# Patent

## Title
Rotating light emitting diode driver mount

## Abstract

A lighting apparatus includes a power housing that is defined by a front face, a back face and a plurality of sidewalls. A plurality of cooling fins extends from the power housing, and a plurality of drivers is housed by the power housing and is operable to power a plurality of LEDs. An LED housing is rotatably coupled to and thermally separated from the power housing, and the LED housing supports the plurality of LEDs.

## Background
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation application of U.S. patent application Ser. No. 14/535,924, filed on Nov. 7, 2014, now pending, the disclosure of which is hereby incorporated by reference.


TECHNICAL FIELD
This disclosure relates to lighting apparatuses, and more particularly to light emitting diode (LED) lighting apparatuses for high mast applications, and even more particularly to LED lighting apparatuses with a driver mount for increased heat dissipation and surface area lighting.
BACKGROUND OF THE DISCLOSURE
The life span of an LED lighting apparatus is generally not the LED component itself but, instead, is the driver or the power source providing power to the LED component. One of the factors that limit the life span of a driver is overheating. The LED components and the driver each by itself creates a large amount of heat. Together, however, the heat can become so great that the heat starts to impact the ability of elements inside a driver housing, such as the driver, to function properly, which eventually leads to failure of the driver or the power source.
High mast applications that use LED lighting may have several sets of LED panels each set powered or driven by its own driver. A non-limiting example of LED lighting used in high mast applications is the lighting of roadways at night. Maintaining suitable temperatures to preserve the life span of the drivers and other heat sensitive elements used in these lighting apparatuses becomes difficult as the number of LED sets and respective drivers are needed. Designing LED lighting apparatuses for high mast uses present challenges given the operating environment such as the extreme height above the ground or their operation in remote locations. Extending the life of the driver by reducing the driver's heat exposure is desirable.
SUMMARY
In a first aspect, there is provided a power source housing for use with a high mast lighting apparatus, the housing having a front face and an opposing, back face. The front face closest to a back face of a light emitting diode (LED) housing. The housing further includes at least two opposing side faces extending from the front face to the back face and power housing cooling fins extending outward from the at least two opposing side faces.
In certain embodiments, the front face length is less than a back face length.
In another embodiment, the two opposing side faces create an acute angle relative to the back face of the LED housing and the front face of the power housing.
In yet another embodiment, the plurality of cooling fins extending from the at least two opposing side faces are passive cooling fins.
In some embodiments, the housing further comprises a plurality of cooling fins extending from the back face of the LED housing, wherein the two opposing side faces create an acute angle relative to the back face of the LED housing and the front face of the power housing, causing air heated from the LED housing to dissipate from the plurality of cooling fins extending from the back face of the LED housing upward toward the power housing and the power housing cooling fins thereby increasing heat transfer away from the LED housing and the power source housing.
In certain embodiments, the housing further comprises a cord aperture for allowing passage of a cord therethrough, and a cord grip for wrapping around a cord to prevent air from passing into an internal space formed by the power housing, thereby preventing the internal space from increasing in temperature due to air heated by the LED housing entering the internal space of the power housing via the cord aperture.
In a second aspect, there is provided a light emitting diode (LED) high mast lighting apparatus having a LED housing having a panel configured for receiving a plurality of LEDs. The apparatus further includes a power housing separate from and coupled to the LED housing with a gap between the LED housing and the power housing.
In certain embodiments, the lighting apparatus further comprises an extension member connected at one end to the power housing and at another end to the LED housing to create the gap between the housings.
In another embodiment, the lighting apparatus further comprises at least one LED driver contained in the internal space formed by the power housing; LED housing cooling fins positioned on the LED housing and facing the power housing; and power housing cooling fins positioned on the power housing. The LED housing cooling fins and the power housing cooling fins form an acute angle and the extension member between the LED housing and the power housing reduces heat transfer between the LED housing and the internal space formed by the power housing via convection and conduction.
In yet another embodiment, the lighting apparatus further comprises two or more LED drivers, each LED driver positioned at opposite sides of the power housing to maximize heat dissipation inside the power housing.
In some embodiments, the LED housing swivels relative to the power housing.
In a third aspect, there is provided a lighting apparatus for use with a light emitting diode (LED) panel, having an LED panel configured to receive a plurality of LED lights, a power source, and an extension member. The extension member is connected to the LED panel at a first end and to the power source at a second, opposing end. The extension member is rotatable, thereby allowing the LED panel to rotate up to 360 degrees about an axis.
In certain embodiments, the lighting apparatus further includes a mast, wherein the LED panel and the power source are connected to the mast.
In another embodiment, the lighting apparatus further comprises a plurality of cooling fins extending from the LED panel.
In yet another embodiment, the lighting apparatus further comprises a plurality of cooling fins extending from a power housing containing the power source.
In some embodiments, the lighting apparatus further comprises a plurality of cooling fins extending from the LED panel and a plurality of cooling fins extending from a power housing containing the power source.
In a fourth aspect, there is provided a light emitting diode (LED) high mast lighting apparatus, having a LED housing, a power source for providing power to the LED housing, and an extension member extending between the LED housing and the power source. The extension member is configured to reduce thermal conduction between the LED housing and the power source.
In certain aspects, the extension member further comprises a first end attached to a back side of the LED housing and an opposing, second end attached to the front side of the power housing.
In one embodiment, the lighting apparatus further comprises a cord extending at least the length of the extension member configured to provide power from the power source to the LED lights.
In another embodiment, the length of the extension member is in a range of between about one inches and four inches.
In yet another embodiment, the lighting apparatus further comprises a power housing containing the power source. The power housing includes a front face and an opposing, back face, the front face closest to a back face of the LED housing, wherein the LED housing has a front face and the opposing, back face. The power housing further including at least two opposing side faces extending from the front face to the back face of the power housing and cooling fins extending outward from the at least two opposing side faces of the power housing. The front face of the power housing has a length less than a length of the back face of the power housing.
Other aspects, features, and advantages will become apparent from the following detailed description when taken in conjunction with the accompanying drawings, which are a part of this disclosure and which illustrate, by way of example, principles of the inventions disclosed.



BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings facilitate an understanding of the various embodiments.
FIG. 1 is a perspective view of a high mast lighting system.
FIG. 2 is a top, perspective view of a LED lighting apparatus for use in a high mast light application, such as the high mast lighting system illustrated in FIG. 1.
FIG. 3 is a bottom, perspective view of the LED lighting apparatus of FIG. 1.
FIG. 4A is a cross-sectional view of an LED lighting apparatus according to one embodiment.
FIG. 4B is a cross-sectional, perspective view of a power housing according to the LED lighting apparatus of FIG. 4A.
FIG. 4C is a perspective view of a LED housing according to the LED lighting apparatus of FIG. 4A
FIG. 5 is a side view of one embodiment of an LED lighting apparatus illustrating a thermal flow path.
FIG. 6 is a side view of an embodiment of an LED lighting apparatus illustrating a thermal flow path.



DETAILED DESCRIPTION
Referring to FIG. 1, an exemplary embodiment of a high mast lighting system 100 is presented. The high mast lighting system 100 illustrated includes a mast 102, a hub 104 positioned on a top portion 103 of the mast 102, a plurality of extension members 106 attached to the hub 104, and a plurality of light emitting diode (LED) lighting apparatuses 108 attached to the extension members 106. The high mast lighting system 100 may be used to light roadways, overpasses or highways, and in one embodiment, the high mast lighting system 100 may be adapted for use in sports lighting, arena lighting, security lighting, and track lighting. The high mast lighting system 100 illustrated is a non-limiting embodiment of a high mast lighting system configured and operable to provide uniform light distribution with less glare and less weight than traditional high-intensity discharge (HID) lighting components with a longer service life than comparable LED lighting apparatuses. Uniform light distribution with less glare increases safety, components with a lighter weight generally reduce production costs, and a longer service life reduces service costs especially given that these high mast lighting systems 100 are difficult to service due to the LED lighting apparatuses' 108 height above the ground, and in some instances, the system's 100 deserted locations.
The mast 102 includes the top portion 103 and a bottom portion 105. The bottom portion 105 is securely attached to a ground area or base 101, and the top portion 103 is securely attached to the hub 104. Extending outward from the hub 104 is the plurality of extension members 106, which may also be referred to as tenons. The plurality of extension members 106 are cantilevered from the hub 104. In some aspects, the extension members 106 are attached directly to the mast 102 and cantilevered therefrom. It should be appreciated by one of ordinary skill in the art that only one of the extension member 106 and corresponding LED lighting apparatus 108 may be deployed. Likewise, in some aspects the mast 102, the hub 104, or a combination thereof may not be necessary as other structures may be used as an attachment mechanism for the plurality of extension members 106 and corresponding LED lighting apparatuses 108, or simply the LED lighting apparatuses 108 by itself.
Generally, the positioning of the extension members 106 depends on the terrain or topographical layout of an area 101a to be illuminated so that the area 101a to be illuminated has uniform light distribution and reduced glare. Therefore, the positioning of the extension members 106 may be different depending on the layout of roadways or when the plurality of extension members 106 are used to illuminate intersections, overpasses, or other roadway configurations. Moreover, the positioning of the plurality of extension members 106 may also be different when used with the plurality of LED lighting apparatuses 108 when used in stadium lighting. The terrain or topographical layout of the area 101a to be illuminated, typically determines the positioning of the extension members 106 and the corresponding LED lighting apparatuses 108 so that the LED lighting apparatuses 108 can provide uniform light distribution with reduced glare. The system 100 described herein provides this flexibility in configuration.
Each extension member 106 extends along a longitudinal axis 128. In one aspect, the plurality of extension members 106 extends along the respective longitudinal axis 128 radially from the hub 104. In some aspects, the plurality of extension members 106 forms a polar array such that each of the plurality of extension members 106 lies within the same plane. In this aspect, the plurality of extension members 106 may be substantially horizontal to the ground area 101 or the area 101a to be illuminated. In another aspect, the plurality of extension members 106 may extend radially from the hub 104 at various angles. In this aspect, one extension member 106 may be positioned higher relative to another extension member 106. This configuration may be deployed when the topographical layout of the area 101a to be illuminated varies; e.g., an overpass.
