Abstract:
Disclosed are a contour light projector including an optical bench for mounting optical components, a mounting assembly that includes a dual pivot system for increased versatility in directing a light projector mounted thereon, improved masking devices for the light projector, and lighting system housings for a variety of installations.

Description:
TECHNICAL FIELD 
     The present invention relates to light projectors that produce light beams for specialty lighting effects. More particularly, the present invention pertains to light projectors that can produce light beams of selected cross-sectional contours, or profiles, and apparatus for mounting and installing such projectors. 
     BACKGROUND OF THE INVENTION 
     Specialty light projectors are known for use in illuminating objects and scenes. Such light projectors may be used in lighting landscape features, architectural features, items displayed in cabinets or the like, art works, including pictures and sculpture, and scenes on a theatrical stage. Various techniques may be employed to affect a projected light beam, selectively blocking, or masking, a portion of the beam. 
     A mask, or masking device, is placed in the path of the light beam as a field stop, between condensing lenses and objective lenses, to define the cross-sectional profile of the light beam. A circular aperture may be used to define a circular profile for a projected light beam, but structured profiles may be achieved with more elaborate field stops, or masking devices, to produce desired specialty lighting effects. For example, a four-blade shutter is known for providing varied shapes defined by the straight edges of the blades. Such a shutter blade system typically has a handle, or tab, protruding from the outer edge of each blade so that the blades may be adjusted individually. However, when the only access to the light projector is from above, the tab of the bottom shutter blade may be inaccessible, and therefore adjustment of the light beam profile in that regard may be impractical, if not impossible. Also, one or more holes of any desired shape may be cut in a slide, or plate, which then serves as a masking device. 
     Additionally, a masking device may be made by using the light projector as a camera, with photosensitive material located where a masking device would be placed. With the light projector in its intended position relative to the target to be illuminated, the photosensitive material is exposed to light reflected from the target into the light projector. A negative photograph of the object to be illuminated by the projector, the target, is thus taken. U.S. Pat. No. 4,217,047 discloses apparatus for obtaining such a photograph. A photographic cassette or a self-developing film pack may be used. A photographic shutter may be added to the projector to control the entrance of light into the projector from the target. The photographic image of the target thus obtained is superimposed on a metal sheet and a hole is then cut in the sheet along the outline of the target image in the photograph. The metal sheet is then used as a mask, having an aperture that conforms in contour to the contour of the photographic image of the target. Alternatively, a metal sheet mask blank is painted and then coated with a photosensitive emulsion layer. The coated mask blank is used as film, which is then developed to obtain a photographic image of the target. An aperture stop may be used to control the amount of light that enters the projector from the target to expose the photosensitive emulsion. The metal sheet is then cut with a knife along the contour of the photographic image of the target to produce a masking device with an aperture that has the same contour as the target. 
     Contour light projectors may be installed in a variety of ways, depending on the environment and the manner of use. For example, a light projector may be held on a bracket or the like, with the bracket fixed to a wall or other structure. A light projector may be installed above a ceiling to project a light beam down toward the floor, or at an angle toward an object or toward a portion of a wall. Generally, an above-the-ceiling installation involves locating the light projector within a housing that is placed above the level of the ceiling. Access from above the ceiling may or may not be available to install the housing and light projector, or to service the light projector after installation is completed. Further, the light projector must still be mounted within the housing, and the manner of so mounting the light projector will determine the limits of one&#39;s ability to direct the projected light beam, and to service the light projector in general. 
     It is advantageous and desirable to provide improved specialty lighting systems with mounting assemblies that include greater flexibility in mounting and directing light projectors, housings that are more adaptable to installation circumstances, masking devices that are easier to use and more effective, and light projectors with improved construction. The present invention provides contour lighting systems with a versatile mounting assembly, convenient and practical housings, improved masking devices, and improved light projector construction. 
     SUMMARY OF THE INVENTION 
     The present invention provides a lighting system including a contour light projector, masking devices for the light projector, a mounting assembly, and system housings for installation in various architectural settings. The mounting assembly includes a frame having an annular flange, and may also include a saddle having a cross member and a seat on which the light projector is selectively mounted, and a dual pivot system provided by the frame and the saddle whereby two pivot axes may be established such that the saddle may pivot about either axis relative to the frame to so orient the light projector. A light projector according to the present invention provides an optical bench within a housing assembly of the light projector on which one or more clamps are positioned to hold optical devices such as a lamp and a condensing lens of the projector. An improved shutter blade mask includes concave edges on the blades to define the contour of the light beam produced by the light projector, and a shutter blade that has two tabs, extending laterally from the blade rather than a single tab extending from the outer edge of the blade. Another mask comprises a glass plate having affixed thereto a photosensitized tape that is exposed to light and developed, and in which an opening is made to determine the contour of the light beam in the light projector. Lighting system housings include an enclosure that is closed on the bottom by a plate featuring a light projection hole, and spring hangers by which the plate is suspended. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an isometric view of a light unit, including a contour light projector and a mounting assembly, according to the present invention; 
     FIG. 2 is an isometric view of the light projector of FIG. 1; 
     FIG. 3 is an exploded isometric view of the light projector of FIGS. 1 and 2; 
     FIG. 4 is an isometric view, partially cut away, of the light projector of FIGS. 1-3; 
     FIG. 5 is another isometric view, partially cut away, of the light projector of FIGS. 1-4; 
     FIG. 6 is a side elevation in partial cross section, and partly schematic, of the light projector of FIGS. 1-5; 
     FIG. 7 is an isometric view of a light diffuser filter used in the light projector of FIGS. 1-6; 
     FIG. 8 is an exploded isometric view of a four-blade shutter mask for use in the light projector of FIGS. 1-6; 
     FIG. 9 is an isometric view of an array of the shutter blades of FIG. 8 as they may be arranged in a light projector according to the present invention; 
     FIG. 10 is an isometric view of a holding ring for securing the shutter blades of FIGS. 8 and 9 in place in a light projector; 
     FIG. 11 is a schematic side view of a portion of a light projector, showing how the holding ring of FIG. 10 is used to secure the shutter blades of FIGS. 8 and 9 in a light projector; 
     FIG. 12 is a front end elevation of a light projector according to the present invention, employing a shutter blade mask as shown in FIGS. 8 and 9; 
     FIG. 13 is an isometric view of the light projector equipped with a shutter blade mask, as shown in FIG. 12; 
     FIG. 14 is an isometric view of a custom plate mask for use in a light projector according to the present invention; 
     FIG. 15 is an isometric view of a holding ring for use with the custom plate mask of FIG. 14; 
