Abstract:
The integrated laboratory light (lablight) fixture is a sealed ceiling mounted fixture that combines air outlets, lighting and other devices for use in laboratory, clean room, healthcare, educational, and other facilities requiring critical airflow control. The integrated lablight is made for a central location in the lab to eliminate room scale eddies and cross drafts along with the hood challenges they present. The combining of most ceiling devices in one fixture results in a safer environment with greater access for above ceiling maintenance, as well as less expensive facility capital costs. The fixture design also minimizes shadows at the work surface, and promotes temperature stability for temperature sensitive equipment.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This patent application is a continuation-in-part of U.S. patent application Ser. No. 11/520,437, filed Sep. 12, 2006, which claims priority to U.S. Provisional Patent Application No. 60/716,045, filed Sep. 12, 2005, and which are incorporated herein by reference in their entirety. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present invention relates to an integrated laboratory light fixture, which combines a light, an air vent, and other device fixtures for use in a suspended ceiling grid or Sheetrock® (e.g. drywall or plaster wallboard) system, and more particularly to an integrated laboratory light fixture design that promotes safety in facilities with critical airflow pattern requirements (such as labs, pharmaceutical, food, medical and healthcare applications), and reduces facility capital, energy and operating costs. 
       BACKGROUND OF THE INVENTION 
       [0003]    Suspended ceiling systems are extensively used throughout the construction industry, both in new building construction and in the renovation of older buildings. A suspended ceiling consists of a grid-like support base suspended from the overhead structure, the base supporting a layer of ceiling panels. In addition, the suspended grid frequently serves as a support base for lighting fixtures and heating and air conditioning outlets, fire sprinklers, sensors, detectors, monitors, enunciators, speakers, and other such items. Ceiling space constraints often create difficult choices in controlled environment facilities because of competition for the optimum air outlet locations. Whenever hoods or containment devices are lined up at the room perimeter, the best air outlet locations are in the center, which is often where the benchtops and lighting are needed. The competition for space with lighting and other ceiling devices may lead to imperfect air outlet locations and potentially undesirable large scale airflow patterns (eddies). Many times the dynamic controls for the room HVAC (heating, ventilating and air-conditioning) system contributes to variable large scale airflow eddies which decrease the containment efficiency of hoods and other exhausted devices. These eddies create cross drafts that impair proper hood functioning. Usually, cross drafts require hood performance enhancements through increased exhaust and supply air flow rates, which lead to increases in energy costs. The design engineers must address all of these concerns, but the equipment available today does not lead to easy solutions. Once these considerations are addressed in high tech facilities, much of the ceiling tiles are no longer removable because of the devices rigidly mounted in them. This leads to difficult compromises that impair above ceiling access and facility maintenance operations. 
         [0004]    There have been several past combination lighting and HVAC fixtures, but most applications have been intended for ceiling mounted clean room filtration. These inventions do not address the safety issues of hazardous compound containment devices (hoods and other exhausted cabinets) by promoting uniform room scale airflow patterns and minimizing cross drafts. In addition, the energy efficiency of the lighting and airflow control has not been combined in other products currently available. A fixture with a design focused on recyclability and is made from mostly recycled materials is not available today, but is needed in Green Building applications. 
       SUMMARY OF THE INVENTION 
       [0005]    The present invention has as an underlying objective, the improvement of controlled environment facility safety while improving life cycle facility costs. The integrated laboratory light fixture (or “lablight’) resolves the problem of competition for the ceiling space in the center of facilities with containment devices along the perimeter walls. In doing so, the capital costs of ceiling mounted equipment and associated installation costs are reduced. The operating cost of the facility is minimized by preventing hood airflow increases to resolve cross draft problems. Also, facility reliability enhancements come from improved above ceiling access inherent in the integrated design philosophy. 
         [0006]    The integrated lablight provides shadow free lighting of various intensities along with air outlets and locations for a wide variety of other ceiling mounted devices. This improves facility installations by ensuring the design intent is not compromised through unintended air outlet or lighting locations; the ceiling device locations are built in to the integrated lablight so the design intent is correctly applied every time. 
