GB2566108A

GB2566108A - Variable beam angle lighting unit

Info

Publication number: GB2566108A
Application number: GB1714258.9A
Authority: GB
Inventors: Michael Robinson Adam; Joseph John Slevin Peter; Anthony Reynard Paul
Original assignee: Kinace Innovations Ltd
Current assignee: Kinace Innovations Ltd
Priority date: 2017-09-05
Filing date: 2017-09-05
Publication date: 2019-03-06
Anticipated expiration: 2037-09-05
Also published as: GB201714258D0; GB2566108B

Abstract

A variable beam angle lighting unit comprises a housing 1 having a central symmetry axis, a support 8 located in the housing, a main lamp 7 located axially on the support 8, and a plurality of secondary lamps 9 located on the support 8 and arranged in one or more arrays around the main lamp 7. A front casing 16 defines a central aperture 19. A light guide member 22 is located in the housing 1. The light guide member 22 comprises a main lens 23 and light guide elements 24 located radially outwardly of the main lens 23. Each light guide element 24 has a light guide inlet proximate a secondary lamp array 9, and a light guide outlet. The main lens 23 is arranged to provide a main beam along the central symmetry axis with a main beam angle, and the light guide elements 24 are arranged to provide outer peripheral beams radially outwardly away from the central symmetry axis;

Description

VARIABLE BEAM ANGLE LIGHTING UNIT

The present invention relates to a variable beam angle lighting unit suitable for mounting on a ceiling, wail, panel or other fixture, particularly but not exclusively within a 5 cavity formed in the fixture. More particularly, but not exclusively, the present invention relates to a variable beam angle lighting unit comprising a LED lamp array.

Commonly available spotlights incorporate a lens or sets of lenses which to produce a light beam with a specific beam angle. If for example the beam angle is insufficient to illuminate a given area, the user must replace the spotlight with an alternative spotlight that 10 provides the desired beam angle coverage.

Variable beam angle spotlights are commercially available and provide variable beam angles through use of a variable focal length lens arrangement, similar to the arrangement used with camera lenses. These arrangements are cosily, greatly increase the size of the lighting unit and require moving parts which decreases the reliability of the 15 spotlight.

Alternatively, spotlight beam angles may be controlled by restricting the passage of light through a variable aperture. These systems are unreliable however ami result in loss of light output.

The present invention seeks to address the problems of the prior art.

According to the invention a light unit comprises:

a housing having a central symmetry axis:

a support located in the housing;

a main lamp located axially on the support;

a multiplicity of secondary lamps located on the support and arranged in one or more arrays around the main lamp;

a front casing defining a central aperture;

a light guide member located in the housing, the light guide member comprising:

a main lens having:

a main light inlet proximate the main lamp; and a main light outlet;

the main lens being arranged to allow passage of light through the mam lens and out of the central aperture; and one or more light guide elements located radially outwardly the main len each light guide element having:

a light guide inlet proximate a secondary lamp array; and a light guide outlet:

each light guide outlet being arranged to allow passage of ect light through: the respective light guide element and out of the housing;

the main lens being arranged lo provide a main beam along the central symmetry axis with a main beam ancle.

the one or more light guide elements being arranged to provide one or more outer peripheral beams radially outwardly of the main beam;

wherein the light unit provides the main beam and the one or more outer peripheral beams individually or in combination with each other; and wherein the main beam and the one or more outer peripheral beams are arranged to provide a composite beam with a beam angle greater than the main beam angle.

A variable beam angle is achieved through use of the main lens and the one or more light guide elements. The main beam is directed, along the central svmmetry axis bv the main ip

If a user requires a lens at a main beam angle selected to illuminate all or part of a room.

wider beam angle, the user may provide light using a first array of secondary lamps to the light guide element located in contact with or adjacent the main lens. The light guide element provides the outer peripheral beam radially outwardly away from the central symmetry axis.

The main beam and outer peripheral beam are arranged to provide a composite beam which a user may perceive as a single beam of light. Regulating the power supplied to the main lamp '£3:

and/or secondary lamp array to brighten or dim the lamps may further enhance a user’s

One or more further light guide elements may be provided within the light unit. For example a second light guide element may be positioned next to the first light guide element distal from the main lens. The second light guide element receives light from a second array of secondary lamps which are positioned radially outwardly in contact with or adjacent the outer peripheral beams are arranged io provide a composite beam which a user may perceive first array of secondary lamps radially outwardly from tire main lamp. The main beam and as a single beam of light. This arrangement may he repeated with further light guide elements and arrays of secondary lamps. Regulating the power supplied to die main lamp and/or one, two or more secondary lamp arrays to brighten or dim the lamps may further enhance a user’s perception of a single beam of light.

