Patent Publication Number: US-9429296-B2

Title: Modular optic for changing light emitting surface

Description:
This application is a continuation-in-part of U.S. patent application Ser. No. 13/042,378, filed Mar. 7, 2011, which claims the benefit of U.S. provisional patent application Nos. 61/413,949 filed Nov. 15, 2010, and 61/419,415 filed Dec. 3, 2010, the disclosures of which are incorporated herein by reference in their entireties. This application is also a continuation-in-part of U.S. patent application Ser. No. 13/108,927 filed May 16, 2011, now U.S. Pat. No. 8,573,816, which claims the benefit of U.S. provisional patent application No. 61/452,671, filed Mar. 15, 2011, the disclosures of which are incorporated herein by reference in their entireties. This application is related to U.S. patent application Ser. No. 14/073,428, entitled MODULAR OPTIC FOR CHANGING LIGHT EMITTING SURFACE, concurrently filed Nov. 6, 2013, the disclosure of which is incorporated herein by reference in its entirety. 
    
    
     FIELD OF THE DISCLOSURE 
     The present disclosure relates to lighting fixtures, and in particular, to a modular optic for a lighting fixture. 
     BACKGROUND 
     In recent years, a movement has gained traction to replace incandescent light bulbs with lighting fixtures that employ more efficient lighting technologies. One such technology that shows tremendous promise employs light emitting diodes (LEDs). Compared with incandescent bulbs, LED-based lighting fixtures are much more efficient at converting electrical energy into light and are longer lasting, and as a result, lighting fixtures that employ LED technologies are expected to replace incandescent bulbs in residential, commercial, and industrial applications. 
     Further, there are innumerable types of lighting applications that require light output with different beam shapes or like output characteristics. As such, there is a need for an effective and efficient way to change or modify the beam shape of the light output of an existing lighting fixture, and in particular an LED-based lighting fixture, based on the demands of the lighting application. 
     SUMMARY 
     An LES (light emitting surface) is a surface within a lighting fixture from which light emanates. The present disclosure relates to a providing a lighting fixture that has an actual light emitting surface (A-LES), which is substantially smaller than the maximum potential LES (M-LES) for the lighting fixture. The M-LES is defined as the theoretical maximum LES for the mounting structure of the lighting fixture, and the A-LES is defined as the actual LES of the lighting fixture, as dictated by the lens or optical structures of the lighting fixture. The A-LES may provide an LES that is not only smaller, but also shaped differently, from the M-LES, to help control the light output of the lighting fixture based on the lighting application. 
     In a first embodiment, the lighting fixture includes a mounting structure, an LED light source, and an internal optic. The mounting structure has a cavity and a front opening in communication with the cavity. The front opening defines the M-LES for the lighting fixture. The internal optic includes a shroud and an optic body. The shroud covers the front opening and has a light emitting opening. The optic body extends into the cavity of the mounting structure and toward the LED light source from the light emitting opening, which defines an A-LES for the lighting fixture that is substantially less than the M-LES. 
     A lens assembly may be provided that is removably attachable to the mounting structure and configured to cover the front opening of the mounting structure. When attached to the mounting structure, the lens assembly may hold the internal optic within the cavity of the mounting structure such that internal optic is not otherwise affixed to the mounting structure. As such, the light emitting opening of the internal optic defines an actual LES on the lens assembly that is substantially less than the maximum potential LES for the lighting fixture. Further, the internal optic may be modular and readily replaced with another internal optic that has a different LES, output beam characteristic, or a combination thereof. 
     In one embodiment, the front opening of the mounting structure has a first shape, and the light emitting opening has a second shape, which is substantially different from the first shape. Further, the light emitting opening may be centered on or offset from the center of the front opening of the mounting structure. The optic body may extend from the shroud and terminate at a light receiving opening, which is configured to receive and surround the LEDs of the LED light source. 
     Depending on the needs of the lighting application, the light receiving opening may have a first shape, and the light emitting opening may have a second shape, that is substantially the same or different from the first shape. The size of the light emitting and the light receiving openings may be the same or different. Further, the optic body may take on virtually any shape, such as conical, pyramidal, rectangular, polygonal, or the like. In certain embodiments, the actual LES has an area that is less than about 70%, 50%, 30%, or 20% of an area of the maximum potential LES. 
     In one embodiment, the mounting structure includes a heat spreading cup having a bottom panel, a rim, and at least one sidewall extending between the bottom panel and the rim. The LED light source is coupled inside the heat spreading cup to the bottom panel and configured to emit light in a forward direction through the front opening, which is formed by the rim, wherein the LED light source is thermally coupled to the bottom panel such that heat generated by the light source during operation is transferred radially outward along the bottom panel and in the forward direction along the at least one sidewall toward the rim. 
     In an alternative configuration, the lens and internal optic are integrated together to form an integrated lens assembly, which attaches to the mounting structure. The integrated lens assembly includes a shroud, an optic body, and a lens. The shroud covers the front opening and has a light emitting opening. The optic body extends into the cavity toward the LED light source from the light emitting opening, which defines an actual LES that is substantially less than the maximum potential LES. The lens is mounted such that the light emitted from the LED light source must pass through the lens before exiting the integrated lens assembly. The shroud may be configured to be removably attached to the mounting structure. 
     In a first configuration, the lens is mounted in and covers the light emitting opening. The lens may be mounted such that it is flush with the front surface of the shroud. In a second configuration, the lens is recessed into and mounted to an inside portion of the optic body. The optic body may include a channel formed on the inside portion of the optic body wherein at least a portion of the lens is mounted in the channel. In a third configuration, the lens may be replaced with a total internal reflector (TIR) and mounted as noted above. 
     In still another embodiment, the lighting fixture includes a mounting structure, an LED light source, a shroud, and a lens. The mounting structure has a cavity and a front opening in communication with the cavity. The front opening defines the M-LES for the lighting fixture. The shroud covers the front opening and has a light emitting opening, which defines an actual LES that is substantially less than the maximum potential LES. The lens extends into the cavity toward the LED light source from the light emitting opening. In one configuration, the lens is substantially parabolic and has a front portion mounted on the light emitting opening and a rear portion that has an opening that receives the LED light source. 
     As with the prior embodiments, the light receiving opening may have a first shape, and the light emitting opening may have a second shape, that is substantially the same or different from the first shape. The size of the light emitting and the light receiving openings may be the same or different. Further, the optic body may take on virtually any shape, such as conical, pyramidal, rectangular, polygonal, or the like. In certain embodiments, the actual LES has an area that is less than about 70%, 50%, 30%, or 20% of an area of the maximum potential LES. 
