GB2287529A

GB2287529A - Lamp fitting

Info

Publication number: GB2287529A
Application number: GB9414950A
Authority: GB
Inventors: Andrew Terry Neal
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-03-15
Filing date: 1994-07-25
Publication date: 1995-09-20
Also published as: GB9405011D0; GB9414950D0

Abstract

A lamp fitting including a collar member which can be fitted in, or over, a neck section of a reflector and to which a lamp can be mounted, said collar member including a fitting for cooperating with the neck section of the reflector so as to allow variation in axial position of the reflector in relation to the collar member. The lamp fitting may include a reflector. <IMAGE>

Description

LAMP FITTING The present invention relates to a fitting for locating a lamp in at least two positions in a lamp reflector.

In many applications, lamp reflector arrangements producing different beam angles and/or intensities are required to provide desired effects. However, in conventional lamp reflector arrangements, used for example in stage lighting, it is not possible to vary the beam angle and intensity as the fitting which houses the lamp is fixedly mounted to the reflector body. Thus, if a different beam angle and/or intensity is required the lamp reflector arrangement has to be replaced.

The present invention aims to provide a fitting for a lamp reflector which allows a lamp to be located repeatedly and accurately in at least two positions in a reflector and thus provide an output beam having at least two different beam angles and/or intensities.

Accordingly, the present invention provides a fitting for a lamp and reflector, which fitting comprises a collar member which can be fitted in, or over, a neck of a lamp reflector and to which a lamp can be mounted, said collar member including axially adjustable attachment means for cooperating with means on the neck of the reflector to allow variation in axial position of the reflector in relation to the collar member.

Preferably, said axially adjustable attachment means forms part of a slot and follower arrangement in which the follower rides in the slot, so that the relative position of the collar member and the neck of the reflector, which determines the position of the lamp in the reflector, is governed by the position of the follower in the slot.

Preferably, said collar member includes a lamp holder secured in a position axially relative to said collar member.

The invention includes a collar member aforesaid together with a reflector mounted to said collar member.

Embodiments of the present invention will now be described hereinbelow by way of example only with reference to the accompanying drawings, in which: Figure 1 is a side elevational view of a lamp fitting mounted on a lamp reflector (shown in cross section) in accordance with a first embodiment of the present invention; Figure 2 is a plan sectional view taken along line A-A illustrated in Figure 1; Figure 3 is a cross-sectional view of a parabolic lamp reflector; Figure 4 is a side elevational view of an alternative collar member for use with the lamp fitting illustrated in Figure 1; Figure 5 is a side elevational view of another alternative collar member for use with the lamp fitting illustrated in Figure 1; Figure 6 is a side elevational view of a further alternative collar member for use with the lamp fitting illustrated in Figure 1; Figure 7 is a plan elevational view of a still further alternative collar member for use with the lamp fitting illustrated in Figure 1; Figure 8 is a cross-sectional view along line B-B of the collar member illustrated in Figure 7; Figure 9 is a cross-sectional view along line C-C of the collar member illustrated in Figure 7; Figure 10 is a part plan elevational view of a lamp reflector adapted to receive the collar member illustrated in Figures 7 to 9; Figure 11 is a first side elevational view of the neck section of the lamp reflector illustrated in Figure 10 (viewed along line D-D); Figure 12 is a second side elevational view of the neck section of the lamp reflector illustrated in Figure 10 (viewed along line E-E); Figure 13 is a plan elevational view of a spacer employed in conjunction with the collar member illustrated in Figures 7 to 9; Figure 14 is a cross-sectional view along line F-F in Figure 13; Figure 15 is a side elevational view of a lamp fitting mounted on a lamp reflector (part cut away) in accordance with a second embodiment of the present invention; Figure 16 is an exploded view of the lamp fitting illustrated in Figure 15; Figure 17 is a side elevational view of the assembly frame illustrated in Figures 15 and 16; Figure 18 is an elevational view of the assembly frame illustrated in Figures 15 and 16 viewed from below; Figure 19 is a plan elevational view of the collar member illustrated in Figures 15 and 16; Figure 20 is a first side elevational view of the collar member illustrated in Figure 19 (viewed along line G-G); and Figure 21 is a second side elevational view of the collar member illustrated in Figure 19 (viewed along line H-H).

