text: the following detailed description of the invention references the accompanying drawings that illustrate specific embodiments in which the invention can be practiced . the embodiments are intended to describe aspects of the invention in sufficient detail to enable those skilled in the art to practice the invention . other embodiments can be utilized and changes can be made without departing from the scope of the present invention . the following detailed description is , therefore , not to be taken in a limiting sense . the scope of the present invention is defined only by the appended claims , along with the full scope of equivalents to which such claims are entitled . in this description , references to “ one embodiment ”, “ an embodiment ”, or “ embodiments ” mean that the feature or features being referred to are included in at least one embodiment of the invention . separate references to “ one embodiment ”, “ an embodiment ”, or “ embodiments ” in this description do not necessarily refer to the same embodiment and are also not mutually exclusive unless so stated and / or except as will be readily apparent to those skilled in the art from the description . for example , a feature , structure , act , etc . described in one embodiment may also be included in other embodiments , but is not necessarily included . thus , the present invention can include a variety of combinations and / or integrations of the embodiments described herein . fig1 depicts an emergency vehicle 10 having a cab 12 that presents a roof 14 having a sloped portion 16 . the cab includes a windshield 18 and the sloped portion 16 of the roof 14 is positioned immediately above and extends generally upwardly and rearwardly from the windshield 18 . an emergency light system 20 is coupled to the roof 14 of the emergency vehicle 10 and covers at least a portion of the sloped portion 16 . the emergency vehicle 10 shown in fig1 is an ambulance having a patient compartment 22 located immediately behind the cab 12 . although the present invention is shown in the drawings as being implemented in an ambulance , it should be understood that various other types of emergency vehicles ( e . g ., fire trucks and tow trucks ) can employ the invention . generally , any emergency vehicle having a sloped roof portion on the cab is suitable for use in conjunction with the present invention . these emergency vehicles typically carry some type of emergency equipment behind the cab of the vehicle . in the case of an ambulance , the emergency equipment carried by the vehicle includes medical equipment , whereas in the case of a fire truck , the emergency equipment carried by the vehicle may include firefighting equipment and / or medical equipment . as shown in fig2 - 6 , the emergency light system 20 includes a base 24 coupled to the roof 14 and a lens assembly 26 coupled to and supported by the base 24 . as perhaps best illustrated in fig3 , the emergency light system 20 can be mounted on a portion of the roof 14 having a sloped portion 16 . the sloped portion 16 of the roof 14 can slope a vertical distance of at least 6 , 8 , or 10 inches and / or not more than 18 , 16 , 14 , or 12 inches over a horizontal distance of 12 inches . additionally , or alternatively , the sloped portion 16 of the roof 14 can slope a vertical distance of at least 8 , 10 , or 12 inches and / or not more than 20 , 18 , 16 , or 14 inches over a horizontal distance of 18 inches . in certain embodiments , the sloped portion 16 extends across substantially the entire width of the roof 14 of the cab 12 . for example , the sloped portion 16 of the roof 14 can have a width of at least 2 , 4 , or 5 feet . as illustrated in fig3 - 6 , the lens assembly 26 can be formed of one or more lenses 28 that are rigidly coupled to a lens support structure 30 . in certain embodiments , at least two of the lenses 28 are colored differently from one another . for example , one or more of the lenses 28 can be red , while one or more of the lenses 28 can be substantially clear . in the embodiment depicted in the drawings , the emergency light system 20 includes three individual lenses 28 , with the outside two lenses being red and the central lens being clear . when multiple lenses are used , a lens ceiling gasket 33 ( fig6 ) can be used between the individual lenses 28 to prevent moisture or debris from entering between the lenses 28 . as perhaps best shown in fig3 - 5 , the emergency light system 20 can also include a hinge 32 ( shown in fig4 and 5 ) that couples the lens assembly 26 to the base 24 and allows the lens assembly 26 to be shifted relative to the base 24 between a closed position ( shown in fig3 ) and an open position ( show in fig4 and 5 ). in certain embodiments , the hinge 32 is a locking hinge that is capable of supporting the lens assembly 26 in the open position without additional external support . as illustrated in fig4 and 5 , the base 24 presents a lens supporting surface 34 and the lens assembly 26 presents an attachment surface 36 . the shape of the attachment surface 36 substantially conforms to the shape of the lens supporting surface 34 so that when the lens assembly 26 is in the closed position , the lens supporting surface 34 and attachment surface 36 contact one another with minimal or no gaps therebetween . as shown in fig6 , a sealing gasket 38 can be attached to one of the lens supporting and attachment surfaces 34 , 36 so that when the lens assembly 26 is in the closed position , the gasket 38 is disposed between the lens supporting surface 34 and attachment surface 36 . this gasket 38 can extend entirely around the interior of the emergency light system 20 to prevent moisture and debris from entering the inside of the emergency light system 20 . the gasket 38 can be made of any relatively flexible material known in the art as being suitable for use as a seal between two rigid surfaces . the emergency light system 20 can also include one or more locking mechanisms 40 ( fig3 ) for coupling the lens assembly 26 to the base 24 in the closed position . the locking mechanisms 40 can be any suitable releasable fastener capable of coupling the front and / or sides of the lens assembly 26 to the front and / or sides of the base 24 . in one embodiment , the locking mechanisms 40 are simply one or more screws . in another embodiment , the locking mechanisms 40 can include one or more quick - release fasteners , such as draw latches , that permit rapid coupling and decoupling of the lens assembly 26 and the base 24 . the hinge 32 and