The extension members 106 may be equal distance from each other as shown in FIG. 1 or, alternatively, some of the extension members 106 may be positioned in clusters such that not all the extension members 106 are equal distance from each other. In one non-limiting embodiment, this configuration may be used when the high mast lighting system 100 is positioned between two separate roadways and the high mast lighting system 100 is used to illuminate both roadways. In this aspect, the extension members 106 may be positioned in a first cluster over one of the roadways and a second cluster over the other roadway. Again, the positioning of the extension members 106 depends on the terrain or topographical layout of the area 101a to be illuminated.
Referring to FIGS. 1-2, attached to each extension member 106 is the corresponding LED lighting apparatus 108. Each of the LED lighting apparatuses 108 includes a driver or power housing 110 and a LED housing 112. In an exemplary, non-limiting embodiment, the power housing 110 has a longitudinal axis 129 and the LED housing 112 has a longitudinal axis 131. In some aspects, the longitudinal axis 129 of the power housing 110 is parallel with the longitudinal axis 131 of the LED housing 112, and the longitudinal axis 129 of the power housing 110 is co-axial with the longitudinal axis 128 of the extension member 106. An aperture 114 is formed in the power housing 110 for receiving one end of the extension member 106. In some aspects, the LED lighting apparatus 108 is angled relative to the extension member 106 such that the longitudinal axis 129 of the LED lighting apparatus 108 is angled relative to the longitudinal axis 128 of the extension member 106. In these aspects, the aperture 114 may still receive the extension member 106. Connecting components (not shown) that attach the extension member 106 to the LED lighting apparatus 108 may be operable to allow the LED lighting apparatus 108 to be positioned in an angled orientation relative to the extension member 106. It should be appreciated that the extension members 106 and corresponding LED lighting apparatuses 108 may extend from the hub 104 or the portion 103 of the mast 102 in any number of configurations.
As previously mentioned, the LED lighting apparatus 108 includes the driver or power housing 110 and the LED housing 112. In one embodiment, the power housing 110 includes a transverse axis 127 that is perpendicular to the longitudinal axis 129 of the power housing 110. Likewise, the LED housing 112 has a transverse axis 126 that is perpendicular to the longitudinal axis 131 of the LED housing 112. The transverse axis 127 of the power housing 110 is parallel to the transverse axis 126 of the LED housing 112. In this embodiment, the power housing 110 further includes a centerline axis 124, and the LED housing 112 further includes a centerline axis 125. The centerline axis 124 of the power housing 110 is generally co-linear with the centerline axis 125 of the LED housing 112. The centerline axes 124, 125 are generally perpendicular to the transverse axes 126, 127 and the longitudinal axes 129, 131. Both of the housings 110, 112 are illustrated and described as having a polygonal construction; however, the housings 110, 112 are not limited to polygonal construction and could, for example, have rounded aspects to the construction or take the form of a number of other shapes.
Referring now to FIGS. 2-5, the LED lighting apparatus 108 will be described in more detail. The LED lighting apparatus 108 includes the driver or power housing 110 and the LED housing 112. The power housing 110 is separate and thermally isolated from but connected to the LED housing 112. The power housing 110 is connected to the LED housing 112 in a base-up position, meaning that the power housing 110 is positioned above the LED housing 112. The LED housing 112 is operable to swivel relative to the power housing 110. In an aspect, the LED housing 112 is operable to rotate up to 360 degrees about its central axis 125.
