thus, a colour mixing unit may be provided, which may have a wider range of aoplication than a lighting fixture capable of outputting white light or light of a single other colour only.

In some embodiments, the LED light source is a multi-chip LED light source. In this case, since a plurality of LEDs is integrated into a single package, light having a high intensity and/or varying wavelengths may be produced without unduly increasing the weight of the light source or the degree of packaging material required In addition, the removal of heat radiated by the light source may he made more efficient, and the LEDs may further be powered by a single driver. Multi-chip LED technology is known to provide light sources having a long lifetime and a comparatively low cost. Additionally, use of a single light source and lens can mean that problems associated with the qeneraton of multiple shadows from a plurality of light sources included in a single unit are avoided.

According to preferred embodiments of the invention, the battery is rechargeable and the lighting unit further comprises means for connecting the battery to an external power supply, whereby the battery may be charged without being removed from the housing By removing the need to replace the batteries or to remove them for recharging, repeated use of the lighting unit of these embodiments may be more efficient and less time-consuming

S

than has previou&y been the case. In addition, the housing may be substantially sealed, such that penetration by water, dust or other contamination that may adversely affect the operation of the unit may be reduced or avoided.

Preferably, the battery is a lithium iron phosphate (or lithium ferrophosphate, LFP) battery.

This chemistry can provide an advantageously long battery life, such that the lighting unit may be powered for muitiple hours before Ft becomes necessary to recharge the battery. ln addition, the oattery may be subjected to an increased number of charging and discharging cycles before its operation becomes inefficient or unreflable. Furthermore, LFP battery technology is currently tie most environmentally frienoly available The battery in these examples may also be Ught in weight, which is particularly advantageous where the lighting unit is to be used in a hanging configuration.

Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings in which: Figure 1 is a perspective view of a battery-operated remote controllable uphghter of

the prior art;

Figure 2 is a schematic illustration of a lighting unit according to one embodiment of the present invention; Figure 3A is an alternative view of the lighting unit of the embodiment shown in Figure 2; Figure 3B illustrates the lighting unit of Figures 2 and 3A in use with a suitable (third party) clamp for suspending the I ghting unit, Figure 4 is an exploded view of a lamphouse of the lighting unit of F gures 2, 3A and 3B; Figure SA is a perspective view of a barndoor accessory suitable for use with a Ughting unit according to the invention, in an open configuration; and Figure SB is a perspective view of the barndoor accessory of Figure 5A in a closed configuration.

Figure 2 is a schematic illustration of a wireless lighting unit I according to one embodiment of the present invention In this embodiment the ighting unit is used as a wash hght, either in a standing position on a floor or other surface, or in a hanging configuration, as will be described.

As shown, the unit 1 includes a housing 10 at its base. The housing is of substantially square cross-section. having rounded corners for reasons of safety and aesthetics, and encloses a rechargeable battery (not shown) that provides electrical power for the hghting unit, as will be described below. In this example, the housing is made of a substantially rigid, lightweight metal such as aluminium, and is sealed along its edges to prevent the ingress of water, dust or other external substances that cOuld potentially damage the battery. In other embodiments, the shape, size and material of the housing could be varied as appropriate. For example, the housing could be made from polycarbonate, acrylic or any other suitable material. Though not essential, it is preferable for the housing to be made from a rretal or other material having a relatively high thermal conductivity In this case, the heat generated by the battery and circuitry contained within the housing may be dissipated efficiently through the wails of the housing itself. Consequently, it can become possible to reduce the size of the housing and thus the weight of the unit as a whole, since the need to include substantial volumes of air in the regions surrounding these components can be reduced. As a result, suspension of the unit may be made more safe, and it may be easier to suspend a plurality of units from a common bar or rigging if this is desired, Also shown in Figure 2 are an optional carrying handle 12 for ease of transfer and suspension of the unit, and a user input/output interface 14 and antenna 16, each of which may be used to control the output of the lighting unit as discussed below.

23 A lamphouse 20 housing a hght source (not shown) is tiltably coupied to one surface of the housrng 10 Specifically, in this example the lamphouse is mounted on a yoke 22, of substantially square U-shape, that is coupled to the surface of the housing by means of a suitable screw 24 or by any other appropriate fixing means, such as a nut-and-bolt arrangement, The lamphouse is configured to receive, at opposite ends of one diameter, suitable pins 26 or other coupling means that pass through the upper ends of the yoKe to hold the lamphouse in place within the yoke Thus, the lamphouse may tilt relative to the housing, such that the lighting unit may direct light to the desired area or spot within a venue. Moreover, in this instance the yoke 22 is also itself rotatable around the screw 24 for increased freedom of movement and range of directionafity of the lamphouse, though this is not essentiaL Further, in other embodiments any suitable alternative arrangement, such as a ball joint, could be used to realise both tilting and rotational degrees of freedom of the lamphouse with. respect to the surface of the housing.

