Abstract:
A bandless seam between reflector and refractor sections of a luminaire globe formed of light-transmissive material and configured to improve optical performance as well as facilitate effective mounting of the reflector and refractor sections together, the invention finds particular utility with suspended luminaires ordinarily requiring a metal band or the like to join said sections into a luminaire globe. Opposing peripheral edge surfaces of the reflector and refractor sections are shaped according to the invention not only to cause even flow of adhesive between said surfaces to adhere said sections to each other but also to reduce brightness at the resulting seam between the sections, thereby improving luminaire appearance and reducing seam brightness and optical glint.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates generally to luminaires having reflector and refractor sections preferably formed of light-transmissive material and mated together to form a globe within which a light source is disposed, the invention particularly relating to a bandless seam between said sections and having improved appearance and optical characteristics. 
     2. Description of the Prior Art 
     Luminaires intended for both indoor and outdoor illumination have long been known in the art to include combination reflector/refractor light-transmissive “globes” utilizable with a variety of lamping configurations to provide particular light distribution characteristics for a given application. Such reflector/refractor combinations have typically been formed of materials such as glass and plastic materials such as acrylics, etc., and often employ prisms and similar light-altering structures formed on either interior or exterior surfaces, or both, of such prior reflector/refractor combinations. Light is directed in these prior combinations from an associated lamp in a manner providing a desired level of lighting within a space that is to be illuminated. In applications thus referred to, at least the refractor section of the combination is formed of a light-transmissive material such as glass with the reflector section often being formed also of glass or a light-transmissive acrylic material or the like. Luminaire globes of this description are typically either pole-mounted, usually for outdoor applications, or “suspended” for either indoor or outdoor applications. When a luminaire globe of the kind referred to herein is “pole-mounted”, support for the globe is typically provided from a location beneath the globe, it not therefore being as necessary to provide a positive attachment between the reflector section and the refractor section since the seam or joint therebetween is not required to support the weight of the refractor section. In suspended applications, it is usually necessary to positively attach the refractor section to the surmounting reflector section such as through the use of a band or other mechanical support. It should be noted, however, that globes used in pole-mounted applications often provide a band at a seam between reflector and refractor sections for increased surety of connection therebetween and/or for the sake of appearance. For example, Ewing, in U.S. Pat. No. Des. 441,115, shows a luminaire globe intended to be supported by a pole from beneath said globe. Ewing also provides a band at the seam between reflector and refractor sections as an element of the appearance of the luminaire as well as for providing an increased degree of attachment therebeween. Other patents disclosing luminaire globes formed of light-transmissive material and being mounted such as at the upper ends of poles or similar stanchions are disclosed by Sitzema et al, in U.S. Pat. No. 5,743,634, and by Orosz, in U.S. Pat. No. 4,719,548, the disclosures of these patents being incorporated hereinto by reference. Sitzema et al particularly disclose a reflector/refractor combination formable of either glass or acrylic materials and wherein a pole or the like supports the refractor for mounting of the reflector thereto, there being no need therefore to support the weight of the refractor with a band formed about a seam or joint between the reflector and the refractor. However, Sitzema et al disclose the use of an adhesive to adhere the reflector to the refractor. In Sitzema et al, adhesive is not employed to attach the refractor directly to the reflector such that an adhesive joint is the sole mechanism for preventing detachment between the reflector and the refractor. Orosz attaches a refractor to a surmounting reflector through the use of an adhesive and screws even though the Orosz luminaire is mounted by a pole. 
