Abstract: Method and apparatus for reflecting light constrained to travel within a prism light guide such that the reflected light is refracted by and escapes through a selected portion of the light guide wall at a selected angular orientation with respect to the guide.

Abstract: The present invention provides a brightness equalizing light filter system which can be utilized as the bottom panel or as one of a set of bottom panels in an indirect fluorescent light fixture to evenly illuminate the fixture to approximately the same degree of brightness as the surrounding area which it lights. The brightness equalizing light filter system comprises a translucent diffuser panel with an opaque, electrically-connected pattern of thin metal film deposited thereon, wherein the density of the opaque pattern for each point on the panel is proportional to (or the linear function of) the intensity of light impinging on that point from the light source. The metal film serves both as the required electrical ground to act as a starting aid for the lamps and as a reflecting surface to increase the photometric efficiency of the fixture.

Abstract: A projector type headlamp in which the reflecting surface of a reflector is not the surface geometically decided but composed of a great many minute face elements smoothly connected with each other and the orientation of each face element with respect to the optical axis is decided such that the light incident from a light source is reflected to the vicinity of a meridional image plane of a convex lens and a desired luminosity distribution can be obtained at the position of a shade. According to the headlamp, it is possible to control a distribution pattern so as to have a desired luminosity distribution and to utilize the light emitted from the light source effectively.

Abstract: A light fixture for providing a cool uniform illumination into a photography field which is adjustable in intensity while maintaining a uniform color temperature. The light fixture includes a light source, an adjustable shutter for adjusting the amount of light passing therethrough, a reflector mirror having a dichroic heat coating thereon for reflecting the light from the shutter while passing any heat contained therein, and a round reflector for receiving the light from the reflector mirror through an end face and for dispersing the light through the circumference thereof by internal reflectance.

Abstract: The invention is directed to a vehicle headlight including a projection lens secured by a covering disk. No diaphragm is interposed between light source and the projection lens. The lens having the shape of a flat sector of a cylinder with a cut-off apex. An inner lens surface having a uniform curvature and an outer lens surface having a toroidal curvature.

Abstract: A low beam headlamp for motor vehicles includes an objective made of pressed glass whose one side is formed as aspheric partial surfaces of identical or different aspherity. The partial surfaces are staggered in the direction parallel to the optical axis of the objective and the resulting step has rounded edges. The aspheric partial surfaces adjust light distribution to achieve a desired quality of the light-dark boundary zone projected on the driveway, and provide corrected color fringes of the passing light beam.

Abstract: A display unit has a light source, an indicia bearing diffusion sheet or transparent having masked, transparent and translucent areas and a series of refractive layers are placed over the diffusion sheet. On the light being lit, and the light rays passed outwardly through the transparent or translucent areas and through the refractive layers, the indicia are each surrounded with a penumbra of light which gives a three dimensional effect to the display of the indicia.

Abstract: A dipped headlight for a motor vehicle, capable of generating a dipped beam situated beneath a generally horizontal cutoff, the headlight being of the type comprising a lamp having an axial filament (100) emitting light freely in all directions thereabout, a reflector (200) having an axis (Ox) extending beneath the axis of the filament and parallel thereto, said reflector also including a surface without discontinuity, and said headlight further including a closure glass placed in front of the reflector and suitable for spreading said beam in a horizontal direction, said headlight including the improvement whereby the reflector includes two diametrically opposite first quadrants (201, 202) whose surfaces are at least approximately two portions of paraboloids having focuses situated in the vicinity of respective axial ends of the filament in order to generate filament images which provide light concentration situated beneath the cutoff and offset sideways relative to the headlight axis, with the other two quad

Abstract: In a spot projector having a reflector, a coiled filament lamp, a gate and a lens, improved light output efficiency is provided by locating the virtual filament center intermediate the reflector and the natural focus of the reflector. The gate is provided with an aperture which is substantially equal to or larger than the aperture of the reflector to accomodate the divergence of light rays produced by locating the filament to the rear of the focus point. Because the distribution of the light rays which emanate from the filament approximates a cosine distribution, and because the location of the virtual filament is behind the actual focus point, the percentage of light rays which are projected transversely through a region between the reflector and the gate is substantially reduced, and a correspondingly greater amount of filament illumination is reflected through the gate aperture, thereby producing a brighter image than would be produced by the same lamp located forward of the focus.

