Patent Publication Number: US-9409196-B1

Title: Light assembly for spray paint gun

Description:
RELATED APPLICATIONS 
     This application is a continuation-in-part of U.S. non-provisional patent application Ser. No. 13/564,905 filed on Aug. 2, 2012, which is incorporated herein by reference. 
     U.S. Non-provisional patent application Ser. No. 13/564,905 claimed the benefit of U.S. Provisional Patent Application Ser. No. 61/514,328 having an application date of Aug. 2, 2011 which is also incorporate herein by reference. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to a light assembly that can be mounted to paint spray gun for illuminating an area being painted by a paint sprayer. 
     BACKGROUND OF THE INVENTION 
     The process of spraying paint on a surface, particularly spraying paint on the surface of a vehicle such as an automobile, is a process that requires a high degree of skill if a coating of paint is to be applied to a surface that is uniform and flawless. Typically, the paint is applied using a hand held paint gun that is connected to a pressurized air source so that paint is directed as a pattern of fine paint droplets toward the working surface. As is the case with any such highly skilled effort, it is important that the craftsperson doing the work be able to clearly see the surface as it is being painted. Often in a spray painting process, the surface being painted is illuminated by lights mounted in the paint room. Unfortunately, it is often the case that the painter is positioned between the light source and the surface being painted. This causes a shadow to be cast on the work surface that, in turn, makes it difficult for the painter to visualize the surface as it is receiving paint. What is needed is a lightweight, compact lighting system which can be mounted to a paint gun that will produce a generally uniform field of illumination in an area at least as extensive as the area that is sprayed with paint as the painter moves the paint gun over a workpiece surface. 
     SUMMARY 
     The above stated need is addressed by a light assembly for spray paint guns. The light assembly is adapted for mounting to a paint spray gun of the type having a handle, a gravity feeding paint container mounted above the handle having a neck portion that is received by a paint inlet fitting at the top of the handle and a forwardly projecting nozzle assembly including an externally threaded generally cylindrical nozzle portion and a removable internally threaded spray nozzle fitting that threads onto the nozzle portion. The light assembly includes a light bracket, light modules and a power pack. The light bracket is shaped to fit around the paint gun nozzle and includes a generally flat thin mounting plate portion having a generally circular opening that receives the nozzle portion of the spray gun. The light bracket generally hangs on the nozzle portion and is held in place when the spray nozzle fitting is threaded onto the externally threaded nozzle portion. The light bracket includes a top flange that extends back from the top edge of the mounting plate. The rear edge of the top flange of the light bracket has at least one centered scallop that receives the paint inlet fitting at the top of the handle. Thus, when the nozzle fitting is threaded into place, the light bracket is pushed back so that the scallop of the top flange engages the paint inlet fitting. The light modules are secured to the light bracket. A power pack is also secured to the light bracket. In this example, the power pack is also mounted to the light bracket and is adapted to hold standard sized small batteries, such as, for example, a set of AAA batteries. Preferably a switch is provided in a circuit that includes the batteries and the light modules. In this example, the lights include a plurality of compact LED lights that are arranged around the nozzle assembly in light modules and are selected, arranged and oriented to produce a generally uniform area of illumination that encompasses the paint spray pattern area. Accordingly, with the lights activated, the painter is able to easily see the paint as it is sprayed on to a workpiece surface. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of the spray paint gun light assembly mounted to a spray paint gun. 
         FIG. 1A  is a sectional view taken from plane A-A of  FIG. 1 . 
         FIG. 2  is a first perspective view of the spray paint gun light assembly. 
         FIG. 3  is a second perspective view of the spray paint gun light assembly showing a second embodiment for the second light module. 
         FIG. 4  is a front view of the spray paint gun light assembly. 
         FIG. 4A  is a sectional view of one the left side light module taken from plane A-A of  FIG. 4 . 
         FIG. 5  is perspective view of a second embodiment of a spray paint gun light assembly. 
         FIG. 6  is a perspective view of a third embodiment of the spray paint gun light assembly. 