     Those skilled in the art will appreciate the scope of the disclosure and realize additional aspects thereof after reading the following detailed description in association with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings incorporated in and forming a part of this specification illustrate several aspects of the disclosure, and together with the description serve to explain the principles of the disclosure. 
         FIG. 1  is an isometric view of the front of the lighting fixture according to one embodiment of the disclosure. 
         FIG. 2  is an isometric view of the back of the lighting fixture of  FIG. 1 . 
         FIG. 3  is an exploded isometric view of the lighting fixture of  FIG. 1 . 
         FIG. 4  is an isometric view of the front of the lighting fixture of  FIG. 1  without the lens assembly, diffuser, and internal optic. 
         FIG. 5  is an isometric view of the front of the lighting fixture of  FIG. 1  without the lens assembly and diffuser. 
         FIG. 6A  is an isometric view of the front of the lighting fixture of  FIG. 1  with the lens assembly. 
         FIG. 6B  is a cross sectional view of the lighting fixture of  FIG. 5 . 
         FIG. 7  is an isometric view of the front of a lighting fixture without the lens assembly and with an internal optic, according to one embodiment of the disclosure. 
         FIGS. 8A-8D  are respective front isometric, rear isometric, side plan, and cross-sectional views of the internal optic of  FIG. 7 . 
         FIGS. 8E and 8F  are front isometric and rear isometric views of the internal optic of  FIG. 7  recessed in the rear of the lens assembly. 
         FIG. 9A  is a front isometric view of the lighting fixture wherein the A-LES is illustrated when using the internal optic of  FIG. 7 . 
         FIG. 9B  is a cross-sectional view of the lighting fixture of  FIG. 7 . 
         FIG. 9C  is a cross-sectional view of a lighting fixture with an integrated lens assembly according to one embodiment of the disclosure. 
         FIG. 9D  is a front isometric view of the lighting fixture wherein the lens and the corresponding A-LES are illustrated when the using the integrated lens assembly of  FIG. 9C . 
         FIGS. 10A-10G  are respective front isometric, rear isometric, rear plan, front plan, first side plan, second side plan, and cross-sectional views of the integrated lens assembly of  FIG. 9C . 
         FIG. 11  is an isometric view of the front of lighting fixture without the lens assembly and with an internal optic, according to one embodiment of the disclosure. 
         FIGS. 12A-12L  are respective front isometric, rear isometric, front plan, rear plan, first side plan, second side plan, and six cross-sectional views of the internal optic of  FIG. 11 . 
         FIG. 13  is a front isometric view of the lighting fixture wherein the A-LES is illustrated when using the internal optic of  FIG. 11 . 
         FIGS. 14A-14F  are respective front isometric, rear isometric, front plan, rear plan, first side plan, and second side plan views of another embodiment of the internal optic. 
         FIGS. 15A-15F  are respective front isometric, rear isometric, front plan, rear plan, first side plan, and second side plan views of another embodiment of the internal optic. 
         FIGS. 16A-16F  are respective front isometric, rear isometric, front plan, rear plan, first side plan, and second side plan views of another embodiment of the internal optic. 
         FIGS. 16G and 16H  are front isometric and rear isometric views of the internal optic of  FIGS. 16A-16F  recessed in the rear of the lens assembly. 
         FIGS. 17A-17E  are respective front isometric, rear isometric, front plan, rear plan, and side plan views of another embodiment of the internal optic. 
         FIGS. 17F and 17G  are front isometric and rear isometric views of the internal optic of  FIGS. 17A-17E  recessed in the rear of the lens assembly. 
         FIGS. 18A-18E  are respective front isometric, rear isometric, front plan, rear plan, and side plan views of another embodiment of the internal optic. 
         FIGS. 18F and 18G  are front isometric and rear isometric views of the internal optic of  FIGS. 18A-18E  recessed in the rear of the lens assembly. 
         FIGS. 19A-19E  are respective front isometric, rear isometric, rear plan, side plan, and cross-sectional views of an integrated lens assembly with a TIR. 
         FIGS. 20A-20F  are respective front isometric, rear isometric, front plan, rear plan, first side plan, and second side plan views of another embodiment of the internal optic. 
         FIGS. 21A-21F  are respective front isometric, rear isometric, front plan, rear plan, first side plan, and second side plan views of another embodiment of the internal optic. 
         FIG. 22  is a lighting fixture with an external reflector according to one embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     The embodiments set forth below represent the necessary information to enable those skilled in the art to practice the disclosure and illustrate the best mode of practicing the disclosure. Upon reading the following description in light of the accompanying drawings, those skilled in the art will understand the concepts of the disclosure and will recognize applications of these concepts not particularly addressed herein. It should be understood that these concepts and applications fall within the scope of the disclosure. 
     It will be understood that relative terms such as “front,” “forward,” “rear,” “below,” “above,” “upper,” “lower,” “horizontal,” or “vertical” may be used herein to describe a relationship of one element, layer or region to another element, layer or region as illustrated in the figures. It will be understood that these terms are intended to encompass different orientations of the device in addition to the orientation depicted in the figures. 
     An LES (light emitting surface) is a surface within a lighting fixture from which light emanates. The present disclosure relates to a providing a lighting fixture that has an actual light emitting surface (A-LES), which is substantially smaller than the maximum potential LES (M-LES) for the lighting fixture. The M-LES is defined as the theoretical maximum LES for the mounting structure of the lighting fixture, and the A-LES is defined as the actual LES of the lighting fixture, as dictated by the lens or optical structures of the lighting fixture. The A-LES may provide an LES that is not only smaller, but also shaped differently, from the M-LES, to help control the light output of the lighting fixture based on the lighting application. 
     In a first embodiment, the lighting fixture includes a mounting structure, an LED light source, and an internal optic. The mounting structure has a cavity and a front opening in communication with the cavity. The front opening defines the M-LES for the lighting fixture. The internal optic includes a shroud and an optic body. The shroud covers the front opening and has a light emitting opening. The optic body extends into the cavity of the mounting structure and toward the LED light source from the light emitting opening, which defines an A-LES for the lighting fixture that is substantially less than the M-LES. 