         [0007]    The integrated lablight is comprised of light fixtures designed to provide various levels of shadow free light on a work surface along with air outlets for room temperature control and ventilation. The top surface and central structure are joined with a bottom plate to form a rigid, air tight structure. An air supply duct connection point in the center of the upper portion routes air through a flow straightener then an adjustable flow splitter. The air then flows around the central light fixture and out through a series of slots arranged symmetrically perpendicular to the fixture axis. The air slots are designed to minimize turbulence and eddies while promoting air mixing for temperature stability. The airflow pathway keeps the light lenses free from dust by washing over the lens surfaces. At the fixture perimeter is a dark colored lip to enhance ambient room air mixing with the supply air stream while providing a concealed area for ambient dust collection. This provides protection for the light fixtures and a convenient method of fixture cleaning. 
         [0008]    The lighting is designed to provide consistent, uniform and shadow free lighting at a work surface below. Two or three lighting locations within the fixture minimize the opportunities for shadows on work surfaces. Also, the lighting type and strength may be configured for many specific job applications. A variety of lighting types, lenses and diffusers, reflector shapes and designs are matched to client requirements including fluorescent multiple tube fixtures, LED (light emitting diode), sodium, incandescent, and metal halide. 
         [0009]    The integrated lablight attaches to the ceiling structure (Sheetrock® (e.g. drywall or plaster wallboard) or suspended ceilings) for a sealed air tight installation. The lighting equipment (including ballasts, transformers, etc.) is located in the upper area for cooling by ambient plenum air above the ceilings. A variety of electrical power connection locations provide flexibility in tightly constrained ceiling spaces. The designated locations for mounting other ceiling devices frees up maintenance accessibility for faster diagnostics, problem resolutions and future facility modifications. The integrated temperature sensor locations accommodate stable lab environmental controls with locations for ambient and supply air temperature sensors. The overall integrated design philosophy saves equipment, installation, and operating costs and results in safer labs. 
         [0010]    A variable air volume (VAV) hood control systems are common because they provide the most value in a market of increasing energy costs. The resultant dynamic conditions may contribute to hood challenges and must be considered in the design process. Occupant thermal comfort may be impacted when the control system compensates for rapid changes in airflow requirements, because the reheat water valve may not respond quickly enough. When a VAV hood sash is opened, the supply and exhaust air flows increase rapidly to compensate for the sudden demand. Lab personnel may be subjected to colder than normal air unless the heating hot water valve anticipates the increased supply air flow rate. The correct amount of heating hot water supply is best determined from diffuser discharge air temperature measurement in addition to room ambient temperature. The integrated lablight provides engineered mounting locations to ensure proper temperature control measurement of supply air temperature and ambient room temperature. The integrated design removes the opportunities for unplanned changes in device location in the construction phase of facility procurement, so the designer&#39;s intent is guaranteed to be implemented for increased safety and effectiveness. 