In one embodiment, the LED housing 112 is movable so that it can be angled relative to the driver housing 110 and, therefore, align with a horizontal plane, the horizontal plane generally representing the area 101a to be illuminated. Contemporary LED High Mast lighting configurations do not allow the light source to be angled, rotated, or swivel relative to the driver housing. In the LED applications where an LED array is rotatable, the LED and heat sink are rotated within an enclosure. The enclosure traps heat, shortening LED lifespan and reducing LED efficiency. It is advantageous, however, for the light source or LED panel to be able to swivel, rotate, or be angled when used to illuminate the area 101a so as to provide better illumination and reduced glare.
In some aspects, a number of connectors (not shown) may be implemented for allowing various positioning of the LED lighting apparatus 108. There may be connectors located at the hub 104, between the hub 104 and the extension member 106, between the extension member 106 and the lighting assembly 108, between the power housing 110 and the LED housing 112, or a combination thereof.
An extension member 148 attaches the power housing 110 to the LED housing 112. The extension member 148, in one non-limiting embodiment, is an integral part of the LED housing 112. In this embodiment, the extension member 148 may rotate with the LED housing 112. In some aspects, however, the extension member 148 includes a first end 150 connected to the LED housing 112 and an opposing second end 152 connected to the driver housing 110. The extension member 148 extends between the driver housing 110 and the LED housing 112, creating a junction 133 therebetween. The junction 133 forms a gap 132 that puts distance between the driver housing 110 and the LED housing 112. In one aspect, the extension member 148 or the gap 132 functions to provide thermal isolation between the power housing 110 and the LED housing 112. The extension member 148 reduces heat transfer between the LED housing 112 and the power housing 110 via convection and conduction by providing separation between the two housings 112, 110 via the gap 132. In operation, the extension member 148 and the gap 132 help control the operating temperatures of both the LEDs 118 and the drivers 130 to temperatures that allow maximum efficiency. In a non-limiting, illustrative embodiment, the extension member 148 has a length in a range of about one inch to four inches. In some aspects, the gap 132 creates a distance between the power housing 110 and the LED housing 112 in a range of about one inch to four inches. The disclosed length of the extension member 148 and the distance created by the gap between the power housing 110 and the LED housing 112 is for illustrative purposes only and one having skill in the art will appreciate other lengths or distances may be utilized; for example, the length or the distance may be 0.25 inches, 0.5 inches, 1 inch, 2 inches, 3 inches, 4 inches, 5 inches, or more.
Still referring to FIGS. 2-5, the driver or power housing 110 houses the components that are used to power the LED components associated with the LED housing 112. The power housing 110 includes a front face 122 and an opposing back face 120. The back face 120 of the driver housing 110 may have a cover 120a. One or more attachment members 144 may be used to secure the cover 120a to the back face 120. In one non-limiting embodiment, the one or more attachment members 144 may be bolts. At least two opposing side faces, comprising a first side wall 136 and an opposing second side wall 138 extend between the front face 122 and the back face 120. Power housing cooling fins 140 extend outward from the first side wall 136 and the second side wall 138. The power housing cooling fins 140, in some aspects, extend outward from other portions of the power housing 110. The power housing cooling fins 140 are not limited to extending outward from only the first side wall 136, the second side wall 138, or combination thereof. The power housing cooling fins 140 are passive cooling fins that act as a heat sink for heat generated by components in the power housing 110. As will be discussed in more detail below, the power housing cooling fins 140 further aid in dissipating heat that is generated from the LED housing 112, radiating toward or rising into the power housing 110.