Abstract: An illumination system for illuminating a line on a document which illumination, when reflected and focused via a lens on a sensor (or image plane), has substantially uniform light intensity along the length of the line. The illumination system includes means for compensation for lens cosine to the fourth power fall-off and an illumination cosine fall-off phenomenon, which has classically been treated as proportional to cosine to the fourth power but in the example of lamps made of coiled tungsten filaments located along the axis of the foci, is more nearly cosine to the 2.8th power. The compensation apparatus includes a cylindrical ellipse for focusing light from two lamps located on an axis which is one foci of the ellipse and the line on the document is located at the other foci of the ellipse. Reflected light from the line on the document is then reflected and focus via a lens onto a sensor. At the sensor, the image is captured for analysis or other uses, e.g.

Abstract: A screened vehicular headlight with an ellipsoidal reflector has a source of light positioned in the reflector's first focal area. The headlight has a collecting lens positioned in the path of the rays behind the second focal area and accommodated in a rectangular area of a holder. A screen that produces a light-dark border is positioned between the collecting lens and the reflector and in the focal area of the lens. A transparent cover over the collecting lens has margins extending radially beyond the lens.

Abstract: An alignment reference device provides a collimated laser beam that minimizes angular deviations therein. A laser beam source outputs the beam into a single mode optical fiber. The output end of the optical fiber acts as a source of radiant energy and is positioned at the focal point of a lens system where the focal point is positioned within the lens. The output beam reflects off a mirror back to the lens that produces a collimated beam.

Abstract: A reflector for obtaining isolux light distribution patterns over polygonal areas is disclosed. The reflector is equipped with a plurality of circumferentially adjacent light transmissive wall sections corresponding in number to the number of corners of the polygonal light pattern. A reflective coating and vertically oriented prisms formed on the outer surface of the wall sections cooperate to reflect and laterally redirect light to provide the desired isolux polygonal light pattern.

Abstract: A periscopic lens in a lamp assembly in which parallel light rays are twice reflected and pass through optical surfaces which control the light distribution pattern beyond the lamp assembly. The light rays enter the lens and emerge only from alternate lens facet surfaces, with the surfaces or facets alternating therebetween being so arranged as to present the same color as that of adjoining vehicle body panels to visually merge the lamp assembly with the coloration of the body panels and present a continuous appearance while the lamp assembly is not energized. At the same time it permits the lamp assembly to be seen as needed when it is energized. Optical surfaces are provided which establish a desired light distribution pattern which may be other than diffusion beyond a light ray focal point.

Abstract: A lamp combination wherein the reflector's reflective surface is of a shape specifically designed to compensate for the refractive effects produced by the thickness of the glass walls of the light source's envelope structure located within (surrounded by) the reflector. Optimum light output is thus assured. A method of making such a lamp is also disclosed.

Abstract: A lighting unit for liquids comprises a tubular member with a flange at one end and a screwthread at the other whereby it can be secured in the wall of a vessel to hold liquid. A holder engaged in the rear end of the tubular member holds a bulb such as an automobile head lamp bulb, and a lens is mounted in a recess in the front end of the tubular member. The lens has a convex front face, a concave rear face and a negative focal length and, with the light mounted close to the rear of the lens, gives a very wide angle of illumination. The angle may for example be 172.degree. and the tubular member may be of only 7 cm diameter.

Abstract: A high efficiency light collection system for a projector such as a light valve projector provides constant tangential magnification for all zones so that the images of the source just fills the pupil of the projection system thereby giving the best source utilization in all zones. The light collection system comprises a reflector (60) behind the source and a correcting refractor (61) in front of the source. The preferred embodiment uses an aconic reflector having continuously changing zonal focus with a single asphere corrector lens that has exactly compensating zonal focus characteristics. It is also possible to use a conic reflector, but this requires two asphere corrector lenses in order to provide the constant tangential magnification characteristics.

Abstract: An electric light has a casing with a depth that is less than half as great as its width. This is rendered possible by the use of a compact, precision reflector which permits a focused, parallel-directed beam despite the configuration of the casing.