     FIG. 16 is an isometric view, partially cut away, of a glass plate photo mask for use in a light projector according to the present invention; 
     FIG. 17 is an isometric view of a holding ring for use with the glass plate photo mask of FIG. 16; 
     FIG. 18 is an exploded isometric view of a portion of a light system according to the present invention, showing a mounting assembly and a portion of a housing; 
     FIG. 19 is an isometric view of a mounting assembly for a light unit according to the present invention; 
     FIG. 20 is another isometric view of the mounting assembly of FIG. 19, in another configuration; 
     FIG. 21 is an isometric view similar to the view of FIG. 19, but showing a light projector joined to the mounting assembly; 
     FIG. 22 is an isometric view similar to the view of FIG. 20, but showing a light projector joined to the mounting assembly; 
     FIG. 23 is an exploded isometric view of a portion of a lighting system for installation in new construction according to the present invention; 
     FIG. 24 is an exploded isometric view of the lighting system of FIG. 23, showing a light projector joined to the mounting assembly; 
     FIG. 25 is an isometric view of a light unit as shown in FIGS. 23 and 24, showing a cover plate attached to the mounting assembly; 
     FIG. 26 is a fragmentary isometric view of a detail of a cover plate as shown in FIG. 25, with an alternative hood; 
     FIG. 27 is an isometric view of another version of a cover plate; 
     FIG. 28 is an exploded isometric view of a portion of a lighting system for installation in new construction, or in remodeling existing construction, according to the present invention, wherein the bottom of the system may be floated with the ceiling; 
     FIG. 29 is an exploded isometric view of the lighting system of FIG. 28, showing a light projector joined to the mounting assembly; 
     FIG. 30 is an exploded isometric view of a lighting system, shown partly in FIG. 18, for installation through a completed ceiling according to the present invention; 
     FIG. 31 is another exploded isometric view of the lighting system of FIGS. 18 and 30, showing the anchoring of the lighting system to the ceiling; 
     FIG. 32 is an enlarged, exploded view of a retaining clip and associated parts for use in anchoring the lighting system of FIGS. 18,  30  and  31  to a ceiling; 
     FIG. 33 is a fragmentary side elevation, in partial section, of a detail of the installed lighting system of FIGS. 18,  30  and  31 , showing use of the retaining clip of FIG. 32; 
     FIG. 34 is an exploded isometric view of a custom lighting system for installation in new or existing construction according to the present invention; 
     FIG. 35 is an isometric view of the exterior of the lighting system of FIG. 34; and 
     FIG. 36 is a fragmentary side elevation, in partial section, of the installed lighting system of FIGS. 18,  30  and  31 . 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     A lighting system according to the present invention is illustrated and described in several presently preferred embodiments. A light unit according to the present invention is shown generally at  10  in FIG. 1, and includes a contour light projector  12  and a mounting assembly  14 . The mounting assembly  14  is installed in various configurations as discussed below, and enables the light projector  12  to be positioned in a wide range of orientations, also as discussed below. 
     Details of the light projector  12  may be appreciated by reference to FIGS. 2-7. The light projector  12  features a housing assembly that includes an end cap  16 , a main housing body  18 , a reducing body  20  and a focal lens sleeve  22 . The narrow end of the generally conical reducing body  20  has two extensions  20   a  that fit around the outside of the end of the sleeve  22 . The sleeve  22  is then held to the reducing body  20  by a clamp  24  that is tightened down on the extensions  20   a  and on the sleeve, using a clamp screw  25 . The sleeve  22  may be moved toward or away from the reducing body with the clamp  24  sufficiently loosened. A holding ring  26  is located between the wide end of the reducing body  20  and a seating surface  18   a  at the near end of the main housing body  18 . A masking device is inserted between the holding ring  26  and the seating surface  18   a , as discussed below. Bolts  28  pass through holes in a flange  20   b  at the wide end of the reducing body  20  and holes in the holding ring  26 , and are threaded into holes in the seating surface  18   a  of the main housing body  18  to hold these three housing parts together. The end cap  16  is fitted over the opposite end of the main housing body  18  and held there by retaining bolts  30  that pass through appropriate holes in the end cap and are threaded into holes in the main housing body. Bolts  31  pass through washers  32  and are threaded into holes  33  in the main housing body  18  to use in attaching the projector  12  to mounting apparatus, such as the mounting assembly  14 . 
     Optical devices are located within the housing of the projector  12 . An optical bench  34  is provided in the form of an elongate metal base that has two parallel flat surfaces  34   a  and  34   b  that are different distances from the longitudinal axis of the bench. A clamp  36  is attached to the optical bench  34  at one flat surface  34   a , and a second clamp  38  is attached to the bench at the second flat surface  34   b . Nuts and bolts  40  (one set is shown in FIG. 3) are used to attach the clamps  36  and  38  to the optical bench  34 . Bolts  42  pass through the main housing body  18  and spacers  44 , and are threaded into holes in the optical bench  34  to hold the bench in place within the light projector  12 . 
     Each of the clamps  36  and  38  comprises a metal strip that is folded to form five planes. Openings in the form of slots  36   a  are located in the central plane and both end planes of the clamp  36 . Openings in the form of slots  38   a  are located in the central plane and both end planes of the clamp  38 . Three slots  36   a  are arranged in a plane perpendicular to the longitudinal axis of the optical bench  34  to receive a round optical device, such as a lamp  46 . The folds of the clamp  36  are such that the lamp  46  may be forced into the slots  36   a  and be thereby held in place on the optical bench  34 . A second set of three slots  36   a  define another plane perpendicular to the longitudinal axis of the optical bench and hold another optical device, namely, a diffusing filter  48 . The clamp  36  has splits  36   b  to facilitate the placement of the two optical devices  46  and  48  within the slots in the folded planes. Two sets of three slots  38   a  each are similarly positioned in planes perpendicular to the longitudinal axis of the optical bench  34  to receive and hold optical devices. In particular, a double convex condensing lens  50  is held in one set of slots  38   a  of the clamp  38 . All of the optical devices  46 - 50  are mutually aligned on the optical bench  34  to define a longitudinal axis for the array of these optical devices. The spacers  44  position the optical bench  34  within the main housing body  18  so that the longitudinal axis of the array of optical devices  46 - 50  within the light projector  12  passes along the longitudinal axis L—L of the projector housing assembly  16 - 26 . 
     Additional optical devices are located in the focal lens sleeve  22 . A first objective focal lens  52  and a second objective focal lens  54  are held in position within the sleeve  22  by two snap-ring spacers  56  and  58 . Each of the projecting lenses  52  and  54  is a double convex lens. Other, alternative objective lenses may be used. For example, a single objective lens may be used, or up to four objective lenses may be included in the sleeve  22 , depending on the focal lengths of the lenses. The objective lenses may also be plano-convex rather than double convex. Further, the objective lenses may be coated to minimize surface reflections, and can be achromatic to correct for spherical and chromatic aberrations. Such coated and/or achromatic lenses are commercially available. A lip  22   a  at the front end of the sleeve  22  retains the adjacent spacer  58  within the sleeve. Movement of the sleeve  22  toward or away from the reducing body  20  as discussed above moves the objective lenses relative to the condensing lens to focus the light projector  12 . 