         FIG. 7  is a front view of the third embodiment of the spray paint gun light assembly showing a changeable nozzle fitting. 
         FIG. 8  is a rear view of the third embodiment of the spray paint gun light assembly. 
         FIG. 9  is a side view of the third embodiment of the spray paint gun light assembly. 
         FIG. 10  is a top view of the third embodiment of the spray paint gun light assembly showing a changeable sprayer neck fitting. 
         FIG. 11  is a perspective view of the fourth embodiment of the spray paint gun light assembly shown mounted to a paint spray gun. 
         FIG. 12  is a perspective exploded view of the fourth embodiment of the spray paint gun light assembly. 
         FIG. 13  is a perspective view showing a spray paint gun spraying paint on a surface. 
         FIG. 14  is a section view taken from plain A-A indicated in  FIG. 13 . 
         FIG. 15  is a side view showing a spray gun with a fourth embodiment spray gun light assembly in relation to a workpiece WP which is being painted. 
         FIG. 15A  is a plan view of the workpiece shown in  FIG. 15  taken from plane A-A indicated in  FIG. 15  which shows spray pattern position indicator shadows on a work surface when the fourth embodiment spray gun light is used to illuminate the work surface. 
         FIG. 16A  is a cross section view of the battery compartment of the fourth embodiment spray gun light showing the light circuit in the off position. 
         FIG. 16B  is a cross section view of the battery compartment of the fourth embodiment spray gun light showing the light circuit in the on position. 
         FIG. 17  is a top view of a fifth embodiment of the spray gun light assembly. 
         FIG. 17A  is a cross section view of the fifth embodiment of the spray gun light assembly taken from plain A-A of  FIG. 17 . 
     
    
    
     DETAILED DESCRIPTION 
     A paint spray paint gun light assembly  10  is shown in  FIG. 1  mounted to a paint spray gun  5 . As can be seen in  FIG. 1 , spray paint gun  5  includes a handle  5 A which is fed by an air intake fitting  5 A 1  for receiving pressurized air, a control trigger  5 B, a paint container  5 C and a spray nozzle  5 D. Paint container  5 C has a neck portion  5 E which is received by a paint inlet fitting  7  located at the upper end of spray paint gun  5  as shown in  FIG. 1A . As is well known by those skilled in the art, when an operator depresses trigger  5 B, paint draining from container  5 C is mixed with pressurized air and ejected through spray nozzle  5 D in what is preferably an even, uniform spray pattern suitable for high quality spray painting. This is accomplished when a skilled painter holds handle  5 A and depresses trigger  5 B while moving spray paint gun  5  in relation to a workpiece surface in a manner that is well known by those skilled in the art of spray painting. 
     As can be seen in  FIG. 1 , spray nozzle  5 D further includes an externally threaded portion  5 D 1  and a removable internally threaded nozzle portion  5 D 2 . Nozzle portion  5 D 2  includes internal threads that match corresponding external threads of threaded portion  5 D 1 . Typically, the paint gun body presents a smooth cylindrical portion  5 E (shown in  FIG. 1A ) that extends back from externally threaded portion  5 D 1 . 
     Light assembly  10  includes a light bracket  12 , a first light module  30 , a second light module  40  and a third light module  50  and a power pack  60 . Light bracket  12  includes a front mounting plate portion  14  which has an opening  14 A having an inside diameter that is at least slightly larger than the outside diameter of threaded portion  5 D 1 . Extending back from the top edge of front mounting plate portion  14  is a scalloped top flange  16  that can be best seen in  FIGS. 2 and 3 . Scalloped top flange  16  has at least one scallop  16 A that is shaped to fit against the paint inlet fitting  7  at the upper end of spray gun  5 . Accordingly, when light bracket  12  is placed on threaded portion  5 D 1  and nozzle portion  5 D 2  is threaded into place, scallop  16 A is generally pushed into contact with a radial flange  7 A extending from the upper end of paint inlet fitting  7  as shown in  FIG. 1A . This mounts light bracket  12  of light assembly  10  to paint spray gun  5  with sufficient stability for ordinary use. As can be seen in  FIG. 1A  an optional spacer gasket  24  may be installed between front mounting plate portion  14  and nozzle portion  5 D 2 . Further, a series of spacer gaskets  24  of varying thickness may be provided to improve the stability of the mounting of light bracket  12  to spray gun  5 . 
