Patent Publication Number: US-11047560-B2

Title: Light emitting diode cooling systems and methods

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a Continuation of U.S. Non-Provisional patent application Ser. No. 16/731,619, entitled “LIGHT EMITTING DIODE COOLING SYSTEMS AND METHODS,” filed Dec. 31, 2019, and U.S. Provisional Patent Application Ser. No. 62/854,161, entitled “LIGHT EMITTING DIODE COOLING SYSTEMS AND METHODS”, filed May 29, 2019, which are hereby incorporated by reference. 
    
    
     BACKGROUND 
     The present disclosure relates generally to light cooling systems. 
     This section is intended to introduce the reader to various aspects of art that may be related to various aspects of the present techniques, which are described and/or claimed below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of the present disclosure. Accordingly, it should be understood that these statements are to be read in this light, and not as admissions of prior art. 
     Generally, LED lighting instruments provide lighting for a variety of applications. In some applications, high intensity lighting from LED lighting instruments may be desirable. For example, LED lighting instruments may provide high intensity lighting for motion picture and television sets and studios. To provide such high intensity lighting (e.g., lighting consuming 500 W-1500 W of total power), an arrangement of LEDs within the lighting instruments may be relatively dense and numerous. As the density of LEDs in a given space increase, an amount of heat produced by the LEDs and a temperature of the LEDs may generally increase. Typical Wall Plug Efficiency (“WPE”) of blue LEDs used to make white light is 50% such that only 50% of the energy will be converted into photons and the other 50% will be lost as heat. There may be an additional loss when the light is converted from blue light to white by the phosphors. As such, about half of the electrical power provided to LEDs is converted into heat. 
     Conventional cooling techniques for lighting systems may not sufficiently cool such high intensity LED lighting instruments. Additionally, Chip Scale Packaging (“CSP”) technology and Chip on Board (“COB”) arrays provide the ability to directly attach LED die to a printed circuit board (“PCB”) without a package. Typical LED die are only 1 mm in size (e.g., a length of the die) or less. The LED die are packaged separately, which makes them easier to handle in manufacturing and increases the available area for dissipating heat (e.g., 3 mm×3 mm is a common package for example). In COB and/or CSP technology, an array of LED dies is attached directly to a high-resolution PCB which can dramatically increase the power density. LED arrays with power densities of 80 watts per square inch and higher are produced today with these CSP and COB technologies with higher power densities constantly being developed. LEDs may typically require being maintained at a junction temperature of less than 125 degrees Celsius or they will be damaged. Due to the heat restrictions, the packing density of LEDs in system designs is effectively limited by heat. Traditional air cooling techniques, such as via heat sinks, may not sufficiently cool the LED lighting instruments. Even adding fans to increase airflow over metal heat sinks provides limited heat dissipation. Although the following description describes cooling systems used in LED lighting systems, the cooling systems may be deployed in other lighting systems. 
     BRIEF DESCRIPTION 
     The light cooling systems and methods disclosed herein provide cooling for an LED assembly. The light cooling systems include a fluid configured to flow over the LED assembly to cool LEDs emitting light and to remove heat produced by the LEDs. A pump of the cooling system may circulate the fluid from the LED assembly to a heat exchanger, configured to remove the heat from the fluid, and back to the LED assembly to continue cooling and removing heat from the LED assembly. Additionally, light cooling methods include controlling the pump to control the flowrate of the fluid through the heat exchanger and over/through the LED assembly. 
    
    
     
       DRAWINGS 
       These and other features, aspects, and advantages of the present disclosure will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings. The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee. 
         FIG. 1  is a schematic diagram of an embodiment of a cooling system configured to immersively and actively cool a light emitting diode (LED) assembly, in accordance with one or more current embodiments; 
         FIG. 2  is a perspective view of an embodiment of a lighting assembly having the LED assembly and the cooling system of  FIG. 1 , in accordance with one or more current embodiments; 
         FIG. 3  is a cross-sectional view of the lighting assembly of  FIG. 2  having the cooling system and the LED assembly, in accordance with one or more current embodiments; 
         FIG. 4  is a perspective cross-sectional view of the lighting assembly of  FIG. 2  having the cooling system and the LED assembly, in accordance with one or more current embodiments; 
         FIG. 5  is a perspective view of the LED assembly of  FIG. 2 , in accordance with one or more current embodiments; 
         FIG. 6A  is a rear perspective view of the lighting assembly of  FIG. 2  having the cooling system and the LED assembly, in accordance with one or more current embodiments; 
         FIG. 6B  is a rear perspective view of another embodiment of a lighting assembly having the cooling system of  FIG. 1 , in accordance with one or more current embodiments; 
         FIG. 7  is a perspective view of another embodiment of the cooling system and the LED assembly of  FIG. 1  including a transparent enclosure, in accordance with one or more current embodiments; 
         FIG. 8  is a perspective cross-sectional view of the LED assembly and the transparent enclosure of  FIG. 7 , in accordance with one or more current embodiments; 
         FIG. 9  is a bottom perspective view of the LED assembly and the transparent enclosure of  FIG. 7 , in accordance with one or more current embodiments; 
         FIG. 10  is a partially exploded view of the LED assembly and the transparent enclosure of  FIG. 7 , in accordance with one or more current embodiments; 
         FIG. 11  is a side view of the cooling system of  FIG. 7  and a side view of an embodiment of a lighting assembly, in accordance with one or more current embodiments; 
         FIG. 12  includes side views of the cooling system of  FIG. 7 , in accordance with one or more current embodiments; 
         FIG. 13  includes perspective views of the cooling system of  FIG. 7  coupled to light directing assemblies, in accordance with one or more current embodiments; 
         FIG. 14  is a perspective cross-sectional view of another embodiment of a lighting assembly having the LED assembly and the cooling system of  FIG. 1 , in accordance with one or more current embodiments; 
         FIG. 15  is a perspective view of the lighting assembly of  FIG. 14 , in accordance with one or more current embodiments; and 
         FIG. 16  is a flow diagram of an embodiment of a method for controlling the cooling system of  FIGS. 1-15 , in accordance with one or more current embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     One or more specific embodiments of the present disclosure will be described below. These described embodiments are only examples of the presently disclosed techniques. Additionally, in an effort to provide a concise description of these embodiments, all features of an actual implementation may not be described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers&#39; specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but may nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure. 
     When introducing elements of various embodiments of the present disclosure, the articles “a,” “an,” and “the” are intended to mean that there are one or more of the elements. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements. Additionally, it should be understood that references to “one embodiment” or “an embodiment” of the present disclosure are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. 