The secondary lamps may be provided on a strip of material. Preferably the strip of material is annular. The strip of material may be straight or polygonal. The strip of may be attached to the support, for example by adhesive. The strip of material composed of a polymer!

The light unit heights. For example, ε naierral may be c material.

of the present invention can be used in rooms with varying roof . ...x ν_Λ«„_Ψ.ν, «* narrower beam of light is preferred in a room with a high roof as this reduces the spread of light and thereby increasing the brightness at the floor level or at a display unit. Therefore only the main, beam may be used. In contrast, a wider beam angle is preferred in a room with a low roof as this increases Ore spread of light adequately before the light reaches the floor. Therefore, both the main beam and one or more peripheral beams may be used.

room.

The light unit of the present invention cau also be used in different locations within a For example, a wide beam angle may be preferred if the light unit is positioned in a central location. Alternatively, narrow beam angles are used when the light unit is positioned close to a wall or corner.

The light unit of the present invention also allows the unit to provide general lighting using a wide beam and for spot lighting using a narrow beam.

Increasing the number of light guide elements enables the user to provide a beam with progressively increasing beam angles.

used in the light unit In an embodiment 4 to 6 light guide e'.

on liPreferably, 2 to 6 light guide elements may be ’ ’e elements may be used in the light

When using in the narrow beam configuration only the main lamp may be powered.

All light produced by the light unit will accordingly be directed through the main. lens to produce a main beam with a main beam angle.

When using in the wide beam angle configuration, both the main lamp and the one or more arrays of secondary lamps may be powered. Light is projected through both the main lens and the one or more light guide elements to produce a composite beam comprising a main beam surrounded by an outer beam. The composite/collective beam has a beam angle greater than the main beam angle.

I he above arrangement has the advantage that there art increase reliability and reduces manufacturing complexity and no moving parts. This may production costs.

variable beam angles are not provided as when one uses a arrangement, the unit size of the light unit may be decreased. Decreasing the unit size al

A further advantage of decreasing the unit size is that height of the unit may be decreased

In an embodiment, a constant power supply, for example 10W, may be provided to the main and secondary lamns to ensure a consistent brightness cutout. In an alternative A .Z A embodiment, powering the one or more arrays of secondary lamps increases the overall power of the unit and thereby increases the brightness. This may be desirable in commercial settings where application of a wide beam is typically need ed to illuminate a larger area.

In a further embodiment, power distribution to the main lamp and the one or more arrays of secondary lamps is controlled by a driver to ensure optimal light quality. The driver may comprise an adjustable power supply adapted to regulate the power delivered to the main lamp and/or arrays of secondary lamps, Accordingly, the main lamp may be dimmed and the one or more arrays of secondary lamps may be brightened. Alternately, the main lamp may be brightened and the one or more arrays of secondary lamps may be dimmed. This reduces spotting or separation of the main beam and the one or more peripheral beams when power is

A' supplied to both tlie main lamp and the one or more arrays of secondary lamps. This may help to give an overall impression to a user that the beams have been focussed. This may also allow engineers to control the mixing point of the light, beams to improve the quality of tlie light at the floor level. T he mixing point may be heightened or lowered depending on the distance of the lamn from the floor.

A employ halogen bulbs, OLED lamps or incandescent lamps.

In exemplary units the main beam may be provided at an angle between 30° to 50°, tor example between 35° to 45°, or for example about 40Greater main beam angles may also be used.

Tlie one

These beams may

The one or more peripheral beams may be provided as symmetrical beam rings, have uniform luminosity.

or more periphem relative to the central symmetry axis, between 40° to 70°. preferal peripheral beam angles may a beams may be provided at an acute or obtuse angle Preferably the one or more peripheral beams are angled tbly between 55° to 65°, even more preferably 60°. Greater so be used.

Preferably, a first peripheral beam is angled to lie proximal to the main beam.

Alternatively, the first peripheral beam is angled to partially overlap with the main beam.