Figures 1 and 2 illustrate a lamp fitting mounted on a lamp reflector 3 in accordance with a first embodiment of the present invention. A collar member 1 is mounted over a rear neck section 2 of the lamp reflector 3. The collar member 1 alternatively, however, could be adapted to fit within the neck 2 of the lamp reflector 3.

The collar member 1 is preferably an interference fit with the neck section 2 of the lamp reflector 3 in order to more securely maintain the collar member 1 in position on the neck section 2 of the lamp reflector 3. A lamp holder 5, in which a lamp 6 is removably located, is mounted to the collar member 1. The position of the lamp 6 is thus fixed in relation to the collar member 1 and hence it is the axial position of the collar member 1 in relation to the neck 2 of the reflector 3 which determines the position of the lamp 6 in the reflector 3.

The lamp holder 5 is a known commercially available unit. Lamp holders are selected according to the type and size of lamp used, and the application of the lamp reflector. The lamp 6 is selected according to the size of the reflector 3. The lamp glass can be frosted, typically by very lightly sandblasting the surface of the lamp glass, to reduce filament reflections ("hot spots") in the output beam.

The lamp reflector 3 is a parabolic reflector, typically a standard PAR (Parabolic Aluminised Reflector) parabolic lamp reflector as used, for example, in stage lighting. Such lamp reflectors are currently available in four sizes, these being PAR 36, 46, 56 and 64. The numerals 36, 46, 56 and 64 represent the outer diameter at the open end of the parabolic reflector as a multiple of one-eighth of an inch. The outer diameter of a parabolic reflector is shown as distance X in Figure 3. By way of example, the overall diameter of a PAR 64 reflector is 8" (20.32cm), that is, 64 x 1/8" (0.3175cm) = 8" (20.32cm).

The lamp reflector 3 can optionally include ventilation holes or cut-outs in the lower part 8 of the rear neck section 2 to allow for air circulation and cooling of the lamp 6. If additional ventilation is required, or in lamp reflectors in which the collar member surrounds the entire neck section (i.e. those lamp reflectors which have no exposed lower part in the rear neck section), holes or cut-outs can be formed in the neck section of the lamp reflector with corresponding holes or cut-outs formed in the collar member. The inner reflecting surface 7 of the parabolic reflector 3 can be dimpled or faceted to remove filament reflections ("hot spots") and can further include optical coatings to reduce infra-red emmissions. The dimpling or faceting of the inner reflecting surface 7 can be employed alone, or in combination with the frosting of the lamp glass as discussed hereinabove.

Suitable types of lamp for use in the known sizes of PAR lamp reflectors are indicated in Table 1.

Table 1 PAR36 6 volt 35 watt "Halostar" (trade name) lamps, typically an Mull6 lamp supplied by Osram and GE, or a 13094 lamp supplied by Phillips; DYG1 30 volt 250 watt DYG lamps; and 2 120, 220, 240 volt 650 watt A1/247 lamps.

PAR 46 The above-mentioned lamps suitable for the PAR36 reflector; and 500 watt 120/240 volt "Maxlight" lamps as available from DLD Productions Limited.

PAR56 The above-mentioned lamps suitable for the PAR36 and 46 reflectors; but not including the 6 volt 35 watt "Halostar" lamps.

PAR64 DYG1 30 volt 250 watt DYG1 lamps; and 500 and 1000 watt "Maxlight" lamps as available from DLD Productions Limited.

1 DYG is an ANSI lamp standard 2 Al/247 is an LIF Standard lamp number Lamp reflectors usually comprise a normal grade aluminium body clad with a super-pure (i.e. typically 99.99% purity) aluminium layer on the inner reflecting surface. The thickness of such clad aluminium layers is usually about 15% of the overall thickness of the body of the lamp reflectors. This clad aluminium is known in the trade as "ALCLAD".

The main body of the reflector is usually made of normal grade aluminium to reduce cost since only the inner surface of the lamp reflector is required to have a high reflectivity. Lamp reflectors are fabricated by first mechanically spinning a blank into shape, then polishing, electrobrightening and sealing the inner reflecting surface. The blanks are typically about 0.05" (0.127cm) in thickness. The process of electrobrightening or electrolytic polishing is employed to remove microscopic irregularities in the reflector surface. During the process of electrobrightening the back surface of the lamp reflector hardens, increasing the rigidity of the reflector. Where a very bright finish is not required the inner reflecting surface can be bright dipped or plated and anodized.