     As noted above, light assembly  10  includes a first light module  30 , a second light module  40  and a third light module  50 . First light module  30  is mounted to the left side of light bracket  12  on a left flange  18 A that extends between front mounting plate portion  14  and top flange  16 . Second light module  40  is mounted to the top edge of light bracket  12  near the top edge of front mounting plate portion  14 . Third light module  50  is mounted to the right side of light bracket  12  on a right flange  18 B that also extends between front mounting plate portion  14  and top flange  16 . In this example, each light module,  30 ,  40  and  50  includes a linear pattern of lights which are preferably six LED lights  32 . In this example, second light module  40  is mounted on a pivot to pivot around axis A indicated in  FIG. 1 . The pivotable mounting of second light module  40  allows the operator to adjust the direction of the lights of second module  40 . In this example, the LED lights  32  of first, second and third light modules  30 ,  40  and  50  are preferably standard 5 mm LED lights which generally require 3.3 volts and 25 milli-amps Each LED light  32 , in this example, produces approximately 7000 mcd (milli-candles) which is approximately 12.9 lumens of light. Light modules  30 ,  40  and  50  are arranged so that when lights  32  are turned on, a generally uniform dispersed beam of light shines upon the workpiece surface that generally corresponds to and is at least as extensive as the area being sprayed by paint spray gun  5 .  FIG. 3  provides a view of a second embodiment wherein second light module  40  has been divided into two independently adjustable light modules  40 A and  40 B. Other LED lights may be selected, at significantly greater costs that generate substantially more light. 
       FIGS. 4 and 4A  provide a close up and cut away view of a typical light module. The skilled reader should note that light modules  30 ,  40  and  50  are preferably fashioned from a lightweight molded plastic or from any other suitable lightweight material such as aluminum. LED lights  32  are also relatively small and light in weight. 
     A power pack  60  is secured to the light bracket  12 , in this example on the right side generally behind third light module  50 . In this example, power pack  60  is arranged to carry preferably four (4) standard AAA batteries (not shown) which are sufficient to supply power to light modules  30 ,  40  and  50  for an extended period of time generally in excess of two hours. It is important for the battery pack  60  to provide sufficient power to power spray paint gun light assembly  10  for a useful period of time. It is also important that battery pack be relatively small and light in weight for the same reasons noted above for light modules  30 ,  40  and  50 . A switch (not shown) is in a circuit with the lights  32  of light modules  30 ,  40  and  50  so that it is possible to turn lights  32  on and off. 
     All of the structural portions of light bracket  12 , light modules  30 ,  40  and  50  and power pack  60  may be fashioned from light weight thin walled injection molded or formed plastic or a similar light weight material. Sill further, the batteries of battery pack  60  may also be relatively light weight rechargeable batteries. Accordingly paint gun light assembly  10  may be fashioned so that it adds very little weight to paint gun  5  while providing useful illumination of the workpiece being painted. It is important that paint gun light assembly  10  not add significant weight to paint gun  5  so that a painter may retain substantially the same degree of maneuverability when using paint gun  5 . 
       FIG. 5  is a partially exploded view illustrates spray gun light assembly  110  which is a second embodiment of the present invention. As can be seen in  FIG. 5 , the body of gravity fed spray gun  105  a light fitting  111  which has two generally upright side portions  112 A and  112 B. In  FIG. 5 , side portion  112 A is exploded for illustrative purposes. In this example each side portion  112 A or  112 B supports six LED lights  114 . A transparent light lens  116  protects each pattern of LED lights  114 . Preferably, the lights in this example are oriented vertically (or parallel to the longitudinal axis of paint gun  5 A) because, generally, the spray pattern is generally vertical. Light fitting  111  may be cast into the body of paint gun  105 A or may be an injected molded plastic assembly that shaped to mount to a correspondingly shaped paint gun body. In either case, an open volume in the handle of paint gun body may be used to provide a battery compartment for receiving and holding batteries  160  for powering lights  114 . A switch may be integrated such that when trigger  105 B is depressed, lights  114  are activated. Preferably, the integrated switch should be arranged such that the light is activated when trigger  105 B is only slightly depressed and such that paint is supplied when trigger  105 B is depressed to a greater degree. Thus, the painter may illuminate an area prior to applying paint. 