Abstract: A reflector for an electric light has a first reflector member with a socket for the light bulb and a second reflector member positioned generally forward of the socket. In one aspect of the invention a first angular segment of the first reflector defines curved reflector means for reflecting light from the light in the socket into a collimated beam. The remaining angular segment of the first reflector defines a transversely directed, curved reflector for focusing light from the light bulb back to the filament in the light bulb to increase the filament temperature. In another aspect of the invention, the first, angular segment of the second reflector member defines a transparent partition, with the partition carrying a plurality of transparent ridges of triangular cross section. The ridges are circumferentially disposed at different radii about an extension of the central axis of the socket. Thus light from the light bulb in the socket is diffracted by the ridges into the collimated beam.

Abstract: A low profile lamp assembly for back lighting a translucent chip used as an indicator. The lamp assembly includes an incandescent bulb mounted between the translucent chip and a reflector. The reflector comprises a cavity having a parabolic internal surface truncated by a flat circular metalized diffraction grating.

Abstract: A panoramic light emitter of an omnidirectional horizontal light beam with very sharp cut-off in the vertical plane is disclosed. The sharp cut-off prevents interference near airports. High average powers are attainable because the light source can be distributed rather than be a point source. The omnidirectional-in-the-horizontal-plane light emitter with a high degree of vertical beam control is achieved by combining a generally cylindrical refractor with an internally emitting open-ended generally conical light source. The internal emitting surface of the conical light source is in the focal plane of the cylindrical refractor. The refractor sharply images the source with its edges, and that image is projected panoramically as the light beam having sharp cut-off at the edges of the image. The external surface of the conical light source does not emit, thus preventing undesired angles of light from passing out through the refractor.

Abstract: According to the invention clear and yellow transparent zones are provided on the surface of a light diffusing element associated with a headlamp for a moving vehicle. The light emitted from the lamp has the characteristics of both white and yellow light. High intensity white light provides satisfactory illumination for highway driving, while the yellow light emitted penetrates fog, dust and/or smoke better than the ordinary white light. The benefits of both light are realized with a single lamp. The coloration of the light diffusing member can be accomplished by treating a conventional white light headlamp.

Abstract: A modulated optical radiation beacon, e.g. a flashing light beacon or an IR emmissive missile jamming source, can comprise a radiation source and two relatively movable apertured masks which, as the apertures thereof move into and out of registration, pass or block the radiation from the source. Herein, to improve the uniformity of the polar distribution of the emitted radiation (assuming, of course, that a uniform distribution is required) or, in other cases, simply to improve efficiency, the apertures of the `inner` mask, i.e. the one nearest the source, are bounded by curved reflective surfaces defining an optical cavity which at least crudely images the source at a position near the outer mask. Advantageously, the optical cavities are defined by a spaced array of prismatic members having appropriately curved facing surfaces.

Abstract: The degree of diffusion of a light source can be varied by surrounding the light source with a liquid crystal cell. The light source is positioned at the focal point of a reflector and the liquid crystal cell surrounds the light source. When the cell is unexcited, the light rays which emanate from the source are virtually unaffected as they pass through the cell striking the wall of the reflector. In this state the light rays are projected nearly straight out of the reflector, providing illumination for objects at great distances from the source. When the cell is excited, scattering occurs and the light rays are diffused as they are re-emitted from the liquid crystal. The diffusion shifts the apparent light source points away from the focal point. This diffusing effect causes the light which is projected from the reflector to illuminate a wide area in close proximity to the lamp.

Abstract: A lighting system for a motor vehicle including a plurality of replaceable, sealed lighting modules and means for mounting the modules in the vehicle in a pair of spaced-apart linear, horizontally disposed arrays. Each array possesses a maximum height of only about two inches and a width greater than the array height. All of the modules are similar and each includes a reflector with a lighting capsule mounted therein. The front of the module is enclosed by means of a optically clear cover exclusive of lens elements. A lens means is separately mounted in front of each array of lighting modules for controlling the light emitted therefrom to in turn provide both high and low beam patterns for the vehicle. Each of the arrays comprises four similar modules, resulting in a system containing a total of eight such components.

Abstract: A headlamp for an automobile, capable of emitting a beam of light with a cut-off comprising an elliptical reflector having two focii, a light source at the first focus of the reflector, and a convergent lens located opposite the reflector with respect to the second focus. The lens and the reflector have a common optical axis and the focus of the lens is at the second focus of the reflector. A screen is located at the common focus having an edge close to the optical axis in order to define the cut-off beam. Localized deflector elements are provided at the upper part and the lower part of the lens to produce a lateral dispersion and/or a lowering of the light passing through these parts of the lens in order to reduce the effects of the chromatic aberrations in the vicinity of the cut-off.