     A lens assembly may be provided that is removably attachable to the mounting structure and configured to cover the front opening of the mounting structure. When attached to the mounting structure, the lens assembly holds the internal optic within the cavity of the mounting structure such that internal optic is not otherwise affixed to the mounting structure. As such, the light emitting opening of the internal optic defines an actual LES on the lens assembly that is substantially less than the maximum potential LES for the lighting fixture. Further, the internal optic is modular and can be readily replaced with another internal optic that has a different LES, output beam characteristic, or a combination thereof. 
     In one embodiment, the front opening of the mounting structure has a first shape, and the light emitting opening has a second shape, which is substantially different from the first shape. Further, the light emitting opening may be centered on or offset from the center of the front opening of the mounting structure. The optic body may extend from the shroud and terminate at a light receiving opening, which is configured to receive and surround the LEDs of the LED light source. 
     Depending on the needs of the lighting application, the light receiving opening may have a first shape, and the light emitting opening may have a second shape, that is substantially the same or different from the first shape. The size of the light emitting and the light receiving openings may be the same or different. Further, the optic body may take on virtually any shape, such as conical, pyramidal, rectangular, polygonal, or the like. In certain embodiments, the actual LES has an area that is less than about 70%, 50%, 30%, or 20% of an area of the maximum potential LES. 
     In an alternative configuration, the lens and internal optic are integrated together to form an integrated lens assembly, which attaches to the mounting structure. The integrated lens assembly includes a shroud, an optic body, and a lens. The shroud covers the front opening and has a light emitting opening. The optic body extends into the cavity toward the LED light source from the light emitting opening, which defines an actual LES that is substantially less than the maximum potential LES. The lens is mounted such that the light emitted from the LED light source must pass through the lens before exiting the integrated lens assembly. The shroud may be configured to be removably attached to the mounting structure. 
     In a first configuration, the lens is mounted in and covers the light emitting opening. The lens may be mounted such that it is flush with the front surface of the shroud. In a second configuration, the lens is recessed into and mounted to an inside portion of the optic body. The optic body may include a channel formed on the inside portion of the optic body wherein at least a portion of the lens is mounted in the channel. In a third configuration, the lens may be replaced with a total internal reflector (TIR) and mounted as noted above. 
     In still another embodiment, the lighting fixture includes a mounting structure, an LED light source, a shroud, and a lens. The mounting structure has a cavity and a front opening in communication with the cavity. The front opening defines the M-LES for the lighting fixture. The shroud covers the front opening and has a light emitting opening, which defines an actual LES that is substantially less than the maximum potential LES. The lens extends into the cavity toward the LED light source from the light emitting opening. In one configuration, the lens is substantially parabolic and has a front portion mounted on the light emitting opening and a rear portion that has an opening that receives the LED light source. Prior to delving into the details of these embodiments, an overview of an exemplary lighting fixture is provided in which the concepts of the disclosure may be implemented. 
       FIGS. 1 and 2  illustrate a state-of-the-art lighting fixture  10 , which is similar to the LMR2 and LMH2 series of lighting fixtures manufactured by Cree Inc. of Durham, N.C. Further details regarding this particular lighting fixture may be found in co-assigned U.S. patent application Ser. No. 13/042,378, which was filed Mar. 7, 2011, and entitled LIGHTING FIXTURE, the disclosure of which is incorporated herein by reference in its entirety. While this particular lighting fixture  10  is used for reference, those skilled in the art will recognize that virtually any type of solid-state lighting fixture may benefit from the concepts of this disclosure. 
     As shown, the lighting fixture  10  includes a control module  12 , a mounting structure  14 , and a lens assembly  16 . The illustrated mounting structure  14  is cup-shaped and is capable of acting as a heat spreading device; however, different fixtures may include different mounting structures  14  that may or may not act as heat spreading devices. A light source (not shown), which will be described in detail further below, is mounted inside the mounting structure  14  and oriented such that light is emitted from the mounting structure through the lens assembly  16 . The electronics (not shown) that are required to power and drive the light source are provided, at least in part, by the control module  12 . While the lighting fixture  10  is envisioned to be used predominantly in 4, 5, and 6 inch recessed lighting applications for industrial, commercial, and residential applications, those skilled in the art will recognize the concepts disclosed herein are applicable to virtually any size or shape of lighting fixture. 
     The lens assembly  16  may include one or more lenses that are made of clear or transparent materials, such as polycarbonate or acrylic glass or any other suitable material. As discussed further below, the lens assembly  16  may be associated with a diffuser for diffusing the light emanating from the light source and exiting the mounting structure  14  via the lens assembly  16 . Further, the lens assembly  16  may also be configured to help shape or direct the light exiting the mounting structure  14  via the lens assembly  16  in a desired manner. 
     The control module  12  and the mounting structure  14  may be integrated and provided by a single structure. Alternatively, the control module  12  and the mounting structure  14  may be modular wherein different sizes, shapes, and types of control modules  12  may be attached, or otherwise connected, to the mounting structure  14  and used to drive the light source provided therein. 
     In the illustrated embodiment, the mounting structure  14  is cup-shaped and includes a cylindrical sidewall  18  that extends between a bottom panel  20  at the rear of the mounting structure  14 , and a rim, which may be provided by an annular flange  22  at the front of the mounting structure  14 . One or more elongated slots  24  may be formed in the outside surface of the sidewall  18 . 
     There are two elongated slots  24 , which extend parallel to a central axis of the lighting fixture  10  from the rear surface of the bottom panel  20  toward, but not completely to, the annular flange  22 . The elongated slots  24  may be used for a variety of purposes, such as providing a channel for a grounding wire that is connected to the mounting structure  14  inside the elongated slot  24 ; connecting additional elements, such as heat sinks or external reflectors, to the lighting fixture  10 ; or as described further below, securely attaching the lens assembly  16  to the mounting structure  14 . 
     The annular flange  22  may include one or more mounting recesses  26  in which mounting holes are provided. The mounting holes may be used for mounting the lighting fixture  10  to a mounting structure or for mounting accessories to the lighting fixture  10 . The mounting recesses  26  provide for counter-sinking the heads of bolts, screws, or other attachment means below or into the front surface of the annular flange  22 . 
     With reference to  FIG. 3 , an exploded view of the lighting fixture  10  of  FIGS. 1 and 2  is provided. As illustrated, the control module  12  includes control module electronics  28 , which are encapsulated by a control module housing  30  and a control module cover  32 . The control module housing  30  is cup-shaped and sized sufficiently to receive the control module electronics  28 . The control module cover  32  provides a cover that extends substantially over the opening of the control module housing  30 . Once the control module cover  32  is in place, the control module electronics  28  are contained within the control module housing  30  and the control module cover  32 . The control module  12  is, in the illustrated embodiment, mounted to the rear surface of the bottom panel  20  of the mounting structure  14 . 