     Turning now to the drawings,  FIG. 1  is a schematic diagram of a cooling system  100  configured to actively cool an LED assembly  102 . The cooling system  100  includes an enclosure  104  configured to at least partially enclose and/or house the LED assembly  102  and a heat exchanger  106  fluidly coupled to the enclosure  104 . The cooling system  100  also includes a pump  108  configured to circulate fluid (e.g., coolant, mineral oil, water, a hydrocarbon fluid, a silicon fluid, or a combination thereof) along a cooling circuit  110  through the heat exchanger  106 , through the enclosure  104 , through and/or over the LED assembly  102 , and back to the pump  108 . In certain embodiments, the cooling system  100  may include the LED assembly  102  or a portion thereof. 
     The LED assembly  102  may be any assembly including one or more LEDs. For example, to provide lighting for applications such as television and theater sets, film sets, tradeshows, and any one of the range of permanent, semi-permanent, and temporary settings, the LED assembly  102  may include multiple LEDs configured to emit light. While emitting light, the LEDs may produce heat and a temperature of a surrounding area (e.g., an area adjacent to the LED assembly  102  and/or within/adjacent to the enclosure  104 ) may generally increase. 
     During operation, the cooling system  100  is configured to absorb the heat generated by the LED assembly  102  and to transfer the heat to ambient air. For example, as the pump  108  circulates the fluid through the enclosure  104  and/or through the LED assembly  102 , the fluid may absorb the heat generated by the LED assembly  102 . The heat exchanger  106  may include a radiator and/or fan(s) configured to actively draw ambient air toward/across the heat exchanger  106  to cool the fluid traveling through the heat exchanger  106  and along the cooling circuit  110 . In certain embodiments, the heat exchanger  106  may include a second fluid (e.g., in addition to or in place of the ambient air) configured to exchange heat with the fluid flowing along the cooling circuit  110 . 
     The pump  108  may be a variable speed pump configured to circulate the fluid through the cooling circuit  110 . In certain embodiments, a housing of the pump  108  may include a flexible diaphragm configured to expand and/or retract based on a volume of the fluid flowing along the cooling circuit  110 . For example, as the fluid absorbs heat at and from the LED assembly  102 , the fluid may expand (e.g., thermal expansion). As the fluid flows from the LED assembly  102  and the enclosure  104 , the flexible diaphragm of the pump  108  may expand to allow of the increased volume of fluid to pass through the pump without affecting the flowrate of the fluid through the pump  108  and along the cooling circuit  110 . In some embodiments, the flexible diaphragm of the pump  108  may be a service panel configured to allow access to internal portions of the pump  108 . As described in greater detail below, in certain embodiments, the flexible diaphragm may be located elsewhere along the cooling circuit  110  (e.g., in addition to or in place of be located at the pump  108 ) to facilitate thermal expansion of the fluid in the cooling circuit  110 . 
     The LED assembly  102  is configured to emit light, which may pass through the fluid circulating between the LED assembly  102  and the enclosure  104  and through the enclosure  104 . As such, the LED assembly  102  is configured to provide lighting for the various applications described herein (e.g., motion picture and television lighting and other applications that may benefit from high intensity lighting) while being cooled by the cooling system  100 . The LEDs of the LED assembly  102  may include varied/multiple configurations. For example, the LED assembly  102  may include chip scale packaging (CSP) arrays (e.g., bi-color CSP arrays). CSP technology may benefit from very high density of LED chips in a specified area (e.g., per square inch/centimeter), and CSP technology may utilize different colors of individual LEDs. For example, CSP technology may include a five color configuration (e.g., warm white, cool white, red, green, and blue), a four color configuration (e.g., white, red, green, and blue), a three color configuration (e.g., red, green, and blue), a bi-color white configuration (e.g., warm white and cool white), a single white configuration, and/or a single color configuration. 
     In some embodiments, the LED assembly  102  may include single color chip on board (“COB”) arrays. The COB arrays may include a relatively large number of LEDs bonded to a single substrate and a layer of phosphor placed over the entire array. An advantage of COB technology is very high LED density per specified area (e.g., per square inch/centimeter). Additionally or alternatively, the LED assembly  102  may include discrete LEDs. 
     The cooling system  100  includes a controller  120  configured to control the LED assembly  102 , the heat exchanger  106 , the pump  108 , or a combination thereof. For example, the controller  120  may control some or all LEDs of the LED assembly  102  to cause the LEDs to emit light. Additionally or alternatively, the controller  120  may control operation of the heat exchanger  106  to cause the heat exchanger  106  to exchange more or less heat between the fluid and the ambient air. For example, the controller  120  may control fans of the heat exchanger  106  to control an air flow rate through/over the heat exchanger  106 . In certain embodiments, the fans of the heat exchanger  106  may be controlled via pulse width modulated (PWM) power. The fans may be controlled based on the temperature at the LED assembly  102 . In some embodiments, to reduce a noise output of the fans of the heat exchanger  106 , the controller  120  may operate the fans only when cooling of the fluid by other means (e.g., via the radiator without active airflow) is insufficient. 
     As illustrated, the cooling system  100  may include a sensor  121  disposed at the LED assembly  102  and configured to output a signal (e.g., an input signal) indicative of the temperature at the LED assembly  102  and/or a temperature of the fluid adjacent to the LED assembly  102 . The sensor  121  may be any suitable temperature/thermal sensor, such as a thermocouple. In certain embodiments, the cooling system  100  may include other thermal sensor(s) disposed within the fluid and configured to output a signal indicative of a temperature of the fluid (e.g., within the enclosure  104 ) and/or disposed at the enclosure  104  and configured to output a signal indicative of a temperature at the enclosure  104 . 
     Further, the controller  120  may control operation of the pump  108  to cause the pump  108  to circulate the fluid along the cooling circuit  110  at particular flowrates. For example, based on the temperature at the LED assembly  102  and/or at the enclosure  104  (e.g., based on the signal indicative of the temperature at the LED assembly  102  received from the sensor  121 ), the controller  120  may be configured to output a signal (e.g., an output signal) to the pump  108  indicative of instructions to adjust the flowrate of the fluid flowing through the cooling circuit  110 . 
     As illustrated, the controller  120  includes a processor  122  and a memory  124 . The processor  122  (e.g., a microprocessor) may be used to execute software, such as software stored in the memory  124  for controlling the cooling system  100  (e.g., for controller operation of the pump  108  to control the flowrate of fluid through the cooling circuit  110 ). Moreover, the processor  122  may include multiple microprocessors, one or more “general-purpose” microprocessors, one or more special-purpose microprocessors, and/or one or more application specific integrated circuits (ASICS), or some combination thereof. For example, the processor  122  may include one or more reduced instruction set (RISC) or complex instruction set (CISC) processors. 