The collar member 1 includes in its tubular wall three similarly shaped slots 9 angularly spaced 1200 apart. The slots 9 defined in the collar member 1, which when mounted on the neck section 2 of the lamp reflector 3, cooperate and engage with respective projections 10 provided on the rear neck section 2 of the lamp reflector 3. It will be understood that the present invention is not limited to such an arrangement of slots 9 and projections 10. Any number of slots and projections arranged with any angular spacing alternatively can be employed (e.g. two projections and corresponding slots located on opposed sides along the diameter of the collar member and neck section of the reflector). It will also be noted that alternatively the slots can be defined in the neck section 2 of the reflector 3 and the cooperating projections provided on the collar member 1. The shaped slots 9 define first and second slot portions 11,12 which when the respective projections 10 are located therein fix the lamp 6 and hence lamp filaments 13 (light source) at first and second predetermined positions relative to the focal point F of the lamp reflector 3. It is by moving the lamp filaments 13 about the focal point F of the reflector 3 that the output beam angle and/or intensity is varied.

Figure 3 illustrates a parabolic lamp reflector 3. The focal point F of the lamp reflector 3 is located a distance L from the origin 0 of the parabolic curve of the lamp reflector 3. The focal point F of lamp reflectors varies with application, but typically for a PAR64 narrow beam reflector the focal point F is about 40mm from the origin 0.

With the projections 10 in the first and second slot portions 11,12 the collar member 1 is located in first (forward) and second (rear) fixed positions in relation to the lamp reflector 3. The lamp 6 which is mounted to the collar member 1 can thus be located accurately at two predetermined positions within the lamp reflector 3. The engagement of the projections 10 in the slot portions 11,12 ensures the lamp 6 and hence the lamp elements 13 can be located repeatedly at the same first and second positions in the lamp reflector 3. The output beam can thus be selected from one of a first and second beam angle/intensity which corresponds to the location of the projections 10 in the first or second slot portions 11,12. It will be understood that the present invention is not limited to only first and second slot portions 11,12, but that a plurality of such slot portions for locating a lamp at a plurality of fixed positions within the reflector 3 can be employed. In this embodiment the slots 9 include a portion 14 which extends to an edge of the collar member 1 so as to allow the collar member 1 to be separated from the reflector 3. This allows the lamp 6 to be changed easily. In collar members in which a portion of the slots extends to an edge, removal of the collar member from the reflector can be prevented by locating a 'jubilee' clip about the lower end of the collar member 1 below the projections 10. Alternatively, where removal of the collar member 1 is not required the slots 9 defined in the collar member 1 can be arranged so as not to include a portion 14 which extends to an edge of the collar member 1. The projections 10 on the neck 2 of the reflector 3 thus will be captively held in the respective slots 9 defined in the collar member 1.

In use, the collar member 1 is located on a reflector 3 as illustrated in Figures 1 and 2. When projections 10 are located in the first slot portions 11 (forward position) the lamp 6 is located further from the origin 0 of the parobolic curve of the reflector 3 than when the projections 10 are located in the second slot portions 12 (rear positions). In order to locate the projections 10 in the first slot portions 11, the collar member 1 is pushed fully onto the neck section 2 of the reflector 3 and rotated in a clockwise direction in relation to the reflector 3. In order to to locate the projections 10 in the second slot portions 12, the collar member 1 is pushed partly onto the neck section 2 of the reflector 3 and rotated in an anti-clockwise direction in relation to the reflector 3.

Typical variations in beam angle and beam intensity which can be achieved using a PAR64 reflector are illustrated in Tables 2 and 3 hereinbelow. In the forward lamp position which corresponds to the location of projections 10 in the first slot portions 11 the light source (lamp filaments 13) is located about 3.5mm beyond the focal point F from the origin 0 along the optical axis, and in the rear lamp position which corresponds to the location of projections 10 in the second slot portions 12 the light source is located about 3.5mm closer to the origin 0 than the focal point F. The total displacement between the forward and rear positions is about 7mm and is represented by Y in the Figures. The forward and rear positions are shown as reference signs F" and F', respectively, in Figure 3.