In one embodiment, the front face 122 of the power housing 110 has a length, L2, that is less than a length, L1, of the back face 120 of the power housing 110. In certain aspects the two opposing side faces, i.e., the first side wall 136 and the second side wall 138 form an acute angle 142 relative to the front face 122 of the power housing 110. The power housing 110 forms an internal space or compartment 146 that houses a power source 154. The power source 154 includes at least one or more drivers 130, which may also be referred to as ballasts. The power source 154 may further include a surge protector 134 and a terminal block assembly 135. Further included in the internal space 146 of the driver housing 110 is a cord aperture 156 for receiving a cord 157 (only partially shown) from the LED housing 112 and a cord grip 158 for gripping the cord to thermally isolate the portion of the cord 157 connected to the driver housing 110 from the portion of the cord 157 associated with the LED housing 112. The cord grip 158 thermally isolates the cord by preventing heated air from traveling through the cord aperture 156 along the outer surface of the cord 157. In other words, the cord grip 158 prevents the temperature in the internal space 146 from increasing via convection from air heated by the LED housing 112.
In certain aspects, the drivers 130 are positioned on the first and second sidewalls 136, 138. When more than one driver 130 is utilized, the drivers 130 may be mounted on different side walls. In one aspect, the drivers 130 are mounted in the driver housing 110 on the first and second sidewalls 136, 138 with the passive cooling fins 140 extending from the other side of the respective side wall. The drivers 130 are separated from each other on opposing walls of the housing 110 to lower the thermal heat density by minimize the heating of one driver 130 by heat generated by another driver 130, i.e., keeping the heat generated by one driver 130 from increasing the temperature of another driver 130. The power housing cooling fins 140 may be cast as part of the power housing 110. In one aspect, power housing cooling fins 140 provide heat dissipation for the power housing 110 by acting as a heat sink for heated air trapped in the internal space or compartment 146. In another aspect, the drivers 130 share the same wall with the power housing cooling fins 140, the drivers 130 being positioned opposite the power housing cooling fins 140, so that heat generated by the drivers 130 has a direct conduction path to the power housing cooling fins 140 and, thus, the external environment, which promotes conductive heat transfer out of the power housing 110. This arrangement helps prevent heat generated by the drivers 130 from collecting in the internal space 146 via convection. The air in the internal space or compartment 146 is heated because the drivers 130 and other power supply components contained within the power housing 110 generate heat. Thus, in some aspects, the drivers 130 share the same side wall as the power housing cooling fins 140.
The sidewalls 136, 138 are typically angled relative to the LED housing 112 to help dissipate heat via convection from the cooling fins 140. Likewise, the cooling fins 140 extending from the driver housing 110 are angled relative to the LED housing 112 in a manner that helps dissipate heat radiated into the power housing 110 from the LED housing 112 by providing a thermal pathway 170 for heat dissipation (see FIG. 5). In operation, air heated by the LED housing 112 radiates toward the power housing 110 because the power housing 110 is positioned above the LED housing 112. The angled or inclined orientation of the sidewalls 136, 138, the cooling fins 140, or combination thereof, prevents heated air from being trapped between the two housings 110, 112 by providing the thermal pathway 170. In one aspect, not shown, the at least two opposing side faces 136, 138 may be vertical, i.e., not angled relative to the LED housing 112, with the cooling fins 140 extending from the at least two opposing side face 138, 138, the cooling fins 140 being angled themselves. It should be appreciated, however, that angling the sidewalls 136, 138 is beneficial as it allows the drivers 130 to also be angled, ensuring that 100% of the driver cooling fins 140 is exposed to the upward airflow from the LED housing 112—while the upward airflow from the LED housing 112 is warm air, the upward airflow increases the thermal transfer rate of heat away from the drivers 130 because air wants to uniformly flow through the driver cooling fins 140.
The LED housing 112 has a front face 160 and an opposing back face 162. When assembled, the back face 162 of the LED housing 112 is closest to the front face 122 of the power housing 110. In some aspects, the sidewalls 136, 138 form an acute angle such as acute angle 142 relative to the back face 162 of the LED housing 112. A plurality of LED housing cooling fins 164 extend from the back face 162 of the LED housing 112 and function as a heat sink for heat generated by the LED housing 112. The plurality of LED housing cooling fins 164 are directed toward the power housing 110.