     The memory device  124  may include a volatile memory, such as random-access memory (RAM), and/or a nonvolatile memory, such as read-only memory (ROM). The memory device  124  may store a variety of information and may be used for various purposes. For example, the memory device  124  may store processor-executable instructions (e.g., firmware or software) for the processor  122  to execute, such as instructions for controlling the cooling system  100 . In certain embodiments, the controller  120  may also include one or more storage devices and/or other suitable components. The storage device(s) (e.g., nonvolatile storage) may include ROM, flash memory, a hard drive, or any other suitable optical, magnetic, or solid-state storage medium, or a combination thereof. The storage device(s) may store data (e.g., measured temperatures at the LED assembly  102 ), instructions (e.g., software or firmware for controlling the cooling system  100 ), and any other suitable data. The processor  122  and/or the memory device  124 , and/or an additional processor and/or memory device, may be located in any suitable portion of the system. For example, a memory device for storing instructions (e.g., software or firmware for controlling portions of the cooling system  100 ) may be located in or associated with the cooling system  100 . 
     Additionally, the controller  120  includes a user interface  126  configured to inform an operator of the temperature at the LED assembly  102  and/or of the flowrate of the fluid through the cooling circuit  110 . For example, the user interface  126  may include a display and/or other user interaction devices (e.g., buttons) configured to enable operator interactions. 
       FIG. 2  is a perspective view of an embodiment of a lighting assembly  130  having the cooling system  100  and the LED assembly  102  of  FIG. 1 . The lighting assembly  130  includes a reflector  132  (e.g., a parabolic reflector) configured to reflect light emitted by the LED assembly  102 . For example, the light emitted by the LED assembly  102  may pass through the fluid disposed between the LED assembly  102  and the enclosure  104 , through the enclosure  104 , and may be reflected by the reflector  132  outwardly. The reflector  132  is coupled to a chassis  134  (e.g., a housing) of the lighting assembly  130 . In certain embodiments, the LED assembly  102 , the enclosure  104 , and/or other portions of the cooling system  100  may be coupled to the chassis  134 . For example, as described in greater detail below, the heat exchanger  106  and/or the pump  108  of the cooling system  100  may be coupled to the chassis  134 . 
       FIG. 3  is a cross-sectional view of the lighting assembly  130  of  FIG. 2  having the cooling system  100 . As illustrated, the cooling system  100  includes the enclosure  104 , the LED assembly  102  disposed in the enclosure  104 , the heat exchanger  106  configured to exchange heat with the fluid, and the pump  108  configured to drive circulation of the fluid. Additionally, the cooling system  100  includes an inlet pipe  140  coupled to the pump  108  and to a fluid inlet  142  of the enclosure  104 . Further, the cooling system  100  includes an outlet pipe  144  coupled to a fluid outlet  146  of the enclosure  104  and to the heat exchanger  106 . In certain embodiments, the inlet pipe  140  and/or the outlet pipe  144  may extend into the LED assembly  102  and/or into the enclosure  104 . 
     As illustrated, the fluid inlet  142  is disposed generally along a centerline of the enclosure  104  and the LED assembly  102 . The pump  108  is configured to drive the fluid from the inlet pipe  140 , into the fluid inlet  142 , generally along the centerline of the LED assembly  102  and the enclosure  104 , into and along a gap between the LED assembly  102  and the enclosure (e.g., a gap where the fluid absorbs heat generated by the LED assembly  102 ), out of the fluid outlet  146 , and into the outlet pipe  144  (e.g., along the cooling circuit  110 ). After absorbing heat at the LED assembly  102 , the fluid circulates through the heat exchanger  106  and returns to the pump  108 . At the heat exchanger  106 , the fluid rejects the heat absorbed at the LED assembly  102 . For example, the heat exchanger  106  includes a radiator  150  and fans  152  configured to draw air (e.g., ambient air) across the radiator  150 . The air drawn across the radiator  150  may absorb heat from the fluid flowing through the radiator  150  (e.g., heat transferred from the fluid to the radiator  150 ), thereby cooling the fluid for subsequent circulation along the cooling circuit  110  and back through the LED assembly  102  and the enclosure  104 . 
     Additionally, in certain embodiments, the heat exchanger  106  may not reject all the heat absorbed by the fluid at the LED assembly  102 , such that the fluid retains at least some of the heat absorbed at the LED assembly  102 . As such, a temperature of the fluid along the cooling circuit  110  (e.g., an average temperature) may increase, thereby increasing a volume of the fluid. The cooling system  100  includes a flexible membrane  154  at the pump  108  configured to expand due to heating of the fluid and to retract due to cooling of the fluid (e.g., to accommodate volumetric changes of the fluid along the cooling circuit  110 ). In certain embodiments, the flexible membrane  154  may be included elsewhere within the cooling system  100 . 
     The cooling system  100  includes a valve  156  fluidly coupled to the cooling circuit  110 . The valve  156  may be configured to bleed air and/or fluid from the cooling circuit  110 , such as when fluid is added to the cooling circuit  110  (e.g., the valve  156  may be a bleed valve). Additionally or alternatively, fluid may be added to the cooling circuit  110  via the valve  156  (e.g., the valve  156  may be a fill valve). In certain embodiments, the cooling system  100  may include multiple valves  156  with a first valve  156  being a bleed valve and a second valve  156  being a fill valve. 
     As described above, the controller  120  may be configured to control the LED assembly  102 , the heat exchanger  106 , the pump  108 , or a combination thereof. For example, the controller  120  may control some or all LEDs of the LED assembly  102  to cause the LEDs to emit light. Additionally, the controller  120  may control a rotation rate of the fans  152  and/or a flow rate of the fluid along the cooling circuit  110 . For example, based on feedback received from the sensor  121  at the LED assembly  102  (e.g., the temperature at the LED assembly  102 , the controller  120  may control the rotation rate of the fans  152  and/or the flow rate of the fluid. More specifically, in response the temperature at the LED assembly  102  being greater than a target temperature and a difference between the temperature at the LED assembly  102  and the target temperature exceeding a threshold value, the controller may increase the rotation rate of the fans  152  and/or may increase the flow rate of the fluid. In response the temperature at the LED assembly  102  being less than the target temperature and the difference between the temperature at the LED assembly  102  and the target temperature exceeding a threshold value, the controller may decrease the rotation rate of the fans  152  and/or may decrease the flow rate of the fluid. 