     The control module electronics  28  may be used to provide all or a portion of power and control signals necessary to power and control the light source  34 , which may be mounted on the front surface of the bottom panel  20  of the mounting structure  14  as shown, or in an aperture provided in the bottom panel  20  (not shown). Aligned holes or openings in the bottom panel  20  of the mounting structure  14  and the control module cover  32  are provided to facilitate an electrical connection between the control module electronics  28  and the light source  34 . In an alternative embodiment (not shown), the control module  12  may provide a threaded base that is configured to screw into a conventional light socket wherein the lighting fixture resembles or is at least a compatible replacement for a conventional light bulb. Power to the lighting fixture  10  would be provided via this base. 
     In the illustrated embodiment, the light source  34  is solid state and employs one or more light emitting diodes (LEDs) and associated electronics, which are mounted to a printed circuit board (PCB) to generate light at a desired intensity and color temperature. The LEDs are mounted on the front side of the PCB while the rear side of the PCB is mounted to the front surface of the bottom panel  20  of the mounting structure  14  directly or via a thermally conductive pad (not shown). In this embodiment, the thermally conductive pad has a low thermal resistivity, and therefore, efficiently transfers heat that is generated by the light source  34  to the bottom panel  20  of the mounting structure  14 . 
     While various mounting mechanisms are available, the illustrated embodiment employs four bolts  44  to attach the PCB of the light source  34  to the front surface of the bottom panel  20  of the mounting structure  14 . The bolts  44  screw into threaded holes provided in the front surface of the bottom panel  20  of the mounting structure  14 . Three bolts  46  are used to attach the mounting structure  14  to the control module  12 . In this particular configuration, the bolts  46  extend through corresponding holes provided in the mounting structure  14  and the control module cover  32  and screw into threaded apertures (not shown) provided just inside the rim of the control module housing  30 . As such, the bolts  46  effectively sandwich the control module cover  32  between the mounting structure  14  and the control module housing  30 . 
     An internal optic  36  resides within the interior chamber provided by the mounting structure  14 . In the illustrated embodiment, the internal optic  36  is essentially a reflector cone that has a conical wall that extends between a larger front opening and a smaller rear opening. The front opening is generally referred to the light emitting opening  36 E of the internal optic  36 , and the rear opening is referred to as the light receiving opening  36 R. The light emitting opening  36 E resides at and substantially corresponds to the dimensions of front opening in the mounting structure  14  that corresponds to the front of the interior chamber, or cavity, provided by the mounting structure  14 . The light receiving opening  36 R of the internal optic  36  resides about and substantially corresponds to the size of the LED or array of LEDs provided by the light source  34 . The front surface of the internal optic  36  is generally, but not necessarily, highly reflective in an effort to increase the overall efficiency and optical performance of the lighting fixture  10 . In certain embodiments, the internal optic  36  is formed from metal, paper, a polymer, or a combination thereof. In essence, the internal optic  36  provides a mixing chamber for light emitted from the light source  34  and may be used to help direct or control how the light exits the mixing chamber through the lens assembly  16 . 
     When assembled, the lens assembly  16  is mounted on or over the annular flange  22  and may be used to hold the internal optic  36  in place within the interior chamber of the mounting structure  14  as well as hold additional lenses and one or more planar diffusers  38  in place. In the illustrated embodiment, the lens assembly  16 , the diffuser  38 , and the light emitting opening  36 E generally correspond in shape and size to the front opening of the mounting structure  14 . The lens assembly  16  may be mounted such that the front surface of the lens assembly  16  is substantially flush with the front surface of the annular flange  22 . As shown in  FIGS. 4 and 5 , a recess  48  is provided on the interior surface of the sidewall  18  and substantially around the opening of the mounting structure  14 . The recess  48  provides a ledge on which the diffuser  38 , the lens assembly  16 , and perhaps an outer portion of the internal optic  36  rest inside the mounting structure  14 . The recess  48  may be sufficiently deep such that the front surface of the lens assembly  16  is flush with the front surface of the annular flange  22 . 
     Returning to  FIG. 3 , the lens assembly  16  may include tabs  40 , which extend rearward from the outer periphery of the lens assembly  16 . The tabs  40  may slide into corresponding channels on the interior surface of the sidewall  18  (see  FIG. 4 ). The channels are aligned with corresponding elongated slots  24  on the exterior of the sidewall  18 . The tabs  40  have threaded holes that align with holes provided in the grooves and elongated slots  24 . When the lens assembly  16  resides in the recess  48  at the front opening of the mounting structure  14 , the holes in the tabs  40  will align with the holes in the elongated slots  24 . Bolts  42  may be inserted through the holes in the elongated slots and screwed into the threaded holes provided in the tabs  40  to affix the lens assembly  16  to the mounting structure  14 . When the lens assembly  16  is secured, the diffuser  38  is sandwiched between the lens assembly and the recess  48 , and the internal optic  36  is contained between the diffuser  38  and the light source  34 . If the diffuser  38  is not used or is integrated with the lens assembly  16 , the internal optic  36  is contained between the lens assembly  16  and the light source  34 . Alternatively, a retention ring (not shown) may attach to the flange  22  of the mounting structure  14  and operate to hold the lens assembly  16  and diffuser  38  in place. 
     The degree and type of diffusion provided by the diffuser  38  may vary from one embodiment to another. Further, color, translucency, or opaqueness of the diffuser  38  may vary from one embodiment to another. Separate diffusers  38 , such as that illustrated in  FIG. 3 , are typically formed from a polymer, glass, or thermoplastic, but other materials are viable and will be appreciated by those skilled in the art. Similarly, the lens assembly  16  is planar and generally corresponds to the shape and size of the diffuser  38  as well as the front opening of the mounting structure  14 . As with the diffuser  38 , the material, color, translucency, or opaqueness of the lens assembly  16  may vary from one embodiment to another. Further, both the diffuser  38  and the lens assembly  16  may be formed from one or more materials or one or more layers of the same or different materials. While only one diffuser  38  and one lens assembly  16  are depicted, the lighting fixture  10  may have multiple diffusers  38  or lens assemblies  16 . 