       FIGS. 6-10  illustrate a third embodiment spray gun light assembly  210 . As can be seen in  FIG. 5 , light assembly  210  includes a body  212  and a battery pack  260  which in this example is fixed to body  212 . Body  212  includes a central opening  214  adapted for receiving the nozzle of a paint gun. Body  212  also includes two opposite light modules  216 . Preferably, light modules  216  are symmetrically spaced on either side of the paint nozzle in order to not effect the center of gravity of the paint nozzle as much as possible. Also preferably, light modules  216  are positioned behind the spray nozzle so that light is emanating from behind the point were spraying paint originates. In this example, each light module carries one very intense LED light source  217 . Preferably, each light source  217  has a light output of about 200 lumens. In this example, two CREE XM-L white LEDs are selected which each have an output of about 200 lumens or a combined output of about 400 lumens. Two such LED lights as used here would have a light output generally comparable to one 40 W incandescent light bulb. The upper part of body  212  presents a paint inlet fitting bracket  218 . Paint inlet fitting bracket  218  includes a downwardly and rearwardly sloped flange  224  which presents a notch  226  for bracing body  212  by receiving the paint inlet fitting  7  of a spray gun  5  (or sometimes referred to by those skilled in the art as the lower portion of the paint cup attachment) as described above. 
     Third embodiment light assembly  210  is designed to mount to different types of paint spray guns having different sized nozzles and differently located and sized paint inlet fittings. This is accomplished by providing two changeable parts which have common interfaces to light assembly  210  but varying interfaces for a particular spray paint gun. The first changeable part is for accommodating various sizes and shapes of paint gun nozzles. Thus, as can be best seen in  FIG. 7 , central opening  214  of body  212  is fashioned to accept a changeable washer like nozzle fitting  214 A. Nozzle fitting  214 A is adapted to be received by and to fit opening  214  of body  212 . Nozzle fitting  214 A has an inside opening  214 A 1  which is adapted to fit a particular style and size of paint gun nozzle. Thus it is possible to produce one light assembly body  212 , while using a plurality of nozzle fittings  214 A to accommodate a wide variety of paint gun nozzles. 
     The second changeable part of light assembly  210  is for accommodating various sizes and shapes of paint guns with respect to the location and placement of the neck portion  5 E of a paint container  5 C as described above or the paint inlet fitting  7  of a spray gun  5  as described above. Thus, as can be best seen in  FIG. 10 , which gives a top view light assembly  210 , paint inlet fitting bracket  218  includes a removable notch plate  218 A which presents a rearward opening notch  218 A 1 . Notch  218 A 1  is shaped and sized to brace against the inlet fitting  7  of a paint gun  5 . As can be seen in  FIG. 10 , removable notch plate  218 A has a common interface with the base of inlet fitting bracket  218  and presents notch  218 A 1  which can be varied. Thus, by producing a number of different notch plates  218 A, it is possible to accommodate a wide variety of spray paint guns. Accordingly, with the combination of changeable nozzle fittings  214  described above and changeable notch plates  218 A described immediately above, it is possible to fashion a versatile paint gun light assembly that can fit a wide range of spray paint guns while using only two changeable parts. The above described parts for light assembly  210  are preferably and most economically fashioned from injection molded or 3-D printed plastic but can be fashioned from any other suitable, lightweight sufficiently strong and rigid material. 
     Accordingly, from the above description, the skilled reader may appreciate how spray paint gun light assemblies  10 ,  110  and spray paint gun assembly  210 , by using compact, light weight LED lights, a compact design that is compactly arranged around the spray nozzle of the spray gun, provides a useful device for illuminating a surface being painted. 