       FIG. 4  is a perspective cross-sectional view of the lighting assembly  130  of  FIG. 2  having the cooling system  100 . As illustrated, the fluid of the cooling system  100  is configured to flow from the inlet pipe  140 , through the fluid inlet  142 , and through an inner annular passage  160  formed within the LED assembly  102  (e.g., in a direction  162 ). As such, the fluid enters the LED assembly  102  as a chilled fluid. The inner annular passage  160  is coupled to the fluid inlet  142  and to an end  164  of the LED assembly  102 . From the inner annular passage  160 , the fluid circulates through an end passage  166  formed between the end  164  of the LED assembly  102  and an end  168  of the enclosure  104 , as indicated by arrows  170 . From the end passage  166 , the fluid circulates into an outer annular passage  172  formed between the LED assembly  102  and the enclosure  104 , as indicated by arrow  174 . As the fluid flows through the outer annular passage  172 , the fluid absorbs heat generated by the LED assembly  102 . From the outer annular passage  172 , the fluid exits the enclosure  104  through the fluid outlet  146  and flows into the outlet pipe  144 . As such, the fluid exits the enclosure  104  as a heated fluid. After passing through the heat exchanger  106  and the pump  108  of the cooling system  100 , the fluid circulates back to through the LED assembly  102  and the enclosure  104  to continue cooling the LED assembly  102 . 
     The lighting assembly  130  is a side emission configuration of the lighting assembly, such that the lighting assembly  130  is configured to emit light radially outwardly (e.g., from sides of the lighting assembly  130 ) and through the fluid and the enclosure  104 . As described in greater detail below in reference to  FIGS. 14 and 15 , the cooling system  100  may include a front emission configuration of the lighting assembly, such as in place of or in addition to the side emission configuration of  FIGS. 2-5 . 
       FIG. 5  is a perspective view of the LED assembly  102  of  FIG. 2 . As illustrated, the LED assembly  102  includes a tower  180  and LED arrays  182  mounted to the tower  180 . As illustrated, the tower  180  is a hexagonal structure formed by panels  184  (e.g., six panels  184 ) with nine LED arrays  182  mounted on each panel  184 . In certain embodiments, the tower may include more or fewer panels  184  (e.g., three panels  184 , four panels  184 , eight panels  184 , etc.) and/or each panel  184  may include more or fewer LED arrays  182  (e.g., one LED array  182 , two LED arrays  182 , five LED arrays  182 , twenty LED arrays  182 , etc.). In some embodiments, the tower  180  may be shaped differently in other embodiments and/or may be omitted. For example, the LED arrays  182  may be mounted directly to the enclosure  104  in some embodiments. In certain embodiments, the LED assembly  102  may include other LED configurations in addition to or in place of the LED arrays  182 . 
     The LED arrays  182  of the LED assembly  102  are configured to emit light outwardly through the fluid flowing between the LED assembly  102  and the enclosure  104  (e.g., through the outer annular passage  172  formed between the LED assembly  102  and the enclosure  104 ) and through the enclosure  104 . The fluid may be transparent or semi-transparent such that the fluid is configured to allow the light to pass through the fluid toward the enclosure  104 . For example, the fluid may be a dielectric and/or electrically insulating fluid having a refractive index of between 1.4 and 1.6. In some embodiments, the enclosure  104  enclosing the fluid may be acrylic, polycarbonate, glass (e.g., borosilicate glass), or another material having a refractive index between about 1.44-1.5. In certain embodiments, the LEDs of the LED arrays  182  may include silicone (e.g., a silicone layer) through which light emitted by the LEDs passes. The silicone may have a refractive index of about 1.38-1.6. As such, a type of fluid (e.g., the fluids having the refractive indices recited above) may facilitate light passage from the LEDs, through the fluid, and toward the enclosure  104 . Additionally, the refractive index of the layer of the LED (e.g., the silicone), the fluid, and/or the enclosure  104  may generally be matched (e.g., within a difference threshold). In some embodiments, the fluid and/or the enclosure  104  may behave as lens configured to optically shape light provided by the LED assembly  102 . For example, the fluid and/or the enclosure  104  having the specific refractive indices described above may allow the fluid and/or the enclosure to shape the light in a desirable manner. 
     Additionally or alternatively, the fluid may include a mineral oil having a relatively long shelf life (e.g., about twenty-five years) or a fluid having properties similar to mineral oil. The fluids may be non-corrosive such that the fluids facilitate pumping along the cooling circuit  110  by the pump  108  and compatible with plastics and other system materials. Further, such fluids may generally have a relatively low viscosity, which may allow directly cooling the electronics of the LED assembly  102  (e.g., the LED arrays  182 , wiring coupled to the LED arrays  182  and to printed circuit boards (“PCB&#39;s”), and other electronic components of the LED assembly  102 ) without affecting the performance/functionality of the electronics. In certain embodiments, the type of the fluid included in the cooling circuit  110  may depend on an amount of LED arrays  182  and/or an amount of LEDs generally included in the LED assembly  102 , a structure/geometry of the LED assembly  102 , a density of LEDs of the LED assembly  102 , an amount of heat generated by the LED assembly  102 , or a combination thereof. During operation, the LED arrays  182  of the LED assembly  102  may have a power density of between 20 W-300 W per square inch, between 50 W-250 W per square inch, and other suitable power densities. In an aspect, each LED array  182  may have a surface area of 4 square inches or less. Due to the cooling systems mentioned herein, the LED arrays  182  may be operated at the aforementioned power densities for longer than 30 seconds, 1 minute, 1 hour, and 100 hours. In some embodiments, the LED assembly  102  may have a total power of 400 W-5000 W. 
     In some embodiments, the refractive index of the fluid disposed between the LED arrays  182  and the enclosure  104  may cause light to more easily leave the LED arrays  182  compared to an embodiment in which the LED arrays  182  are exposed to air. This may result in a color shift of the light emitted from the LED arrays  182 . The controller  120  may control the LED arrays  182  (e.g., the colors and/or color temperatures of the LED arrays  182 ) based on the potential color shift of the emitted light. 
     The enclosure  104  may include clear, transparent, and/or semi-transparent materials such that the light emitted by the LED assembly  102  may pass through the enclosure  104  (e.g., after passing through the fluid disposed within and/or flowing through the outer annular passage  172 ) and outwardly from the enclosure  104 . For example, the enclosure  104  may be formed of a clear plastic and/or glass (e.g., borosilicate glass). In certain embodiments, the enclosure  104  may include poly(methyl methacrylate) (“PMMA”) and/or other acrylics. 
     As illustrated, the LED assembly  102  includes printed circuit boards (“PCBs”)  190  coupled to a base PCB  192 , the LED arrays  182 , and the end  164  (e.g., end plate) of the LED assembly  102 . For example, each PCB  190  extends generally along a respective panel  184  and is coupled (e.g., physically and electrically coupled via connectors  193 ) to the LED arrays  182  coupled to the respective panel  184 . Each connector  193  is coupled to a respective LED array  182  at connections  194 . In certain embodiments, each LED array  182  may be configured to snap/click into place on the panel  184 . For example, each panel  184  may include features configured to receive the LED arrays  182  via a snap or click mechanism to facilitate assembly of the LED assembly  102 . 