     When the light projector  12  is assembled, all of the optical devices  46 - 54  are aligned and centered on the longitudinal axis L—L of the light projector. 
     A receptacle  60  connects to electrical leads at the back of the lamp  46 , and an electrical lead line  62  extends from the receptacle and outside the housing assembly of the light projector  12  to connect to a source of electrical power to operate the lamp. A grommet  63  lines the hole in the housing assembly end cap  16  through which the lead line  62  exits the housing assembly to protect the lead line from wear that might otherwise be caused by contact with the metal end cap, and possible electrical shorting. A halogen light used as the lamp  46  produces a very intense central portion of the light beam due to light projecting directly from the lamp bulb rather than being reflected from the reflector behind the lamp bulb. As shown in FIG. 7, the diffusing filter  48  is a glass disk that has a central, circular portion  48   a  that is frosted, or etched, to diffuse the light in the intense, central portion of the beam, with the result that the intensity of light is more evenly distributed across the light beam from the lamp  46 . Light from the lamp  46 , having passed through the filter  48 , reaches the condensing lens  50  which forms an image of the light source in the lamp upon the first objective lens  52 . 
     As noted above, a masking device is held between the holding ring  26  and the seating surface  18   a  of the main housing body  18 , along the longitudinal axis of the light projector  12 . The light beam from the condensing lens  50  falls on the masking device which selectively blocks some of the light beam. The objective lenses  52  and  54  produce an image of the mask at the target, or object to be illuminated by the light projector. The image of the mask is the contour, or profile, of the cross-sectional area of the light beam that falls on the mask from the condensing lens  50  and is not blocked by the mask. Thus, the mask determines the contour of the cross-sectional area of the light beam incident on the target. Three versions of masking devices, with three matching holding rings, are illustrated and discussed herein. 
     While it is known to use a masking device including four shutter blades, an improved masking device with four shutter blades is shown in FIGS. 8-13. A mask including four shutter blades is shown generally at  64  in FIGS. 8 and 9. The mask  64  includes blades  66 ,  68 ,  70  and  72 , which are made of thin metal sheet. Blades  66 ,  68  and  70  have tabs  66   a ,  68   a  and  70   a , respectively, with pads  66   b ,  68   b  and  70   b  fixed to the tabs  66   a - 70   a , respectively, and a leading edge  66   c ,  68   c  and  70   c , respectively, that is concave. Each of the blades  66 - 70  is symmetric, with its tab  66   a - 70   a , respectively, and its concave edge  66   c - 70   c , respectively, each centered on the body of the blade. The fourth blade  72  of the mask  64  is also symmetric, but includes two tabs  72   a  and  72   b  which extend laterally from the ends of the blade, and are bent forward as shown. The blade tabs  72   a  and  72   b  have pads  72   c  and  72   d , respectively. The leading edge  72   e  of the blade  72  is also concave, and symmetric relative to the body of the blade and to the tabs  72   a  and  72   b.    
     In FIG. 9, the blades  66 - 72  are shown arranged about a representation in phantom of the cross section  74  of the light beam at the location of the seating surface  18   a  of the main housing body  18 . The position and orientation of each of the blades  66 - 72  shape the light beam cross section  74  by selectively blocking a portion of the light beam. The position and orientation of each of the blades  66 - 72  may be adjusted relative to the light beam cross section  74  as needed to achieve the desired contour of the light beam cross section at the object to which the light projector  12  is aimed. The concavity of the blade edges  66   c ,  68   c ,  70   c  and  72   e  provide a self-correcting feature to compensate for the curvature of the condensing lens  50  and produce straight edges in the light beam contour at the illuminated object. Straight edges at the blades have a tendency to produce curved lines due to curvature of the lens. The concavity of the blade edges  66   c ,  68   c ,  70   c  and  72   e  may be selected to match the curvature of the condensing lens  50  to achieve the compensation. Thus, several sets of shutter blades  66 - 72  with different blade edge curvatures may be provided. 
     A holding ring  76  specifically structured for use with the shutter blades  66 - 72  is shown in FIG.  10 . The blade holding ring  76  has a narrow lip, or ridge,  78 , around the edge of the ring, and a plurality of holes  80  for receiving the bolts  28  that attach the ring  76  between the reducing body flange  20   b  and the main housing body seating surface  18   a  (FIG.  3 ). The blades  66 - 72  are mutually overlapped and sandwiched between the holding ring ridge  78  and the seating surface  18   a , as indicated in FIG.  11 . The bolts  28  tighten in holes in the seating surface  18   a  and pinch the shutter blades between the ridge  78  of the holding ring  76  and the seating surface  18   a  to hold the blades fixed in position with compression 360° around the circumference of the ridge. 
     FIG. 12 is an end view, and FIG. 13 is a front angle view, of the light projector  12  with the shutter blades  66 - 72  positioned to provide a mask for the light beam emerging from the light projector. Before the bolts  28  are completely tightened, the blades  66 - 72  may be manipulated by hand, using their tabs  66   a ,  68   a ,  70   a , and  72   a  and  72   b , to achieve the desired masking pattern for the light beam. The pads  66   b ,  68   b ,  70   b ,  72   c  and  72   d  are made of high heat plastic or some other material to allow manipulation of the tabs  66   a ,  68   a ,  70   a ,  72   a  and  72   b  by hand while the tabs are hot from the heat of the lamp  46 . The bolts  28  are then tightened to fix the positions of the blades  66 - 71 . 
     The laterally extending tabs  72   a  and  72   b  of the bottom blade  72  allow adjustment by hand manipulation of the bottom blade when access to the light projector  12  from below the light projector is not available. Also, having the lateral tabs  72   a  and  72   b  on the bottom blade  72  rather than having a tab extending downwardly from the bottom blade allows greater latitude for placing the light projector  12  on the mounting system  14 , as discussed below. 
     A custom plate mask  82  shown in FIG. 14 is another type of masking device for selectively shaping the contour of the light beam emerging from the light projector  12 . The plate  82  is also made from thin metal sheet, such as shim stock, is generally rectangular, and features beveled corners  82   a  and  82   b . FIG. 15 shows a holding ring designed to hold the plate  82  against the seating surface  18   a  of the main body housing. The holding ring  84  has a shallow recess, or depression,  86  formed on one side that extends across the central passage of the ring. The recess  86  is open at one end and closed at its opposite end, with beveled corners  86   a  and  86   b  at the closed end. The plate mask  82  fits within the recess  86 , with the plate beveled corners  82   a  and  82   b  being received at the beveled corners  86   a  and  86   b  of the recess. With the holding ring  84  held between the reducing body flange  20   b  and the main housing body seating surface  18   a  by bolts  28  (FIG.  3 ), the recess  86  provides a pocket for receiving and holding the plate mask  82 . The bolts  28  pass through holes  88  in the ring  84 . However, the depth of the recess  86  is smaller than the thickness of the plate  82 . Therefore, after the plate  82  is positioned in the recess  86 , between the holding ring  84  and the seating surface  18   a , tightening the bolts  28  causes the holding ring to compress the plate against the seating surface, holding the plate in place. 