Preferably, a second peripheral beam is angled to lie proximal to the first per beam. Alternatively, the second peripheral beam is angled to partially overlap with the first peripheral beam. These arrangements can be applied to third and subsequent peripheral beams.

jpiieral

The composite beam angle may be between 30° to 70°, preferably between 40° to 60°. Greater composite beam angles may also be used.

The light unit may further comprise a lamp dividing wall located in the housing, the wall having an axial array of projections extending away from the support ht guide member to prevent, the passage of light from the main lamp to the one aide elements and from the secondary dividing lamps to the- main lens.

The projections of the lamp dividing wall channel between the main lens and the light guide elements.

may extend upwardly into a recess or The projections of the lamp dividing wall may also extend upwardly into a recess or channel between each of the light guide elements. Alternatively, the projections may extend upwardly to abut the main lens or the light guide elements.

Preferably the lamp dividing wall and the front casing are integrally formed.

Alternatively the lamp dividing wall is provided separate to the front casing. Alternatively, the lamp dividing wail may be positioned directly onto the support so that the projections extend into the front casing.

The lamp dividing wall may define an axial hub dimensioned to receive the main lamp. The projections of the lamp dividing wall may extend radially outwardly away from axial aperture, in a spoked arrangement. The projections may be extend axially so that they contact the sides of the front casing or the housing. The projections may extend radially outwardly away from axial aperture through multiple light guide elements. Alternatively, the lamp dividing wail may comprise a co-axial array of the above hub-projection arrangement.

The light guide elements may have an annular body extending radially outwardly away from the light guide inlet towards the light guide outlet. The one or more light guide elements may further comprise an annular flange extending from the annular body. The light guide outlet may be located in the annular flange, preferably on a periphery of the flange.

The light guide elements may he rotationally symmetrical about the central symmetry axis. The light guide elements may be circular. Alternatively the light guide elements may be oval or may have n-fbld symmetry, wherein r s an integer, about the central axis.

The light guide outlet may be directed radially outwardly of the housing.

The main lens and the one or more light guide elements may be composed of an acrylic polymer, for example an acrylic polymer or glass, polycarbonate, glass, or other high refractive index material wherein the refractive index is selected so as to achieve total internal reflection of light passing from the light inlet to the light outlet. Alternatively, the main lens and the one or more light guide elements may be made from a composite of the above materials.

The main lens may have an annular body extending radially outwardly away from the main light inlet towards the main light outlet. Preferably the main lens is cone shaped.

The surface	s of the main lens and the one or more light guide elements may have a
reflective, opaque	or textured finish: to improve transmission of light through the lens

structures.

In an embodiment the main lens, one or more light guide elements and one or more dividers are provided as a unitary construction. Preferably the dividers are embedded within the material forming the light guide member. This arrangement ensures optical quality and avoids spotting.

In an alternative embodiment the main lens, one or more light guide elements and one or more dividers are provided as separate components. In a further embodiment the main lens and the one or more light guide elements art- provided as separate components and the main lens or the one more light guide elements are provided as a unitary construction with the one or more dividers.

Each light guide element may have a single light guide inlet and outlet. The single light guide inlet being arranged proximate an array of secondary lamps.

Alternatively, each light guide element may have a light guide inlet arranged proximate a single secondary lamp. A plurality of light guide elements may be used for an array of secondary lamps. For example a circular array of light guide elements may be if located over a circular array of secondary lamps. Each of the light guide elements may therefore produce separate peripheral beams.

In an exemplary embodiment a divider may be located between the main lens and the light imide element. This prevents passage of light from the main lens to the light guide element and from the light guide element to the main lens.

If more than one light guide element is present then further dividers may be used between each of the light guide elements. For example, a divider may be positioned between two adjacent light guide elements. The dividers prevents passage of light between the light guide elements.

The divider may be configured to channel the main beam outwardly to provide the 25 main beam angle.

The divider may be configured to channel the outer periphery beams outwardly at a given angle.

:nt light

The one or more dividers may be arranged to contact the support to prev· from escaping laterally, relative to the central symmetry axis, from the main and secondary lamps.

The one or more dividers may be arranged to extend radially outwardly away from the support towards the front casing. The one or more dividers may he composed of a reflective, v-fopaque, frosted or textured sheets or films. The dividers may be composed of a single sheet •ay of laminar sheets of materia he dividers may be provided as a coating on the main lens and/or on one or more of the light guide elements.