       FIG. 6A  is a rear perspective view of the lighting assembly  130  of  FIG. 2  having the cooling system  100 . As generally described above, the cooling system  100  includes the inlet pipe  140  configured to flow fluid (e.g., chilled fluid) into the LED assembly  102  and the enclosure  104  and the outlet pipe  144  configured to receive fluid (e.g., heated fluid) from the LED assembly  102  and the enclosure  104 . The fluid circulates from the outlet pipe  144 , through the radiator  150  of the heat exchanger  106 , through the pump  108 , and back to the inlet pipe  140 . As illustrated, the cooling system includes four fans  152  configured to draw air across the radiator  150  to cool the fluid passing through the radiator  150 . In certain embodiments, the cooling system may include more or fewer fans  152  (e.g., one fan  152 , two fans  152 , three fans  152 , five fans  152 , ten fans  152 , etc.). The fans  152  are positioned above the radiator  150 , such that the heat transferred from the fluid passing through the radiator  150  moves generally upwardly toward/through the fans  152 . Additionally, the heat exchanger  106  and the pump  108  are mounted to the chassis  134  of the lighting assembly  130 . 
       FIG. 6B  is a rear perspective view of an embodiment of a lighting assembly  187  having the cooling system  100  of  FIG. 1 . The lighting assembly  187  includes the inlet pipe  140  configured to flow fluid (e.g., chilled fluid) into the LED assembly  102  and the enclosure  104  and the outlet pipe  144  configured to receive fluid (e.g., heated fluid) from the LED assembly  102  and the enclosure  104 . The fluid circulates from the outlet pipe  144  to the radiator  150 , through the radiator  150 , to an intermediate pipe  189 , through an expansion chamber  188  coupled to the intermediate pipe  189 , and back to the inlet pipe  140  via the pump  108 . The expansion chamber  188  is configured to expand due to heating of the fluid and to retract due to cooling of the fluid (e.g., to accommodate volumetric changes of the fluid along the cooling circuit  110 ). In certain embodiments, the expansion chamber  188  may be included elsewhere along the cooling circuit  110 , such as along the inlet pipe  140  and/or along the outlet pipe  144 . 
     As illustrated, the lighting assembly  187  includes a first bracket  191  coupled to the radiator  150  and the expansion chamber  188  and a second bracket  195  coupled to the radiator  150  and the pump  108 . The radiator  150  and the expansion chamber  188  are mounted to the first bracket  191 , and the first bracket  191  is mounted to the chassis  134 , such that the first bracket  191  is configured to support a weight of the expansion chamber  188  and/or at least a portion of a weight of the radiator  150  (e.g., to transfer forces associated with the weight(s) to the chassis  134 ). Additionally, the radiator  150  and the pump  108  are mounted to the second bracket  195 , and the second bracket  195  is mounted to the chassis  134 , such that the second bracket  195  is configured to support a weight of the pump  108  and/or at least a portion of the weight of the radiator  150  (e.g., to transfer forces associated with the weight(s) to the chassis  134 ). 
       FIG. 7  is a perspective view of an LED assembly  196  and an enclosure  198  that may be included the cooling system  100  of  FIG. 1 . As illustrated, the LED assembly  196  is disposed within the enclosure  198 . The LED assembly  196  includes a fluid inlet  200  configured to receive the fluid flowing along the cooling circuit  110  (e.g., as indicated by arrow  202 ) and a fluid outlet  204  configured to flow the fluid from the enclosure and the LED assembly  196  to the cooling circuit  110  (e.g., as indicated by arrow  206 ) (although the fluid direction may be reversed such that the fluid enters through the fluid outlet  204 , for example, and exits through the fluid inlet  200 ). Additionally, the enclosure  198  includes a base  208  and a cylinder  210  extending from the base  208 . In certain embodiments, the LED assembly  196  and/or the enclosure  198  of the cooling system  100  may be included in the lighting assembly of  FIGS. 2-6 . 
     The LED assembly  196  includes a tower  220  and the LED arrays  182  mounted to the tower  220 . As illustrated, the tower  220  is a hexagonal structure with nine LED arrays  182  mounted on each of the six sides of the hexagonal structure. In certain embodiments, the tower  220  may include more or fewer sides (e.g., three sides, four sides, eight sides, etc.) and/or each side may include more or fewer LED arrays  182  (e.g., one LED array  182 , two LED arrays  182 , five LED arrays  182 , twenty LED arrays  182 , etc.). In some embodiments, the tower  220  may be shaped differently in other embodiments and/or may be omitted. For example, the LED arrays  182  may be mounted directly to the enclosure  198  in some embodiments. In certain embodiments, the LED assembly  196  may include other LED configurations in addition to or in place of the LED arrays  182 . 
     The LED arrays  182  of the LED assembly  196  are configured to emit light outwardly through the fluid flowing between the LED assembly  196  and the enclosure  198  (e.g., through an outer annular passage  224  of the cooling system  100 ) and through the enclosure  198 . In some embodiments, the enclosure  198  enclosing the fluid may be acrylic, polycarbonate, glass (e.g., borosilicate glass), or another material having a refractive index between about 1.44-1.5. Additionally, the refractive index of the layer of the LED (e.g., the silicone), the fluid, and/or the enclosure  198  may generally be matched (e.g., within a difference threshold). 
     The enclosure  198  may include clear, transparent, and/or semi-transparent materials such that the light emitted by the LED assembly  196  may pass through the enclosure  198  (e.g., after passing through the fluid disposed within and/or flowing through the outer annular passage  224 ) and outwardly from the enclosure  198 . For example, the enclosure  198  may be formed of a clear plastic and/or glass (e.g., borosilicate glass). In certain embodiments, the enclosure  198  may include poly(methyl methacrylate) (“PMMA”) and/or other acrylics. 
     The cooling system  100  is configured to flow the fluid into the fluid inlet  200 , through the outer annular passage  224  between the LED assembly  196  and the enclosure  198 , and toward an end  230  of the tower  220 . The end  230  is disposed generally opposite of the base  208 . The tower  220  includes an inner annular passage  232  extending from the end  230  to the base  208 . As illustrated, the inner annular passage  232  is fluidly coupled to the outer annular passage  224  at the end  230  of the tower  220 . The cooling system  100  is configured to flow the fluid from the outer annular passage  224  and into the inner annular passage  232  via the end  230 . The inner annular passage  232  is fluidly coupled to the fluid outlet  204  such that the fluid may pass through the tower  220 , via the inner annular passage  232 , and out of the tower  220  and the enclosure  198  at the fluid outlet  204 . 