The LED housing 112 further includes a number of LEDs panels 116 on the front face 160 with each LED panel 116 comprising one or more LEDs 118. The LED panels 116 are powered by components in the driver housing 110. Generally, for each LED panel 116 there is a corresponding driver 130 contained in the driver housing 110. The LED housing 112 and the LED panels 116 are configured to provide uniform light distribution with less glare and less weight than traditional high-intensity discharge (HID) lighting components. The LED panels 116 may be arranged in any shape or size. Lights can be eliminated selectively to form a particular shape or can be utilized to compensate for lights that are not functioning.
Heat from the LED housing 112 is generated when electrical current is not converted into light emitted from the LEDs 118. In some aspects, about 75% of energy run-through the LED is converted to heat. The generated heat causes the temperature around the LEDs 118 and the LED housing 112 to increase. Increased temperatures may contribute to reduced lumen output from the LEDs 118 and shorten the LEDs 118 service life. Likewise, if the heat generated by the LED housing 112 is not dissipated away from the power housing 110, the heat generated by the LED housing 112 may affect the service life of the drivers 130 contained in the power housing 110. It is therefore beneficial to dissipate generated heat from the LED lighting apparatus 108.
Referring now primarily to FIGS. 4A-4C, but with continued reference to FIGS. 2-5, an illustrative embodiment for connecting the power housing 110 to the LED housing 112 is presented. The front face 122 of the power housing 110 includes a shoulder 166 for supporting a support member 168. In one embodiment, an outer portion of the support member 168 is supported by the power housing 110 via the shoulder 166. The support member 168 may be a plate, formed in a number of shapes to include round, square, or rectangular shapes. The support member 168 is connected to the extension member 148. In one embodiment the support member 168 is attached to the second end 152 of the extension member 148. The support member 168 may be connected to the extension member 148 using attachment members 172 such as countersunk screws. Once the support member 168 is connected to the extension member 148 a technician may rotate or swivel the LED housing 112 relative to the power housing 110 so as to position the LED housing 112 into the best position for illuminating the area 101a. A locking member 174 may clamp the support member 168 against the shoulder 166 to prevent further movement of the LED housing 112 relative to the power housing 110. The locking member 174 may be a plate that is positioned adjacent the support member 168. Attachment members 176 secure the locking member 174 to the support member 168. The attachment members 176, for example, may be bolts. Using the power housing 110 via the shoulder 166 to support the support member 168 provides added safety so that the LED housing 112 will not fall should a technician not adequately lock the support member 168 in place using the locking member 174.
Referring now primarily to FIG. 5 but with continued reference to FIGS. 2-4C, the heat generated by the LEDs 118 and the LED housing 112 rises toward the power housing 110 due to the orientation of the LED lighting apparatus 108, i.e., the driver housing 110 being generally positioned above the LED housing 112. In practice, an LED high mast luminaire must be designed to fit within the same form factor of a traditional HID high mast luminaire, i.e., sized to fit on existing lighting systems. This requires the driver housing 110 to be generally positioned above the LED lighting apparatus 108. The driver housing's 110 passive cooling fins 140 help prevent heated air that rises from the LED housing 112 from becoming trapped at the junction 133 or in the gap 132 between the driver housing 110 and the LED housing 112. It should be further noted that ambient temperature surrounding the LED housing 112, the power housing 110, and the gap 132 therebetween affect the overall temperature surrounding the LED housing 112, the power housing 110, the junction 133. Hot air from the LED housing 112 flows upward from the LED cooling fins 164. As the heated air rises, cooler air from the atmosphere or surrounding area fills the deficiency left by the heated air, thereby creating an airflow, i.e., the thermal pathway represented by the arrows 170. The thermal pathway 170 rolls along the driver housing cooling fins 140, acting to increase heat transfer away from the drivers 130 as the upward airflow pulls cooler, surrounding air along the driver housing cooling fins 140. It should be appreciated that mounting the drivers 130 at an angle increases the surface area that is exposed to the chimney of hot air from the LED housing 112 and therefore cooler air according to the thermal pathway 170.