     Arumugasaamy, in U.S. Pat. No. 6,336,734 and also in U.S. Pat. No. Des. 4,040,341, discloses a glass reflector/refractor combination in a suspended luminaire and having a band employed at a seam between the reflector and the refractor for supporting the weight of the refractor. Arumugasammy illustrates the manner in which the use of a band can be incorporated into the appearance of a suspended luminaire in an effective manner. Other United States design patents having similar disclosures are issued to Ewing et al, as U.S. Pat. No. Des. 400,273; Gruber et al as U.S. Pat. No. Des. 350,622; and to Hughes et al as U.S. Pat. No. Des. 321,408. In U.S. Pat. No. 5,174,648, Clary et al disclose a suspended luminaire having a glass or acrylic globe with a band formed about the seam therebetween for supporting at least in part the weight of a refractor portion of the luminaire. Van Steenhoven, in U.S. Pat. No. 3,950,639, mounts a refractor to a reflector by means of a metal ring formed about a seam between the reflector and refractor. Harling, in U.S. Pat. No. 3,329,812, mounts a glass refractor to a metal reflector. Fouke, in U.S. Pat. No. 6,027,231 provides a flange at a seam between a glass reflector/refractor combination, the disclosure of this patent being incorporated hereinto by reference. Similar disclosure is also provided by Fouke in U.S. Pat. No. 4,858,091, the disclosure of which is incorporated hereinto by reference. Luminaire globes comprising reflector/refractor combinations are disclosed by Blondel et al, in U.S. Pat. No. 563,836 and by Franck, in U.S. Pat. Nos. 2,818,500 and 2,887,568, the disclosures of these patents being incorporated hereinto by reference. 
     As can be appreciated from a review of the patents noted above, it has been common in the art to employ a band or similar structure about a seam between a reflector section and a refractor section of a luminaire globe in order to positively attach the refractor to the reflector especially in suspended situations and, as can be seen from a review of certain of the patents noted above, even in pole-mounted applications. The necessity for the use of a band or similar structure has been ameliorated by the creativity of the designers of such luminaire globes through the agency of causing the bands or similar structure to be decorative. However, the use of a band or the like invariably causes a reduction in lighting performance since light is lost through reflection off internal surfaces of such a band and such bands prevent uninterrupted illumination through the entirety of the refractor section of such a globe. Even in luminaire globes not employing bands, a seam or joint between reflector and refractor sections typically causes glare or optical “glint” due to the fact that light passing through the seam produces a line or “band” of bright light that differs from the quality of light passing through the reflector section and the refractor section, said reflector and refractor sections often being provided at considerable expense with prismatic structures intended to produce a pleasing quality of light emanating from the luminaire globe. 
     In applications where a “clean” appearance is desired, that is, a “bandless” appearance is necessary in order to provide decorative function inter alia, prior approaches to solution of the above-noted deficiencies in the art have not yielded luminaire globe function of a kind acceptable to particular applications when considering appearance and evenness of illumination. An advance in the art would therefore be realized through an ability to attach a refractor to a reflector, particularly for a suspended luminaire, without the requirement for a band disposed about a seam between a reflector and refractor and wherein the seam therebetween is not subject to a high degree of optical glint and/or glare. The present invention therefore intends solution to the deficiencies noted above by providing a seam or joint between a reflector section and a refractor section of a luminaire globe whereby adhesive is evenly applied to opposed mating peripheral edges thereof to reduce brightness at the seam and to provide at least some degree of attachment function at the joint therebetween. Luminaire globes configured according to the invention therefore exhibit a desired physical appearance and produce a desirable quality of illumination. 
     SUMMARY OF THE INVENTION 
     The invention in several aspects relates to structure and methodology involving a seam or joint between reflector and refractor sections of a luminaire globe such as a globe formed of glass, acrylic or other light-transmissive material. Luminaire globes improved according to the teachings of the invention typically have prismatic or similar light-directing structures on either the reflector section or the refractor section, or both. Luminaire globes that are component parts of suspended luminaires, in particular, must be provided with a mechanism whereby a relatively heavy refractor section is caused to be mounted or attached to a surmounting reflector section, the seam or joint therebetween optically differing from remaining portions of the luminaire globe. Accordingly, the seam visibly differs from remaining portions of the globe and is typically a source of glare or optical glint due to the seam appearing as a bright annular “line” extending about the globe. 