       FIGS. 11-16B  illustrate a fourth embodiment spray gun light assembly  310 . As can be seen in  FIG. 5 , light assembly  310  is very much like third embodiment spray gun light assembly  210  described above. Light assembly  310  includes a light assembly body  312  and a battery pack  360  which in this example is fixed to body  312 . As can be seen in  FIG. 12 , battery pack  360  includes an end plate  378  which, in this example, is fixed to a light module back plate  318 A of light assembly body  312 . End plate  378  and light module back plate  318 A may be consolidated as one part so that end plate  378  and end back plate  318  comprise one injected molded plastic part. Body  312  includes a central opening  314  adapted for receiving a nozzle  5 D of a paint gun. Body  312  also includes two opposite light modules  316 A and  316 B which are preferably evenly and symmetrically spaced from the center of opening  314 . Light modules  316 A and  316 B present lights  316 L 1  and  316 L 2  respectively which, like light modules  316 A and  316 B, are also preferably evenly and symmetrically spaced from the center of opening  314 . Light modules  316 A and  316 B are symmetrically spaced on either side of opening  314  and paint nozzle  5  in order to minimize the effect of light assembly  310  on the center of gravity and balance of paint gun  5  and to project guide shadows as will be described below. 
     As can be seen in  FIG. 15 , in this example, light modules  316  are also positioned behind spray nozzle  5 D so that light is emanating from the light sources  316 L 1  and  316 L 2  of light modules  316 A and  316 B from behind the point were spraying paint originates and so that the light emanating from lights  316 L 1  and  316 L 2  causes prong shadows  5 S 1  and  5 S 2  respectively to be cast by spray nozzle prongs  5 D 1  and  5 D 2  respectively. The nature and use of prong shadows  5 S 1  and  5 S 2  will be described in greater detail below. The structural components of light assembly body  312 , in this example, are fashioned from injected molded plastic or possibly even 3-D printed plastic or some other convenient, equivalent material. 
     Light sources  316 L 1  and  316 L 2  are preferably small, concentrated, intense light sources. Light sources  316 L 1  and  316 L 2  are preferably not large and diffuse in nature. Preferably, each light source  316 L 1  and  316 L 2  has a light output of about 200 lumens. In this example, two CREE XM-L white LEDs are selected which each have an output of about 200 lumens or a combined output of about 400 lumens. Such an LED light is relatively small and behaves much like a point light source, which is preferred for this device. As can be seen in  FIG. 15 , in this example, light sources  316 L 1  and  316 L 2  are positioned at the center of relatively shallow conical depressions which are defined in light modules  316 A and  316 B respectively. With this arrangement, light sources  316 L 1  and  316 L 2  cast a wide field of illumination as indicated by illumination limit lines F 1  and F 2 . The applicant believes it is preferable to cast light in a wide field so that the painter may have a relatively large area of work surface WS illuminated. Two such LED lights as used in this example which have a combined light output of about 400 lumens would generally be comparable in intensity to one 40 W incandescent light bulb. The color of light emanating from such LED lights would be consistent with a light source at 4600 degrees Kelvin, a color which is generally comparable to light cast on a surface in bright sunlight at mid-day during the summer months in the northern (or southern) latitudes. 
     An important aspect of third embodiment spray gun light  210  and fourth embodiment spray gun light  310  is the projection of spray nozzle prong shadows to indicate the center of the spray pattern. Typically, a paint spray gun  5  will be operated to deposit an elongated zone of paint P 1  as shown in  FIG. 13 . Accepted practice is to deposit a first zone of paint P 1  and then to deposit a second overlapping zone of paint P 2  as shown in  FIG. 13 . This is accomplished by moving the spray gun at a generally constant rate and at a generally constant distance from that work surface W while holding the spray gun in generally constant normal orientation with respect to the work surface W. The proper overlap is accomplished when laying down second zone P 2  by maintaining the center of the spray pattern at the edge of the previous zone P 1 . The desired result is shown in  FIG. 14  that is a cross section taken plane A-A of  FIG. 13 . As can be seen in  FIG. 14 , both first and second zones P 1  and P 2  taper toward the upper and lower edges. However, where zones P 1  and P 2  overlap on work surface W, they have a generally uniform thickness PT. It is this generally uniform thickness that is the desired result for the skilled painter. 