     As the fluid passes over and through the LED assembly  196  (e.g., over the LED arrays  182  and through the tower  220 ), the fluid is configured to absorb heat generated by operation of the LED arrays  182 . For example, because the fluid is configured to absorb heat generated by the LED arrays  182  while flowing through both the outer annular passage  224  and the inner annular passage  232 , the cooling system  100  is configured to significantly increase an amount of heat that may be absorbed compared to embodiments of cooling systems that extract heat only from an interior or exterior of a light source. Additionally, because the fluid is generally transparent and/or semi-transparent (e.g., the fluid has a refractive index generally between 1.4-1.5), the fluid may have minimal/no effects on the light emitted from the LED assembly  196  and through the fluid. As such, the fluid may actively cool the LED assembly  196  during operation of the LED assembly  196  with little to no effect on a quality of light emitted from the LED assembly  196 . 
     The LED assembly  196  is a side emission configuration of a lighting assembly, such that the LED assembly  196  is configured to emit light radially outwardly (e.g., from sides of the LED assembly  196 ) and through the fluid and the enclosure  198 . As described in greater detail below in reference to  FIGS. 14 and 15 , the cooling system  100  may also include a front emission configuration of the lighting assembly, such as in place of or in addition to the side emission configuration of  FIGS. 7-10 . 
       FIG. 8  is a perspective cross-sectional view of the LED assembly  196  and the enclosure  198  of  FIG. 7 . As described above, the enclosure  198  is configured to receive the fluid from the pump  108  through the fluid inlet  200 . The fluid is then configured to contact the tower  220  and a base  300  of the LED assembly  196  coupled to the tower  220 . The tower  220  and the base  300  are configured to direct the fluid upwardly along the outer annular passage  224 . The fluid is then configured to flow through the end  230  and into the inner annular passage  232 . As illustrated, the inner annular passage  232  is formed between and by the tower  220  and PCBs  302  of the LED assembly  196 . The fluid is configured to flow downwardly within the inner annular passage  232  toward a base PCB  304  electrically coupled to the PCBs  302 . After passing over the PCBs  302  and/or the base PCB  304 , the fluid is configured to exit the tower  220  and the enclosure  198  at the fluid outlet  204 . As mentioned with respect to  FIG. 7 , the fluid direction may be reversed such that the fluid may be configured to flow in through the fluid outlet  204 , up through the inner annular passage  232 , through the end  230 , and down the outer annular passage  224 , and out the fluid inlet  200 . 
     The PCBs  302  may be electrically coupled to the LED arrays  182  such that the PCBs  302  may provide power and/or communication with the LED arrays  182 . For example, the LED assembly  196  may include wiring extending outwardly between the PCBs  302  and the LED arrays  182 . As such, the fluid may flow over the PCBs  302  and the wiring extending between the PCBs  302  and the LED arrays  182  to cool and absorb heat from the tower  220  (e.g., heat generated by the LED arrays  182  that is transferred to/absorbed by the tower  220 ), from the PCBs  302 , and/or from the wiring. Additionally, the fluid may flow over the base PCB  304  and may absorb heat from the base PCB  304 . For example, the base PCB  304  includes a wet side  306  configured to contact the fluid and a dry side generally opposite the wet side  306  that is configured to remain dry (e.g., to not contact the fluid). As generally described above, the fluid may be dielectric and/or electrically insulating such that the fluid may have minimal/no electrical effects on the LED arrays  182 , the PCBs  302 , the base PCB  304 , and the wiring of the LED assembly  196 . 
       FIG. 9  is a bottom perspective view of the LED assembly  196  and the enclosure  198  of  FIG. 7 . As illustrated, the base PCB  304  includes a dry side  400  configured to remain generally dry (e.g., to not contact the fluid during operation of the cooling system  100 ). The LED assembly  196  includes a gasket  402  configured to form a seal between the enclosure  198  and the LED assembly  196  (e.g., between the base  208  of the enclosure  198  and the base PCB  304  of the LED assembly  196 ). As such, the LED assembly  196  may be remain dry at the dry side  400  of the base PCB  304 , and the cooling system  100  may be configured to flow the fluid through the enclosure  198  and the tower  220  without leaking fluid. 
       FIG. 10  is a partially exploded view of the LED assembly  196  and the enclosure  198  of  FIG. 7 . The LED assembly  196  is configured to insert into and to be removed from the enclosure  198  as generally indicated by arrow  500 . For example, to replace portions of the LED assembly  196  (e.g., the LED arrays  182 , the PCBs  302 , the base PCB  304 , wiring, etc.), the LED assembly  196  and the enclosure  198  may be disassembled by removing the LED assembly  196  from the enclosure  198  along an axis generally parallel to arrow  500 . Additionally, while the LED assembly  196  and the enclosure  198  are disposed in the illustrated positions (e.g., with the LED assembly  196  and the enclosure  198  extending downwardly), the LED assembly  196  may be removed from the enclosure  198  with a minimal loss and/or splashing of the fluid using threaded enclosures, a gasket, a latch, and/or other securing mechanisms. To assemble/reassemble the LED assembly  196  into the enclosure  198 , the LED assembly  196  may be inserted into the enclosure  198  along the axis generally parallel to the arrow  500 . Thus, the configuration and coupling of the LED assembly  196  and the enclosure  198  described herein may facilitate quick and easy maintenance of the LED assembly  196 . 
       FIG. 11  is a side view of the cooling system  100  of  FIG. 7  and a side view of a lighting assembly  600 . As illustrated, the base  208  of the enclosure  198  is coupled to a heat exchanger  601 . After absorbing heat from and at the LED assembly  196 , the fluid is configured to flow into and through the heat exchanger  601 . The heat exchanger  601  includes a radiator  602  configured to exchange heat from the fluid to ambient air adjacent to the heat exchanger  601 . The heat exchanger  601  may include the radiator  602  on each of four sides of the heat exchanger  601  (e.g., four radiators  602 ). In certain embodiments, the heat exchanger  601  may include more of fewer sides with each side having the radiator  602 . The radiator  602  includes fins  604  configured to transfer heat from the fluid (e.g., to absorb heat from the fluid) to the ambient air. In some embodiments, the heat exchanger  601  may include other shapes configured to cool the fluid (e.g., a sphere, a cylinder, etc.). 
     The LED arrays  182  of the LED assembly  196  extend outwardly from the base  208  of the enclosure  198  a distance  610 . In certain embodiments, the distance  610  may be between about three inches and about nine inches. In some embodiments, the distance  610  may be about five and one-half inches. Additionally, the cooling system  100  extends a generally vertical distance  612  and a generally horizontal distance  614 . In certain embodiments, the generally vertical distance  612  may between about ten inches and about twenty inches, and/or the generally horizontal distance  614  may be between about seven inches and about seventeen inches. In some embodiments, the generally vertical distance  612  may be fourteen inches, and/or the generally horizontal distance  614  may be twelve inches. 