The dividers may be composed oi polymeric material, for example polypropylene, polycarbonate. Alternatively, the dividers may be composed of aluminium, for example aluminium sheets or tin-foil providing a reflective, opaque, frosted or textured material may improve dispersion of light by internal reflection within the light guide elements. This has the beneficial result of providing more uniform periphery beams.

Providing a frosted divider with an unpolished or matt appearance may be achieved by not polishing the guide after removal from a mould. The moulded guide may he sandblasted to remove tooling marks but not subsequently polished.

frosted surface has the advantage of reducing manufacturing costs.

T he radius of the surface feeing towards the central axis mav have a maximum value tt having a central radius curving from the light guide inlet towards the outer flange surface, in guide inlet is greater than the width in the axial direction, of the light guide outlet in order to concentrate the light beam as it passes from the light guide inlet to the light guide outlet.

One or both, of the light guide inlet and linht guide outlet surfaces may be textured to KJ KJ 'w.' <1- «· increase uniform and efficient transmission of light from the outlet.

assembly and a dual colour LED chin of 27OOK (commonly referred to as 3000K) and 6500K

A main LED may provide a full range of white light colour using a LED driver circuit (commonly referred to as 6000K). Mixing of these ivl two colours via the driver’s circuit assembly provides a colour contrast temperature (CCT) adjustable from 2700K. to 6500K..

In an exemplary embodiment the secondary lamps may comprise a circular array of ix

LED chips with a total power of 2W. Red'Blue/Green RBG or alternating 2700K. and

6500K LEDs may be used.

The primary light brightness may be controlled by increasing the power from 0 to

10W. The secondary light brightness may be controlled by increasing the power from 0 to

2W, this power being distributed across ail 16 LED drips.

The primary and secondary lights may be independently or jointly controlled to change their colour and brightness.

axis. This to a standard downliaht assembly.

Simplified construction is achieved.

a «referred embodiment has a toroidal configuration and is L-sbaped iu cross section.

computer software or a smart device application. Commands from the software or device may be communicated to an individual light unit or to groups of light units by wireless communication methods such as Bluetooth or

WiFi. However signals may also be sent through the mains power supply. The light unit may be additionally/alliteratively controlled by a physical switch on the unit, by a wall switch or by a control plate.

A heat sink may be located in thermally conductive communication with the support.

The heat sink may be located in contact with a rear surface of fhe support, so that the heat sink conducts heat directly from the main and secondary LEDs in use.

An intumescent seal may be provided between the heat sink and the housing. The sufficient temperature.

Use of a light unit in accordance with the following invention provides many benefits including the following:

1. remote control of the lights including on/off, colour and brightness control;

2. individual and group control of the lights;

3. the ability to vary the beam angle between narrow and wide beam settings;

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4. the ability to moderate the amount of power applied by the main lamp and the secondary lamps.

Example 1 - Brighter spot lights

It may be preferential to have a brighter spot light when using a narrow beam to better illuminate a point of interest, for example illuminating a display stand in a museum, retail or wholesale outlet. To achieve this, a total power deliver of 30W may be used in the narrow beam setting. When using the wide beam setting the total 30W power can be distributed between modules.

The following table provides an example using a unit with 60. 30 and 15-degree segments.

BEAM ANGLE	60 Degree Ghip Group Power	30 Degree Chip Group Power	15 Degree Chip : Group Power	TOTAL·.. POWER
60 degrees	10W	10W	I0W	30W
40 degrees	0W	15W	15W	30 W
15 degrees	ow	0W	SOW	i 30W

Example 2 - Brighter ambient lights

It may be preferential io increase lire brightness of the light as the beam angle increase to ensure an even amount ot'light is always delivered to the floor regardless of how much area the light is spread over, for example in a shop. To achieve this, a consistent 25 amount of power is delivered to lens segment unit.

The following table provides an example using a unit with 60, 30 and 15-degree segments.

BEAM ANGLE	60 Degree i 30 Degree	15 Degree Chip Group Power	TOTAL POWER
Chip Group Power	Chip Group Power
: 60 degrees	10W	10W	10W	30W
40 degrees	0W	10W	/ 10W	^:: 20W ;
15 degrees	OW	OW	* low	i low

Example 3 Creating the effect of fully adjustable beam angles

The product and resulting beam may have fixed beam angles that can be selected.

For example, 5 setting might be 70, 60, 50, 40, 30 degrees. However, when moving between settings it is possible to simulate a full adjustable angle through the distribution of power to each: segment.