Table 2 - PAR64 Reflector with 1000W frosted Lamp Lamp Forward Position Center intensity 4000 foot-candle (43055.6 lux) 50% Diameter 16 inches (40.64cm) Beam Angle 9 degrees 10% Diameter 38 inches (96.52cm) Field Angle 18 degrees Lamp Rear Position Center intensity 2000 foot-candle (21527.8 lux) 50% Diameter 24 inches (60.96cm) Beam Angle 12 degrees 10% Diameter 48 inches (121.92cm) Field Angle 24 degrees Table 3 - PAR64 Reflector with 500W Lamp Lamp Forward Position Center intensity 4000 foot-candle (43055.6 lux) 50% Diameter 12 inches (30.48cm) Beam Angle 6 degrees 10% Diameter 18 inches (45.72cm) Field Angle 12 degrees The center intensity is that illuminance at a distance of lOft (304.8cm) along the optical axis from the origin 0.

The 50% intensity is that diameter about the optical axis at lOft (304.8cm) from the origin 0 where the illuminance has fallen to half that value of the center intensity (i.e. 2000 foot-candle (28527.8 lux) and 1000 foot-candle (10763.9 lux) for center intensities of 4000 foot-candle (43055.6 lux) and 2000 foot-candle (21527.8 lux), respectively).

The 10% intensity is that diameter about the optical axis at lOft (304.8cm) from the origin where the illuminance has fallen to one tenth of that value of the center intensity (i.e. 400 foot-candle (4305.56 lux) and 200 foot-candle (2152.78 lux) for center intensities of 4000 foot-candle (43055.6 lux) and 2000 foot-candle (21527.8 lux), respectively).

Figures 4 to 9 illustrate collar members 1 for use with the fitting in accordance with the first embodiment of the present invention. In each of the collar members 1, the slots 9 include only first and second slot portions 11,12. However, it will be understood that further slot portions can be included if required.

A first alternative collar member 1 is illustrated in Figure 4. The collar member 1 is located in a first position by pushing the collar member 1 onto the neck section 2 of the reflector 3 and rotating the collar member 1 in a clockwise direction in relation to the reflector 3 to engage a projection 10 in a first slot portion 11. The collar member 1 is located in a second position by pushing the collar member 1 onto the neck section 2 of the reflector 3 and rotating the collar member 1 in an anti-clockwise direction in relation to the reflector 3 to engage a projection 10 in a second slot portion 12. By locating the projections 10 in either of the first or second slot portions 11,12 respective predetermined first and second positions of a lamp (mounted to the collar member 1) in the reflector 3 are achieved.

A second alternative collar member 1 is illustrated in Figure 5. The collar member 1 is located in a second (rear) position by pushing the collar member 1 onto the neck section 2 of the reflector 3 and rotating the collar member 1 in an anti-clockwise direction in relation to the reflector 3 to engage a projection 10 in a second slot portion 12. The collar member 1 is located in a first (forward) position by pushing the collar member 1 further onto the reflector 3 and rotating the collar member 1 in an anti-clockwise direction in relation to the reflector 3 to engage a projection 10 in a first slot portion 11. The first and second slot portions 11,12 in this case both extend in a direction transverse to the axis of the reflector 3 and are offset from each other along the axis.

A third alternative cellar member 1 is illustrated in Figure 6. The collar member 1 is located in a first position by pushing the collar member 1 fully onto the neck section 2 of the reflector 3, rotating the collar member 1 in an anti-clockwise direction in relation to the reflector 3 and pushing the collar member 1 further onto the neck section 2 of the reflector 3 to engage a projection 10 in a first slot portion 11. The collar member 1 is located in a second position by pushing the collar member 1 onto the neck section 2 of the reflector 3, rotating the collar member 1 in a clockwise direction in relation to the reflector 3 and pulling the collar member 1 away from the neck section 2 of the reflector 3 to engage a projection 10 in a second slot portion 12.

