Patent Description:
A luminaire is a lighting unit that includes an LED lamp or lamps together with components designed to connect the LED lamps to a power supply, to distribute the light, to position the LED lamps, and to protect the LED lamps. A luminaire is often individually oriented in reference to certain unique points on or near the field or target area to be lighted, with multiple luminaires positioned and oriented strategically to illuminate the entire field or target area to be lighted.

Generally, in large venues such as stadiums, multiple lighting units are mounted on each of multiple elevated lighting poles, with one or more crossbeams acting as the mounting points for each lighting unit. As LED-based luminaires have gained popularity for their above-identified advantages, many venues have sought to replace existing lighting fixtures. However, the mounting points, fixtures, and spacing that exists on the crossbeams of lighting poles is not optimized for luminaires, requiring substantial modifications to (and/or complete replacement of) the crossbeams for installation of luminaires to be possible. Due to the elevated position of the crossbeams on the lighting poles, such modifications and/or replacement of the crossbeams is both time-consuming and costly.

Accordingly, this document describes systems and methods that are directed to solving the issues described above, and/or other problems. In particular, the present invention relates to a mount adapter assembly for use with lighting fixtures on a lighting tower according to claim <NUM>. Prior art mount adapters are disclosed for example in <CIT>, <CIT> and <CIT>.

In various embodiments a mount adapter assembly for use with light fixtures on a lighting tower includes an upper mounting portion and a lower clamping portion coupled to the upper mounting portion. The upper mounting portion includes a top mounting portion wall, a first mounting portion sidewall, a second mounting portion sidewall, and a bottom mounting portion wall. The top mounting portion wall includes at least one mounting hole configured for the coupling of a light fixture to the mount adapter assembly. The lower clamping portion includes a top clamping portion wall, a first clamping portion sidewall, a second clamping portion sidewall opposite the first clamping portion sidewall, and one or more fasteners extending through both the first clamping portion sidewall and the second clamping portion sidewall so as to apply a clamping force between the first clamping portion sidewall and the second clamping portion sidewall.

Optionally, the first mounting portion sidewall, the second mounting portion sidewall or both may include an opening formed to allow access to an interior of the upper mounting portion. The lower clamping portion may be formed in an inverted U-shape. Also, the mount adapter assembly may include one or more sleeves extending between the first clamping portion sidewall and the second clamping portion sidewall. The one or more fasteners may extend through the one or more sleeves. Each fastener may have a bolt-and-nut configuration. The top clamping portion wall of the lower clamping portion may be coupled to the bottom mounting portion wall of the upper mounting portion. A space between the first clamping sidewall portion and the second clamping sidewall portion may be sized to accommodate the width of a crossbeam of the lighting tower, and a space between the top clamping portion wall and one or more fasteners may be sized to accommodate the height of the crossbeam.

According to the invention, a mount adapter assembly for use with light fixtures on a lighting tower includes an L-shaped stationary portion and a sliding portion. The L-shaped stationary portion includes a horizontally-extending top surface a vertically-extending rear sidewall. The horizontally-extending top surface includes one or more mounting holes configured for the coupling of a light fixture to the mount adapter assembly. The sliding portion includes a horizontally-extending top portion and a vertically-extending lower wall. One or more fasteners extend through both the vertically-extending rear sidewall of the L-shaped stationary portion and the vertically-extending lower wall of the sliding portion so as to apply a clamping force between the vertically-extending rear sidewall and the vertically-extending lower wall.

The horizontally-extending top surface includes elongated slots, and the horizontally-extending top portion and the vertically-extending lower wall of the sliding portion are coupled by a pair of tongues extending through a pair of the elongated slots. The pair of tongues may be configured to maintain the vertically-extending lower wall parallel relative to the vertically-extending rear sidewall. The mount adapter assembly also may include at least one additional fastener configured to extend through at least one of the elongated slots so as to secure the sliding portion relative to the L-shaped stationary portion.

Optionally, in such embodiments the mount adapter assembly may include various associated through-hole pairs formed through the respective vertically-extending lower wall and the vertically-extending rear sidewall. The through-hole pairs may be positioned vertically relative to one another, and the may be configured to allow for a pair of the fasteners to be coupled to the vertically-extending lower wall and the vertically-extending rear sidewall at various points.