     The plate mask  82  illustrated features two holes  90  and  92  which are cut specifically to give the desired shape to the light beam emerging from the light projector  12 . In this case, the light beam is split in two beams. It will be appreciated that one or more holes of any shape may be cut in the plate mask  82  to achieve any desired configuration for the light from the projector  12 . 
     A glass slide photo mask  94  shown in FIG. 16 is yet another type of masking device for selectively shaping the contour of the light beam emerging from the light projector  12 . The slide mask  94  is constructed using a thin glass plate that is generally rectangular, and features beveled corners  94   a  and  94   b . FIG. 17 shows a holding ring  96  designed to hold the plate  94  against the seating surface  18   a  of the main body housing  18 . The holding ring  96  has a shallow recess, or depression,  98  formed on one side that extends across the central passage of the ring. The recess  98  is open at one end and closed at its opposite end, with beveled corners  98   a  and  98   b  at the closed end. The slide mask  94  fits within the recess  98 , with the slide beveled corners  94   a  and  94   b  being received at the beveled corners  98   a  and  98   b  of the recess. With the holding ring  96  locked between the reducing body flange  20   b  and the main housing body seating surface  18   a  by bolts  28  (FIG.  3 ), the recess  98  provides a pocket for receiving and holding the slide mask  94 . The bolts  28  pass through holes  100  in the ring  96 . Again, the depth of the recess  98  is smaller than the thickness of the photo mask  94 . Therefore, after the photo mask  94  is positioned in the recess  98 , between the holding ring  96  and the seating surface  18   a , tightening the bolts  28  causes the holding ring to compress the photo mask against the seating surface, locking the photo mask in place. 
     The glass slide mask  94  has a thin layer of photosensitized aluminum tape  102  held on one flat surface by an adhesive. The photosensitive tape  102  is exposed to light from the target to be illuminated, and then developed to produce a negative photograph of the target, as discussed above. However, the photo mask  94  is constructed using a glass plate. The slide mask  94  is removed from a light-tight packet, or envelope, (not shown) in the dark, and inserted into the pocket provided by the holding ring  96 , with the photosensitive tape  102  facing forward, toward the holding ring  96 . An aperture stop (not shown) is added to the light projector  12  as discussed above. The light projector  12  is aimed at the target to be illuminated, and light from external lamps (not shown) is directed toward the target. The photosensitive tape  102  on the slide mask  94  is exposed to light from the external lamps, reflected back from the target into the light projector. In this way, a photograph of the target is taken, with the projector  12  serving as a camera, and the photosensitized aluminum tape  102  on the glass plate  94  serving as the photographic film. 
     The external lamps are turned off, the slide mask  94  is removed from the projector  12  in the dark, and the photosensitive tape  102  is developed on the glass plate. A negative photographic image of the target is thus produced on the developed tape  102 . A sharp, pointed blade, such as are sold under the registered trademark X-ACTO®, is used to cut the developed tape  102  to remove from the glass plate  94  that part of the tape that bears the image of the target resulting in an opening in the opaque tape that is the shape of the target image. The glass slide mask  94  is then mounted in the light projector  12  to produce a light beam that will illuminate only the target. 
     Any number of openings may be cut in the tape  102  to illuminate targets. Also, nested shapes, such as “doughnuts,” may be cut out of the developed tape  102 . In FIG. 16, the shaped hole  103  contains an opaque island  104  so that the light beam projected through the glass slide mask  94  is generally tubular. Similarly, letters may be formed with floating centers, such as in an “A,” or “O,” for example. 
     Details of the mounting assembly  14  of FIG. 1 may be further appreciated by reference to FIGS. 18-22. In FIG. 18 the mounting assembly is shown generally at  14 , and includes a frame  106  and a saddle  108 . The frame  106  includes an annular flange  110  and two retainer walls  112  and  114 . The retainer walls  112  and  114  are on opposite sides of the space within the flange  110 , and perpendicular to the plane of the flange. The saddle  108  includes a cross member  116  and two end walls  118  and  120  at opposite ends of the cross member, and perpendicular to the cross member. A cylindrically curved seat  122  is formed in the middle of the cross member  116 . A plurality of slots  124  is provided in the seat  116 . The slots  124  are structured with grooves, or notches,  124   a  facing each other along the opposite long sides of each slot. Each pair of facing grooves  124   a  forms a hole for receiving a bolt passing through the slot  124 , such that the bolt is constrained against movement along the slot. 
     In FIGS. 19-22 a mounting assembly is shown generally at  14 A. The design of the mounting assembly  14 A of FIGS. 19-22 is the same as the design of the mounting assembly  14  of FIGS. 1 and 18, and identical parts of the two mounting assemblies are labeled by the same numbers, with the exception of the flange of the frame  106 . The frame flange  110  of the mounting assembly  14  of FIGS. 1 and 18 has four holes  126  for receiving sheet metal screws  128  (FIG. 18) to be used for holding the mounting assembly in place in an installation, and four matching guide holes  130  for receiving guide pins, as discussed below. The mounting assembly  14 A of FIGS. 19-22, with a flange  110 A, is used in installations that do not require the use of screws, or bolts, or guide pins, passing through the frame flange  110 A. Therefore, the frame flange  110 A of the mounting assembly  14 A does not have the holes  126  and  130  of the frame flange  110  of the mounting assembly  14 , and is also narrower than the frame flange  110 . 
     Referring now to FIGS.  1  and  18 - 22 , it can be seen that the mounting assemblies  14  and  14 A each provide the same dual pivot system. Four threaded bushings  132   a ,  134   a ,  136   a , and  138   a  are provided in holes in the frame retainer wall  112 , and four threaded bushings  132   b ,  134   b ,  136   b , and  138   b  (designated in phantom in FIGS. 20 and 22) are provided in holes in the frame retainer wall  114 , with each bushing in one retainer wall in the same position in the wall as is one bushing in the opposite retainer wall. The bushings  132   a  and  136   a  provide two pivot receptacles in the retainer wall  112 , and the bushings  132   b  and  136   b  provide two pivot receptacles in the retainer wall  114 . The bushings  134   a  and  138   a  provide two guide receptacles in the retainer wall  112 , and the bushings  134   b  and  138   b  provide two guide receptacles in the retainer wall  114 . Pivot holes, not visible and therefore designated in phantom at  140   a  and  140   b  in FIGS. 19-22, are provided at the end of each saddle end wall  118  and  120 , respectively, again with these two pivot holes in the same position in the respective end wall. An arcuate guide slot  142   a  is provided in one saddle end wall  118 , and a like arcuate guide slot  142   b  is provided in the other saddle end wall  120 , with the two arcuate guide slots positioned in the same relative place on their respective end walls. 