The following table provides an example of power distribution to each LED chip group as the beam angle is lowered from '70 - 30 degrees.

BEAM ANGLE	70 Degree Chip Group Power	60 Degree Chip Group Power	50 Degree Chip i Group Power	40 Degree Chip Group Power	30 Degree Chip Group Power	TOTAL POWER
70 degrees	20W	20W	20W	20W	20W	100W
60 degrees	5W	20W	25W	25 W	i 25 W	100W
50 degrees	OW	5W	25W	35W	35W	100W
40 degrees	OW	OW	5W	45W	50W	100W
30 degrees (transitioning)	OW	OW	OW	5W	^: 90W	100W
30 degrees (set)	OW	OW	OW	OW	100W	100W

Example 4 - Beam mixing

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By adjusting the powered delivered to each lens segment that can be improved. For example on a product with two beam angles - 60, 35 and 15 degrees, when using 60 degrees the chips used in the outer lens section can be increased in brightness ensuring even light distribution throughout the beam.

	BEAM ANGLE	60 Degree Chip Group Power	30 Degree Chip Group Power	15 Degree Chip Group Power 5W	TOTAL POWER
60 degrees	15W	low	30W < ..................
10	Th	e point at which the light focuses as a perfect “mix”	can atso be <	tdj usted by

manipulating the power supplied to each segmen

This is useful as a single unit can be installed into any height celling ami a perfect “mix” be achieved at floor level

The invention if further described by means of example but not in any limitative sense with reference to the accompanying drawings, of which

Figure 1 is a cross sectional view of the light unit;

Figure 2 is an exploded view of the light guide member shown in Figure 1;

Figure 3 is an exploded view of the light unit;

Figure 4 is a perspective view of t he light unit; and.

Figure 5 is a cross sectional view of the light unit showing the main and composite beam angles.

The same reference numerals are used to denote like components in each of the figures.

The light unit shown in the Figures comprises a housing (1) having a central axis of symmetry and includes a rear portion (2) and a radially outwardly tending flange (3). The rear portion (2) defines a central aperture (4) with a convoluted outer periphery comprising inwardly extending projections with gaps between the projections. A pair of outwardly extending connecting members (5) extend from the rear portion (2). The housing (1} is arranged to fit into an aperture in a ceiling panel or other fascia, (not shown) with the flange (3) overlying the surface of the fascia to conceal the aperture. The light unit is secured io the fascia by means of two spring clips (6) which are configured to attach to the connecting members (5).

The light unit further comprises a -main LED chip lamp {7; mounted centrally on a support (8) located in the rear of the housing (I). A multiplicity of secondary LED chip lamps (9) are mounted on the support ;8) in a circular array around the main LED chip lamp (7). A heat sink (J 0) having cooling fins I11} is mounted on the rear surface of the support ξ8} and provides cooling for boil- the main (7) and secondare (9) LED chip lamps. .A guide (12) for a power supply cable is provided at the side of the heat sink (10}. An intumescent seal ring (13) is located on the rear portion of the housing (1) so dial die intumescent seal ring (13) lies against the flange (3) of die housing (1). A further annular intumescent seal (14} defining a central aperture (15) with a convoluted outer periphery comprising inwardly extending projections with gaps between tke projections is located between the heat smk (10) .and the rear portion (2) so that the central apertures ;A 15) can at least partially overlap.

The light unit further comprises a front casing (16) having a lamp dividing wail (17) and a radially outwardly extending annular flange (18). The lamp dividing wall (17) defines an axial cylindrical main central aperture (19) within which the main LED chip lamp (7) is axially located and a multiplicity of secondary apertures (20} in a radially outwardly array around the main central aperture (19} within which the secondary LED chip lamps (9) are located. The lamp dividing wall (17) further comprises an array of radially extending projections (21) located between: each of the secondary apertures (20). Each of the projections (21} project upwardly towards the annular .Gauge (18). The lamp dividing wall i 17) is positioned to contact the support (8) so that light from the secondary LED chip lamps (9) and the main LED ehip lamp (7) cannot mix within the housing.

A light guide member (22) is shown in greater detail in Figure 2 and comprises a main lens (23) and a light guide element (24). The main lens (23) is dimensioned to be received within the light guide element (24), The main lens (23) is cone shaped and comprises an annular body extending radially outwardly away from a main iigl.it inlet (25) towards a main light outlet (26). The main light inlet (25) may be located in contact with the main LED cl lip lamp (7) or may be arranged in proximate spaced relation to the main LED chip lamp (7). The mam lens (23) may be made of an acrylic polymeric resin.