Abstract: A light radiation device for trapping fish, comprising a light source, a reflecting mirror for reflecting the light from the light source so as to change it to parallel light, a lens system for focusing the parallel light from the reflecting mirror, and an optical cable into which the light focused by the lens system is introduced at one end thereof. The optical cable is provided at the other end thereof with a light leakage portion or a light radiator, which radiates the light onto or into the sea so as to attract the fish.

Abstract: An electric lamp assembly comprises a lamp unit of generally conventional design, and a base subassembly coupled thereto both mechanically and electrically. The lamp unit may take the form of a halogen cycle lamp of the baseless type terminating in a pinch seal, with lead support wires extending outwardly therefrom. The base subassembly includes a metal made, dislike lamp holder apertured for the passage of the lamp unit seal therethrough and firmly engaging the same for holding the lamp unit. The lamp holder further engages one end of a metal made, tubular coupling, the other end of which is received with a sliding fit in one end of a substantially tubular base unit molded of plastics material. Extending through the coupling, the lead support wires are electrically and mechanically coupled as by welding to connectors mounted to a partition within the base unit. The plastic base unit is easier and less expensive to fabricate to close dimensionsal tolerances than the conventional metal base.

Abstract: The lighting panel has a first face for receiving light from a source and a second face. The panel includes a first and a second sheet of transparent dielectric material. Each sheet has a smooth surface on one side and is corrugated on the other side. The surfaces forming the corrugations intersect at 90.degree. the smooth surface on the first side is at 45.degree. to the surfaces of the corrugations on the other side of each sheet. The smooth surface of the first sheet forms the first face of the panel, the corrugated surface of the first sheet is adjacent to the smooth surface of the second sheet, with the direction of the corrugations on the second sheet set at a predetermined angle .alpha. to the direction of the corrugations on the first sheet. Light thus enters the smooth surface of the first sheet and emerges from the corrugated surface of the second sheet. The sheets may be substantially planar. At least one of the sheets may also include light release mechanisms. The angle .alpha.

Abstract: A combined lighting system for a building interior includes a stack of luminescent solar concentrators (LSC), an optical conduit made of preferably optical fibers for transmitting daylight from the LSC stack, a collimating lens set at an angle, a fixture for receiving the daylight at one end and for distributing the daylight as illumination inside the building, an artificial light source at the other end of the fixture for directing artifical light into the fixture for distribution as illumination inside the building, an automatic dimmer/brightener for the artificial light source, and a daylight sensor positioned near to the LSC stack for controlling the automatic dimmer/brightener in response to the daylight sensed. The system also has a reflector positioned behind the artificial light source and a fan for exhausting heated air out of the fixture during summer and for forcing heated air into the fixture for passage into the building interior during winter.

Abstract: A probe for inspecting the inner surface of a tube is disclosed. The probe (10) utilizes a group of large diameter optical fibers (12) as a light source and an annular ring (14) of smaller diameter optical fibers as interceptors of the reflected light. A pair of plano-convex lenses (16) focuses the light beam emanating from the group of large diameter optical fibers (12) onto a reflective ball bearing (18) or a concave cone (32) causing a circumferential band (44) to be illuminated on the inner surface of the tube. Light from the band (44) is intercepted by the optical fibers within the annular ring (14) and is transmitted therethrough. The transfer of light from the band (44) to the annular ring (14) is optimized by beveling the end of the optical fibers within the annular ring (14).

Abstract: A lighting fixture utilizing a spatially fixed light source and a multi-layered hologram as a lens element. The hologram receives light from the source and directs it to a task area. The layers of the lens element are responsive to light of one or more wavelengths of interest and varying angles of incident radiation so as to diffract light from the source toward the task area.

Abstract: To permit sufficient illumination for a plastic-sealed general purpose lamp, a bulb is encased in plastic and sealed, with the plastic shell of the lamp having wide parallel faces, one of which may include a reflector to focus light. The lamps may be battery or AC controlled and have a handle for holding them and a magnet mounted in them for mounting to a surface magnetically. To control the intensity and location of the light flux emitted from the lamp, a plastic lens and reflector may be incorporated in the lamp with the inner light bulb between the two. For greater power dissipation, dead space of approximately two cubic inches is placed around the lamp in some embodiments.