         [0011]    In accordance with one embodiment, a ceiling mounted sealed fixture that enhances safety by providing designers with lighting in combination with a uniform, even, and optimized air flow source, and a mounting location for other ceiling devices; this arrangement supports an integrated design approach that results in minimizing cross drafts to facilitate the containment of hazardous substances; optimizing maintenance access by reducing ceiling space constraints, provide uniform lighting with a minimum of shadows, and saving capital and operating costs for building owners; the combining of lighting with air vents enables HVAC designers to use space over tabletops for air registers to optimize room level airflow patterns without sacrificing lighting quality; the multiple light sources inherent in the integrated lablight represent an improvement over current lighting designs by providing uniform light intensity while minimizing worksurface shadows; the integrated lablight fixture provides precise locations for temperature control sensors, which promotes improved temperature stability for temperature sensitive equipment located below the fixture; for rooms with significant containment exhaust requirements, the fixture (lighting and supply air outlet) is designed to be located along the lab&#39;s central axis to create a sweeping airflow from center of the lab to the perimeter; the linear shape of the fixture enables their alignment in a row along the center of a lab to maximize the overall room airflow patterns and ambient air mixing; for rooms with excessive heat generating equipment, the fixture can be used in the exhaust mode; an integrated fixture that provides a room side means of adjustment for overall airflow and symmetry of airflow; the use of CFD analysis to optimize the surface features of the air vent design to achieve desired room level airflow patterns; fluorescent tube T-5 fixture with reflector (parabolic, non-linear or other type) and/or luminare lens to optimize lighting uniformity or focus over desired surfaces; CFD (compact fluorescent device) instead of fluorescent tube in item  1   g ; LED instead of fluorescent in item  1   g ; light lens remains dust free with layer of supply airflow, and a perimeter ambient air guide trough promotes the cleanliness of the fixture and lighting lenses by intercepting any room dust or debris due to the aerodynamic design; an airflow exit slot designs and exit velocities are designed to deliver low speed, uniform airflow with any potential eddies oriented in the axial direction to minimize eddies in the transverse direction. This arrangement allows optimized room level airflow patterns when the fixtures are mounted in a central line; it promotes strong and consistent room air mixing for temperature stability while minimizing cross drafts, which may impair the operation of hoods; and fixture housing provides a seal at the ceiling level to minimize unwanted air transfer between the room and the adjacent areas; fixture design can support a dimmable lighting system with remote control connection points. 
         [0012]    In accordance with a further embodiment, a fixture for suspended ceiling systems, comprising Sheetrock® (e.g. drywall or plaster wallboard) or other ceilings that improves overall above ceiling access by providing integral locations for many common ceiling mounted devices; a fixture that eliminates the design conflict between providing air supply and lighting over lab tables; a fixture that provides mounting points for room air and supply air temperature sensors, air quality sensors such as CO 2 , O 2 , VOC and other detectors, optical and acoustic sensors, radiation and other sensors, sprinkler heads, pressure ports, and environmental monitoring devices; another advantage of the present invention is the arrangement options for locations of electrical connections. The electrical power for the fixture can be connected on the top or the side of the fixture; the low profile and truncated corner edges enable the integrated lablight to be applied in installations with extreme space limitations. 
         [0013]    In accordance with another embodiment, a fixture that saves building owner&#39;s money by: eliminating the installation and material handling costs of the air vent (connection costs are retained); minimizes air balancing and commissioning costs associated with non-optimized room level airflow patterns; generally reduces maintenance costs and maintenance response times by improving access to above ceiling devices; reducing costs for installing controls and sensors due to ceiling mounted location with no trim requirements a fixture that saves energy by minimizing airflow increases required for improving hood containment due to excessive room cross drafts, and by providing energy efficient lighting cooled by ceiling plenum air; low profile saves costs with less material used in fabrication; fixture material is predominantly recycled and recyclable; other applications include any room where airflow patterns are critical to the functioning of the facility; other applications include rooms where ceiling space is limited; other applications include rooms where ventilation and lighting are both needed in the same location. 
         [0014]    In accordance with a further embodiment, a ceiling mounted fixture comprises: at least one longitudinal arrangement of at least one air vent adapted to receive an air supply; and at least two longitudinal arrangements of at least one light source, and wherein the at least one longitudinal arrangement of at least one air vent is positioned between the at least two longitudinal arrangements of light sources. 
         [0015]    In accordance with another embodiment, a fixture comprises: a central light source; an air supply duct having a connection point in a center portion of the fixture; and a flow straightener, wherein the flow straightener routes an air supply through an adjustable flow splitter and around the central light source and out through a series of slots arranged symmetrically perpendicular to an axis of the fixture. 
         [0016]    In accordance with a further embodiment, a ceiling mounted fixture system adapted to be located along a lab&#39;s central axis to create a sweeping airflow from a center portion of the lab to a perimeter thereof comprises: a plurality of linear fixtures comprising: a central light source; an air supply duct having a connection point in a center portion of the fixture; and a flow straightener, wherein the flow straightener routes an air supply through an adjustable flow splitter and around the central light source and out through a series of slots arranged symmetrically perpendicular to an axis of the fixture; and wherein the plurality of linear fixtures are aligned in a row along the center portion of the lab to maximize the overall room airflow patterns and ambient air mixing. 