     The invention in its several aspects provides shaped surfaces on mating annular peripheral edges of the reflector section and of the refractor section, these shaped surfaces particularly acting to cause an even flow of an adhesive applied thereto on joining of the reflector and the refractor sections together. This even flow of adhesive causes the seam between said sections to be optically more acceptable due to the existence of adhesive in a uniform disposition essentially throughout the seam, light passing through the seam being caused to be more efficiently passed therethrough and with improved appearance. Further, an even and complete flow of the adhesive over mating surfaces of the reflector and of the refractor permits the formation of a joint of greater strength to the degree that relatively small luminaire globes, even when used in a suspended luminaire, can be mounted together solely through the use of adhesive. 
     In essential form, the invention minimizes flanges typically employed between reflector and refractor sections of a luminaire globe to the point of permitting a continuous curvature to exist between the reflector and refractor section, that is, to essentially eliminate the appearance of an external flange altogether. The shaped surfaces of the mating peripheral edges of the reflector and refractor sections act to provide a necessary degree of alignment between the reflector and refractor sections as well as to cause uniform flow of adhesive within the joint between said sections. An appropriate sizing and shaping of certain wall surfaces of the structure defining the present seam also functions to reduce glare by directing light passing through the seam above horizontal so as not to be visible from normal locations within an environmental space in which a luminaire employing the present globes are disposed. 
     Accordingly, it is a primary object of the present invention to provide a seam for a luminaire globe formed of a reflector section and a refractor section wherein peripheral opposed edges of said sections are contoured in order to cause even flow of adhesive therebetween when joined together and to further reduce optical glint and glare due to shaping of at least portions of said section edges defining the seam. 
     It is another object of the present invention to provide a seam between reflector and refractor sections of a luminaire globe formed of a light transmissive material such as glass, acrylic or the like, and wherein the appearance of the seam is minimized. 
     It is a further object of the invention to provide a luminaire globe formed of reflector and refractor sections wherein the sections are provided with contoured peripheral edges joinable together to attach said sections without the need for a structural band disposed over the seam for attaching the refractor section to the reflector section. 
     Further objects and advantages of the invention will become more readily apparent in light of the following detailed description of the preferred embodiments. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a side elevational view of a luminaire globe of the prior art forming a component part of a suspended luminaire and wherein a structural band is disposed about a seam between reflector and refractor portions of the globe for purposes of attaching said portions together; 
     FIG. 2 is a side elevational view of a luminaire globe configured according to the invention and illustrating a bandless seam as can be provided through a practice of the invention; 
     FIG. 3 is a detailed side elevational view in section of a reflector portion of a luminaire globe configured according to the invention and illustrating details of contours of an annual peripheral edge thereof; 
     FIG. 4 is a detailed side elevational view in section of a refractor portion of a luminaire globe configured according to the invention and illustrating the shaped contours of a peripheral edge of the refractor portion, said edges being mateable to corresponding edges of the reflector portion seen in FIG. 3; 
     FIGS. 5A and 5B are schematics of the contoured surfaces of the peripheral edges of the reflector and refractor sections and being dimensioned; 
     FIG. 6 is a schematic of edge portions of the reflector and refractor portions of a luminaire globe configured according to the invention and illustrating placement of an adhesive bead therebetween; 
     FIG. 7 is a schematic illustrating the mated disposition of the peripheral edge portions of the reflector and refractor portions of a luminaire globe configured according to the invention and illustrating disposition of the curved adhesive of FIG. 6 between said edges; 
     FIG. 8 is a side elevation in section of a luminaire globe configured according to a further embodiment of the invention and illustrating attachment of reflector and refractor portions together with only the use of adhesive; 
     FIG. 9 is a side elevation in section of a luminaire globe configured according to one embodiment of the invention and utilizing mechanical expedients to additionally effect attachment of reflector and refractor portions together; 
     FIG. 10 is a schematic illustrating a prior art flange arrangement configured conventionally for joining reflector and refractor portions of a prior art luminaire globe together according to the teachings of the prior art; 
     FIG. 11 is a schematic illustrating shaped surfaces of a seam configured according to the invention and being contoured to direct light rays above horizontal for glare reduction; and, 
     FIG. 12 is a schematic illustrating diagrammatically the relationship of lamp placement to seam contours necessary to direct light externally of a luminaire globe for glare reduction. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Reference is hereby made to U.S. patent application Ser. No. 10/280,279, filed of even date and entitled “Prismatic Structures Having Shaped Surfaces” and assigned to the present assignee, the disclosure of this patent application being incorporated hereinto by reference. Reference is further made to U.S. patent application Ser. No. 10/280,281, filed of even date and entitled “Reflector/Refractor Light Control Luminaire” and assigned to the present assignee, the disclosure of this patent application being incorporated hereinto by reference. 