A fourth alternative collar member 1 is illustrated in Figures 7 to 9. The collar member 1 has a partially closed end which is adapted to fit over the rear neck section 2 of a lamp reflector 3. A lamp reflector 3 which is adapted to receive the collar member 1 is illustrated in Figures 10 to 12. The collar member 1 is fabricated from sheet material (typically 18 guage, O.llcm) and is finished with a black anodize. The inner surface of the collar member 1 is preferably coated, e.g.

by spraying, with TEFLON (a Registered Trade Mark). The TEFLON coating allows the collar member 1 to be moved more readily about the neck of a reflector 3, particularly when hot from use. The partially closed end of the collar member 1 includes a first cut-out 15 in which a lamp holder is located. A lamp holder is mounted to the collar member 1 by screws located through holes 16 defined in the partially closed end of the collar member 1. The collar member 1 has two slots 9 defined on opposed sides along the diameter of the tubular wall thereof. The slots 9 cooperate with projections 10 located on the neck section 2 of the reflector 3. The slots 9 do not extend to an edge of the collar member 1 and thus when the collar member 1 is located on the neck 2 of the reflector 3 the projections 10 are captively held within the slots 9 preventing removal of the collar member 1 from the reflector 3. The width of the slots 9 is selected to suit the dimensions of the projections 10. Typically, the width of the slots 9 and the diameter of the projections 10 is about 0.25" (0.635cm). The projections 10 typically comprise a threaded guide pin or stud which is screwed into a pilot hole formed in the neck section 2 of the lamp reflector 3. The slots 9 include first and second slot portions 11,12 which, when the respective projections 10 on the reflector 3 are located therein, define first and second axial positions of the collar member 1 in relation to the lamp reflector 3. The displacement Y between the first and second positions (forward and rear positions) is typically 0.1875" (0.476cm) for 500W lamps and 0.25" (0.635cm) for 1000W lamps. A lamp mounted to the collar member 1 is located in a first (forward) position by pushing the collar member 1 towards the body of the relfector 3, that is by locating the projections 10 in slot portions 11. A lamp mounted to the collar member 1 is located in a second rear (position) by pulling the collar member 1 away from the body of the reflector 3, that is, by locating the projections 10 in the slot portions 12.

Referring to Figure 8, the tubular wall of the collar member 1 also includes two cut-outs 17. These cut-outs 17 are broadly co-extensive with cut-outs 18 defined in the neck section 2 of the lamp reflector 3 and provide an opening to the interior of the neck section 2 of the lamp reflector 3 which allows for air circulation and cooling. The cut-outs 18 defined in the neck section 2 of the reflector 3 can be larger in size than those defined in the tubular wall of the collar member 1.

Preferably, the corners of the cut-outs 17,18 defined in the collar member 1 and the neck section 2 of the reflector 3 are rounded.

In order to ensure that the collar member 1 is located, in use, in one of the first and second positions, shaped spacers 19 are located between the outer surface of the neck section 2 of the reflector 3 and the inner surface of the collar member 1. Each spacer 19 has a hole 20 defined therein and is located over a respective projection 10 on the neck section 2 of the reflector 3.

The spacers 19 are fabricated from shim steel having a thickness of 0.01-0.015" (0.0254-0.0381cm) and are shaped to have a curve in at least one direction of typically 1.25 RAD. Preferably, the edges of the spacers 19 are de-burred and the outer convex surfaces are coated with TEFLON.

A fitting in accordance with a further embodiment of the present invention is illustrated in Figure 15. In this embodiment a U-shaped assembly frame 21 is mounted to the neck section 2 of the lamp reflector 3. The extending arms 22 of the U-shaped assembly frame 21 are fixed by screws 23 to the projections 10 on the neck section 2 of the lamp reflector 3. The assembly frame 21 is coupled to the neck section 2 of the lamp reflector 3 in such a manner as to define a channel between the extending arms 22 thereof and the neck section 2. Figures 17 and 18 respectively illustrate elevational views of the assembly frame 21 from one side and from below. The extending arms 22 include projections 24 at their distal ends.

These projections 24, in use, rest against the rear surface of the lamp reflector 3 and are provided to locate the assembly frame 21 accurately in relation to the neck section 2 of the lamp reflector 3.