         [0017]    In accordance with another embodiment, a ceiling mounted fixture comprising: at least one longitudinal arrangement of at least one air vent, which receives an air supply; an air return located in a center portion of the fixture; and at least one light source. 
         [0018]    In accordance with a further embodiment, a ceiling mounted fixture comprising: a fixture housing having a rectangular design, wherein a ratio of a length of the fixture housing to a width of the fixture housing is approximately 1 to 1; at least one longitudinal arrangement of at least one air vent, which receives an air supply; air supply guides, which assist with directing a flow of the air supply from the at least one longitudinal arrangement of at least one air vent; an air return located in a center portion of the fixture; and at least one light emitting diode (LED), which is located on an upper surface of the return and emits a beam of light, which reflects off a plurality of light reflectors located on an interior surface of the fixture. 
         [0019]    Other details, objects, and advantages of the invention will become apparent as the following description of certain present preferred embodiments thereof and certain present preferred methods of practicing the same proceeds. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0020]    Present preferred embodiments of an integrated laboratory light, and methods of making and/or assembly of such devices are shown in the accompanying drawings in which 
           [0021]      FIG. 1  is a side elevational view of the shorter length, in cross section, showing a suspended laboratory light and ventilation fixture as mounted in a ceiling. 
           [0022]      FIG. 2  is a side elevational view of the longer length, in cross section, showing additional details relating to additional ceiling device mounting locations and airflow guide designs. 
           [0023]      FIG. 3  is a bottom view showing a room side depiction of the laboratory lighting and air outlets and the airflow guiding surfaces. 
           [0024]      FIG. 4  is an exploded view of a suspended light and ventilation fixture. 
           [0025]      FIG. 5  is a side elevation view of an integrated laboratory light fixture in accordance with another exemplary embodiment. 
           [0026]      FIG. 6  is a bottom view of the integrated laboratory light fixture as shown in  FIG. 5 . 
           [0027]      FIG. 7  is a side elevation view of an integrated laboratory light fixture in accordance with another exemplary embodiment. 
       
    
    
     DETAILED DESCRIPTION 
       [0028]    Throughout the following description, specific details are set forth in order to provide a more thorough understanding of the invention. However, the invention may be fabricated without these particulars. In other instances, well known elements have not been shown or described in detail to avoid unnecessarily obscuring the invention. Accordingly, the specification and drawings are to be regarded in an illustrative, rather than a restrictive, sense. 
         [0029]    The integrated laboratory light fixture  100  may take form in various components and arrangements of components, and in various steps and arrangements of steps. Slight modifications and variations to fit specific needs of designers are included in this invention. The drawings are only for purposes of illustrating a preferred embodiment and are not to be construed as limiting the invention. 
         [0030]    The integrated lablight combines lights and HVAC air outlets to promote lab safety by minimizing hood cross drafts. Usage of the fixture also leads to equipment, installation labor, and energy cost savings for lab owners. 
         [0031]    The containment effectiveness of hoods is impaired by cross drafts near the hood face. Good lab designs avoid the placement of supply air outlets near hoods to prevent cross drafts. The air turbulence from cross drafts causes fumes to escape from the hoods, which pose health risks for lab occupants. 
         [0032]    Many dense lab layouts arrange the containment devices (fume hoods, exhaust cabinet, etc.) along the perimeter with lab tables in the center. These layouts are best supported with air supply outlets along the central axis of the ceiling to avoid interfering with hood operation. Often this central ceiling space is used for light fixtures over the central tables, and the air outlets are located elsewhere. In addition, other ceiling devices compete with air outlets for best locations, such as fire sprinklers, sensors, detectors, speakers and specialty lights. Additional air outlet location restrictions come from above ceiling maintenance access pathways, which must be left clear to support proper lab operations. 