locking mechanisms 40 permit ready access to the interior of the emergency light system 20 so that the individual lights contained therein can be readily reconfigured , repaired , or replaced . when the lens assembly 26 is in the open position , as shown in fig4 and 5 , external access is permitted to a light supporting region 42 of the base 24 . the light supporting region 42 includes a plurality of light supporting surfaces 44 to which individual emergency lights 46 can be coupled . in certain embodiments , the light supporting region 42 includes at least 4 , 6 , 8 , 10 , or 12 of the light supporting surfaces 44 . these light supporting surfaces 44 can be substantially flat and / or substantially vertical . further , at least a portion of the light supporting surfaces 44 can be at different elevations and / or can face in different directions . in the embodiment depicted in fig4 - 6 , the light supporting surfaces 44 include an upper group of light supporting surfaces and a lower group of light supporting surfaces , where the upper group of light supporting surfaces are located at a higher elevation than the lower group of light supporting surfaces and are also horizontally offset rearwardly relative to the lower group of light supporting surfaces . this variety in position and direction of the light supporting surfaces 44 permits the same base 24 to be used for a variety of different light configurations . fig7 and 8 show various reference lines , references points , and dimensions used to define the unique shape of the emergency light system 20 . as mentioned previously , in certain embodiments , the emergency light system 20 covers a large area of the roof of the emergency vehicle . for example , the base 24 can be sized to cover at least 2 , 4 , 6 , 8 , or 10 square feet of the emergency vehicle roof . further , the lenses 28 of the lens assembly 26 can be relatively large so that many individual emergency lights can shine therethrough . thus , the lenses 28 can present a total outer surface area of at least 2 , 4 , or 5 square feet through which light from the individual emergency lights can shine . in certain embodiments the emergency light system 20 can have a relatively low profile . as depicted in fig8 , this low profile configuration can be at least partly quantified by the ratio of the maximum depth ( dmax ) of the emergency light system 20 to the maximum height ( hmax ) of the emergency light system 20 . referring to fig8 , dmax is defined herein as the maximum dimension from the front edge of the emergency light system 20 to the rear edge of the emergency light system 20 , measured in the direction of travel in the emergency vehicle . in certain embodiments , dmax can be at least 12 , 18 , or 24 inches and / or not more than 48 , 42 , or 36 inches . as shown in fig8 , dmax is measured between a reference point “ a ” and a reference point “ b .” reference point “ a ” is the point on the front edge of the base 24 located at the maximum depth of the emergency light system 20 , while reference point “ b ” is the point on the rear edge of the base 24 located at the maximum depth of the emergency light system 20 . a reference line ab is defined between reference point “ a ” and reference point “ b .” referring again to fig8 , hmax is defined herein as the maximum dimension from the top of the emergency light system 20 to reference line ab , measured perpendicular to reference line ab in a vertical reference plane that includes reference line ab . in certain embodiments , hmax can be at least 4 , 6 , or 8 inches and / or not more than 24 , 16 , or 12 inches . as shown in fig8 , hmax is measured from reference line ab to a reference point “ c .” reference point “ c ” is the point on the exterior peak of the lens assembly 26 that is farthest from reference line ab , measured perpendicular to reference line ab in the vertical plane that includes reference line ab . the ratio of dmax to hmax can be at least 1 . 25 : 1 , 1 . 5 : 1 , 1 . 75 : 1 , 2 : 1 , 2 . 25 : 1 , 2 . 5 : 1 , 2 . 75 : 1 , or 3 : 1 . further , the ratio of dmax to hmax can be not more than 20 : 1 , 15 : 1 , 10 : 1 , 8 : 1 , or 6 : 1 . in the embodiment depicted in fig8 , reference point “ a ” represents a central front edge point of the emergency light system 20 , reference point “ b ” represents a central rear edge point of the emergency light system 20 , and reference point “ c ” represents a central peak point of the emergency light system 20 . as shown in fig8 , a reference line ac extends between reference points “ a ” and “ c ” and a reference line bc extends between reference points “ b ” and “ c .” due to the low profile nature of the emergency light system 20 depicted in the drawings , an obtuse interior angle “ θ ” is defined between reference lines ac and bc . this obtuse interior angle “ θ ” can be at least 100 , 110 , or 120 degrees and / or not more than 170 , 160 , or 150 degrees . further , a first acute interior angle “ a ” is defined between reference lines ab and ac , where “ a ” can be at least 10 , 15 , or 20 degrees and / or not more than 80 , 60 , or 50 degrees . in addition , a second acute interior angle “ β ” is defined between reference lines ab and bc , where “ β ” can be at least 10 , 15 , or 20 degrees and / or not more than 80 , 60 , or 50 degrees . the rounded and low profile nature of the emergency light system 20 can also be at least partially defined by the external radius of curvature “ rp ” at reference point “ c ” ( the central peak point ). in certain embodiments , “ rp ” can be at least 2 , 4 , 6 , 8 , or 10 inches . as shown in fig7 , the emergency light system 20 can have a maximum width ( wmax ) that is measured from the outer point “ s1 ” on one side of the emergency light system 20 to the outer point “ s2 ” on the opposite side of the emergency light system 20 . wmax is measured perpendicular to the direction of travel of the emergency vehicle to which the emergency light system 20 is mounted . in certain embodiments , the ratio of wmax to dmax is at least 1 : 1 , 1 . 25 : 1 , 1 . 5 : 1 , or 2 : 1 and / or not more than 4 : 1 , 3 : 1 , or 2 . 5 : 1 . although the invention has been described with reference to the preferred embodiment illustrated in the attached drawing figures , it is noted that equivalents may be employed and substitutions made herein without departing from the scope of the invention . having thus described various embodiments of the invention , what is claimed as new and desired to be protected by letters patent includes the following :