Abstract: An improved optical focusing system is provided which includes a parabolic reflector and a fresnel lens situated with respect to one another to share a common focus point. The improved system is designed to collimate substantially all of the available light emitted from a light source located at the common focus point and project the light along a projecting axis. Depending on the limitations placed upon the size of the parabolic reflector, a retroreflector situated about the periphery of the fresnel lens can be added to the system to maximize the amount of emitted light which the system can process and collimate.

Abstract: Apparatus for producing a line source of a desired shape from a light source such as an excimer laser comprising means for directing the light source along a predetermined path to a cylindrical lens positioned to produce a virtual line image having uniform intensity along its length at a first location. However, the image is intercepted by a cylindrical mirror inclined at an angle so that the beam is transformed into a curved shape and directed onto a quartz diffuser. This apparatus produces a curved self-luminous distribution having uniform intensity over its length. In a specific embodiment, the diffuser is a directional diffuser.

Abstract: An elevated airport runway, taxiway, or threshold edge light with a glass dome that is so positioned with respect to the light source so as to correct for variations in thickness of the base of the glass dome as the result of the glass-making process. The glass dome is sealed into an overhanging cover which preserves the integrity of the interior of the light against adverse weather conditions and the support base on which the cover is positioned is provided with a ball joint so as to permit quick and easy elevation and azimuth positioning of the base in the field. The base is also provided with a vertical support for a snow flag.

Abstract: The light comprises a cluster of lamp unts (100), pivotally mounted at (6,7), on respective chassis (8) running on a loop track. The lamp units are approximately equidistant from a central axis and illuminate a common patch on the axis. Each chassis (8) is connected to a respective chain (35) which may be driven to move individual chassis (8) along the track, changing the configuration of the cluster. A linkage (26,27,31) enables the lamp unit inclination to be varied and a linkage (12,13,14,16,18 ) enables the relative positions of a bulb (1) and a concave reflector (10) to vary, thereby varying the beam width. The rollers (18) of each unit roll on a surface of a first common hoop and the rollers (31) on a surface of a second common hoop. The hoops are movable enabling the inclination of beamwidth of all the lamp units to be varied simultaneously, changing the patch range or size.

Abstract: In a luminaire comprising an upper housing assembly for a light source and a lower plastic refractor closing the underside and having a rim adapted to mate with that of the assembly, C-shaped latches are disposed around the periphery of said refractor for clamping the rims together when pivoted into position astride both rims. Circumferentially extending bail wires attach the latches to the underside of the refractor rim and allow them to be pivoted into clamping position while preventing them from dropping off when disengaged. The bail wires pass through holes molded in the plastic of the refractor rim.

Abstract: A surgical headlamp is disclosed that is removably mounted to a headband and which utilizes a remote light source connected via a fiberoptic cable. The mounting arrangement includes frictional sliding members permitting adjustment of the lamp to an exact in between the eyes location.

Abstract: A device for controlling light images has a light source forming a light spot or light spot group, a reflection device positioned relative to said light source for receiving all of the light rays from the light source and reflecting the light rays, and a light direction changing surface positioned relative to the reflection device for receiving the reflected light rays from the reflection device. The reflection device has a generally planar or curved fresnel mirror type reflecting surface having thereon a plurality of minute prism-shaped elements disposed in minute parallel ridges, or a specially curved surface. The angles of the surfaces of the ridges or the curved surface causes the light to be reflected therefrom in non-parallel directions for spreading the light rays in a uniform light intensity distribution on the light direction changing surface.

Abstract: An ornamental lighting device includes a plurality of optical fibers to which condensed light from a light source is distributed through a fiber optic cable. The optical fibers are arranged parallel to each other and held between a pair of light transmitting panels, which are rigidly mounted on a pedestal. Light propagating through the optical fibers is radiated through the light transmitting panels to the ambience. A plurality of such lighting devices may be arranged side by side and supplied by a common light source.

Abstract: A vehicle headlamp comprises a reflector having a reflecting parabolic face, and a lens made of synthetic resin and attached to the front end of said reflector. The vehicle headlamp further includes a lamp held by said reflector, at least one filament in said lamp positioned ahead the focussing point of said reflector, and a zone formed on the reflecting face where a means is arranged to reduce the amount of light coming from the filament onto the lens at an upper area thereof, said zone being positioned above the lamp and along an axis vertically passing through an optical axis. Said light reducing means is intended to reflect light either irregularly or diffusedly. The irregularly reflecting means comprises using no undercoat which serves to make the reflecting coat flat and smooth, or making the reflector body rough and uneven and then applying reflecting coat onto this rough and uneven portion with the undercoat interposed therebetween.