         [0033]    These competing requirements for ceiling space often result in less than optimum air distribution patterns that can interfere with hood containment. Air balancing and commissioning activities may require increases in hood airflow rates to ensure lab safety, which increases energy consumption requirements. Many times proper hood function requires the relocation of some supply air outlets in addition to increasing exhausted air flow quantities. In all cases, reducing laboratory cross drafts improves hood containment effectiveness and enhances safety for the occupants. 
         [0034]    New fume hoods that require lower airflow rates are becoming commercially available and offer safe lab designs with less costly facilities. Many low airflow rate containment technologies are sensitive to interferences from cross drafts, so minimizing lab cross drafts will become increasingly important. In these ways, the usage of the Integrated Lab Light will promote lab safety, increase lab energy efficiency, save owners capital costs, and promote the usage of low flow containment devices for life cycle value enhancement. 
         [0035]    The integrated lablight presents a relatively inexpensive and easily manufactured fixture which can be fabricated in a variety of different configurations for different design applications. The fabrication strategy focuses on sustainable practices (recyclable, energy efficiency) to provide facility owners with increased choices for environmental responsibility. However, it is to be understood that various changes can be made in the arrangement, form and construction of the apparatus disclosed herein without departing from the spirit and scope of the invention. 
         [0036]      FIG. 1  is a side elevational view of the shorter length, in cross section, showing a laboratory light fixture  100  (or lablight fixture) as mounted in a ceiling. The short side of the 2′×4′ integrated lablight fixture  100  is shown in  FIG. 1 . As shown in  FIG. 1 , the laboratory light fixture  100  includes a top portion preferably comprised of a round sheet metal duct connection, which forms a round duct connection  1  with a beaded collar  2  to secure a supply air flexible duct with a hose clamp. Air flows down the round section through an air flow straightener  3  to promote even air distribution, then into a plenum with an air flow guide  4 , which is preferably a curved air guides. On either side of the air outlets, light fixtures are located with reflectors  5 , light bulbs  6 , and lighting diffusers  7  (or lighting lens). 
         [0037]    The integrated lablight can be supported in Sheetrock® (e.g. drywall or plaster wallboard) or T-bar ceilings with a strong gasket and clamped perimeter trim  8 . A dark colored perimeter aerodynamic trough  9  (or air ambient air guide) catches ambient room dust and debris to minimize dirt concentrations on the light diffusers  7 . The location to mount fire sprinklers or other sensors or devices to the integrated lablight fixture  100  is shown in this view. The air outlets  11  are preferably shaped and oriented to enhance air supply mixing while minimizing room level turbulence and eddy currents. 
         [0038]    It can be appreciated that the air outlet orientation is designed to wash the lighting diffusers with supply air, which is usually filtered at the air handler. This shape of the air plenum and lighting diffusers guides the supply air over the interior surfaces which helps keep the light diffusers clean to enhance lighting output. The interior air mixing plenum shape  14  (or air flow mixing area) promotes good room air mixing for ambient room temperature control and stability. The lighting diffuser  12  as shown in  FIG. 1  can include an optional third light for higher light output. A central light reflector and a central air flow adjustment guide  13  compensate for any residual eddies resultant from the HVAC air distribution system configurations. 
         [0039]      FIG. 2  is a side elevational view of the longer length, in cross section, showing more details relating to additional ceiling device mounting locations and airflow guide designs. As shown in  FIG. 2 , the adjustment points for the central air flow adjustment guide include a structural reinforcement  16  to secure the fixture&#39;s shape, and a seismic hanger location  17  for code required support. The fixture also preferably includes a unit support hanger flange with an opening  18 , which provides structural and/or seismic support. 
         [0040]      FIG. 3  is a bottom view showing a room side depiction of the lighting and air outlets and the airflow guiding surfaces. As shown in  FIG. 3 , the fixture includes at least one row of air vents or air flow guides  4  and at least two rows of light assemblies comprised of a light bulb  6 , a light reflector  5 , and a light diffuser or light lens  7 . The at least one row of air vents or air flow guides  4  are preferably positioned between the at least two rows of light sources. The fixture preferably has a ratio of length to width of approximately 2 to 1. However, it can be appreciated that the length to width ratio can vary from about 8 to 1 (8:1) to about 1 to 1 (1:1), wherein the length and width of the fixture are approximately equal. 