In other embodiments, a mount adapter assembly for use with light fixtures on a lighting tower includes an L-shaped stationary portion and a sliding portion. The L-shaped stationary portion may include a horizontally-extending top surface and a vertically-extending rear sidewall. The vertically-extending rear sidewall includes a various through-hole pairs positioned vertically relative to one another. The horizontally-extending top surface may include one or more mounting holes configured for the coupling of a light fixture to the mount adapter assembly. The sliding portion may include a horizontally-extending top portion and a vertically-extending lower wall. The vertically-extending lower wall may include various through-hole pairs positioned relative to one another. The mount adapter assembly also may include a pair of fasteners extending through respective through-hole pairs of the vertically-extending rear sidewall of the L-shaped stationary portion and the vertically-extending lower wall of the sliding portion so as to apply a clamping force between the vertically-extending rear sidewall and the vertically-extending lower wall.

The horizontally-extending top surface includes elongated slots. The horizontally-extending top portion and the vertically-extending lower wall of the sliding portion are coupled by a pair of tongues extending through a pair of the elongated slots. The pair of tongues may be configured to maintain the vertically-extending lower wall parallel relative to the vertically-extending rear sidewall. Also, the mount adapter assembly may include at least one additional fastener configured to extend through at least one of the elongated slots so as to secure the sliding portion relative to the L-shaped stationary portion.

As used in this document, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. As used in this document, the term "comprising" means "including, but not limited to. " When used in this document, the term "exemplary" is intended to mean "by way of example" and is not intended to indicate that a particular exemplary item is preferred or required.

In this document, when terms such "first" and "second" are used to modify a noun, such use is simply intended to distinguish one item from another, and is not intended to require a sequential order unless specifically stated. The term "approximately," when used in connection with a numeric value, is intended to include values that are close to, but not exactly, the number. For example, in some embodiments, the term "approximately" may include values that are within +/- <NUM> percent of the value.

In this document, the terms "luminaire," "light fixture," "illumination device" and "lighting device" may be used interchangeably to refer to a device that includes a source of optical radiation. Sources of optical radiation may include, for example, light emitting diodes (LEDs), light bulbs, ultraviolet light or infrared sources, or other sources of optical radiation. In the embodiments disclosed in this document, the optical radiation emitted by a luminaire includes visible light. A luminaire will also include a housing, one or more electrical components for conveying power from a power supply to the device's optical radiation source, and optionally control circuitry (e.g., driver circuits). A "lighting tower" is a structure that supports multiple lighting fixtures in an above-ground location.

When used in this document, terms such as "top" and "bottom," "upper" and "lower", "inner" and "outer", or "front" and "rear," are not intended to have absolute orientations but are instead intended to describe relative positions of various components with respect to each other. For example, a first component may be an "upper" component and a second component may be a "lower" component when a device of which the components are a part is oriented in a first direction. The relative orientations of the components may be reversed, or the components may be on the same plane, if the orientation of the structure that contains the components is changed. The claims are intended to include all orientations of a device containing such components.

Referring to <FIG>, a lighting tower <NUM> in accordance with an aspect of the disclosure is illustrated. As shown, lighting tower <NUM> may include a pair of light fixtures <NUM>, with each light fixture <NUM> pivotally coupled to a base <NUM> to allow for adjustable orientation of the light fixture <NUM>. While not specifically shown, it is to be understood that each light fixture <NUM> may include, e.g., a housing, an interface plate, and an optional power supply unit, and the housing may encase various components of the light fixture such as, e.g., a set of LED modules secured to form a multi-module LED structure. However, it is to be understood that light fixtures <NUM> need not be LED-based, and may be any appropriate light-emitting device.

Lighting tower <NUM> further includes a vertically-extending light pole <NUM>, a first crossbeam <NUM>, and a second crossbeam <NUM>. Light pole <NUM> and respective crossbeams <NUM>, <NUM> may be formed of any suitable material, such as, e.g., steel, aluminum, wood, etc. Additionally, crossbeams <NUM>, <NUM> may be coupled to light pole <NUM> through any suitable attachment means such as, e.g., welding, fasteners, etc. While light fixtures <NUM> are only shown as being mounted on first crossbeam <NUM>, it is to be understood that one or more light fixtures <NUM> may also be mounted on second crossbeam <NUM>, and that additional crossbeams (not shown) may be coupled to light pole <NUM>. Alternatively, only one crossbeam may be utilized.