As shown, the lamphouse in this embodiment further includes a heatsink 28 for dissipating the heat generated by the light source and is mounted within the yoke such that, when the lamphouse is ri an upright position, there is a space between the base of the heatsink and the top surface of the housing 10. This ensures ease of movement of the lamphouse through a wide range of anges as weD as efficient rathation of heat away from the heatsink.

Figure 3A shows the underside of the fighting unit 1 of the embodiment shown in Figure 2.

A four-pin power connector 11 is provided towards one corner of the base of the housing, by means of which the battery may be charged without needing to be removed from the housng For example the battery could be charged by means of a sLutable power cable that connects the unit to a mains power supply. Alternatively, the unit as a whole may be placed in a suitable charging dcxk or cradle which may optionally be configured for charging a plurality of lighting units such as the unit I simultaneously. In this case, the battery may connect automatically to a charge supply connector when the unit is positioned in the dock. Thus, in this embodiment the lower portion of the housing 10 can also be sealed as described above to isolate the components internal to the housing from the external environment. In this example, the battery is an 18 V lithium iron phosphate battery having a capacity of 10 Ah. As mentioned above, batteries of this chemistry are advantageous in terms both of the achievable runtime of the lighting unit and of the usable service lifetime of the battery itself. In this example, when used in conjunction with an LED light source such as that described below, the battery may power the unit for around 7 hours or more between charges, and may furthermore be capable of around 2000 or more charge/discharge cycles. Thus, the lighting unit may be economically efficient to use, in addition to having a comparative:y low environmental impact The recess in which the power connector is provided is preferably made of stainless steel, so as to be advantageously reactant to wear as the battery is repeatedly charged In other embodiments, however) any other suitable battery or combination of batteries could be used as desired. Furthermore, whilst it is preferable to configure the lighting unit of the invention such that the battery may be charged within the housing as described, this is not essentiaL Further shown in F'gure 3A are four optional rubber feet 13 for stabilising the unit when tt is used in a standing position as an uphghter, and a detachable bracket 15 that is removab y fixed to the underside of the unit by means of two suitable screws 17 for use in hanging the unit upside-down frorr a suitable bar, rail or any other supporting means that may be available at an evert venue Specifically, a centre porion of the bracket includes a hole 19 for attaching any suitable clamp or clasp for suspending the unit from supporting means as required. Figure 3B shows the lighting unit I of the present embodiment in use with one

B

such clamp 30, which does not form part of the invention. As can be seen in Figures 3A and 3B, the central portion of the bracket 15 is separated from the underside of the Ughting unit, for ease of attachment of the damp. The bracket 15 in this embodiment is made of steel, though any other metal or suitable material could be used. Furthermore, as wifl be apparent to the skiUed person, whilst in this example it is the underside of the unit 1 that is configured to receive the bracket 15, and thus to be coupled to suspension means in the form of a damp such as that shown in Figure 3B. this is not essential. in other embodiments, any of the other main surfaces of the housing could be configured in a similar way such that the preferred hanging arrangement may be realised.

Figure 4 is an exploded view of the lamphouse 20 of the lighting unit 1. As shown, the amphouse includes a recess 200 coupled to the heatsink 28. In this embodiment, the amphouse recess and heatsink are fabricated from machined aluminium which, as is known to those in the art, may provide advantageous thermal properties at a comparatively ow cost. in alternative embodiments, however, any other material having a suitably high thermal conductivity such as an aluminium alloy or copper could be used. Furthermore, the heatsink is ala standard construction, known to those of skill in the art.

In use, a printed circuit board 210, which includes a light source 215, and a collimator 220 are mounted in the recess 200, and are held in place by means of a fused qu&tz lens 230, which may improve the optical characteristics of the lighting unit, an optional silicone or rubber seal 240 and an aluminium bezel 250, which is fixed to the body of the lamphouse by screws 255 or other suitable fixing means Thus, similar o the housing 10 described above, in this example the lamphouse may oe sealed against external contamination to prevent any damage to the light source components.

In this embodiment, the light source 215 is a 40W multi-chip LED light source. As discussed above, LED5 are preferred over more conventional lamps in view of their comparatively low power requirements and long service lifetimes. Other embodiments, however, may use a fluorescent or incandescent light source, as desired Moreover, whilst it is presently preferred to use a multi-chip LED package such as that shown in Figure 4, as discussed above, this is not essential, and in still further embodiments a single LED may be used, or alternatively a plurality of LEDs may be arranged as a distriDuted array In this example, the circuit board 210 is configured to operate as a driver for the LED light source 215 and is powered by means of an eight core supply cable, not shown in the drawings, that exits the housing 10 through a cable gland coupled to the surface of the housing, passes through the fin arrangement of the heatsink 28 into the recess 200 of the lamphouse and is connected directly to the circuit board 210. The cable is also configured to carry control signals for the Ught source, as described below.