     The use of spray gun prong shadows  5 S 1  and  5 S 2  to guide the deposition of a paint zone is illustrated in  FIG. 15 . Recall that spray gun prongs  5 D 1  and  5 D 2  protrude from the spray gun nozzle as  5 D shown in  FIG. 15  and also as shown  FIGS. 1, 5 and 6  for typical spray paint gun nozzles. Also recall that light sources  316 L 1  and  316 L 2  are located on either side in a symmetrical fashion and behind spray gun nozzle  5 D as shown in  FIG. 15 . The skilled reader should note the angle formed by a line passing through the center of one of light sources  316 L 1  or  316 L 2  and the nearest prong  5 D 1  or  5 D 2 , in this example, forms approximately a 45 degree angle with the plane of light assembly  312 . In  FIG. 15 , a workpiece WP is shown in cross section. Workpiece WP has an upper surface WS that is being painted by spray gun  5 . Although paint is being sprayed from paint gun  5  it is not shown in  FIG. 15  for clarity and ease of illustration. A typical spray pattern may be seen in  FIG. 13 . Line L 1  indicates a line between light source  316 L 1  and the tip of prong  5 D 1 . Line L 1  terminates on workpiece W at point SP 1 . Line L 2  indicates a line between light source  316 L 2  and the tip of prong  5 D 2 . Line L 2  terminates on workpiece W at point SP 2 . Although spray nozzle prongs  5 D 1  and  5 D 2  are used in this example to provide prongs for casting guide shadows, the skilled reader should appreciate that if prongs  5 D 1  and  5 D 2  are not present or if they are oriented differently, shadow casting elements could be easily added to light assembly  310  at locations very proximate to light sources  316 L 1  and  316 L 2  which are adapted to cast guide shadows that may be used by a painter in the manner described in detail below. (The distance shown in  FIG. 15  between light assembly body  312  and work surface WS is not to scale for ease of illustration. Normally this distance might be about twice the width of light assembly body  312  and points SP 1  and SP 2  might be more widely spaced on work surface WS.) 
       FIG. 15A  is a plan view of workpiece WP showing work surface WS. As can be seen in  FIG. 15A , a first spray paint zone P 1  having a lower edge E 1  is deposited on work surface WS. In  FIG. 15A , a second pattern P 2  is being deposited on surface WS. The skilled reader should note the forward edge FE of the second spray pattern. Further, second spray pattern P 2  has an upper edge E 2 A and a lower edge E 2 B. It can be seen in  FIG. 15A  that two prong shadows  5 S 1  and  5 S 2  can be seen on surface WS. Prong shadows  5 S 1  and  5 S 2  may be thought of as spray pattern position indicator shadows. They indicate the centerline of the spray pattern as long as the operator tends to move the spray gun in a direction that is aligned with points SP 1  and SP 1 , or prongs  5 D 1  and  5 D 2 , or light sources  316 L 1  and  316 L 2 . Shadows  5 S 1  and  5 S 2  are positioned according to the locations of points SP 1  and SP 2 . Points SP 1  and SP 2  and lines L 1  and L 2  are merely geometric projections which are being used for illustrative purposes and would not be visible to the user of a spray gun having light assembly  316 . Shadows  5 S 1  and  5 S 2  however would be visible to the painter.  FIG. 15A  shows shadows  5 S 1  and  5 S 2  are preferably aligned with edge E 1  of first paint zone P 1  as the spray paint gun is moved relative to surface WS as described above. When paint gun  5  is operated to cause shadows  5 S 1  and  5 S 2  to track along edge E 1  of a proceeding zone of paint, then the overlap of paint zones P 1  and P 2  will be approximately correct, and, by extension, the thickness of the deposited paint will be approximately uniform if other aspects of good painting technique have been followed. Thus light assembly  316  is arranged to project spray pattern position indicator shadows  5 S 1  and  5 S 2  which can be used by a skilled painter to follow the edge of a previous pass to more reliably deposit uniform layers of paint on a work surface. 