     The lighting assembly  600  is a prior art lighting assembly having a lighting area  620  configured to emit light. A back portion of the lighting area  620  may be a heat sink configured to absorb/transfer heat from the lighting area  620 . As illustrated, the cooling system  100  is generally smaller and more compact than the lighting area  620  and the heat sink of the lighting assembly  600 . Additionally, as generally described above, the cooling system  100  is configured to provide sufficient cooling for the LED assembly  196  as the LED assembly  196  operates at 1500 W. The lighting assembly  600  may be configured to provide cooling for lights of the lighting area  620  operating at 400 W. As such, the cooling system  100  may be more versatile than the lighting assembly  600 , and prior art lighting assemblies generally, by providing a more compact design configured to operate at significantly higher powers. In certain embodiments, the LED assembly  102  and/or the enclosure  104  of the cooling system  100  may be coupled to the heat exchanger  601 , such that the heat exchanger  601  is configured to exchange heat with the fluid circulating through the LED assembly  102  and the enclosure  104 . 
       FIG. 12  includes side views of the cooling system  100  of  FIG. 7 . The cooling system  100  includes a cover  700  configured to fit over/onto the enclosure  198 . The cover  700  includes materials configured to convert a color correlated temperature (“CCT”) of light emitted by the LED assembly  196 . For example, the cover  700  may include and/or be formed of phosphor and may be configured to convert a cool white CCT of about 5600K to a warmer white CCT of about 4300K, about 3200K, and other CCT&#39;s. In certain embodiments, the cover  700  may be injection molded plastic, silicone, coated glass, or a combination thereof. In certain embodiments, the cover  700  may fit over/onto the enclosure  104 , such that the cover  700  converts a CCT of light emitted by the LED assembly  102  through the enclosure  104 . 
     The cover  700  is configured to slide onto and off of the enclosure  198 , as generally noted by arrow  702 . For example, the cover  700  may be easily field changeable such that an operator may slide the cover  700  onto and off of the enclosure  198 . Additionally, light produced by a low cost single color version of the LED assembly  196  may easily be converted to any CCT with the addition of the cover  700 , which may be of relatively low cost. Further, the cover  700  may be significantly more power efficient compared to traditional embodiments, because the cover  700  is not a filter removing a portion of light emitted by the LED assembly  196 . Instead, the cover  700  is configured to convert light to a desired color and CCT. 
     In certain embodiments, the LED assembly  196  may be configured to emit a blue light, cool white light (e.g., 5000K or higher), or other colors. The cover  700  may adapted for any suitable color and/or white such that light emitted from a single-color version of the LED assembly  196  (e.g., a blue light LED assembly  196  or a cool white light LED assembly  196 ) may be converted into any CCT and/or any color with no change to the LED assembly  196  or other electronics of the cooling system  100 . 
     As illustrated, the cover  700  is configured to contact the enclosure  198  while the cover  700  is disposed on the enclosure  198 . The contact between enclosure  198  and the cover  700  may allow the enclosure  198  to transfer heat to the cover  700 . The fluid flowing within the enclosure  198  may be configured to cool both enclosure  198  and the cover  700  (e.g., the fluid may absorb heat from the enclosure  198  to facilitate cooling of the cover  700 ). 
       FIG. 13  includes perspective views of the cooling system  100  of  FIG. 7  coupled to light directing assemblies  800 ,  802 , and  804  configured to direct light emitted by the LED assembly  102  of the cooling system  100 . For example, the light directing assembly  800  is a high bay assembly configured to be disposed in building setting and to direct light emitted by the LED assembly  102  downwardly. The light directly assembly  802  is a space light directing assembly configured to be disposed in a studio to provide environment lighting. Additionally, the light directly assembly  804  is an umbrella assembly configured to be disposed in a studio and to generally focus light emitted by the LED assembly  102 . 
       FIG. 14  is a perspective cross-sectional view of another embodiment of a lighting assembly  820  having an LED assembly  822  and the cooling system  100  of  FIG. 1 . The lighting assembly  820  is a front emission configuration of a lighting assembly that may be included in the cooling system  100 , such that the lighting assembly  820  is configured to emit light outwardly through a front portion of the lighting assembly  820 , as indicated by arrow  823 , rather than through side of a lighting assembly (e.g., as in lighting assembly embodiments of  FIGS. 2-13 ). Accordingly, the cooling system  100  may include a lighting assembly having a side emission configuration, a front emission configuration, and/or others. 
     The lighting assembly  820  includes a chassis  824  configured to receive and flow the fluid to cool the LED assembly  822 . As illustrated, the LED assembly  822  is disposed within and mounted to the chassis  824 . Additionally, the lighting assembly  820  includes a cover  826  coupled to the chassis  824 . The cover  826  is configured to at least partially enclose the lighting assembly  820 , such that the cover  826  directs the fluid through the lighting assembly  820  and over the LED assembly  822 . Additionally, the cover  826  may include clear, transparent, and/or semi-transparent materials such that the light emitted by the LED assembly  822  may pass through the cover  826  (e.g., after passing through the fluid) and outwardly from the cover  826 . For example, the cover  826  may be formed of a clear plastic and/or glass (e.g., borosilicate glass). In certain embodiments, the cover  826  may include poly(methyl methacrylate) (“PMMA”) and/or other acrylics and/or other materials described herein. 
     The chassis  824  includes a fluid inlet  830  configured to receive the fluid flowing along the cooling circuit  110  (e.g., as indicated by arrow  832 ) and a fluid outlet  834  configured to flow the fluid from the chassis  823  to the cooling circuit  110  (e.g., as indicated by arrow  836 ) (although the fluid direction may be reversed such that the fluid enters through the fluid outlet  834 , for example, and exits through the fluid inlet  832 ). Additionally, the chassis  824  includes a base  840  and a cylinder  842  extending from the base  840 . The base  840  includes the fluid inlet  830  and the fluid outlet  834 . In certain embodiments, the LED assembly  822  and/or the chassis  824  may be included in the lighting assembly and/or LED assembly of  FIGS. 2-13 . 
     The LED assembly  822  includes LEDs  850  mounted to a PCB  852 . The PCB  852  is mounted to the chassis  824  via connections  854 . For example, the PCB  852  includes a tab  856  extending over a ledge  858  of the chassis  824 . The connections  854  secure the LED assembly  822  to the ledge  858 . Additionally, the connections  854  may be electrical connections configured to provide power and/or electrical connections to the LEDs  850 . In certain embodiments, the PCB  852  may include an additional tab  856  disposed generally opposite the illustrated tab  856  and configured to mount to an additional ledge  858  of the chassis  824 . However, the additional tab  856  and the additional ledge  858  are omitted in  FIG. 14  for purposes of clarity. 