Furthermore, the lighting unit 1 according to the present embodiment is configured as a rrulti-colourligh' Thus, the LED package 215 includes LEDs havrig a range of output wavelengths, the circuit board 210 being further arranged as a colour mixing regulator circuit that controls the output of the right source in response to input from a user SpecificaUy, the light source 215 includes LEDs emitting each of red, blue, green and white hght As shown in Figure 2, the lighting unit I includes a rive button keypad and an LED output display arranged as user inpuVoutput interface 14 on one surface of the housing, which may be used to turn the unit on or off, to program or to access pre-set modes of operation, or otherwise to configure or customise the unit for a user's particular application requirements. In addition and as mentioned above, an antenna 18 included on the housing is configured to receive radio frequency remote control signals, such as DMX signals, from a compatible wireless transmitter. Returning to Figure 4, these control signals are roayod to the pnnted circuit board 210 through the cable that passes from the housing to the lamphouse as described above to adjust the output intensity of various LEDs within the light source 215 and, thus, the colour and intensity of the light output by the lighting unit.

Though the antenna 18 in the embodiment of Figure 2 is arranged on the upper surface of the housing 10, in alternative embodiments the antenna could instead be positioned on any of the other main surfaces of the housing as desired and as appropriate, as will be clear io those of skiH in the art.

Though not essential, the lighting unit of the present nvention preferably includes a detachable barndoor accessory for increased control in shaping the light beam ol the lighting unit. Figures 5A and SB illustrate one example of such a shutter attachment 40 in an open and a closed configuration, respectively. As shown, the barndoor 40 includes a bezel 42 of a substantially flat, annular shape that is attached to the lamphouse of the lighting unit by means of suitable clips 44. Four articulated doors or wings 46 are coupled to the front of the bezel via hinges 48. In use, these wings are positioned by the user to shape and direct the light beam as desired. For instance, the wings may be arranged so as to exclude a specific area within a generally lit space from illumination. As discussed above, the ab'lity to control and to direc the light emitted is particularly advantageous in the case of a lighting unit that is to be used in a hanging configuration, where it may not be easy or even possible to alter the position in which the unit itse'f is arranged The barndoor in this example is made of anodized aluminium, though any other suitable material could be used. Furthermore, other examples may make use of a magnetic arrangement instead of the clips 44 to attach the barndoor to the front of the lamphouse. In addition, whflst the wings 46 are each shown in Figure SA as having a substantially trapezoidal shape that widens with distance from the bezel, in other examples other shapes or combinations of shapes could be used as appropriate for a particular applicationThus, the invention combines means for affixing a suspenson arrangement, a lightweight battery and a wireless control arrangement to provide a lighting unit capable of total wireless operation that is suitable for use in a hanging configuration

Claims

CLAIMS1. A wirelessly operable fighting unit comprising: a housing; a battery arranged wfthin the housing; an antenna for receiving remote control signals for the lighting unit, and a lamphouse coupled to a first surface of the hou&ng, the lamphouse housing a light source; wherein a second surface of the housing is configured for coupling to suspension means for suspending the lighting unit in a hanging configuration.
2. A lighting unit according to claim 1, wherein the Eamphouse a configured to tilt with respect to the first surface.
3. A fighting unit according to claim 2, wherein the lamphouse is configured to rotate with respect to the first surface.
4. A lighting unit according to any preceding claim, wherein the lamphouse is mounted on a yoke, the yoke being coupled to the first surface of the housing.
5. A lighting unit according to claim 4, wherein the yoke is rotatable with respect to the housing.
6 A lighting unit according to any preceding claim, wherein the light source is an LED light source and the lighting unit further comprises a driver for the LED light source, the driver being arranged within the lamphouse.
7. A lighting unit according to claim 6, wherein the LED light source comprises a plurality of LEDs, at least one of the LEDs being configured to emit light ha1ng a range of wavelengths different to that of the light emitted by at least one other of the LEDs, the lighting unit further comprising a colour mixing regulator circuit arranged within the arnphouse for controlling the output of the light source.
8. A lighting unit according to claim 6 or claim 7, wherein the LED Ught source is a multi-chip LEO light source.
9. A lighting unit according to any preceding claim, wherein the battery is rechargeable and the Ughtirig unit further comprises means for connecting the battery to an external power supply, whereby the battery may be charged without being removed from the housing.
10. A lighting unit according to any preceding claim, wherein the battery is a lithium iron phosphate battery.
11. A lighting urtit according to any preceding claim, further configurable for use in a standing configuration as an upflghter.
12 A hghting unit according to any preceding claim, wherein a bracket is removably attachable to the second surface for receiving the suspension means for suspending the lighting unit.
13. A lighting unit according to any preceding claim, further comprising a handle coupied to one of the surfaces of the housing.
14, Alighting unit according to any preceding claim, further comprising user interface means for manual control of the lighting unit by a user.
15. A lighting unit according to claim 14, wherein the user interface means comprise a keypad for user input and/or a display for displaying output to the user.
16. A lighting unit according to any preceding c[aim, further comprising a lens, the lens being arranged within the lamphouse.
17. Alighting unit according to any preceding claim, wherein the lamphouse further comprises a heatsink for the light source.
18. A lighting unit according to any preceding claim, wherein the lighting unit is a wash light.
19. A lighting unit substantially as described herein with reference to Figures 2 to 5B of the accompanying drawings.