specific embodiments of the invention will now be described with reference to the accompanying drawings . this invention may , however , be embodied in many different forms and should not be construed as limited to the embodiments set forth herein ; rather , these embodiments are provided so that this disclosure will be thorough and complete , and will fully convey the scope of the invention to those skilled in the art . the terminology used in the detailed description of the embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention . in the drawings , like numbers refer to like elements . referring now to fig1 a - c , there is shown an embodiment of a device 100 of the invention . device 100 is a light tower that generally includes a base assembly 110 , a lamp assembly 150 , a cap assembly 200 , and a hand rail 250 . the device 100 is configured for use with a computer application for controlling one or more devices . the application is downloadable and useable on a portable device such as a smart phone or tablet . it is to be understood that in use , it is possible to use several devices 100 simultaneously in order to treat an area large enough to merit the use of more than one device 100 . referring now to fig2 , there is shown an embodiment of a base assembly 110 of the invention . beginning at the bottom of the base assembly 110 , the device 100 includes at least three , preferably four or more wheels 112 . the wheels 112 are preferably mounted on swiveling casters such that the device 100 may be moved easily from room to room during a cleaning operation . the wheels are mounted on a base housing 114 , which includes a removable panel 116 , shown in fig1 but removed in fig2 to show the parts contained therein . in an alternate embodiment , wheels 112 are powered and directed by a drive unit ( not shown ) such as a motor . the motor is either controlled remotely by an operator or locally by an onboard navigation system . it is contemplated that the scanning system ( discussed below ) provides navigational input to the navigation system , allowing the device 100 to move around the room during the disinfection process in a computed manner calculated to eliminate shadow areas . an aperture in the removable panel 116 is provided to expose an antenna 118 , useable to communicate with a device , such as a smartphone , utilizing the control application . the antenna 118 may be configured to support any wireless communication technology such as ir , radio waves , wlan , wi - fi , or bluetooth ®. wireless is preferred to tethered as the device 100 is preferably operated in a room without human presence , as uv radiation can be harmful to humans . the antenna 118 is in data - flow communication with a control circuit 119 . just above the antenna 118 is a portal 120 for a retractable cord 122 ( see fig1 ). the cord 122 may be collected on a spring - loaded , ratcheting spool below the portal 120 . also below the portal , centered in the bottom of the base assembly , is a fan 124 . fan 124 works in conjunction with a fan in the cap assembly 200 ( discussed below ), to create a steady stream of cooling air through the lamp assembly 150 . fig3 shows the base assembly 110 with some of the components removed so that the electronic control circuit board 130 and the lamp ballasts 132 are shown . the control circuit board 130 runs an algorithm that allows multiple devices 100 to detect each other and their respective locations in a room , as well as other objects , and the control circuit board 130 then uses this information to compute exposure times that are inversely proportional to these distances . the control circuit board 130 also controls motor 154 ( discussed below ) to adjust the speed of rotation of the lamp assembly 150 to achieve desired energy densities on room surfaces . this differential rotation of the lamp assembly 150 allows devices 100 to normalize exposure on room surfaces , thereby ensuring that all surfaces achieve approximately equal exposure . this results in minimum total exposure times to treat a room or an area of a room . the algorithms run by the circuit board 130 further factor the locations of other devices 100 and the energy those devices 100 are contributing to the energy falling into any given area in the room . the exposure times are then adjusted for each device 100 to account for the additive exposure from multiple towers to result in a minimized exposure time used to sanitize the room . the base assembly 110 is attached to the lamp assembly 150 with a swivel connector 152 , best shown in fig4 . the swivel connector 152 allows the lamp assembly 150 to rotate in relation to the base assembly 110 . a motor 154 is mounted on the base assembly 110 and attached via a drive mechanism 156 to the lamp assembly 150 , such that the motor 154 , when activated , causes rotation of the lamp assembly 150 relative to the base assembly 110 . the drive mechanism 156 is shown as a belt - drive in fig4 , but one skilled in the art would recognize that motors can be configured to drive objects using gears , belts , chains , worm - drives , or other mechanisms , all considered to be included as embodiments of the invention . the lamp assembly 150 also includes at least one lamp 160 , as seen in fig5 . the number of lamps 160 may be determined by the intended application and desired bulbs available . the embodiment shown