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The light guide element (24) has an annular or toroidal body with a radially inner a smooth curve having a maximum radius from a light guide flange (30) having a cylindrical light guide outlet (31). The ntact with the secondary LED chip lamps (9) or spaced relation to the secondary LED chip lamps (9). The f the light guide outlet (31) extends coaxially with the centra! axis of symmetry of die unit. The light guide element (24) may be made of an acrylic polymeric resin.

surface (28) which extends in inlet (29 s towards an annular light guide inlet (29) may be located in co. may be arranged in proximate surface

An outer surface (33) of the light, guide element (24) has a stepped configuration to allow the guide to be accurately located within the housing (1) in contact with the extended flange (3) overlying the fascia surface.

Tire light unit further comprises a divider (34) formed from a single sheet of material in the shape of a cone. The divider (34) is adapted to be located between the main lens (23) and the light guide element (2-4). The divider (34) may have a curvature that corresponds to the curvature of the main lens (23) and the curvature of the inner surface (28) of the light guide element (24). Such an arrangement may prevent movement of the main lens (23) and light guide element (24) relative to one and other. Alternatively, the divider (34) may be arranged to partial contact the main lens (23) and the light guide element (24). The divider (34) may also be arranged so that it does not contact the main lens (23) or the light guide element (24). The divider (34) may be composed or a reflective, opaque or textured material. The surface of the main lens (23) and the light guide element (24) may have a reflective, opaque or textured finish to improve transmission of light through the lens structures.

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The divider (34) is positioned between the main lens (23) and the light guide element (24) to prevent light from escaping from the sides of the main lens (23) and the light guide element (24).

In use power is applied to the main LED chip lamp (7) and light emitted from the main LED chip lamp (7) is directed through the main lens (23) to provide a main beam with a beam angle, in this embodiment 40”. if a provides power to the secondary LED chin user wishes to widen the beam angle the user amps (9) and light emitted from, the secondary

LED chip lamps (9) is directed through the light guide element /24) to provide a peri radially outwardly away from the central symmetry axis, The main beam and the peribeam are arranged to provide a composite beam with a beam angle greater than the beam angle, in this embodiment 60°,

V arioui modifications will be apparent to a person skilled in the art. embodiment the heat sink (10) may include forwardly extending projections (not s' arranged to pass through an array of gaps (not shown) in the rear portion (2) of the flan and into thermal contact with the rear surface of the support (8).

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pheral main

In an

Lown) .ge (3)

Claims

1. A light unit comprising:

a housin'/ having a central symmetry axis:

l.-· V ν' a support located in the housing;

a main lamp located axially on the support:

ng, a front casing defining a central aperture;

a light guide member located in the housing, the light guide member comprising:

a main, lens bavins:

c.· a main liuht inlet nroximate the main lamp: and a main lisht outlet;

the main lens being arranged to allow passage of light through the main lens and out of the central apert ure; and one or more light guide elements located radially outwardly the main lens, each light guide eiement having:

a light guide inlet proximate a secondary lamp array; and a light guide outlet;

each light guide outlet being arranged to allow passage of light through the respective light guide element, and out. of the housing;

the mam lens being arranged to provide a main beam along the central symmetry axis with a main beam angle, the one or more light guide elements being arranged to provide one or more outer peripheral beams radially outwardly of the main beam;

wherein the light unit provides the mam beam and the one or more outer peripheral beams individually or in combination with each other; and wherein the main beam and the one or more outer peripheral beams are arranged to provide a composite beam with a beam angle greater than the main beam angle.

•ί

A light unit as claimed in claim L wherein the one or more peripheral beams are .novided al an acute or obtuse angle relative to the central symmetry axis.

3.

A light unit as claimed in claim 1 or

2, wherein the composite beam angle is between 30° to 70°.

.η

4.

claimed in claim 3, wherein the composite beam angle is between 40° to 60°.

A light unit as claimed in any preceding claim, further comprising one or more dividers located between the main lens and each of the one or more Light guide elements;

wherein the one or more dividers prevents passage of light from the main lens to the one or more light imide elements and from the one or more light guide elements lo tire main <P CP CP tP

6.