     For LED-based applications, the light source  34  provides a single LED or an array of LEDs  50 , as illustrated in  FIG. 4 .  FIG. 4  illustrates a front isometric view of the lighting fixture  10 , with the lens assembly  16 , diffuser  38 , and internal optic  36  removed, such that the light source  34  and the array of LEDs  50  are clearly visible within the mounting structure  14 .  FIG. 5  illustrates a front isometric view of the lighting fixture  10  with the lens assembly  16  and diffuser  38  removed and the internal optic  36  in place, such the array of LEDs  50  of the light source  34  are aligned with the light receiving opening  36 R of the internal optic  36 . As noted above, the volume inside the internal optic  36  and bounded by the light receiving opening  36 R of the internal optic  36  and the lens assembly  16  or diffuser  38  provides a mixing chamber.  FIG. 6A  illustrates a front isometric view of the lighting fixture  10  with the lens assembly  16  in place.  FIG. 6B  illustrates a cross-section of the lighting fixture  10 . 
     Light emitted from the array of LEDs  50  is mixed inside the mixing chamber formed by the internal optic  36  (not shown) and directed out through the lens assembly  16  in a forward direction to form a light beam. The array of LEDs  50  of the light source  34  may include LEDs  50  that emit different colors of light. For example, the array of LEDs  50  may include both red LEDs that emit red light and blue-shifted yellow (BSY) LEDs that emit bluish-yellow light, wherein the red and bluish- yellow light is mixed to form “white” light at a desired color temperature. For additional information, reference is made to co-assigned U.S. Pat. No. 7,213,940, which is incorporated herein by reference in its entirety. For a uniformly colored light beam, relatively thorough mixing of the light emitted from the array of LEDs  50  is desired. Both the internal optic  36  and the diffusion provided by the diffuser  38  may play a significant role in mixing the light emanated from the array of LEDs  50  of the light source  34 . 
     In particular, certain light rays, which are referred to as non-reflected light rays, emanate from the array of LEDs  50  and exit the mixing chamber through the diffuser  38  and lens assembly  16  without being reflected off of the interior surface of the internal optic  36 . Other light rays, which are referred to as reflected light rays, emanate from the array of LEDs of the light source  34  and are reflected off of the front surface of the internal optic  36  one or more times before exiting the mixing chamber through the diffuser  38  and lens assembly  16 . 
     With these reflections, the reflected light rays are effectively mixed with each other and at least some of the non-reflected light rays within the mixing chamber before exiting the mixing chamber through the diffuser  38  and the lens assembly  16 . 
     As noted above, the diffuser  38  functions to diffuse, and as result mix, the non-reflected and reflected light rays as they exit the mixing chamber, wherein the mixing chamber and the diffuser  38  provide the desired mixing of the light emanated from the array of LEDs  50  of the light source  34  to provide a light beam of a consistent color. In addition to mixing light rays, the lens assembly  16  and diffuser  38  may be designed and the internal optic  36  shaped in a manner to control the relative concentration and shape of the resulting light beam that is projected from the lighting fixture  10 . For example, a first lighting fixture  10  may be designed to provide a concentrated beam for a spotlight, wherein another may be designed to provide a widely dispersed beam for a floodlight. From an aesthetics perspective, the diffusion provided by the diffuser  38  also prevents the emitted light from looking pixelated and obstructs the ability for a user to see the individual LEDs of the array of LEDs  50 . 
     As provided in the above embodiment, the more traditional approach to diffusion is to provide a diffuser  38  that is separate from the lens assembly  16 . As such, the lens assembly  16  is effectively transparent and does not add any intentional diffusion. The intentional diffusion is provided by the diffuser  38 . In most instances, the diffuser  38  and lens assembly  16  are positioned next to one another. In an effort to minimize part counts and ease manufacturing complexity, a diffusion film may be applied directly on one or both surfaces of the lens assembly  16 . Alternatively, the lens assembly  16  may be configured to provide the functions of both a traditional lens assembly  16  and either a diffuser  38  or diffusion film  38 F. Details are provided in U.S. Pat. Nos. 9,371,966 and 8,573,816, which are incorporated herein by reference. 
     As noted above, a light emitting surface (LES) is a surface area within a lighting fixture  10  from which light emanates. For the purposes of this disclosure and the accompanying claims, the terms maximum potential LES (M-LES) and actual LES (A-LES) are defined as follows. The M-LES is defined as the theoretical maximum LES for the mounting structure  14  of the lighting fixture  10 . The M-LES essentially corresponds to the front opening of the mounting structure  14 . The A-LES is defined as the actual LES of the lighting fixture  10 , as dictated by the lens assembly  16 , internal optic  36 , or the like. The A-LES may be substantially less than the M-LES for the mounting structure  14  of the lighting fixture  10 . In respective embodiments, the A-LES has an area that is less than about 70%, 50%, 30%, or 20% of an area of the M-LES. 
     As described further below, the A-LES may provide a surface that is not only smaller, but also shaped differently, from the M-LES, to help control the light output of the lighting fixture. Each lighting fixture  10  will generally have an A-LES and be associated with a theoretical M-LES. Actual light output is controlled by the A-LES, and the M-LES is simply a reference to help define the inventive concepts disclosed herein. 
     With reference to  FIGS. 6A and 6B , the front opening of the mounting structure  14  corresponds to the front surface of the lens assembly  16 . Since the light emitting opening  36 E of the internal optic  36  generally corresponds to both the front opening of the mounting structure  14  and the lens assembly  16 , light will emanate through the entirety of the front surface of the lens assembly  16 . As such, the M-LES and the A-LES are essentially the same and generally corresponds to the entirety of the front surface of the lens assembly  16  as well as the entirety of the front opening of the mounting structure  14 . 
     In the embodiments that follow, the internal optic  36 , the lens assembly  16 , or a combination thereof is altered such that the A-LES for the lighting fixture  10  is substantially reduced from the M-LES to achieve various light output goals. In each embodiment, the mounting structure  14  is kept unchanged simply to illustrate the degree of change that is possible for a given fixture construction by altering these components. Those skilled in the art will recognize that the concepts disclosed herein are applicable to virtually any shape or size of lighting fixture  10 . 
       FIG. 7  illustrates a front isometric view of the lighting fixture  10  with the lens assembly  16  and diffuser  38  removed and the internal optic  36  in place, such the array of LEDs  50  of the light source  34  are aligned with the light receiving opening  36 R of the internal optic  36 . In this embodiment, the internal optic  36  is modified to such that the light emitting opening  36 E is substantially smaller than the front opening of the mounting structure  14 , and as such is smaller than the M-LES of the lighting fixture  10 . 