As described above, there is often a desire to update and/or upgrade the light fixtures associated with lighting towers without replacing the larger structural features (i.e., the light pole and/or crossbeams) of the towers. However, due to variations in mounting patterns, fixture sizes, and/or spacing of the new light fixtures, significant modifications to the existing crossbeam(s) of the tower may be needed to allow for the secure mounting of the light fixtures to the crossbeam(s). Because lighting towers in facilities such as sports fields can be significantly elevate the lights above ground, such modifications may be both time-consuming and costly. To obviate the need for such modifications, and in accordance with aspects of the present disclosure, the lighting tower <NUM> shown in <FIG> provides a mount adapter assembly <NUM> for the coupling of each light fixture <NUM> without the need for modifications to the crossbeams, as will be described in further detail below.

Referring to <FIG>, mount adapter assembly <NUM> in accordance with an aspect of the disclosure is shown in greater detail. Mount adapter assembly <NUM> may be formed of any appropriate material or combination of materials such as, e.g., aluminum, steel, plastic, etc. Mount adapter assembly <NUM> includes an upper mounting portion <NUM> and a lower clamping portion <NUM>. Upper mounting portion <NUM> is configured to support the mounting of, e.g., the base <NUM> of a lighting fixture <NUM>, as shown in <FIG>, while lower clamping portion <NUM> is configured to secure the mount adapter assembly <NUM> to an existing crossbeam without the need for modification to the crossbeam.

Upper mounting portion <NUM> includes a top mounting portion wall <NUM>, a first mounting portion sidewall <NUM>, a second mounting portion sidewall <NUM>, and a bottom mounting portion wall <NUM>. An opening <NUM> may be formed between the top mounting portion wall <NUM>, first mounting portion sidewall <NUM>, second mounting portion sidewall <NUM>, and bottom mounting portion wall <NUM> such that the interior of upper mounting portion <NUM> is visible and accessible. Additionally, second mounting portion sidewall <NUM> may include an opening <NUM> formed therein to allow even further visibility and access into the upper mounting portion <NUM>. While not shown in <FIG>, it is to be understood that first mounting portion sidewall <NUM> may also include an opening, and/or there may be no opening <NUM> formed in second mounting portion sidewall <NUM>.

The top mounting portion wall <NUM> may include a mounting hole <NUM>, with the mounting hole <NUM> sized and configured to receive, e.g., mounting hardware utilized to secure the base <NUM> of a lighting fixture <NUM>. While only one mounting hole <NUM> is shown in <FIG>, it is to be understood that additional mounting holes in a plurality of different patterns may be incorporated into top mounting portion wall <NUM>, enabling lighting fixtures <NUM> having various mounting schemes to be coupled to the upper mounting portion <NUM>. The mounting hardware utilized to secure the base <NUM> may be any appropriate hardware such as, e.g., bolts, nuts, screws, etc. One or more of the openings <NUM>, <NUM> may be utilized by a utility worker or technician to easily access a portion of the mounting hardware (e.g., a nut) so as to ensure a secure connection between the base <NUM> and the top mounting portion wall <NUM>.

Referring still to <FIG>, upper mounting portion <NUM> is shown as being coupled to lower clamping portion <NUM>. The coupling between upper mounting portion <NUM> and lower clamping portion <NUM> may be achieved through any appropriate method such as, e.g., welding, fastener(s), adhesive(s), etc. Lower clamping portion <NUM> may be arranged in a substantially inverted, U-shaped configuration, including a top clamping portion wall <NUM>, a first clamping portion sidewall <NUM>, and second clamping portion sidewall <NUM>. The U-shaped configuration of lower clamping portion <NUM> may be achieved through any appropriate method such as, e.g., bending, stamping, welding, molding, etc. A pair of fasteners 34A, 34B are shown as extending through a pair of respective sleeves 35A, 35B, with the sleeves 35A, 35B disposed between first clamping portion sidewall <NUM> and second clamping portion sidewall <NUM>. The fasteners 34A, 34B may be any appropriate fastener such as, e.g., a bolt-and-nut combination, a bar with a receptacle into which a securing pin is placed, or another fastening structure. Accordingly, as the fasteners 34A, 34B are tightened, a slight clamping force may be applied to both the first clamping portion sidewall <NUM> and the second clamping portion sidewall <NUM>. In this way, the lower clamping portion <NUM> may be removably secured to, e.g., crossbeam <NUM>, as is shown in <FIG>. While a pair of fasteners 34A, 34B and a pair of sleeves 35A, 35B are shown, it is to be understood that fewer than two or more than two fasteners and/or sleeves may be utilized. Also, the sleeves 35A, 35B are optional, and may be omitted in some embodiments.