     Referring now to the drawings and particularly to FIGS. 1 and 10, at least a portion of a prior art luminaire is seen at  10  to comprise a globe  11  formed of a reflector portion  12  and a refractor portion  14 , the portions  12  and  14  being attached together at a seam therebetween by means of a band  16  which is typically formed of metal. A hanger bar  18  is typically employed to suspend the luminaire  10  in a conventional manner. The reflector portion  11  and a refractor portion  14  are typically formed of a borosilicate glass or acrylic plastic as well as a variety of other light-transmissive materials such as are commonly employed in the art. The band  16  typically is formed of a sheet metal material that is mechanically rolled and used to fasten the portions  12 ,  14  together about protruding flanges (not shown in FIG.  1 ), the structure of the flanges being better appreciated by reference to FIG. 11 wherein a prior art refractor  70  similar in structure and function to the refractor portion  14  of FIG. 1 is seen to be provided with a flange  72  protruding from outer surfaces of the refractor  70 . It is to be appreciated that the flange  72  is essentially annular in conformation and extends peripherally about the refractor  70 . The luminaire  10  of FIG. 1 as well as the refractor  70  and flange  72  of FIG. 11 are conventional in the art. 
     A joint thus formed between the prior art reflector portion  12  and the refractor portion  14  is typically formed by smooth-surfaced flange elements (not shown in FIG.  1 ), a silicon adhesive (not shown) also typically being employed between said flange elements to improve attachment between the portions  12  and  14 . Flange elements of the portions  12 ,  14 , such as the flange  72  of the prior art refractor  70  of FIG. 10, protrude from exterior surfaces of said portions  12 ,  14  due in part to the necessity for rolling the metal band  16  over at least major portions of exterior surfaces of said flange elements such as the flange  72  of FIG. 10 in order to provide an appropriate connection between the portions  12 ,  14 . As is common in the art, prisms and/or other light-directing structure can be formed on interior and/or exterior surfaces of the reflector portion  12  and the refractor portion  14 . 
     The seam or joint between the reflector portion  12  and the refractor portion  14  of the prior art luminaire globe  11  must be reconfigured when it is desired to create a luminaire globe of an appearance wherein a smooth, uninterrupted and bandless profile is desired. Further, the optical characteristics of a luminaire globe should be improved in an acceptable commercial luminaire when a bandless profile is desired. At least a portion of the light generated by a light source (not shown) located within the luminaire globe  11  is wasted through incidence on interior surfaces of the band  16  since a banded seam between the portions  12  and  14  will not pass light in the manner of the light-transmissive portions of the reflector portion  12  and the refractor portion  14 . However, even if the band  16  were to be removed, prior art connection expedients utilized to attach the reflector portion  12  to the refractor portion  14  can be less than satisfactory. Optical glint or glare typically occurs as a ring of brightness on passage of light through a seam as is provided by a flange structure such as is embodied in the prior art flange  72  of FIG.  10 . In order to reduce an undesirable high degree of brightness at a seam between reflector and refractor portions of a luminaire globe, the embodiments of the present invention are provided. 