     Details of the internal optic for this embodiment are illustrated in respective front isometric, bottom isometric, side, and cross-sectional views in  FIGS. 8A-8D . The internal optic  36  has an annular shroud  36 S with the light emitting opening  36 E centrally located therein. A tubular optic body  36 B is conical, extends rearward from the light emitting opening  36 E, and terminates at the light receiving opening  36 R. The diameter of the conical optic body  36 B linearly increases from the smaller light receiving opening  36 R to the larger light emitting opening  36 E. 
       FIGS. 8E and 8F  illustrate front and rear isometric views of the internal optic  36  residing in position within the lens assembly  16 . As shown, a rearward-extending rim that runs around the perimeter of the lens assembly  16  receives the shroud  36 S. The rest of the lighting fixture  10  is not illustrated. When used with the lens assembly  16 , the circular A-LES on the lens assembly  16  will correspond to the circular light emitting opening  36 E, as illustrated in the front isometric view of  FIG. 8E . 
       FIG. 9A  depicts the lighting fixture  10  with the lens assembly  16  installed. The A-LES is identified by the dashed line on the front surface of the lens assembly  16  and corresponds to the light receiving opening  36 R of the internal optic  36 . The A-LES is substantially smaller than the M-LES, which corresponds to the entirety of the front surface of the lens assembly  16 , in this embodiment. While smaller in area, the A-LES has substantially the same shape, a circle, as the M-LES.  FIG. 9B  provides a cross-sectional view of the lighting fixture  10  with the internal optic  36  and the lens assembly  16  in place. Notably, the diffuser  38  is provided between the lens assembly  16  and the shroud  36 S of the internal optic  36 . Diffusion in general is optional, as is the diffuser  38 . If diffusion is desired, but the diffuser  38  is undesirable, diffusion may also be integrated into all or at least the portion of the lens assembly  16  associated with the A-LES, as described further below. 
     As such, a lens assembly  16  may be provided that is removably attachable to the mounting structure  14  and configured to cover the front opening of the mounting structure  14 . When attached to the mounting structure  14 , the lens assembly  16  may hold the internal optic  36  within the cavity of the mounting structure  14 , such that internal optic  36  is not otherwise affixed to the mounting structure  14 . As such, the light emitting opening  36 E of the internal optic  36  defines on the lens assembly  16  an actual LES that is substantially less than the maximum potential LES for the lighting fixture  10 . Further, the internal optic  36  is modular and can be readily replaced with another internal optic  36  that has a different LES (A-LES), output beam characteristic, or a combination thereof. 
     In one embodiment, the front opening of the mounting structure  14  has a first shape, and the light emitting opening  36 E has a second shape, which is substantially different from the first shape. Further, the light emitting opening  36 E may be centered on or offset from the center of the front opening of the mounting structure  14 . The optic body  36 B may extend from the shroud  36 S and terminate at a light receiving opening  36 R, which is configured to receive and surround the LEDs  50  of the LED light source  34 . 
     Depending on the needs of the lighting application, the light receiving opening  36 R may have a first shape, and the light emitting opening  36 E may have a second shape, that is substantially the same or different from the first shape. The size of the light emitting opening  36 E and the light receiving opening  36 R may be the same or different. Further, the optic body  36 B may take on virtually any shape, such as conical, pyramidal, rectangular, polygonal, or the like. In certain embodiments, the actual LES has an area that is less than about 70%, 50%, 30%, or 20% of an area of the maximum potential LES. These characteristics of the optic body  36 B apply the various embodiments that are described below. 
       FIG. 9C and 9D  illustrate an embodiment wherein the lens assembly  16  and the internal optic  36  are effectively integrated to form a lens assembly with an integrated optic. This integrated piece is referred to as an integrated lens assembly  16 O.  FIG. 9C  is a cross-sectional view and  FIG. 9D  is a front isometric view of the integrated lens assembly  16 O installed in the lighting fixture  10 .  FIGS. 10A through 10G  provide various isometric, plan, and cross-sectional views of the integrated lens assembly  16 O.  FIGS. 9C, 9D and 10A through 10G  are referenced for the following description. 
     The integrated lens assembly  16 O is primarily formed from the optic body  36 B, shroud  36 S, and a lens  36 L. The shroud  36 S is annular in this example and may include the rearward extending tabs  40  along the perimeter or other mechanism for connecting the integrated lens assembly  16 O to the mounting structure  14  in the same or similar manner as described above with the lens assembly  16 . As with the previous embodiment, the optic body  36 B is conical and extends rearward from the larger, circular light emitting opening  36 E and terminates at the smaller, circular light receiving opening  36 R, which receives the array of LEDs  50 . 
     The lens  36 L can be integrally formed or mounted anywhere inside the optic body  36 B. As illustrated, the lens  36 L is provided at the light emitting opening  36 E and has a front face that is substantially flush with the front face of the shroud  36 S. The optic body  36 B and the shroud  36 S may be integrally formed, wherein the lens  36 L is separately formed and then mounted inside the optic body  36 B. Alternatively, the lens  36 L, optic body  36 B, and the shroud  36 S, along with any mounting mechanism, may be integrally formed together from the same or different materials. In yet another embodiment, the optic body  36 B, the shroud  36 S, and the lens  36 L are each independently formed and configured to connect to each other using a snap-fit technique or the like. The A-LES and the M-LES for this embodiment is the same as illustrated in  FIG. 9A , wherein the A-LES corresponds to perimeter of the lens  36 L. 
     In any of these embodiments, the optic body  36 B, the shroud  36 S, as well as the lens  36 L may be formed from the same or different materials and have the same or different degree of transparency, translucency, or opaqueness. For the purposes herein, the term “degree of transparency” is defined as a relative term that can range from purely transparent to purely opaque with varying degrees of translucency therebetween. For example, the lens  36 L may be formed from an acrylic, be translucent, and either coated or formed to provide the desired diffusion. Alternatively, the lens  36 L could be a total internal reflector. The optic body  36 B may be formed to include a relatively reflective interior surface, and the shroud  36 S may be formed from a plastic or metal to provide a desired aesthetic or complement the light control properties provided by an exterior optic (not shown). For example, at least the exposed surface of the shroud  36 S may match the appearance of the lens  36 L, contrast with the appearance of the lens  36 L, as well as have the same or different degree of transparency as the lens  36 L. In essence, each part of the integrated lens assembly  16 O or the internal optic  36  can be formed from the same or different components and have the same or different aesthetic. 