As shown in <FIG>, the mount adapter assemblies <NUM> are capable of being mounted on a pre-existing crossbeam <NUM> without the need for modifications to the crossbeam <NUM> itself. The crossbeam <NUM> may be of a conventional size/shape (e.g., <NUM> inches tall by <NUM> inches wide), and thus the spacing between the first clamping portion sidewall <NUM> and the second clamping portion sidewall <NUM> may be sized accordingly, as may the spacing between the top clamping portion wall <NUM> and the sleeves 35A, 35B. It is to be understood that mount adapter assembly <NUM> is not limited to one specific size and/or shape, and may be customized to fit various crossbeams having various dimensions.

Next, referring to <FIG>, a lighting configuration <NUM> in accordance with another aspect of the disclosure is illustrated. Unlike mount adapter assembly <NUM> described above with respect to <FIG>, which includes a first clamping portion sidewall <NUM> and a second clamping portion sidewall <NUM> being positioned at a relatively fixed distance apart, lighting configuration <NUM> utilizes a mount adapter assembly <NUM> having an adjustable-width lower clamping portion. With such a configuration, mount adapter assembly <NUM> is capable of being utilized on crossbeams having various widths.

Referring to <FIG>, mount adapter assembly <NUM> is shown in greater detail. Mount adapter assembly <NUM> includes an L-shaped stationary portion <NUM> having a horizontally-extending top surface <NUM> and a vertically-extending rear sidewall <NUM>. The L-shaped stationary portion <NUM> may be formed of any appropriate material or combination of materials such as, e.g., aluminum, steel, plastic, etc., and may be formed by any appropriate method such as, e.g., bending, stamping, welding, molding, etc..

Movably coupled to L-shaped stationary portion <NUM> is a sliding portion <NUM>. Sliding portion <NUM> includes a horizontally-extending top portion <NUM> and vertically-extending lower wall <NUM>. Top portion <NUM> and lower wall <NUM> are spaced apart by the approximate thickness of top stationary portion wall <NUM>, but are coupled together by way of tongues <NUM>. One end of each tongue <NUM> is affixed or otherwise attached to the lower wall <NUM>, while the other end of each tongue <NUM> is affixed or otherwise attached to the top portion <NUM>. For example, one end of each tongue <NUM> may form a respective mortice-and-tenon joint 59A, 59B with the top portion <NUM>. While only one tongue <NUM> is shown in <FIG> (associated with mortice-and-tenon joint 59A), it is to be understood that a second tongue <NUM> is also present (and associated with mortice-and-tenon joint 59B).

Top stationary portion wall <NUM> of L-shaped stationary portion <NUM> further includes a plurality of elongated slots 54A, 54B, 54C, 54D. Elongated slots 54A, 54B, 54C, 54D may be configured to enable sliding portion <NUM> to move horizontally relative to L-shaped stationary portion <NUM>, thereby allowing for the distance between vertically-extending rear sidewall <NUM> and vertically-extending lower wall <NUM> to be varied. As is shown in <FIG>, the tongues <NUM> may extend through two of the elongated slots (i.e., slots 54B and 54C), while a pair of fasteners 52A, 52B may extend through the other two elongated slots (i.e., slots 54A and 54D) such that the sliding portion <NUM> is capable of being secured at a desired position relative to the elongated slots 54A, 54B, 54C, 54D formed in the L-shaped stationary portion <NUM>. The fasteners 52A, 52B may be any appropriate fastener such as, e.g., a bolt-and-nut combination, a bar with a receptacle into which a securing pin is placed, or another fastening structure. It is to be understood that additional fasteners beyond fasteners 52A, 52B may be utilized to secure sliding portion <NUM>. Specifically, top portion <NUM> may include additional through-holes 58A, 58B position and sized for the insertion of additional fasteners. Alternatively, one or both of the fasteners 52A, 52B could be inserted through the through-holes 58A, 58B, as opposed to the positions as shown in <FIG>.

The tongues <NUM> not only act to couple the top portion <NUM> and lower wall <NUM> of the sliding portion <NUM>, but they also act to square (or hold parallel) the lower wall <NUM> relative to the vertically-extending rear sidewall <NUM>, regardless of the position of the sliding portion <NUM> relative to the elongated slots 54A, 54B, 54C, 54D. That is, as the tongues <NUM> extend through a pair of elongated slots 54B, 54C, any twisting of the sliding portion <NUM> relative to the L-shaped stationary portion <NUM> can be substantially avoided.