     Another aspect of fourth embodiment light assembly  310  is the battery compartment  360  shown in  FIGS. 16A and 16B . An important aspect of battery module  360  is to provide a battery compartment and switching mechanism that cannot be effected by spray paint. Typically, spray paint would tend to accumulate and foul devices with a conventional switch. As can be seen in  FIG. 16A , battery B, which, in this example, is a typical compact nine volt battery, is enclosed in water tight compartment  362 . Battery module  360  also includes a switch mechanism  370 . Compartment  362  is closed by a sealed cap  364  which, in this example, is sealed by an O ring  366 . As can be seen in  FIGS. 16A and 16B , battery B is capable of sliding between a non-contact position shown in  FIG. 16A  and a contact position shown in  FIG. 16B . When in the non-contact position, battery terminals BT 1  and BT 2  are not in contact with light circuit contacts C 1  and C 2  respectively. A spring  368  biases battery B in the non-contact position. A thumb screw T presents a knob K and a threaded portion TS which extends through a correspondingly threaded opening which is located oppositely from the terminals BT 1  and BT 2  and spring  368 . When thumb screw T is turned to cause threaded portion TS to extend through cap  364 , battery B is urged against spring  368  and urged into the contact position shown in  FIG. 16B . Thus, battery module  360  provides a sealed switch that is highly resistant to the infiltration of paint or solvents. The structural parts of battery module  360  comprising the closed compartment are most easily fashioned from injection molded plastic or 3-D printed plastic. Other components such as the spring, the switch mechanism or any electrical converters and the like needed to transfer power from a standard compact battery such as the standard 9V battery shown (or other selected readily available batteries) to selected light sources  316 L 1  and  316 L 2  are be well known to those skilled in the art. 
       FIGS. 17 and 17A  illustrate a fifth embodiment 410 of the paint gun light. Fifth embodiment light assembly includes a light assembly body  412 . In this example, light assembly body  412  may be identical to light assembly body  312 , except, fifth embodiment light assembly body  412  presents two oppositely spaced, symmetrical shadow prongs  420 A and  420 B. Shadow prongs  420 A and  420 B are located inboard of light sources  416 L 1  and  416 L 2  and project toward the work surface WS as shown in FIG.  17 . (The distance shown in  FIG. 17  between light assembly body  412  and work surface WS is not to scale for ease of illustration. Normally this distance might be about twice the width of light assembly body  412 .)  FIG. 17A  provides a side view of shadow prongs  420 A and  420 B. In this example, shadow prongs  420 A and  420 B are shaped to cast shadows on work surface WS that might be somewhat similar to those shown in  FIG. 15A . It is important that the shadows cast by shadow prongs  420 A and  420 B be sufficiently clear and defined to allow a painter to understand the location of the centerline of the zone wherein paint is being deposited on work surface WS. Shadow prongs  420  are useful if it is desirable to mount light assembly  410  at a location that is forward of that shown in  FIG. 15  or if a spray nozzle is in use that does not present prongs  5 D 1  and  5 D 2  shown in  FIG. 15 . 
     As can be understood from the above description, light assemblies  210 ,  310  and  410  provide a compact intense paint spray gun light which illuminate large areas of a work surface. Light assemblies  210 ,  310  and  410  also provide a way for a painter to track the location of the center of a spray paint zone. This makes it easier for the painter to align the center of a spray pass with the edge of a previous pass. By so doing, the painter is not only able to see his or her work more clearly because of the wide and relatively intense field of illumination but he or she is able to deposit more uniform layer of paint as the work progresses. This leads the optimized, uniform deposition of paint. 
     It is to be understood that while certain forms of this invention have been illustrated and described, it is not limited thereto, except in so far as such limitations are included in the following claims and allowable equivalents thereof.