     The A-LES need not be centered or correspond to the same shape as the front opening of the mounting structure  14 . With reference to  FIG. 11 , the light emitting opening  36 E in this embodiment is provided in the shroud  36 S of the internal optic  36  and is an elongated rectangle that is shifted off of center. In this embodiment, the internal optic  36  is configured such that the light emitting opening  36 E is substantially smaller than the opening at the front of the mounting structure  14 . Details of the internal optic for this embodiment are illustrated in respective isometric, plan, and cross-sectional views of  FIGS. 12A-12L . The internal optic  36  has a shroud  36 S with the rectangular light emitting opening  36 E located therein. The tubular optic body  36 B extends rearward from the rectangular light emitting opening  36 E and terminates at a circular light receiving opening  36 R. This configuration is referred to as a rectangular bisymmetric shift, since the A-LES is substantially rectangular and symmetric about only one plane. 
       FIG. 13  depicts the lighting fixture  10  with the internal optic  36  of  FIG. 11  and the lens assembly  16  installed. Again, the A-LES is identified by the dashed line and corresponds to the light emitting opening  36 E of the internal optic  36 . The A-LES is substantially smaller than the M-LES, which corresponds to the entirety of the front surface of the lens assembly  16  in this embodiment. While smaller in area, the A-LES also has a substantially different, rectangular shape than the circular M-LES and is not centered within the M-LES or lens assembly  16 . 
       FIGS. 14A-14F  are various isometric and plan views of an alternative embodiment of the internal optic  36 . The internal optic  36  in this embodiment has a shroud  36 S with a substantially rectangular light emitting opening  36 E located therein. The light emitting opening  36 E is not located in the center of the shroud  36 S. The shorter sides of the rectangular light emitting opening  36 E are linear, while the longer sides of the rectangular light emitting opening  36 E are curved, such that they are concave relative to the inside of the light emitting opening  36 E. The tubular optic body  36 B extends rearward from the light emitting opening  36 E and terminates at a circular light receiving opening  36 R. This configuration is referred to as a modified rectangular bisymmetric shift, since the resultant A-LES is generally, but not exactly, rectangular and symmetric about only one plane. When used with the lens assembly  16 , the A-LES on the lens assembly  16  will correspond to the light emitting opening  36 E. 
       FIGS. 15A-15F  are various isometric and plan views of an alternative embodiment of the internal optic  36 . The internal optic  36  in this embodiment has a shroud  36 S with a rectangular light emitting opening  36 E located therein. The light emitting opening  36 E is located in the center of the shroud  36 S. The tubular optic body  36 B extends rearward from the light emitting opening  36 E and terminates at a circular light receiving opening  36 R. This configuration is referred to as a rectangular symmetric shift, since the resultant A-LES is rectangular and symmetric about two perpendicular planes. When used with the lens assembly  16 , the A-LES on the lens assembly  16  will correspond to the light emitting opening  36 E. 
       FIGS. 16A-16F  are various isometric and plan views of an alternative embodiment of the internal optic  36 . The optic body  36 B takes on a rectangular, pyramidal shape. The internal optic  36  in this embodiment has a shroud  36 S with a substantially rectangular light emitting opening  36 E located therein. The longer sides of the rectangular light emitting opening  36 E are linear, while the shorter sides of the rectangular light emitting opening  36 E are curved, such that they are concave relative to the inside of the light emitting opening  36 E. The light emitting opening  36 E is located in the center of the shroud  36 S. The hollow optic body  36 B extends rearward from a larger rectangular light emitting opening  36 E and terminates at a smaller rectangular light receiving opening  36 R. In this embodiment, the intersections of adjacent sidewalls of the optic body  36 B and the intersections of each sidewall with the shroud  36 S are beveled in a concave (as shown), convex, or linear fashion. Further, the rear edges of the four sidewalls of the optic body  36 B are beveled inward to form the light receiving opening  36 R. Avoiding 90-degree angles at these various intersections may improve the efficiency of the mixing chamber, which is substantially defined by the interior cavity of the optic body  36 B. 
       FIGS. 16G and 16H  illustrate front and rear isometric views of the internal optic  36  residing in position within the lens assembly  16 . As shown, a rearward-extending rim that runs around the perimeter of the lens assembly  16  receives the shroud  36 S. The rest of the lighting fixture  10  is not illustrated. When used with the lens assembly  16 , the rectangular A-LES on the lens assembly  16  will correspond to the rectangular light emitting opening  36 E, as illustrated in the front isometric view of  FIG. 16G . 
       FIGS. 17A-17E  are various isometric and plan views of an alternative embodiment of the internal optic  36 . The optic body  36 B takes on a substantially square, pyramidal shape. The internal optic  36  in this embodiment has a shroud  36 S with a substantially square light emitting opening  36 E located therein. The sides of the square light emitting opening  36 E are linear. The light emitting opening  36 E is located in the center of the shroud  36 S. The hollow optic body  36 B extends rearward from a larger, square light emitting opening  36 E and terminates at a smaller, square light receiving opening  36 R. In this embodiment, the intersections of adjacent sidewalls of the optic body  36 B and the intersections of each sidewall with the shroud  36 S are beveled in a convex (as shown), concave, or linear fashion. Further, the rear edges the four sidewalls of the optic body  36 B turn inward to form the light receiving opening  36 R. Avoiding 90-degree angles at these various intersections may improve the efficiency of the mixing chamber, which is substantially defined by the interior cavity of the optic body  36 B. 
       FIGS. 17F and 17G  illustrate front and rear isometric views of the internal optic  36  residing in position within the lens assembly  16 . The rest of the lighting fixture  10  is not illustrated. When used with the lens assembly  16 , the square A-LES on the lens assembly  16  will correspond to the square light emitting opening  36 E, as illustrated in the front isometric view of  FIG. 17F . 
       FIGS. 18A-18E  are various isometric and plan views of an alternative embodiment of the internal optic  36 . The optic body  36 B takes on a semi-conical shape. The internal optic  36  in this embodiment has a shroud  36 S with a semi-circular light emitting opening  36 E located therein. The curved portion of the light emitting opening  36 E runs along the perimeter of the shroud  36 S, while the linear portion of the light emitting opening  36 E substantially bisects the shroud  36 S. The hollow optic body  36 B extends rearward from the light emitting opening  36 E and terminates at a smaller, semi-circular light receiving opening  36 R. 