     Four bolts  144   a ,  144   b ,  146   a , and  146   b  are used in conjunction with the threaded receptacles  132   a - 138   b  to configure the mounting assembly  14 / 14 A in one pivot arrangement or the other. Bolts  144   a  and  144   b  serve as pivot members, and bolts  146   a  and  146   b  serve as guide members. 
     In FIGS. 1,  18 ,  19 , and  21  bolt  144   a  passes through the pivot hole  140   a  at the end of the saddle wall  118  and is threaded through the first pivot receptacle  132   a  in the retainer wall  112 , and bolt  144   b  passes through the pivot hole  140   b  at the end of the saddle wall  120  and is threaded through the first pivot receptacle  132   b  in the retainer wall  114 . The pivot member bolts  144   a  and  144   b  thus provide an axle, and define a first pivot axis, passing through the first pivot receptacles  132   a  and  132   b , about which the saddle  108  may pivot, or rotate, relative to the frame  106 . Such rotation is limited by the guide member bolts  146   a  and  146   b  passing through the arcuate guide slots  142   a  and  142   b  in the end walls  118  and  120 , respectively, and being threaded into the first guide receptacles  134   a  and  134   b  in the retainer walls  112  and  114 , respectively. If the pivot members  144   a  and  144   b , and the guide members  146   a  and  146   b , are not tightened in the respective threaded holes  132   a - 134   b , the saddle  108  is free to be moved in an arc about the first axis defined by the pivot members in the holes  132   a  and  132   b , and limited by the arcuate holes  142   a  and  142   b  in the saddle moving relative to the guide members  146   a  and  144   b  in the guide receptacles  134   a  and  134   b , respectively. Tightening the bolts  144   a - 146   b  causes the saddle  108  to be locked, by friction, in a selected position relative to the frame  106 , as shown in FIGS. 1,  18 ,  19 , and  21 , for example. 
     In FIGS. 20 and 22 pivot member bolt  144   a  passes through the pivot hole  140   a  at the end of the saddle wall  118  and is threaded through the second pivot receptacle  136   a  in the retainer wall  112 , and pivot member bolt  144   b  passes through the pivot hole  140   b  at the end of the saddle wall  120  and is threaded through the second pivot receptacle  136   b  in the retainer wall  114 . The pivot member bolts  144   a  and  144   b  thus provide an axle, and define a second pivot axis, passing through the second pivot receptacles  136   a  and  136   b , about which the saddle  108  may pivot, or rotate, relative to the frame  106 . Such rotation is limited by the guide member bolts  146   a  and  146   b  passing through the arcuate guide slots  142   a  and  142   b  in the end walls  118  and  120 , respectively, and being threaded into the second guide receptacles  138   a  and  138   b  in the retainer walls  112  and  114 , respectively. If the pivot members  144   a  and  144   b , and the guide members  146   a  and  146   b , are not tightened in the respective threaded holes  136   a - 138   b , the saddle  108  is free to be moved in an arc about the second axis defined by the pivot members in the holes  136   a  and  136   b , and limited by the arcuate holes  142   a  and  142   b  in the saddle moving relative to the guide members  146   a  and  144   b  in the guide receptacles  138   a  and  138   b , respectively. Tightening the bolts  144   a - 146   b  causes the saddle  108  to be locked, by friction, in a selected position relative to the frame  106 , as shown in FIGS. 20 and 22, for example. 
     It will be appreciated that a wide range of orientations of the saddle  108  may be achieved relative to the frame  106  with the use of the dual pivot system, with its two axes of pivot, or rotation, from which to choose, and the arcs through which the saddle may be positioned relative to the axes. 
     The light projector  12  is attached to the saddle  108  by a wing bolt  32  passing through one of the grooved slots  124  in the seat  122  of the saddle cross member  116  and threaded into a hole  33  in the light projector main housing body  18 , as indicated in phantom in FIG.  21 . The use of grooves  124   a  insures that the light projector  12 , once removed from the saddle  108 , may be reinstalled in the same orientation in the saddle by passing the bolt  32  through the same groove in the same slot  124 . The plurality of the slots  124  allows the light projector  12  to be so attached at different selected positions along the seat  122 , and thus at different positions relative to the frame  106 . If an old style shutter blade masking device is used with the light projector  12 , the tab protruding from the bottom shutter blade would limit the positioning of the light projector along the seat  122 , requiring the light projector to be positioned low, or forward, enough for the tab to be in front of the seat. The improved shutter blade mask shown in FIGS. 8,  9 ,  12  and  13  has the dual tabs  72   a  and  72   b  of the bottom shutter blade  72  extending laterally, and thus avoiding interference with the saddle seat  122  regardless of the position of the light projector  12  along the seat. 
     The dual pivot system of the mounting assemblies  14  and  14 A provides new and extensive capabilities for orienting a light projector  12 , including positioning the light projector to aim vertically. Further, the light projector  12  may also be selectively positioned at a variety of locations along the saddle seat  122 . 
     The frame retainer walls  112  and  114  have openings cut, and material folded outwardly, to form end brackets  148   a  and  148   b , respectively. The flanges  110  and  110 A are cut to form a structured, generally elongate hole  150   a  and  150   b  below each end bracket  148   a  and  148   b  as shown. The end brackets  148   a  and  148   b  and the flange holes  150   a  and  150   b  are used in installations of the mounting assemblies  14  and  14 A, as discussed below. 
     In general, a light projector according to the present invention may be installed above a ceiling for projection of light through the ceiling toward a selected target. The light projector may be positioned within a housing, which is placed above the ceiling. Several different types of installations are described and illustrated. 
     FIGS. 23 and 24 show an arrangement that may be used during the construction of a room, for example, wherein a housing may be installed before the ceiling is completed, but where no access from above the ceiling is available after completion of the construction. The housing includes a square, aluminum box, or enclosure,  152  having a removable top  154  that is held on by screws  156 . A round hole  158  breaks the bottom of the box  152  and is surrounded by a downwardly extending lip  160 . Multiple brackets  162  are adjustable by sliding in sleeves  164  attached to the sides of the enclosure  152 . The box  152  is positioned above a ceiling among beams or the like, and the brackets  162  are adjusted so that they may be fixed to beams by nails or screws passing through holes  165  in the ends of the brackets to anchor the box. A recess  166  is provided in the enclosure  152 , with an electrical receptacle  167  positioned in the back of the recess. An electrical connection box (not visible) is joined to the outside of the recess  166 , and provides terminals by which electrical power may be received at the receptacle  167 . The enclosure  152  is thus positioned and mounted among ceiling rafters or the like so as to accommodate the recess  166  and the external electrical connection box. A mounting assembly  14 A is positioned within the enclosure  152  to hold the light projector  12  as discussed above. The recess  166  provides room to receive the back end of the light projector  12  in various orientations of the projector. The electrical lead line  62  from the projector lamp  46  (FIG. 3) is covered in heat insulation and connected to a plug  168 , as indicated in FIG. 23, which is received by the receptacle  167 . 