     Referring now to FIG. 8, a luminaire globe is seen at  20  to be formed of a reflector section  22  and a refractor section  24 , the sections  22  and  24  having a seam or joint seen at  26  formed therebetween at the loci of attachment between respective annular peripheral edges  28 ,  29  of said sections  22 ,  24 . The annular peripheral edge  28  of the reflector section  22  is also seen with reference to FIGS. 3 through 7 to take the form of a surface of revolution having a cross-sectional shape as is seen in FIGS. 5A,  5 B and  6  inter alia. Similarly, the annular peripheral edge  29  of the refractor portion  14  can be seen to take the form of a surface of revolution having a cross-sectional shape as is best seen in FIGS. 5 and 6 inter alia. The edges  28  and  29  are engaged to form the seam  26  and are preferably connected together at least in part by an adhesive material such as will be described hereinafter. As can also be seen with reference to FIG. 9, mechanical expedients can also be employed for connecting a refractor section to a reflector section in the event that the refractor section is of a weight requiring an additional fastening function between reflector and refractor portions of a luminaire globe as will be described hereinafter. As can also be appreciated, the reflector section can alternatively be formed of a material such as aluminum. 
     It is to be seen in FIG. 8 inter alia that the reflector section  22  can be formed with external prisms  34  and internal prisms  36  as is conventional in the art although the prisms  34 ,  36  can be formed as is described in the copending U.S. patent applications referred to hereinabove. Similarly, the refractor section  24  can be provided with external prisms  38  and internal prisms  40  that can either be conventional in the art or formed as is described in the copending United States patent applications referred to hereinabove. In FIG. 2, a particular configuration of a luminaire globe according to the invention is shown to be formed of a reflector section and a refractor section such as the sections  22  and  24  respectively, the globe having only certain prisms exaggerated at portions of the refractor section  24  relative to other external prisms formed thereon merely for ease of illustration. 
     Referring particularly to FIGS. 3 through 7, the peripheral edge  28  of the reflector section  22  is seen as being preferably formed in a particular shape that is rounded at corner  41  at an outer surface of the reflector section  22 , the corner  41  rounding to a flat surface at  42  which curves inwardly of a medial portion of said edge  28  to form a boss  44  having a curved outward shoulder  45  and a curved inward shoulder  47 , a flat surface  46  defining the boss  44  between the shoulders  45  and  47 . The curved shoulder  47  terminates through intersection with interior surface  48  of the reflector section  22 . 
     The peripheral edge  29  of the refractor section  24  has a rounded corner at  50  disposed at the outside surface of the refractor section  24 , the rounded corner  50  curving to a flat surface at  51  which then rounds at  52  to form a curved shoulder which then terminates in a curved shoulder  52  slightly outwardly of a medial portion of the edge  29 . The shoulder  52  rounds to form a flat surface  54  which in turn curves inwardly of the refractor section  24  to form a curved shoulder  55  which then rounds to form a shoulder  56  which terminates through intersection with an interior surface  62  of the refractor section  24 . 
     The preferred shapes of the edges  28  and  29  as thus described are seen to extend fully about said sections  22 ,  24 . The refractor section  24  is joined to the reflector section  22  by means of a bead  64  of adhesive as is best seen in FIG. 6, the bead of adhesive being placed preferably in juxtaposition to the curved shoulder  52  and above outer portions of the flat surface  54 . Pressing of the edges  28  and  29  together causes the adhesive bead  64  to deform and flow between said edges  28 ,  29  with excess adhesive being forced toward the interior of the seam  26  and expressed inwardly thereof and into that space formed at  58  between the shoulder  47  of the edge  28  and the shoulder  56  of the edge  29 . Since interior surfaces of the luminaire globe  20  cannot be viewed from externally thereof, it is not necessary to clean up excess adhesive expressed into the space  58 . Since adhesive is directed inwardly of the globe  20 , a clean appearance is created externally of the seam  26  as the luminaire globe  20  viewed from externally thereof. The geometry of the shaped surfaces of the edges  28 ,  29  causes adhesive to flow relatively evenly thereover so that maximum adhering function is obtained. Further, the geometry of the edges  28 ,  29  permits a predetermined distance to remain between major portions of the opposing edges  28 ,  29  so that adhesive is located essentially in a channel between the edges  28 ,  29  and cures therebetween. Particularly favorable dimensions of the shaped surfaces of the edges  28 ,  29  can be seen in FIGS. 5A and 5B. It is to be understood that the surfaces  42  and  51  are preferably parallel and that the surfaces  46  and  54  are parallel. 