     The LEDs  850  of the LED assembly  822  are configured to emit light outwardly through the fluid flowing between the LED assembly  822  and the cover  826  (e.g., through an upper passage  860  of the cooling system  100 ) and through the cover  826 . In some embodiments, the cover  826  enclosing the fluid may be acrylic, polycarbonate, glass (e.g., borosilicate glass), or another material having a refractive index between about 1.44-1.5. Additionally, the refractive index of the LEDs  850  (e.g., the silicone), the fluid, and/or the cover  826  may generally be matched (e.g., within a difference threshold). 
     The cooling system  100  is configured to flow the fluid into the fluid inlet  832 , into the upper passage  860  extending between the LED assembly  822  and the cover  826  (e.g., as indicated by arrow  862 ), and into a lower passage  864  extending between the LED assembly  822  and the base  840  of the chassis  824  (e.g., as indicated by arrow  866 ). The fluid is configured to absorb heat generated by the LED assembly  822  (e.g., due to operation of the LEDs  850  and the PCB  852  and the light emitted by the LEDs  850 ) as the fluid flow through the upper passage  860  and the lower passage  864 . Additionally, because the fluid is generally transparent and/or semi-transparent (e.g., the fluid has a refractive index generally between 1.4-1.5), the fluid may have minimal/no effects on the light emitted from the LED assembly  822  and through the fluid. As such, the fluid may actively cool the LED assembly  822  during operation of the LED assembly  822  with little to no effect on a quality of light emitted from the LED assembly  822 . 
     The cooling system  100  is configured to flow the fluid from the upper passage  860  and into the fluid outlet  834 , as indicated by arrow  870 , and from the lower passage  864  into the fluid outlet  834 , as indicated by arrow  872 . After flowing the fluid over the LED assembly  822  and into the fluid outlet  834 , the pump  108  circulates the fluid through a heat exchanger  106  of the cooling system  100 , for example, to cool the fluid. 
       FIG. 15  is a perspective view of the lighting assembly  820  of  FIG. 14 . As described above, the cooling system  100  is configured to circulate the fluid into the fluid inlet  830  of the chassis  824 , over the LED assembly  822  of the lighting assembly  820 , and through the fluid outlet  834 , thereby cooling the LED assembly  822 . Accordingly, the lighting assembly  820  of  FIGS. 14 and 15  provides a front emission configuration of a lighting assembly and LED assembly that may be cooled via the cooling system  100 . 
       FIG. 16  is a flow diagram of a method  900  for controlling the cooling system  100  of  FIG. 1 . For example, the method  900 , or portions thereof, may be performed by the controller  120  of the cooling system  100 . The method  900  begins at block  902 , where the temperature at an LED assembly (e.g., the LED assembly  102 / 196 ) is measured. The sensor  121  may measure the temperature and output a signal (e.g., an input signal to the controller  120 ) indicative of the temperature at or adjacent to the LED assembly (e.g., a temperature at a surface of the LED assembly, a temperature of the fluid adjacent to and/or flowing over the LED assembly, a temperature at a surface of the enclosure  104 / 198 , etc.). The controller  120  may receive the signal indicative of the temperature. 
     At block  904 , the temperature at the LED assembly is determined. Block  904  may be performed in addition to or in place of block  902 . For example, block  902  may be omitted from the method  900 , and the sensor  121  may be omitted from the cooling system  100 . The controller  120  may be configured to determine the temperature at the LED assembly based on whether the LED assembly, or portions thereof, are emitting light and based on an amount of time that the LED assembly, or the portions thereof, have been emitting light. As generally described above, the controller  120  may be configured to control the LED assembly (e.g., by controlling which LED arrays  182  are emitting light, a duration that the LED arrays  182  emit light, an intensity of the light emitted by the LED arrays  182 , etc.). Based on the control actions, the controller  120  may determine/estimate the temperature at the LED assembly (e.g., the temperature at the surface of the LED assembly  102 / 196 , the temperature of the fluid adjacent to and/or flowing over the LED assembly  102 / 196 , the temperature at the surface of the enclosure  104 / 198 , etc.). 
     At block  906 , operating parameter(s) of the cooling system  100  are adjusted based on the temperature at the LED assembly (e.g., the temperature measured at block  902  and/or determined at block  904 ). For example, the controller  120  may output a signal (e.g., an output signal) to the pump  108  indicative of instructions to adjust the flowrate of fluid through the cooling circuit  110 . Additionally or alternatively, the controller  120  may output a signal to a heat exchanger (e.g., the heat exchanger  106 / 601 ) indicative of instructions to adjust a flow rate of air flowing over a radiator of the heat exchanger (e.g., by outputting a signal to fans of the heat exchanger  106 / 601  indicative of instructions to adjust a rotational speed of the fans to adjust the flow rate of air). In certain embodiments, the controller  120  may control the LED assembly based on the temperature at the LED assembly, such as by reducing a number of LED arrays emitting light and/or to prevent overheating of the LED assembly. 
     In certain embodiments, the controller  120  may compare the temperature at the LED assembly to a target temperature and determine whether a difference between the temperature (e.g., a measured and/or determined temperature at the LED assembly  102 / 196 ) and the target temperature is greater than a threshold value. Based on the difference exceeding the threshold value, the controller  120  may control the operating parameters of the cooling system  100  described above. As such, the controller  120  may reduce certain control actions performed by the cooling system  100  based on minor temperature fluctuations and/or may reduce an amount of air flow and/or power used by the heat exchanger to cool the fluid. The controller  120  may receive an input indicative of the target temperature (e.g., from an operator of the cooling system  100 ) and/or may determine the target temperature based on a type of LED included in the LED assembly, a type of fluid circulating through the cooling system  100 , a material of the enclosure, a material of the tower of the LED assembly, a size of the LED assembly and/or the cooling system  100  generally, or a combination thereof. 
     After completing block  906 , the method  900  returns to block  902  and the next temperature at the LED assembly is measured. Alternatively, the method  900  may return to block  904 , and the next temperature at the LED assembly may be determined. As such, blocks  902 - 906  of the method  900  may be iteratively performed by the controller  120  and/or by the cooling system  100  generally to facilitate cooling of the LED assembly and the enclosure. 
     While only certain features of the disclosure have been illustrated and described herein, many modifications and changes will occur to those skilled in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the disclosure. 
     The techniques presented and claimed herein are referenced and applied to material objects and concrete examples of a practical nature that demonstrably improve the present technical field and, as such, are not abstract, intangible or purely theoretical. Further, if any claims appended to the end of this specification contain one or more elements designated as “means for [perform]ing [a function] . . . ” or “step for [perform]ing [a function] . . . ”, it is intended that such elements are to be interpreted under 35 U.S.C. 112(f). However, for any claims containing elements designated in any other manner, it is intended that such elements are not to be interpreted under 35 U.S.C. 112(f).