         [0041]    As shown in  FIG. 3 , the fixture  100  preferably includes at least one longitudinal arrangement of at least one air vent  21  adapted to receive an air supply, and at least two longitudinal arrangements of at least one light source  6 , wherein the at least one longitudinal arrangement of at least one air vent  21  is positioned between the at least two longitudinal arrangements of at least one light source  6 . However, it can be appreciated that the fixture  100  can have 1 to 5 longitudinal arrangements (or rows) of light sources or lights  6  and an equal amount, one more, or one less longitudinal arrangements (or rows) of air vents  21  or air flow guides. In addition, the fixture  100  can include at least one temperature control sensor, which promotes improved temperature stability for temperature sensitive equipment located below the fixture. As shown in  FIG. 3 , the fixture  100  includes two longitudinal arrangements of air vent  21  and three (3) longitudinal arrangements of light sources  6 , in the form of a tubular light. 
         [0042]      FIG. 4  is an exploded view of the suspended light and ventilation fixture  100 . As shown in  FIG. 4 , the fixture  100  includes a duct connection  1 , which is preferably round, a beaded collar  2 , an air flow straightener  3 , an air flow guide  4 , a light reflector  5 , at least one light bulb  6 , a light lens or light diffuser  7 , a ceiling support structure  22 , an ambient air guide  9 , an edge of fixture (in background)  10 , an optional third light lens  23 , an optional third light reflector  24 , an air flow adjustment guide  13 , an air flow mixing area  14 , a plurality of air flow discharge slots  15 , an air flow guide  25 , an edge of fixture  26 , a structural/seismic support  27 , a sprinkler head location or ambient sensor location  19 , and a supply air sensor  20 . The fixture  100  also includes a structural/seismic support location, a central air flow adjustment guide, and an electrical connection, which is preferably a 120 volt/1 inch/60 watt electrical connections with ¾ inch spiral conduit. However, it can be appreciated that any suitable electrical connection can be used. The fixture  100  is preferably constructed of aluminum or other suitable material, which can be recycled or constructed of a material, which is recyclable. 
         [0043]    It can be appreciated that a plurality of integrated laboratory light fixtures  100  can be used to supply an airflow, discharge an airflow, and control an ambient airflow, wherein the ambient airflow is room air that comes in from the side and mixes with the supply air to help maintain overall room temperature uniformity. The fixture  100  is preferably adapted to be located along a clean room&#39;s central axis to create a sweeping airflow from center of the lab to the perimeter. In accordance with one embodiment, an array of fixtures  100  can be aligned in a row along the center of a lab to maximize a room&#39;s airflow patterns and ambient air mixing. Alternatively, it can be appreciated that the fixture  100  can be used in the exhaust mode for rooms with excessive heat generating equipment. In accordance with another embodiment, the fixture  100  further provides a perimeter ambient air guide trough, which promotes the cleanliness of the fixture  100  and lighting lenses by intercepting any room dust or debris due to the aerodynamic design. In addition, the fixture  100  can include an airflow exit slot designs and exit velocities are designed to deliver low speed, uniform airflow with any potential eddies oriented in the axial direction to minimize eddies in the transverse direction. 
         [0044]    In accordance with a further embodiment, the fixture  100  can include mounting points for room air and supply air temperature sensors, air quality sensors such as CO 2 , O 2 , VOC and other detectors, optical and acoustic sensors, radiation and other sensors, sprinkler heads, pressure ports, and environmental monitoring devices. 