     The adhesive material employed according to preferred embodiments of the invention comprises a silicone adhesive sealant such as that material manufactured by the General Electric Company under the trade designation RTV108. This adhesive material, as well as other similar materials manufactured by General Electric and others, is a one-component adhesive that cures at room temperature to essentially form a silicone rubber. The bead  64  of adhesive material when composed of the RTV108 adhesive is preferably caused to have a nominal diameter of approximately 0.12 inch. It is to be understood that suitable adhesive materials can be otherwise selected for use according to the invention. The bead  64  can be applied by conventional means such as a caulking gun or an automatic dispenser. 
     FIG. 7 illustrates the reflector section  22  and the refractor section  24  in a position whereby said sections  22 ,  24  are joined together by means of the adhesive thus described and wherein the edges  28 ,  29  abut to the degree permitted by the shape thereof, adhesive being disposed therebetween in a cured state as is represented in FIG.  7 . 
     Referring now to FIG. 9, a luminaire globe seen at  65  is seen to be provided with mechanical supporting structure at  66 , said structure  66  connecting between a mounting collar  67  and a door  68 . Mechanical mechanisms of varying description can be employed to assist in the mounting of reflector and refractor portions of the luminaire globe  65  together in the event that a refractor portion of the globe  65  is of a size and weight requiring an increased degree of connective function to exist between reflector and refractor portions. In the luminaire globe  20  of FIG. 8, the size of said globe  20  is chosen so that the refractor section  24  can be joined to the reflector section  22  solely by means of adhesive material as described above even though said sections  22 ,  24 , and particularly the refractor section  24  are formed of glass or similar material. The ability to adequately join the refractor section  24  to the reflector section  22  is occasioned by the shaping of the edges  28 ,  29  as described above such that adhesive material is caused to evenly flow within a joint formed between said edges  28 ,  29  at the seam  26  and be held between said edges  28 ,  29  with a desired spacing therebetween to permit appropriate curing of the adhesive material. As is seen in FIGS. 8 and 9, luminaire globes  20 ,  65  configured according to the invention have a smooth, interrupted bandless profile providing an appearance desirable in the art. 
     Referring now to FIGS. 11 and 12, it is to be seen that the seam  26  of the luminaire globe  20 , as exemplary and as is designated as  26  in FIG. 2 inter alia, can be formed with reduced brightness at said seam  26  such that a bright circle is not produced at the seam  26  as is characteristic of prior art luminaire globes formed of reflector and refractor portions configured of light-transmissive material in particular. Optical glint or glare is therefore reduced or eliminated according to the invention as will be now detailed. 