     After the enclosure  152  is anchored above the ceiling with the light projector  12  and mounting assembly  14 A in place, the bottom hole  158  may be closed using a circular cover plate  170 . The diameter of the cover plate  170  is such that the upwardly curved edge of the cover plate just closes over the bottom edge of the lip  160 . The cover plate  170  is broken by an elliptical light projection hole  172 . As shown in FIG. 25, the hole  172  receives the light projector focal lens sleeve  22  that extends down beyond the bottom edge of the lip  160 . A hood  174  across the hole  172  shrouds the sleeve  22  to provide a finished look to the installation. The hood  174  is shaped as a portion of a cylinder. FIG. 26 illustrates an alternative hood  174   a , which is shaped as a portion of a sphere. Either hood  174  or  174   a  may be used with the plate  170  to shroud the sleeve  22 . 
     The cover plate  170  is held in place against the bottom edge of the lip  160  by two spring hangers  176  and  178 . The hanger  176  is made from a single wire that is wrapped multiple times around a hub  180  attached to the top surface of the cover plate  170 , with the wire extending from the hub to form two arms, as shown in FIG.  24 . Similarly, the hanger  178  is made from a single wire that is wrapped multiple times around a hub  182  attached to the top surface of the cover plate  170 , with the wire extending from the hub to form two arms, as shown in FIG.  24 . The wrapping of the wires of the arms  176  and  178  about the hubs  180  and  182 , respectively, renders the arm structures elastic about the hubs. The arms of the hangers  176  and  178  are sufficiently resilient that they may be squeezed together to fit through the holes  150   a  and  150   b  of the flange  110 A (FIGS. 19-22) and be received within the retainer wall end brackets  148   a  and  148   b , respectively. The hub mountings  180  and  182  fit through the wider portions of the holes  150   a  and  150   b . When the arms of the hangers  176  and  178  are released within the brackets  148   a  and  148   b , the arms are captured and held by the brackets. The cover plate  170  may be pushed up against the bottom of the lip  160 , forcing the hangers  176  and  178  further through the brackets  148   a  and  148   b , respectively, allowing the hanger arms to spread apart. The frictional forces between the brackets  148   a  and  148   b  and the hangers  176  and  178  hold the cover plate  170  in place, generally even with the surrounding surface of the ceiling (not shown). 
     In addition to adjusting the position of the light projector  12  along the saddle seat  122 , and tilting the saddle  118  about one or the other of the two pivot axes provided by the mounting assembly  14 A, the mounting assembly itself may be rotated about the interior of the housing  152  to select the vertical plane along which the light projector will be oriented. Nuts and washers  184  are tightened down on the flange  110 A on bolts  186  passing through the bottom of the enclosure  152  to hold the flange fixed relative to the enclosure when the flange is in the desired orientation. 
     During construction, access is available from above the ceiling to install the enclosure  152  and its contents from above the ceiling. The enclosure  152  may be placed on a beam or ceiling member  188 , and otherwise anchored in place using the adjustable brackets  162  as discussed above. The lip  160  extends down through the ceiling member  188  so that the plate  170  is at the level of the ceiling bottom surface when the plate is held against the lip. The orientation of the light projector  12  may be adjusted through the bottom hole  158 . Further, the light projector mask may be adjusted from below, through the same hole  158 . A shutter blade mask is included in the light projector  12  shown in FIG. 23, and the shutter blades may be adjusted as needed, for example. After adjustments to the light projector are completed, the cover plate  70  may be put in place. At any time after installation, and completion of the ceiling construction, the cover  170  may be pulled down and the light projector accessed though the bottom hole  158 . The plate  170  may be suspended below the level of the ceiling on the hangers  176  and  178  while the hangers are still held by the end brackets  148   a  and  148   b , or with the hangers instead held by friction by the edges of the structured holes  150   a  and  150   b  in the flange  110 A (FIGS.  19 - 22 ). The ends of the arms of the hangers  176  and  178  are bent so that they may be caught either against the end brackets  148   a  and  148   b , or against the edges of the structured flange holes  150   a  and  150   b , as alternatives for suspending the plate  170  during maintenance or adjustment operations. 
     FIG. 27 shows an alternate cover plate  170   a , featuring a central, circular light projection hole  172   a  for receiving the focal lens sleeve  22  when the light projector is oriented to project light vertically, or nearly vertically, downwardly. Otherwise, the cover plate  170   a  may be like the cover plate  170 , including having the two spring hangers  176  and  178  for suspending the cover plate  170   a  against the enclosure lip  160 , for example. 
     FIGS. 28 and 29 show an installation which can be mounted with or without access from above a ceiling, and be used in new construction or in remodeling existing construction. The completed installation is floated with the ceiling to produce a continuous finish. The housing of the arrangement includes a square, aluminum box, or enclosure,  190  having a removable top  192  that is held on by screws  194 . A round hole  196  breaks the bottom of the enclosure  190 . A rectangular, aluminum panel  198  is used to support the enclosure  190 . The panel  198  is sized, with one side longer than the other side, to fit against beams or the like in the ceiling structure, and held there by flat head nails or screws  199  passing through tapered holes  200  along the periphery of the panel and into the beams. The panel  198  has a round hole  202  that is larger in diameter than the bottom hole  196  of the enclosure  190 . The enclosure  190  is fixed to the panel  198  with nuts  184  tightened down on bolts  186  (FIG. 27) passing through holes  204  in the panel, arranged about the panel hole  202 , and corresponding holes in the bottom of the enclosure, arranged about the hole  196 . Thereafter, the enclosure  190  is positioned between ceiling beams and the panel  198  anchored to the beams as noted above. A recess  166  is provided in the enclosure  190 , with an electrical receptacle  167  positioned in the back of the recess. An electrical connection box (not visible) is joined to the outside of the recess, and provides terminals by which electrical power may be received at the receptacle  167 . The enclosure  190  is thus positioned and mounted among ceiling rafters or the like so as to accommodate the recess  166  and the external connection box. A mounting assembly  14 A is positioned within the enclosure  152  to hold the light projector  12  as discussed above. The recess  166  provides room to receive the back end of the projector  12  in various orientations of the projector. The electrical lead line  62  from the projector lamp  46  (FIG. 3) is covered in heat insulation and connected to a plug  168 , as indicated in FIG. 28, which is received by the receptacle  167 . 
     The enclosure bottom hole  196  and the panel hole  202  may be closed using a circular cover plate  170   b , which receives the focal lens sleeve  22  of a projector  12  in the elliptical light projection hole  172 , as discussed above in connection with the arrangement of FIGS. 23 and 24. The edge of the cover plate  170   b  is flat, but in all other aspects the cover plate  170   b  may be like the cover plate  170 . Either the semi-cylindrical hood  174  of FIG. 25 or the semi-spherical hood  174   a  may be used with the cover plate  170   b . The diameter of the cover plate  170   b  is such that it just fits within the panel hole  202  and is held against the bottom of the enclosure  190  by the two spring hangers  176  and  178 , which function as discussed above. Alternatively, a version of the cover plate  170   a  of FIG. 27 may be used for vertical, or nearly vertical, orientations of the light projector  12 , providing the edge of the plate is flat (not shown). 