A light unit as claimed in claim 5, wherein the dividers are cone shaped shaped.

fl

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A light unit as claimed arranged to extend radially outwardly away from the support towards the front casing

8.

A light unit as claimed in any of claims claim 5 to 7, wherein the one or more

9.

A Light unit as claimed in any of claims 5 to 8, wherein the one or more dividers are composed of a reflective, opaque, frosted or textured material.

A light unit as claimed in any preceding claim, wherein the one or more light guide

Λ fX.4 M elements have an annular body extending radially outwardly away Sum the light guide inlet towards the light guide outlet.

ί

A light unit as claimed in claim 10, the one or more light guide elements further comprising an annular flange extending from the annular body, wherein the light guide outlet

12.

A light unit as claimed, in claim 11, wherein the light, guide outlet is located on a

A light unit as claimed in anv oreceding claim, wherein the main lens has an annular body extending, radially outwardly away from, the main light inlet towards the main light

14.

wherein the main lens, one or more provided as a unitary construct.

5 to 9, wherein the main lens, one or more light guide elements and one or more dividers are provided as separate components.

16.

A light unit as claimed in any of claims 5 to 9, the main lens and the one or more light guide elements are provided as separate components, wherein the main lens or the one more light guide elements are provided as a unitary construct with the one or more dividers.

i

A light unit as claimed in any preceding claim, further comprising a lamp dividing &

wall located in the housing, the lamp dividing wall having an axial array of projections extending away from the support towards the light guide member to prevent the passage of light from the main lamp to the one or more light guide elements and from the secondary lamps to the main lens.

A light unit as claimed in anv preceding claims, wherein the light guide member is i K? · 4.^ 4../ rotationally symmetrical about the central symmetry axis.

19.

A light unit as claimed in any preceding claim, wherein the light guide member is composed of acrylic polymer.

Amendments to the claims have been filed as follows

1. A light unit comprising:

a housin'/ having a central ssmmetry axis:

l.-· V ν' a support located in the housing;

a main lamp located axially on the support:

ng, a iiont casing defining a central aperture;

a light guide member located in the housing, the light guide member comprising:

a main, lens bavins:

a main light inlet nroximate the main lamp: and a main light outlet:

the main lens being arranged to allow passage of light through the main lens and out of the central aperture; and one or more light guide elements located radially outwardly the main lens, each light guide element having:

a light guide inlet proximate a secondary lamp array; and a light guide outlet;

each light guide outlet being arranged to allow passage of light through the respective light guide element and out of the housing;

A light unit as claimed in claim L wherein the one or more peripheral beams are Kovided at an acute or obtuse angle relative to the central symmetry axis.

•i ··· · ·

3. A light unit as claimed in claim 1 or 2, wherein the composite beam angle is between 30° to 70°.

4. A light unit as claimed in claim 3, wherein the composite beam angle is between 40° to

5 60°.

5. A light unit as claimed in any preceding claim, further comprising one or more dividers located between the main lens and each of the one or more light guide elements;

wherein the one or more dividers prevents passage of light from the main lens to the 10 one or more light guide elements and from the one or more light guide elements to the main lens.

·*·**·

6. A light unit as claimed in claim 5, wherein the dividers are cone shaped.

15

7. A light unit as claimed in claim 5 or 6, wherein the one or more dividers are arranged to extend radially outwardly away from the support towards the front casing.

8. A light unit as claimed in any of claims claim 5 to 7, wherein the one or more dividers are arranged to contact the support.

9. A light unit as claimed in any of claims 5 to 8, wherein the one or more dividers are composed of a reflective, opaque, frosted or textured material.

10. A light unit as claimed in any preceding claim, wherein the one or more light guide 25 elements have an annular body extending radially outwardly away from the light guide inlet towards the light guide outlet.

11. A light unit as claimed in claim 10, the one or more light guide elements further comprising an annular flange extending from the annular body, wherein the light guide outlet

30 is located in the annular flange.

12. A light unit as claimed in claim 11, wherein the light guide outlet is located on a periphery of the annular flange.

A light unit as claimed in anv oreceding claim, wherein the main lens has an annular body extending, radially outwardly away from the main light inlet towards the main light

14.

wherein the main lens, one or more provided as a unitary construct.

5 to 9, wherein the main lens, one or more light guide elements ami one or more dividers are provided as separate components.

16.

A light unit as claimed in anv preceding claims, wherein the light guide member is rotationally symmetrical about the central symmetry axis.

19.