     Referring again now to FIG. 10, the prior art flange  72  is seen to protrude outwardly of exterior surfaces of the prior art refractor  70  and to be of a conventional thickness. In particular, the prior art flange  72  of FIG. 10, as is typical of conventional flanges, is of a thickness of approximately 0.312 inch measured as is seen in FIG.  10 . In contradistinction, the edge  29  of the refractor section  24  as seen in FIG. 11 inter alia is seen to include an annulus  69  that is 0.139 inch thick. Prisms, such as the prisms  38  referred to hereinabove are located immediately beneath the annulus  69  of the refractor section  24 . At least certain of the prisms  38  are formed immediately below said annulus  69  in contradistinction to the location of the prisms  74  of FIG. 10 which are spaced from lower surfaces of the prior art flange  72 . Further, the annulus  69  of FIG. 11 is seen to be provided with a flat lower shoulder  84  which is angled at a degree of approximately 10° to an essentially vertical line tangent to or coincident with outermost annular surfaces  86  of said annulus  69 . It is to be understood that the flat lower shoulder  84  is not seen in certain other drawing figures herein due to drawing size limitations, the shoulder  84  being present in structure represented by such drawing figures though not seen. A light ray  76  as seen in FIG. 10 to pass through the prior art flange  72  of the prior art refractor  70  remains horizontal on passage through said prior art flange  72  and thus produces glare. In contradistinction, a light ray  78  as seen in FIG. 11 on passing through the annulus  69  is seen to be directed upwardly above horizontal as is seen at  79  to thereby reduce glare. Further, the reduced thickness of the annulus  69  relative to the flange  72  acts to reduce the amount of light passing through said annulus at the seam  26  of the luminaire globe  20 . Light passing through that portion of the refractor walls of the prior art refractor  70  between lower surfaces of the prior art refractor  70  and the first prism  74  disposed therebelow is also seen as glare or as an addition to a band of brightness additive to the horizontal light rays passing through the prior art flange  72 , thereby producing glare. The prisms  38  disposed immediately below the annulus  69  as seen in FIG. 11, and particularly where prisms  38  are configured as are described in copending U.S. patent application Ser. No. 10/280,279, filed of even date, and entitled “Prismatic Structures Having Shaped Surfaces” and assigned to a common assignee, particularly act to redirect light such that the light passing therethrough is directed in a useable direction and does not produce glare or an optical glint through the seam  26 . 
     FIG. 10 particularly illustrates the manner of preventing glare in an environment wherein the top of a lamp arc tube, such as is represented at  80  in FIG.  8  and at  82  in FIG. 9, is essentially disposed substantially level or even with the seam  26 , that is, at the top of the joint formed between the edges  28 ,  29  of the reflector section  22  and the refractor section  24  respectively. When a lamp arc tube, such as the tubes represented at  80  and  82  as aforesaid, is moved from the level position referred to above, it becomes necessary to alter the angle of the shoulder  84  in the event that the lamp arc tube is moved higher within the interior of a luminaire globe such as the luminaire globe  20  or the luminaire globe  65 . In the event that a lamp were to be moved lower within such globes, the 10° angle of the shoulder  84  accommodates light ray  90  as seen in FIG.  12  and causes said light ray to be directed upwardly as at  92 . However, movement of a lamp arc tube to a higher location within the luminaire globe  20 , for example, would require an increase in the angle of the face of the shoulder  84  to an angle represented by the dashed line  86  in order to cause light ray  94  to refract upwardly above horizontal to prevent glare. As an example, a 1.5 inch change in the effective light center of a lamp source would require a 25° rather than a 10° angle in order to direct light upwardly as at  96 . 
     It is to be understood that the invention can be practiced other than as is explicitly described herein, the globe  20  of the invention being useful in a pole-mounted application as well as for suspended applications. The invention intends and achieves a seam having a virtually non-visible appearance from externally thereof whether or not illuminated. The shaped edges  28  and  29  of the reflector and refractor sections  22 ,  24  should be understood to be preferred as shown due to the ability of said edges  28 ,  29  in concert to control radial distribution of adhesive throughout the periphery of the seam  26  to assure coverage by the adhesive over mating surfaces of the edges  28 ,  29 . The shaped edges  28 ,  29  further act to center the sections  22 ,  24  relative to each other on mounting of said sections  22 ,  24  together in addition to preventing overflow of adhesive outside the seam  26  and directing any excess adhesive inwardly of said seam  26 . The scope of the invention, however, is to be defined by the appended claims.