     The mounting assembly  14 A is positioned in the bottom of the housing  190 , and rotated to a desired orientation. Thereafter, the mounting assembly  14 A is held in place by the nuts and washers  184  tightened down against the frame flange  110 A on the bolts  186  holding the panel  198  to the enclosure  190 . 
     After the enclosure  190  is attached to ceiling structural members using the panel  198  as noted above, the panel is floated and textured to match the ceiling for a continuous finish. The periphery of the panel  198  where the screws or nails are used in the countersunk holes  200  is offset so that the floating material deposited along the periphery provides a finish surface that is at the same level as the finished surrounding ceiling material. The orientation of the light projector  12  may thereafter be adjusted through the holes  196  and  202 . Further, the light projector mask may be adjusted from below, through the same holes  196  and  202 . Again, a shutter blade mask is included in the light projector  12  shown in FIG. 29, for example. After adjustments to the light projector are completed, the cover plate  170   b  may be put in place, flush with the plate  198  and the surrounding ceiling to present a continuous surface finish. The orientation of the cover plate  170   b  will match the orientation of the projector  12  as the hangers  176  and  178  are passed through the mounting assembly flange holes  150   a  and  150   b  and received by the end brackets  148   a  and  148   b , respectively. At any time after installation, the cover  170   b  may be pulled down and the light projector accessed though the holes  196  and  202 . 
     FIGS. 18,  30  and  31  show an installation that is useful in remodeling operations, for example, wherein no access from above the ceiling is available to carry out the installation itself. A housing for the installation includes a round, aluminum enclosure  210  having a removable top  212  that is held on by screws  214 . The bottom of the enclosure  210  is open. A recess  166  is provided in the enclosure  210 , with an electrical receptacle  167  positioned in the back of the recess. An electrical connection box (not visible) is joined to the outside of the recess, and provides terminals by which electrical power may be received at the receptacle  167 . The recess  166  provides room to receive the back end of a light projector  12  in various orientations of the projector. The electrical lead line  62  from the projector lamp  46  (FIG. 3) is covered in heat insulation and connected to a plug  168 , as illustrated n FIG. 30, which is received by the receptacle  167 . 
     The enclosure  210  is inserted upwardly into a hole cut in an existing ceiling  216 . Four retaining clips  218  are used to anchor the installation to the ceiling  216 . The construction and use of the retaining clips  218  may be appreciated by reference to FIGS. 18,  32  and  33 . Each retaining clip  218  has two flat segments, or plates, at 90° relative to each other, and each plate has a hole. A guide pin  218   a  extends from one of the flat plates. A nut  220 , sold under the registered trademark TINNERMAN®, is slipped over the flat plate, not including the guide pin  218   a , of each retaining clip  218  and the holes in the nut are aligned with the plate hole. As shown in FIG. 32, a TINNERMAN® nut comprises a folded metal strip with mutually aligned holes that can receive a screw that threads into the holes. After the enclosure  210  has been inserted into the hole in the ceiling drywall  216 , each of the retaining clips  218  is installed with its flat plate with the TINNERMAN® nut inserted horizontally through a slot in the side of the enclosure, as shown in FIG. 18. A plastic snap-in pin  222  is passed through the hole in the other, vertical flat plate of the retaining clip  218 , and then through a hole in the side of the enclosure  210 . The snap-in pin  222  is held in the side hole of the enclosure  210  by friction, to thereby hold the retaining clip  218  fixed to the enclosure. The horizontal flat plates of the four retaining clips  218  extend radially outwardly from the enclosure  210  above the level of the top of the ceiling drywall  216  and rest on the top of the drywall so that the ceiling thus supports the enclosure. At the same time, the guide pins  218   a  extend vertically downwardly below the bottom edge of the enclosure  210 , as shown in FIG.  18 . 
     A mounting assembly  14  is placed in position against the bottom of the enclosure  210 . The outer diameter of the frame flange  110  is greater than the diameter of the enclosure  210 , as well as the diameter of the hole in the ceiling material  216 . As the mounting assembly  14  is raised, the guide pins  218   a  are received in the guide holes  130  in the flange  110  (FIG.  18 ), and orient the mounting assembly so that the screw holes  126  in the flange  110  are aligned with the holes in the horizontal plates of the retaining clips  218 . The sheet metal screws  128  are then passed through the flange screw holes  126  and threaded into the holes in the TINNERMAN® nuts  220  enclosing the horizontal plates of the retaining clips  218  to anchor the mounting assembly  14  and the enclosure  210  to the ceiling  216 . Then, the portions of the guide pins  218   a  that extend down below the bottom of the frame flange  110  may be broken off. 
     A light projector  12  may be joined to the mounting assembly  14  either before or after the mounting assembly is installed in the housing  210 . With the light projector  12  installed and electrically connected to the power source by way of the receptacle  167  in the recess  166 , a cover plate  170  is installed, using the hangers  176  and  178  to engage the end brackets  148   a  and  148   b  on the mounting assembly  14  as discussed above, to cover the bottom of the mounting assembly  14  and provide a finished look to the installation. The upwardly curved edge of the plate  170  fits around the outer edge of the flange  110 . Again, the focal lens sleeve  22  of the light projector  12  passes through the elliptical light projection hole  172  in the cover plate  170 , and is partially shrouded by the hood  174  to complete the finished look of the installation. Alternatively, the semi-spherical hood  174   a  of FIG. 26 may be used rather than the semi-cylindrical hood shown in FIG.  30 . Also, for a vertical, or near vertical, orientation of the light projector  12 , the cover plate  170   a  of FIG. 27 may be used with the focal lens sleeve  22  extending through the central, circular opening  172   a.    
     The orientation of the light projector  12 , and the setting of its mask device, such as the shutter blades indicated by the presence of the shutter blade tabs  66   a - 72   b  in FIG. 31, may be made by access through the bottom of the enclosure  210  and of the mounting assembly  14 , with the cover plate  170  lowered or disengaged from the mounting assembly. 