in fig5 shows three lamps 160 . in one or more embodiments of the invention , the lamps emit uv - c light . though the lamps 160 shown utilize existing fluorescent uv - c technology , one skilled in the art will realize that advancements in uv - c lamps could result in a variety of lamps being used with the invention . behind the lamps 160 is a reflector 162 . the reflector 162 wraps around the lamps 160 in order to focus and concentrate the light emitted from the lamps 160 in a desired direction . the reflector 162 may be parabolic , catenary , semi - circular , circular , or other curves , depending on the desired reflective result and / or the placement of the lamps . for example , a parabolic reflector , with the lamps located approximately close to the parabolic focal point , would result in a relatively narrow , focused ( collimated ) beam . such a beam increases the intensity of uv radiation in a desired direction . if desired , it is possible to incorporate a flatter reflector , such as a semi - sphere or catenary reflector . in this regard , a flexible reflector 162 may be provided that is connected to the device 100 in a manner that allows the curve of the reflector to be adjusted based on the desired application . alternatively , beam adjustment or focusing could be accomplished by adjusting the lamp position relative to the reflector to create a “ zoom ” function that would allow the beam to be either more or less tightly focused . at the bottom of the lamp assembly 150 , a lower planar reflector 164 ( fig2 ) is optionally provided . the planar reflector 164 may be angled downwardly , as shown , to scavenge the uv energy that would otherwise be directed onto the floor , where disinfection is typically less critical , and direct it upward into higher areas of the room . similarly , at the top of the lamp assembly 150 , is an upper planar reflector 166 ( fig5 ). the upper planar reflector 166 , like the lower planar reflector 150 , is angled to scavenge the uv energy that would otherwise be directed at the ceiling onto areas where human contact is more likely . the upper planar reflector 166 also includes an aperture 170 . referring now to fig6 , there is shown the cap assembly 200 of the invention . the cap assembly is oriented on top of the lamp assembly 150 and includes a sensor mechanism 210 and a cooling mechanism 220 . the sensor mechanism 210 includes a sensor 212 and a sensor drive mechanism 214 . the sensor 212 may be any suitable sensor mechanism . non - limiting examples include laser sensors , and ir ( infra - red ) sensors . the sensor 212 is used to scan the room to analyze distances to various surfaces and provide input as to the location of objects in the room . the data provided by the sensor 212 may be used to calculate potential shadow areas as well as necessary treatment times and powers . the sensor 212 may also include a motion detection capability , which detects movement prior to the activation of the devices 100 and aborts the treatment initiation in the event that motion is detected just before the treatment . sensor 212 is shown in fig6 as a single sensor . however , the sensor 212 may incorporate multiple sensing modalities . the embodiment shown in fig6 also includes a sensor drive mechanism 214 . the sensor drive mechanism 214 attaches the sensor 212 to the cap assembly 200 and moves the sensor 212 up and down through the aperture 170 of the upper planar reflector 166 . the cap assembly 200 also includes a cooling mechanism 220 in the form of a fan . the cooling mechanism 220 , when energized , creates airflow around the lamps 160 to draw heat away from them . fig7 shows three devices 100 connected together with linking connectors 300 . linking connectors 300 include a base 302 and a handle 304 . the bases 302 are shaped to be placed over two adjacent casters 112 , on either side of the devices 100 , totaling four casters , to lock two devices 100 together . the handle 304 provides a place to grab and lift the connector 300 and set it down over the casters 112 . using the linking connectors 300 , a chain of devices 100 can be formed , allowing a single person to move multiple devices 100 easily . although the invention has been described in terms of particular embodiments and applications , one of ordinary skill in the art , in light of this teaching , can generate additional embodiments and modifications without departing from the spirit of or exceeding the scope of the claimed invention . for example , the device 100 described above includes a lamp assembly 150 that rotates relative to the base assembly 110 . however , one skilled in the art would realize that the lamps 160 could be fixed relative to the base assembly 110 and the reflector 162 could be configured to rotate around the lamps 160 . accordingly , it is to be understood that the drawings and descriptions herein are proffered by way of example to facilitate comprehension of the invention and should not be construed to limit the scope thereof .
a system and method for disinfecting hard surfaces in an area such as a hospital room including a light source emitting uv light and a reflector mounted behind the light source for concentrating and directing the light toward a target . the light source and reflector rotate to direct the concentrated beam around a room , thereby making more efficient use of the energy being emitted .