A distal end region of the horizontally-extending top surface <NUM> may include a plurality of mounting holes <NUM>, <NUM>, with the mounting holes <NUM>, <NUM> sized and configured to receive, e.g., mounting hardware utilized to secure the base <NUM> of a lighting fixture <NUM>. While a single center mounting hole <NUM> and four surrounding mounting holes <NUM> are shown in <FIG>, it is to be understood that additional mounting holes in a plurality of different patterns may be incorporated into horizontally-extending top surface <NUM>, enabling lighting fixtures <NUM> having various mounting schemes to be coupled to mount adapter assemblies <NUM>. The mounting hardware utilized to secure the base <NUM> may be any appropriate hardware such as, e.g., bolts, nuts, screws, etc..

Referring still to <FIG>, a pair of fasteners 51A, 51B are shown as extending through both the vertically-extending rear sidewall <NUM> and the lower wall <NUM>. The fasteners 51A, 51B may be any appropriate fastener such as, e.g., a bolt-and-nut combination, a bar with a receptacle into which a securing pin is placed, or another fastening structure. Although not shown in <FIG>, the fasteners optionally may be held within sleeves such as those shown in the embodiment of <FIG>. Accordingly, as the fasteners 51A, 51B are adjusted, the sliding portion <NUM> is capable of moving relative to the L-shaped stationary portion <NUM>, and a clamping force may be applied to both the vertically-extending rear sidewall <NUM> and the lower wall <NUM> over, e.g., a crossbeam <NUM>, as is shown in <FIG>. In this way, the mount adapter assemblies <NUM> are capable of being mounted on a pre-existing crossbeam <NUM> without the need for modifications to the crossbeam <NUM> itself. Additionally, the mount adapter assemblies <NUM> are configured so as to be usable with crossbeams of varying widths, thereby eliminating the need for multiple versions of mount adapter assemblies for specific crossbeam widths.

Referring now to <FIG>, a mount adapter assembly <NUM> in accordance with another aspect of the disclosure is illustrated. Similar to mount adapter assembly <NUM> described above with respect to <FIG>, mount adapter assembly <NUM> is configured to be usable on crossbeams of varying widths. However, unlike mount adapter assembly <NUM>, mount adapter assembly <NUM> is also configured to be usable on crossbeams having varying heights, as will be set forth in further detail below.

Mount adapter assembly <NUM> includes an L-shaped stationary portion <NUM> having a horizontally-extending top surface <NUM> and a vertically-extending rear sidewall <NUM>. The L-shaped stationary portion <NUM> may be formed of any appropriate material or combination of materials such as, e.g., aluminum, steel, plastic, etc., and may be formed by any appropriate method such as, e.g., bending, stamping, welding, molding, etc..

Movably coupled to L-shaped stationary portion <NUM> is a sliding portion <NUM>. Sliding portion <NUM> includes a horizontally-extending top portion <NUM> and a vertically-extending lower wall <NUM>. Top portion <NUM> and lower wall <NUM> are spaced apart by the approximate thickness of top stationary portion wall <NUM>, but are coupled together by way of tongues <NUM>. One end of each tongue <NUM> is affixed or otherwise attached to the lower wall <NUM>, while the other end of each tongue <NUM> is affixed or otherwise attached to the top portion <NUM>. For example, one end of each tongue <NUM> may form a respective mortice-and-tenon joint 79A, 79B with the top portion <NUM>. While only one tongue <NUM> is shown in <FIG> (associated with mortice-and-tenon joint 79A), it is to be understood that a second tongue <NUM> is also present (and associated with mortice-and-tenon joint 79B).

Top stationary portion wall <NUM> of L-shaped stationary portion <NUM> further includes a plurality of elongated slots 74A, 74B, 74C, 74D. Elongated slots 74A, 74B, 74C, 74D may be configured to enable sliding portion <NUM> to move horizontally relative to L-shaped stationary portion <NUM>, thereby allowing for the distance between vertically-extending rear sidewall <NUM> and vertically-extending lower wall <NUM> to be varied. As is shown in <FIG>, the tongues <NUM> may extend through two of the elongated slots (i.e., slots 74B and 74C), while a pair of fasteners 72A, 72B may extend through the other two elongated slots (i.e., slots 74A and 74D) such that the sliding portion <NUM> is capable of being secured at a desired position relative to the elongated slots 74A, 74B, 74C, 74D formed in the L-shaped stationary portion <NUM>. The fasteners 72A, 72B may be any appropriate fastener such as, e.g., a bolt-and-nut combination, a bar with a receptacle into which a securing pin is placed, or another fastening structure. It is to be understood that additional fasteners beyond fasteners 72A, 72B may be utilized to secure sliding portion <NUM>. Specifically, top portion <NUM> may include additional through-holes 78A, 78B position and sized for the insertion of additional fasteners. Alternatively, one or both of the fasteners 72A, 72B could be inserted through the through-holes 78A, 78B, as opposed to the positions as shown in <FIG>.