The LED lighting apparatus 108 facilitates both air convection and conduction to cool the LED housing 112, the power housing 110, the components associated with the housings 110, 112, and the junction 133 between the housings 110, 112, to help ensure longer life, higher delivered lumens over time, and color consistency. The heat dissipation methods used by the LED lighting apparatus 108 are passive meaning no internal fans or alternative cooling devices are required to dissipate heat.
Referring to FIG. 6, another embodiment of a LED lighting apparatus 208 is presented. The LED lighting apparatus 208 is similar to the LED lighting apparatus 108 illustrated in FIGS. 4A-4C with one exception. The cooling fins 164 of the LED housing 112 extend along the longitudinal axis 129 of the LED housing 112 instead of the transverse axis 127 as illustrated in FIGS. 4A-4C.
In operation, the configuration of the LED lighting apparatus 108 functions to dissipate heat generated by the components associated with the two housings 110, 112 to increase the life of the LEDs 118 and preserve the quality of the LEDs' 118 light output. In one aspect, the LED panel 116 is positioned substantially horizontal to the area 101a to be illuminated to increase the efficiency of the light output relative to the light captured at the area 101a to be illuminated. This orientation further functions to decrease glare. In another aspect, the LED housing cooling fins 164 extending from the back face 162 of the LED housing 112 dissipates heat generated by the LED housing 112. In yet another aspect, the orientation of the power housing cooling fins 140 provides several benefits. First, as air is dissipated from the LED housing 112 upward toward the power housing 110 (due to the nature of hot air rising), the power housing cooling fins 140 prevent heated air from becoming trapped between the LED housing 112 and the power housing 110 by providing a low resistance pathway, as indicated by the arrows 170, for the hot air to follow; the pathway extending along the power housing cooling fins 140. Second, the power housing cooling fins 140 provide heat dissipation for the power housing 110 by acting as a heat sink for heated air trapped in the internal space or compartment 146. The power housing cooling fins 140 act as a passive heat sink allowing heat generated from the driver 130 to be conducted through the angled side face walls 136, 138 and into the power housing cooling fins 140. In certain aspects, the angled position of the power housing cooling fins 140 induces airflow along the cooling fins to both remove heat surrounding the power housing cooling fins 140 and to pull heated air away from the LED housing 112.
As described above, in the foregoing description of certain embodiments, specific terminology has been resorted to for the sake of clarity. However, the disclosure is not intended to be limited to the specific terms so selected, and it is to be understood that each specific term includes other technical equivalents which operate in a similar manner to accomplish a similar technical purpose. As stated above, terms such as “top”, “bottom”, “above”, “below”, “upward” and “downward” and the like are used as words of convenience to provide reference points and are not to be construed as limiting terms.
In this specification, any use of the word “comprising” is to be understood in its “open” sense, that is, in the sense of “including”, and thus not limited to its “closed” sense, that is the sense of “consisting only of”. A corresponding meaning is to be attributed to the corresponding words “comprise”, “comprised” and “comprises” where they appear.
In addition, the foregoing describes only some embodiments of the invention(s), and alterations, modifications, additions and/or changes can be made thereto without departing from the scope and spirit of the disclosed embodiments, the embodiments being illustrative and not restrictive.
Furthermore, invention(s) have been described in connection with what are presently considered to be the most practical and preferred embodiments, it is to be understood that the invention(s) are not to be limited to the disclosed embodiments, but on the contrary, are intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention(s). Also, the various embodiments described above may be implemented in conjunction with other embodiments, e.g., aspects of one embodiment may be combined with aspects of another embodiment to realize yet other embodiments. Further, each independent feature or component of any given assembly may constitute an additional embodiment.