         [0045]    Various other objectives, advantages, and features of the present invention will become readily apparent from the ensuing detailed description, and the novel features will be particularly pointed out in the appended claims. As shown in  FIGS. 1-4 , the following reference numbers correlate to the following elements:
         1 —Round duct connection     2 —Beaded Duct Collar     3 —Air Flow Straightener     4 —Air Flow Guide     5 —Light reflector     6 —Light bulb or lamp     7 —Light Lens/diffuser     8 —Ceiling support structure     9 —Ambient air guide     10 —Edge of fixture (in background)     11 —Optional third light lens     12 —Optional third light reflector     13 —Air flow adjustment guide     14 —Air flow mixing area     15 —Air flow discharge slots     16 —Air flow guide     17 —Sheet metal shroud     18 —Unit Support Hanger Flange with hole     19 —Sprinkler head location or ambient sensor location     20 —Supply Air Sensor Location       
 
         [0066]    It can be appreciated that in some applications, where it is desirable to have indoor environmental control, a rectangular and more preferably, a square integrated laboratory light fixture (i.e., 2′×2′) is more appropriate. For example, for applications with ceiling mounted return or exhaust registers, localized environmental control is best achieved economically with a square fixture (i.e., a fixture having sides of equal length). 
         [0067]      FIGS. 5 and 6  are a side elevation view and a bottom view, respectively, of an integrated laboratory light fixture  200  in accordance with another exemplary embodiment. As shown in  FIGS. 5 and 6 , the light fixture  200  comprises a housing  210 , which includes at least one longitudinal arrangement of at least one air vent (or air supply outlet)  220  adapted to receive an air supply (not shown), a return  260  located in a center portion of the fixture  200 , and at least one light source  250 . In accordance with an exemplary embodiment, the ratio of the length  202  of the fixture housing  210  to the width  204  of the fixture housing  210  is approximately 1 to 1 (1:1). It can be appreciated that a smaller fixture  200  as described herein is more economical for owners, and provides more design flexibility for challenging applications. In accordance with an exemplary embodiment, the fixture  200  is preferably configured to be mounted in a T-bar ceiling and/or a Sheetrock® surface (not shown). 
         [0068]    In accordance with an exemplary embodiment, the ceiling mounted fixture  200  has a rectangular or square configuration, which includes at least one longitudinal arrangement of at least one air vent (or supply air outlets)  220  on opposite edges thereof, a central air return  260  and a central light source  250 . As shown in  FIGS. 5 and 6 , the ceiling mounted fixture  200  includes a square fixture housing (or housing having four approximately equal sides)  210 , at least one row of air outlets  220  adapted to receive an air supply, the at least one row of air outlet located on opposite edges (on either edge side thereof) of the square housing  210 , and at least one light source  250  located in a center portion of the housing  210 . Each of the at least one longitudinal arrangement of at least one air vent (or supply air outlets)  220  is comprised of a longitudinal slot extending from one edge of the housing  210  to an opposite edge thereof. 
         [0069]    In accordance with an exemplary embodiment, the fixture is approximately 2 feet by 2 feet, and each of the at least one row of air outlets  220  are approximately 4″×24″ slots with a plurality of interior fins  222 , which act as air guides. It can be appreciated that in accordance with an exemplary embodiment, the at least one longitudinal arrangement of at least one air vent  220  comprises at least two rows of air outlets on opposite edges or sides of the fixture  200 . The fixture  200  also preferably includes a return air tie point  280 , and a supply connection  290 , which are configured to connect with and/or be attachable to a return duct and an air supply duct, respectively. 
         [0070]    In accordance with an exemplary embodiment, the fixture  200  includes a central return air opening  260  located within the center portion of the housing  210 . The central return air opening  260  preferably includes a sensor platform  240 , which is configured to receive or house at least one sensor  242 . The at least one sensor  242  can be a fire alarm, a thermal sensor, a chemical sensor, an occupancy sensor, a light sensor, a particle sensor, a humidity sensor and/or any combination thereof. 