The tongues <NUM> not only act to couple the top portion <NUM> and lower wall <NUM> of the sliding portion <NUM>, but they also act to square the lower wall <NUM> relative to the vertically-extending rear sidewall <NUM>, regardless of the position of the sliding portion <NUM> relative to the elongated slots 74A, 74B, 74C, 74D. That is, as the tongues <NUM> extend through a pair of elongated slots 74B, 74C, any twisting of the sliding portion <NUM> relative to the L-shaped stationary portion <NUM> can be substantially avoided.

Referring still to <FIG>, a pair of fasteners 71A, 71B are shown as extending through both the vertically-extending rear sidewall <NUM> and the lower wall <NUM>. The fasteners 71A, 71B may be any appropriate fastener such as, e.g., a bolt-and-nut combination, a bar with a receptacle into which a securing pin is placed, or another fastening structure. Although not shown in <FIG>, the fasteners optionally may be held within sleeves such as those shown in the embodiment of <FIG>. Accordingly, as the fasteners 71A, 71B are adjusted, the sliding portion <NUM> is capable of moving relative to the L-shaped stationary portion <NUM>, and a clamping force may be applied to both the vertically-extending rear sidewall <NUM> and the lower wall <NUM> over, e.g., a crossbeam <NUM>. In this way, the mount adapter assemblies <NUM> are capable of being mounted on a pre-existing crossbeam <NUM> without the need for modifications to the crossbeam <NUM> itself. Additionally, the mount adapter assemblies <NUM> are configured so as to be usable with crossbeams of varying widths, thereby eliminating the need for multiple versions of mount adapter assemblies for specific crossbeam widths.

Additionally, as noted above, mount adapter assemblies <NUM> are also configured to be usable with crossbeams of varying heights. Specifically, mount adapter assemblies <NUM> include a plurality of aligned through-hole pairs in both the vertically-extending rear sidewall <NUM> and the lower wall <NUM> to accommodate not only crossbeams of varying widths, but also varying heights. As is shown in <FIG>, the vertically-extending rear sidewall <NUM> includes associated pairs of through-holes 80A, 80B and 82A, 82B, which are horizontally aligned with respective associated pairs of through-holes 81A, 81B and 83A, 83B in the lower wall <NUM>. In this way, the fasteners 71A, 71B can be selectively inserted through an appropriate associated pair of through-holes in each of the vertically-extending rear sidewall <NUM> and the lower wall <NUM>, dependent upon the height of the crossbeam upon which mount adapter assembly <NUM> is to be secured. Accordingly, mount adapter assemblies <NUM> can be configured for use on crossbeams of many sizes, including crossbeams of varying widths and heights.

Claim 1:
A mount adapter assembly (<NUM>) for use with light fixtures (<NUM>) on a lighting tower, comprising:
an L-shaped stationary portion (<NUM>), the L-shaped stationary portion comprising:
a horizontally-extending top surface (<NUM>), and
a vertically-extending rear sidewall (<NUM>),
wherein the horizontally-extending top surface (<NUM>) includes at least one mounting hole (<NUM>,<NUM>) configured for the coupling of a light fixture (<NUM>) to the mount adapter assembly (<NUM>) and a plurality of elongated slots (54A-D);
a sliding portion (<NUM>), the sliding portion comprising:
a horizontally-extending top portion (<NUM>), and
a vertically-extending lower wall (<NUM>); and
at least one fastener (51A-B) extending through both the vertically-extending rear sidewall (<NUM>) of the L-shaped stationary portion (<NUM>) and the vertically-extending lower wall (<NUM>) of the sliding portion (<NUM>) so as to apply a clamping force between the vertically-extending rear sidewall and the vertically-extending lower wall, and wherein the horizontally-extending top portion (<NUM>) and the vertically-extending lower wall (<NUM>) of the sliding portion are coupled by a pair of tongues (<NUM>) extending through a pair of the elongated slots (54A-D).