## Claims

1. A lighting apparatus, comprising:
a power housing defined by a front face, a back face and a plurality of sidewalls;
a plurality of cooling fins extending from the power housing;
a plurality of drivers housed by the power housing and operable to power a plurality of light emitting diodes (LEDs); and
an LED housing rotatably coupled to and thermally separated from the power housing, the LED housing supporting the plurality of LEDs.

2. The lighting apparatus of claim 1 further comprising a plurality of LED cooling fins extending from and substantially covering the LED housing.

3. The lighting apparatus of claim 1 wherein a first set of cooling fins extend from a first sidewall of the power housing and a second set of cooling fins extend from a second sidewall of the power housing.

4. The lighting apparatus of claim 3 wherein at least one of the plurality of drivers is secured to the first sidewall and at least one of the plurality of drivers is secured to the second sidewall.

5. The lighting apparatus of claim 4 wherein the first sidewall is disposed opposite the second sidewall, each of the first and second sidewalls being angled with respect to the LED housing to create angled thermal pathways for air to flow to cool the first and second set of cooling fins.

6. The lighting apparatus of claim 1 further comprising an extension member coupling the LED housing to the power housing.

7. The lighting apparatus of claim 6 wherein the extension member defines an aperture through which a cord extends.

8. The lighting apparatus of claim 7 wherein the aperture is insulated.

9. The lighting apparatus of claim 1 wherein the power housing defines an aperture through which a high mast extension member is received.

10. The lighting apparatus of claim 1 wherein the LED housing is rotatable up to 360 degrees with respect to the power housing.

11. The lighting apparatus of claim 1 wherein the power housing is disposed a distance above the LED housing, the distance being in a range of 1-4 inches.

12. The lighting apparatus of claim 1 wherein the power housing includes a shoulder surface and further comprising a support member coupled to the LED housing and supported by the shoulder surface.

13. The lighting apparatus of claim 12 further comprising a locking member securing the support member to the shoulder surface.

14. The lighting apparatus of claim 1 further comprising a plurality of LED panels supported by the LED housing, each LED panel supporting at least one of the plurality of LEDs, each LED panel corresponding to one of the plurality of drivers.

15. A high mast lighting apparatus, comprising:
a power housing defining an opening configured to receive a high mast extension member therethrough;
a plurality of drivers contained within the power housing;
a light emitting diode (LED) housing rotatably coupled to and thermally separated from the power housing;
a plurality of LED cooling fins extending from the LED housing toward the power housing; and
a plurality of LEDs supported by the LED housing and powered by the plurality of drivers.

16. The high mast lighting apparatus of claim 15 wherein the power housing includes a pair of opposed sidewalls disposed angled with respect to the LED housing, a plurality of cooling fins extending from each one of the pair of opposed sidewalls.

17. The high mast lighting apparatus of claim 16 wherein at least one of the plurality of drivers is secured to a first one of the pair of the opposed sidewalls and at least one of the plurality of drivers is secured to a second one of the pair of opposed sidewalls.

18. The high mast lighting apparatus of claim 15 wherein the power housing includes a shoulder surface and further comprising:
a support member coupled to the LED housing and supported by the shoulder surface; and
a locking member securing the support member to the shoulder surface.

19. A high mast lighting system, comprising:
a plurality of lighting apparatuses each configured to be coupled to an extension member disposed atop a high mast, each lighting apparatus comprising:
a power housing;
a light emitting diode (LED) housing rotatably coupled to and thermally separated from the power housing, a plurality of LED cooling fins extending from the LED housing;
the power housing having a pair of opposed sidewalls disposed angled with respect to the LED housing, a plurality of driver cooling fins extending from each of the pair of opposed sidewalls;
a plurality of drivers contained within the power housing; and
a plurality of LED panels, each LED panel supported by the LED housing and comprising a plurality of LEDs supported by the LED housing and powered by the plurality of drivers.

20. The high mast lighting system of claim 19 wherein each LED panel corresponds to one of the plurality of drivers.