Abstract: A submersible lamp having a standardized air impervious housing with a lens formed therein in optical alignment with a bulb carried within the housing. The housing defines a predetermined quantity of air and has an opening at the lower end thereof such that upon submersion in water a limited amount of water is allowed to enter the housing, trapping the air within the housing and preventing the water from rising above a predetermined level. A channel is formed on the rear wall of the lamp housing to receive a bulb and bulb socket support bracket for the selective mounting and positioning of the bulb within the housing in accordance with the function which the lamp is to perform.

Abstract: An illuminating apparatus is provided with an illuminating unit for forming a plurality of secondary light sources, the illuminating unit having a light source, a light converging device for converging photoenergy emitted from the light source, and a first multi-beam forming optical element for forming multiple light beams. A second multi-beam forming optical element produces a uniform luminance distribution and forms multiple light beams. A first converging optical system converges the photoenergy emitted from the first multi-beam forming optical element on the second multi-beam forming optical element, and a second converging optical system converges the photoenergy emitted from the second multi-beam forming optical element on a photomask.

Abstract: A reflector lamp having multiple and aimed parabolic reflective sections so as to improve the desired beam pattern is disclosed. The reflector lamp may be of the parabolic aluminized reflector (PAR) or the reflector (R) type lamps having primary, multiple intermediate and rear sections of a parabolic contour which improves the internal light reflective and absorption characteristics of the reflector lamp. The overall effect is to improve the optical efficacy of the reflector lamp.

Abstract: A static-type of multi-color searchlight signal for displaying one of a plurality of color signals including a plurality of parabolic reflectors, each having a focal point at which an associated "white light" source is located so that light rays are collected and reflected in a substantially parallel configuration, a plurality of color filters, one of which is disposed in front of each one of the plurality of parabolic reflectors for passing a given color of the parallel light rays and for absorbing all other colors, a plurality of dichroic filters situated in the optical path of the passed parallel light rays and having an angle of incidence which corresponds to the angle of incidence of the passed parallel light rays, and a lens system for projecting the passed parallel light rays for providing a color signal aspect.

Abstract: An annular illumination device comprising a tubular light transmitter, a light source means able to project parallel light rays onto an entrance end face of the tubular light transmitter from a direction intersecting diagonally with the entrance end face and a light collecting lens collecting conical light bundle coming out of an exit end face of the tubular light transmitter to form an image of an annular light in order to make it possible to make a bright efficient annular illumination. The angle formed by the parallel light rays with the entrance end face of the tubular light transmitter can be varied in order to vary the diameter of the image of the annular light.

Abstract: An illumination element having a transparent flexible tube and a fine flexible light conducting member accommodated in the tube. The light conducting member is provided with a number of light outlet sections at spaced locations along its length. Light is incident on at least one end of the light conducting member and caused to break through the light outlet sections while propagating through the light conducting member. The light is available for ornamental lighting or the like.

Abstract: A photoflash unit employing an optical system or apparatus with improved center beam candle power seconds and zonal lumen seconds from the flash lamp therein, said unit also employing a minimized utilization ratio of lamp-to-package cross-sectional area. Each individual lamp capsule comprises a reflective element, a refractive element (lens), and at least one photoflash lamp (light source). The lens provides for lamp shred magnification so as to fill the cell (capsule) width to thus provide maximum transfer of light to the subject on axis. One embodiment has the light source fused (glued) to the reflector and lens while a second embodiment has an air interface between the source and the optical elements. In both embodiments, the lens is aspheric and substantially covers both the reflector and source.

Abstract: The present invention provides a spotlight adjusting system for controlling the beam of a spotlight. A ellipsoidal reflector-lamp assembly is movable to a plurality of positions relative to the iris. The diaphragm of the iris is independently adjustable to a plurality of positions so that the light being reflected from the focal area of the reflector assembly can be controlled between passing the full beam received at the iris to a portion of the beam received there. The rear lens is adjustable relative to the iris and the front lens. The system provides mounting structures for both a long throw and a short throw front lens so that the system can be selectively mounted with either a removable long or short focal front lens.