A collar member 1, to which a lamp holder 5 is fixed, is axially slidably mounted over the neck section 2 of the lamp reflector 3 in that channel defined between the neck section 2 and the assembly frame 21. The axial position of the collar member 1 in relation to the lamp reflector 3 is controlled by an adjustment means 25. The adjustment means 25 comprises an adjuster plate 26, an adjuster 27 and a knob 28. The adjuster plate 26 is fixed to the partially closed end of the collar member 1 and includes a threaded extending part 28 which cooperates and engages with a corresponding threaded part of the adjuster 27. The adjuster 27 extends through an opening 30 formed in an end 31 of the assembly frame 21. The opening 30 has a bush 32, preferably of TEFLON, located therein.

Movement of the collar member 1 in the axial direction of the neck section 2 of the lamp reflector 3 is achieved by rotating the knob 28 in a clockwise/anticlockwise direction. The adjuster 27 may include a locking device, e.g. a locking nut, which engages with the end 31 of the assembly frame 21 so as to fix the axial position of the collar member 1. The use of a locking device prevents movement of the collar member 1 on the neck section 2 of the reflector 3 during transport. The collar member 1 is illustrated in Figures 19 to 21. The collar member 1 has an elongate opening 15 defined in its partially closed end in which the lamp holder 5 is located. The axial position of the collar member 1 to which the lamp holder 5 is mounted determines the angle and intensity of the output beam. The lamp holder 5 and adjuster plate 25 are mounted to the collar member 1 by machine screws 33. In this respect, this collar member 1 is of broadly similar construction to that collar member 1 illustrated in Figures 7 to 9. The collar member 1 has two slot portions 9 defined in the tubular wall portion thereof. The slot portions 9 are defined in opposed sides along the diameter of the tubular wall of the collar member 1. In the assembled configuration, the slot portions 9 are located over the projections 10 on the neck section 2 of the lamp reflector 3. The slot portions 9 in the illustrated collar member 1 extend to a free end of the tubular wall, allowing the collar member 1 to be removed from the neck section 2 of the lamp reflector 3. However, it will be understood that a collar member 1 such as illustrated in Figures 7 to 9 which has captive slot portions 9 defined therein could also be employed. The tubular wall portion of the collar member 1 has two further cut-outs 17 defined therein. Those cut-outs 17 correspond with cut-outs 18 defined in the neck section 2 of the lamp reflector 3 and provide an open passage for air-circulation.

In this embodiment, a lamp can be located accurately in any position along the optical axis of the reflector within the limits of the axial movement of the collar member 1. The limits of movement of the collar member 1 are either determined by the configuration of the adjustment means 25, or by the axial dimensions of the slot portions 9 defined in the tubular wall of the collar member 1.

It will be understood by a person skilled in the art that various modifications and adaptations can be made to the embodiments described hereinabove without departing from the scope of the present invention as defined in the claims.

Claims

CLAIMS:

1. A lamp fitting including a collar member which can be fitted in, or over, a neck section of a reflector and to which a lamp can be mounted, said collar member including a fitting for cooperating with the neck section of the reflector so as to allow variation in axial position of the reflector in relation to the collar member.

2. A lamp fitting as defined in claim 1, further including a reflector having a neck section which is fitted coaxially to the collar member.

3. A lamp fitting as defined in claim 2, wherein said fitting forms part of a slot and follower assembly in which at least one follower rides in a respective slot, so that the relative position of the collar member and the neck section of the reflector is governed by the position of the at least one follower in the at least one slot.

4. A lamp fitting as defined in claim 3, wherein the at least one slot is defined in a sidewall of the collar member.

5. A lamp fitting as defined in claim 4, wherein the at least one slot is an open ended slot which extends to an edge of the sidewall.

6. A lamp fitting as defined in claim 4, wherein the at least one slot is a closed slot defined within the sidewall.

7. A lamp fitting as defined in any one of claims 2 to 6, wherein said collar member is located over the neck section of the reflector.

8. A lamp fitting as defined in claim 7, wherein each follower is a projection on an outer circumferential surface of the neck section of the reflector.

9. A lamp fitting as defined in any one of claims 2 to 8, further including a frame assembly having extending arms which are mounted in spaced relation about the neck section and collar member.