       FIGS. 18F and 18G  illustrate front and rear isometric views of the internal optic  36  residing in position within the lens assembly  16 . The rest of the lighting fixture  10  is not illustrated. When used with the lens assembly  16 , the semi-circular A-LES on the lens assembly  16  will correspond to the semi-circular light emitting opening  36 E, as illustrated in the front isometric view of  FIG. 18F . 
     As those skilled in the art will appreciate, all of the aforementioned configurations for the internal optic  36  can be applied to an integrated lens assembly  16 O. 
       FIGS. 19A-19E  provide various isometric, plan, and cross-sectional views of an alternative embodiment of the integrated lens assembly  16 O. In this embodiment, the internal optic  36  and lens  36 L of the previous embodiment are integrated to provide an internal lens  361 . As such, the integrated lens assembly  16 O is primarily formed from the shroud  36 S and the internal lens  361 . The shroud  36 S is again annular in this example and may include the rearward extending tabs  40  along the perimeter or other mechanism for connecting the integrated lens assembly  16 O to the mounting structure  14  in the same or similar manner as described above with the lens assembly  16 . 
     The exterior of the internal lens  361  in this example is substantially parabolic and increases in diameter from a flat light emitting end  36 E′ to a light receiving end  36 R′. The flat light emitting end  36 E′ aligns with a hole in the shroud  36 S. The light receiving end  36 R′ leads to a parabolic cavity  36 C within the lens  36 L. Notably, the light emitting end  36 E′ of the internal lens  361  is solid, and thus, there is no opening in the light emitting end  36 E′ that leads to the cavity  36 C. The light receiving end  36 R′ is sized to surround the array of LEDs  50 . Further, the light emitting end  36 E′ need not be flat and can be concave, convex, smooth, textured, and the like depending on the lighting application. The light emitted from the array of LEDs  50  will be reflected through the hole in the shroud  36 S via the light emitting end  36 E′. As such, the A-LES will correspond to one of the hole in the shroud  36 S and the light emitting end  36 E′, depending on the configuration. In this example, the hole in the shroud  36 S and the light emitting end  36 E′ are substantially coincident and respective perimeters correspond to the A-LES. While a substantially parabolic internal lens  361  is shown, the internal lens  361  may take virtually any shape and will be constructed according to the needs of the lighting application. 
     The internal lens  361  and the shroud  36 S may be separate and configured to mate together or may be integrally formed. In any of these embodiments, the internal lens  361  and the shroud  36 S may be formed from the same or different materials and have the same or different degree of transparency, translucency, or opaqueness. For example, the internal lens  361  may be formed from an acrylic or silicon. The shroud  36 S may be formed from a plastic or metal to provide a desired aesthetic or complement the light control properties provided by an exterior optic (not shown). For example, at least the exposed surface of the shroud  36 S may match the appearance of the internal lens  361 , contrast with the appearance of the internal lens  361 , as well as have the same or different degree of transparency as the internal lens  361 . In essence, each part can be formed from the same or different components and have the same or different aesthetic. The internal lens  361  could also take the form of a total internal reflector (TIR). 
       FIGS. 20A-20F  provide various isometric, plan, and cross-sectional views of the integrated lens assembly  16 O, which employs a TIR. The integrated lens assembly  16 O is primarily formed from the optic body  36 B, shroud  36 S, and the TIR. The shroud  36 S is annular in this example and may include the rearward extending tabs  40  along the perimeter or other mechanism for connecting the integrated lens assembly  16 O to the mounting structure  14  in the same or similar manner as described above with the lens assembly  16 . As with the previous embodiment, the optic body  36 B is conical and extends rearward from the larger, circular light emitting opening  36 E and terminates at the slightly smaller, circular light receiving opening  36 R. 
     The TIR can be integrally formed or mounted anywhere inside the optic body  36 B. As illustrated, the TIR is recessed into the internal cavity of the optic body  36 B and has a perimeter edge that snaps into an annular channel  36 H (shown) or other connection mechanism formed into or on the inside wall of the optic body  36 B to hold the TIR in place. The illustrated TIR has a flat rear surface and a convex front surface, but may take virtually any shape and be located at any position along the optic body  36 B. The A-LES corresponds to the light emitting opening  36 E. 
     In any of these embodiments, the optic body  36 B, the shroud  36 S, as well as the TIR may be formed from the same or different materials and have the same or different degree of transparency, translucency, or opaqueness. For example, the TIR may be formed from an acrylic, silicone, or the like, be translucent, and either coated or formed to provide the any desired diffusion. The optic body  36 B and the shroud  36 S may be formed from a plastic or metal to provide a desired aesthetic or complement the light control properties provided by an exterior optic (not shown). Further, the TIR may be replaced with a simple clear or diffused lens in an alternate embodiment. 
     Another embodiment of an integrated lens assembly  16 O that employs a TIR is illustrated in  FIGS. 21A through 21  F. In this instance, the TIR wedges into the cavity provided by the optic body  36 B and has a unique profile. With particular reference to the cross-sectional view of  FIG. 21  F, the outside of the TIR is conical, while the end of the TIR that is adjacent the light receiving opening  36 R has a conical recess. The end of the TIR that is adjacent the light emitting opening  36 E has a parabolic recess. These respective recesses, as well as the TIR, may take on various shapes and be attached to the optic body  36 B in a variety of ways based on the demands of the lighting application as well as the desired configuration of the integrated lens assembly  16 O and the lighting fixture  10  in general. 
     The lighting fixture  10  may be used in conjunction with any number of accessories. An exemplary accessory, such as an external optic or reflector  52 , is shown in  FIG. 22 . The reflector  52  may be configured to mount to the annular flange  22  or other portion of the mounting structure  14 . Further, the reflector  52  may be sized and shaped to provide a desired aesthetic as well as to coordinate with the internal optic  36  or an integrated lens assembly  16 O to provide a desired output light pattern. As with the internal optic  36  and the integrated lens assembly  16 O, the reflector  52  is modular and may be selected based on the internal optic  36 , the integrated lens assembly  16 O, desired aesthetics and the like. 
     Those skilled in the art will recognize improvements and modifications to the embodiments of the present disclosure. All such improvements and modifications are considered within the scope of the concepts disclosed herein.