     FIGS. 31-36 show a custom installation for use in either new construction or in remodeling, and where an aperture sized just to receive the end of the focal lens sleeve  22  of a light projector  12  included in the installation is the only opening left in the ceiling. The housing of the installation includes a square, aluminum enclosure  226  having a removable top  228  that is held on by screws  230 . A round hole  231  breaks the bottom of the enclosure  226 . Multiple brackets  162  are adjustable by sliding in sleeves  164  attached to the sides of the enclosure  226 . The enclosure  226  is positioned above the ceiling among beams or the like, and the brackets  162  are adjusted so that they may be fixed to beams by nails or screws passing through holes  165  in the ends of the brackets to anchor the housing. A recess  166  is provided in the enclosure  226 , with an electrical receptacle  167  located in the back of the recess. The enclosure is positioned and mounted among the ceiling beams or the like so as to accommodate the recess  166 , protruding from the side of the enclosure. The recess  166  provides room to receive the back end of the light projector  12  in various orientations of the projector. The electrical lead line  62  from the projector lamp  46  (FIG. 3) is covered in heat insulation and connected to a plug (as seen in FIGS. 23,  28  and  30 ), which is received by the receptacle  167 . 
     A mounting assembly frame  106 , having a flange  110 A and two retainer walls  112  and  114 , as seen in FIGS. 19-22, is positioned within the enclosure  226 . Nuts and washers  184  are tightened down on bolts  186  passing through the bottom of the enclosure  226  to hold the flange  110 A fixed in a selected orientation within the enclosure. A metal strap  234 , having multiple perforations  236 , extends between the retainer walls  112  and  114 , to which the strap is joined. For example, one end of the strap  234  may be anchored to the retainer wall  112  by using wing bolts  238  passing through holes  236  in the strap and threaded into the bushings  136   a  and  138   a , and the other end of the strap may be anchored to the retaining wall  114  by wing bolts  240  passing through holes in the strap and threaded into the bushings  136   b  and  138   b . The strap  234  passes over the light projector  12 , and is joined to the light projector by a wing bolt  242  passing through a strap hole  236  and threaded into a hole  33  in the main housing body  18  of the light projector. The light projector  12  is oriented in a desired position within the enclosure  226 , and held in place, in part, by the strap  234  being manipulated and tightened accordingly. Other combinations of the retaining wall bushings  132   a - 138   a  and  132   b - 138   b  may be used to anchor the ends of the strap  234 , and a longer or shorter strap may be used, as appropriate to achieve the desired orientation of the light projector  12 . Plaster of paris  243  is formed around the forward end of the light projector  12  at the bottom of the enclosure  226  to solidify the positioning and anchoring of the light projector. As a result, the light projector  12  is anchored and supported in place by a three-point attachment. 
     A heat guard  244  in the form of a metal disk is positioned within the bottom hole  231  of the enclosure  226 . The heat guard  244  provides an oblong hole  246  for receiving the focal lens sleeve  22  of the light projector  12  throughout a range of tilt angles, and the heat guard is rotatable within the enclosure bottom hole  231  to accommodate the light projector oriented in any vertical plane. The heat guard  244  also provides a central, round hole  248  to receive the focal lens sleeve  22  when the light projector  12  is oriented vertically, or nearly vertically. The heat guard holes  246  and  248  are formed by punching out knock-outs provided in the heat guard  244 , as indicated by dashed lines in FIG. 34, as needed, leaving one or the other of the knock-outs intact. In the completed installation, ceiling material, such as dry wall,  250  is installed below the enclosure  226  and the heat guard  244  to support the heat guard and to finish the ceiling, as seen in FIG.  36 . The heat guard  244  serves to reduce any heat generated by the light projector  12  in operation that might otherwise reach the ceiling material  250 . Only the end of the focal lens sleeve  22  is visible below the ceiling material  250  in the completed installation. 
     Use of the space within the enclosure  226  that is provided by the recess  166  to accommodate the light projector  12  in various orientations is illustrated in FIG. 36, wherein the back end of the light projector is shown protruding into the recess. The external connection box  252 , discussed above in connection with the enclosures shown in FIGS. 23,  24  and  28 - 31 , is shown joined to the back of the recess  166 . An electrical lead  254  extends from the connection box toward a source of electrical power to operate the light projector  12 . The electrical connection box  252  is joined to the receptacle  167 , which receives the heat-insulated projector lamp electrical lead  62 . 
     After installation of the enclosure  226 , the only access to the light projector  12  within is from above the ceiling, through the top of the enclosure with the top  228  removed. Thus, with shutter blades used in the light projector  12  as a mask device, as indicated in FIG. 31 by the presence of the shutter blade tabs  66   a - 72   b , advantages of the shutter blades of the present invention are clear. First, the light projector  12  sits on the bottom of the housing  226 , which would make use of a shutter blade with a tab protruding from the bottom of the light projector impracticable, if not impossible. Secondly, since access to the light projector  12  is available only from above, adjustment of a shutter blade tab protruding from the bottom of the light projector would again be impracticable, if not impossible. The laterally extending tabs  72   a  and  72   b  of the bottom shutter blade  72  in FIG. 31 makes the use of a bottom shutter blade, and the adjustment of such a shutter blade, possible and workable. 
     The light projector  12  may be oriented in a variety of directions within the enclosure  226 , including pointing vertically downwardly. Such varied orientations of the light projector  12  are achieved by adjusting the length of the strap  234  between the retainer walls  112  and  114 , and bending the strap as needed to position the light projector as desired. The plaster of paris  243  completes the anchoring of the light projector  12 . 
     The lighting system installations of FIGS. 23-29 provide the capability of aiming the light projector  12  in any vertical plane by selectively orienting the mounting assembly  14 A in the desired direction within the enclosure  152  or  190 . The orientation of the mounting assembly  14  to aim the light projector  12  in any vertical plane in the installation of FIGS. 30-33 is achieved by selectively orienting the enclosure  210  relative to the ceiling  216 . The orientation of a light projector  12  in any vertical plane in the installation of FIGS. 34-36 is performed by placing the elliptical light projection hole  244 , and the mounting frame  106 , so as to receive the light projector in the desired direction. The strap  234  may also be bent to assist in aiming the light projector  12  from side to side as well as up and down. The installations of FIGS. 23-29 also include the capability of orienting the light projector  12  in a wide range of directions within the selected vertical plane, using the dual pivot system of the mounting assembly  14  or  14 A. The orientation of the light projector  12  in the installation of FIGS. 34-36 in a selected vertical plane is achieved by bending, and adjusting the length of, the strap  240  to raise or lower the rear of the light projector. In all installations of FIGS. 23-36, the light projector  12  may be oriented to project a light beam vertically downwardly. 
     The present invention thus provides improved contour lighting systems, including an improved shutter blade mask and an improved photo mask. A diffusing filter is provided for the light projector to reduce direct, high intensity light in the center of the light beam from the light projector lamp. An optical bench and clamps are provided to mount optical devices within the light projector. A new mounting assembly features a dual pivot system that increases the orientations available for a light projector using a single mounting device. New housings provide installations in new constructions, or remodeling of completed constructions, with enhanced ability to aim a light projector from an installation enclosure, and provide a finished look to the installations. 
     The foregoing disclosure and description of the invention is illustrative and explanatory thereof, and various changes in the size, shape and materials as well as in the details of the illustrated construction may be made within the scope of the appended claims without departing from the spirit of the invention.