         [0071]    The at least one light source  250  is preferably located on an interior region of the housing  210 , which includes the return air opening  260 , which has a central vent or return air opening or channel  270  for return airflow. The central vent  270  extends from the return air opening  260  upward to a return vent. In accordance with an exemplary embodiment, the at least one light source  250  is an LED (light emitting diode), which provides even coverage across an interior surface  230  of the fixture  200 . The at least one light source or LED  250  preferably emits a beam of light, which reflects off the interior surface  230  of the fixture  200 , which includes a plurality of light reflectors  232 . The interior surface  230  of the fixture  200  preferably forms a pyramid shape with four similar sized panels, and having In accordance with an exemplary embodiment, the LED is a LED based light arrangement comprised of one or more LEDs, which are configured to emit light in a desired configuration and/or arrangement. It can be appreciated that the at least one light source  250  can be located on an upper surface of the sensor platform  240  and/or alternatively, on or inside the sensor platform  240 . 
         [0072]      FIG. 7  is a side elevation view of an integrated laboratory light fixture  300  in accordance with another exemplary embodiment. It can be appreciated that in most applications, thermal control over a local environment is not only desirable, but on many occasions may be required. In accordance with an exemplary embodiment, this function can be provided to a laboratory light fixture  300  economically by adding a thermal heat exchange coil or section  330  to the supply air connection. The thermal heat exchange coil (or thermal heat exchange section)  330  preferably includes a heating and/or cooling coil control valve (not shown), which controls the heat transfer fluid flow rate from the thermal heat exchange coil  330  to the air supply. In particular, by including a control valve, the heat transfer rate to the supply air can be controlled. In accordance with an exemplary embodiment, the control valve preferably includes a quick disconnect and/or shut off valves for heating and cooling fluid piping. In addition, with integral controls and automation system interfaces, the fluid control valves can modulate to maintain the desired environmental conditions. 
         [0073]    In accordance with another exemplary embodiment, an internal fan (or recirculation fan)  320  can be added, which mixes the return air with supply air through the heat exchange coils as needed to maintain thermal set points. In accordance with an exemplary embodiment, the internal fan  320  is automatically switched off during periods of no thermal demand or no occupancy, along with the light source  250  (i.e., LEDs). In addition, this recirculation feature can include at least one or more internal sensors ( FIG. 5 ,  242 ), which provide local control over the indoor environment for improved indoor environmental quality over existing common designs. It can also be appreciated that by locating the fixture  300  directly over a personal workspace, this allows the supply air to surround occupant while the return air pathway is naturally heat driven by the occupant and equipment for improved energy efficiency and ventilation effectiveness over other technologies. In addition, the optional internal fan option enables a mix of supply and return air to enhance thermal heat transfer between the air and fluid. 
         [0074]    As shown in  FIG. 7 , the fixture  300  includes a thermal heat transfer coil  330 , which is in communication and/or attached to an air supply duct connection  310 . The thermal heat transfer coil  310  provides heating and cooling for thermal control of the fixture  300 . In accordance with an alternative embodiment, instead of combination heating and cooling thermal heat transfer coil  330 , the thermal heat transfer coil  330  can be comprised of a separate heating coil and a separate cooling coil. In addition, the thermal heat transfer coil  330  can include fins attached to sheets expanded around suitable tubing. The tubing is preferably made of copper, aluminum and/or suitable materials. 
         [0075]    In accordance with an exemplary embodiment, the interior surfaces of the fixture  300  are comprised of a plurality of heat transfer surfaces arranged so that the interior surfaces  270  and internal air guides are made of a heat transferable material. For example, the interior surfaces of the fixture  300  can be fabricated from at least two sheets of aluminum press fitted and/or thermally attached together to create fluid pathways, which internally optimized the fixture  300  for maximum heat transfer with minimum material and energy consumption through air and fluid flow friction 
         [0076]    It will be understood that the foregoing description is of the preferred embodiments, and is, therefore, merely representative of the article and methods of manufacturing the same. It can be appreciated that variations and modifications of the different embodiments in light of the above teachings will be readily apparent to those skilled in the art. Accordingly, the exemplary embodiments, as well as alternative embodiments, may be made without departing from the spirit and scope of the articles and methods as set forth in the attached claims.