10. A lamp fitting as defined in claim 9, wherein said frame assembly is U-shaped.

11. A lamp fitting as defined in claim 9 or claim 10 when appendant upon claim 8, wherein the extending arms of the frame assembly are fixed to projections on the neck section of the reflector.

12. A lamp fitting as defined in any one of claims 9 to 11, wherein said collar member is in axial slidable fit in a space defined between an outer circumferential surface of the neck section of the reflector and an inner circumferential surface of the extending arms of the frame assembly.

13. A lamp fitting as defined in any one of claims 9 to 12, further including an adjustment means, said adjustment means including. a threaded adjuster which is coupled to the web of the frame assembly and to the collar member, whereby rotation of the threaded adjuster effects axial movement of the collar member in relation to the neck section of the reflector and the frame assembly.

14. A lamp fitting as defined in claim 13, wherein said threaded adjuster comprises a threaded bolt part which is fixed to the collar member and a threaded nut part which is rotatably mounted to the web of the frame assembly, whereby rotation of the threaded adjuster effects axial movement of the collar member in relation to the reflector and the frame assembly.

15. A lamp fitting as defined in any one of claims 9 to 14, wherein the distal end of each of the arms of the frame assembly has two extensions extending therefrom which are adapted to engage on the rear surface of the reflector.

16. A lamp fitting as defined in claim 15, wherein each of said extensions are located at the longitudinal edges of said arms.

17. A lamp fitting as defined in any one of claims 2 to 16, wherein each slot includes first and second slot portions, which when the respective follower is selectively located therein, fix the collar member in a selected one of first and second axial positions relative to the neck section of the reflector.

18. A lamp fitting as defined in claim 17 when appendant upon claim 4, wherein the first and second slot portions are defined in positions spaced about a circumference of the sidewall.

19. A lamp fitting as defined in any one of claims 2 to 18, further comprising spacers which are located between an outer circumferential surface of the neck section of the reflector and an inner circumferential surface of the collar member.

20. A lamp fitting as defined in claim 19, wherein said spacers each have a hole defined therein through which a respective one of the at least one follower is located, and are shaped to have a curve in at least one direction.

21. A lamp fitting as defined in any one of claims 1 to 20, wherein the collar member includes a transverse end wall to which a lamp can be mounted.

22. A lamp fitting as defined in claim 21, wherein said transverse end wall has an opening defined therein in which a lamp can be located.

23. A lamp fitting as defined in any one of claims 1 to 22, wherein said collar member has at least one ventilation cut-out defined therein.

24. A lamp fitting as defined in any one of claims 2 to 23, wherein said reflector is a parabolic reflector.

25. A lamp fitting as defined in any one of claims 1 to 24 in combination with a lamp.

26. A lamp fitting as defined in claim 25, wherein said lamp comprises a bulb and bulb holder.

27. A lamp fitting, comprising: a frame assembly having extending arms; a reflector which includes a neck section having projections on opposed sides thereof, the neck section being located between the extending arms and fixedly mounted to the extending arms by said projections; a collar member which is located between the extending arms of the frame assembly and the neck section of the reflector, the collar member having slots defined in opposed sides thereof in which respective projections are movably located, thereby allowing axial displacement of the collar member in relation to the reflector and frame assembly; and a lamp holder which is mounted to the collar member.

28. A lamp fitting as defined in claim 27, further comprising an adjustment means, said adjustment means comprising a threaded adjuster which is coupled to the web of the frame assembly and to the collar member, whereby rotation of the threaded adjuster effects axial movement of the collar member in relation to the reflector and the frame assembly.

29. A lamp fitting as defined in claim 28, wherein the threaded adjuster comprises a threaded bolt part which is fixedly mounted to the collar member and a threaded nut part which is rotatably coupled to the web of the frame assembly, whereby rotation of the threaded nut part effects axial movement of the collar member in relation to the neck section of the reflector and the frame assembly and thereby provides a means for positioning a lamp mounted in the lamp holder along the optical axis of the reflector.

30. A fitting as defined in claim 29, wherein the threaded nut part has a knob fixed thereto.

31. A lamp fitting substantially as hereinbefore described with reference to any of Figures 1 to 14 or Figures 15 to 21 of the accompanying drawings, optionally in combination with a reflector or a lamp.