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A light mountable on a handgun may comprise: a light housing including one or more light sources, a cavity for a source of electrical power, a switch, and a circuit for energizing the light sources. The light housing has complementary parts configured to enclose a part of the handgun and a mounting

A light mountable on a handgun may comprise: a light housing including one or more light sources, a cavity for a source of electrical power, a switch, and a circuit for energizing the light sources. The light housing has complementary parts configured to enclose a part of the handgun and a mounting rail, and may include an access cover that is openable when the light is mounted on a handgun, for placing and removing the source of electrical power. Light sources may include an illumination source and/or an aiming source.

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1. A light mountable on a handgun comprising: a light module including a light module housing supporting one or more light sources, at least one electrical switch, and a control circuit for selectively energizing said one or more light sources, wherein said light module defines a first cavity for re

1. A light mountable on a handgun comprising: a light module including a light module housing supporting one or more light sources, at least one electrical switch, and a control circuit for selectively energizing said one or more light sources, wherein said light module defines a first cavity for receiving a source of electrical power;an outer light housing having first and second complementary housing parts enclosing said light module, the first and second complementary housing parts cooperating when together to define at a first end of the outer light housing a second cavity configured to correspond in size and shape to a first part of the handgun and to define at an upper part of said outer light housing a rail recess configured to correspond in size and shape to a mounting rail of the handgun;whereby said light is mountable to the handgun when the first and second complementary housing parts of the outer light housing are attached together with the part of the handgun in the second cavity thereof and with the mounting rail of the handgun in the rail recess thereof;said outer light housing having one or more openings at a second end thereof through which light produced by said one or more light sources may be emitted;said outer light housing having an opening through which the at least one electrical switch of said light module is actuatable from outside said outer light housing;said outer light housing including an access cover on an exterior surface thereof that is not adjacent the handgun, said access cover being openable when said light is mounted on a handgun for placing a source of electrical power into the light module and for removing the source of electrical power from the light module; anda movable member disposed between said access cover and a side of the source of electrical power, wherein said movable member is not an electrical contact and biases the source of electrical power against an electrical contact of said light module. 2. The light mountable on a handgun of claim 1 wherein the one or more light sources of said light module include: an illumination light source, ora laser aiming light source; oran illumination light source and a laser aiming light source. 3. The light mountable on a handgun of claim 1 wherein the first and second complementary housing parts of said outer light housing are attached together by one or more threaded fasteners, wherein tightening the one or more threaded fasteners clamps the part of the handgun in the first cavity defined by said first and second complementary housing parts and clamps the mounting rail in the rail recess defined by said first and second complementary housing parts. 4. The light mountable on a handgun of claim 1 wherein the part of the handgun for which the cavity of said outer light housing is configured includes a trigger guard. 5. The light mountable on a handgun of claim 1 wherein; said access cover is closable to retain the source of electrical power in said light module; orsaid access cover is pivotably attached to one of the first and second complementary housing parts of said outer light housing; orsaid access cover is closable to retain the source of electrical power in said light module and is pivotably attached to one of the first and second complementary housing parts of said outer light housing. 6. The light mountable on a handgun of claim 1 wherein said movable member biases the source of electrical power against the electrical contact of said light module so that the side of the source of electrical power makes an electrical connection to the electrical contact. 7. The light mountable on a handgun of claim 1 in combination with at least a second outer light housing having first and second complementary housing parts for enclosing said light module, the first and second complementary housing parts of said second outer light housing cooperating when together to define at a first end of the outer light housing a cavity configured to correspond to the size and shape of a part of a different handgun than does the outer light housing of claim 1 and to define at an upper part thereof a rail recess configured to correspond to a mounting rail of the different handgun. 8. The light mountable on a handgun of claim 2 wherein said light module includes an azimuth adjusting screw and an elevation adjusting screw for aiming said laser light source in azimuth and elevation, respectively, said outer light housing having one or more openings through which the azimuth adjusting screw and the elevation adjusting screw can be adjusted. 9. The light mountable on a handgun of claim 1 wherein each of said first and second complementary housing parts has an inwardly directed flange at the upper part thereof, the respective inwardly directed flanges of said first and second complementary housing parts cooperating to define at the upper part of said outer light housing the rail recess configured to correspond in size and shape to the mounting rail of the handgun. 10. A light mountable on a handgun comprising: a light module including in a light module housing: an illumination light source and a laser aiming light source, at least one electrical switch, and a control circuit for selectively energizing said illumination light source and said laser aiming light source, said light module defining a first cavity for receiving a source of electrical power;an outer light housing having first and second complementary housing parts enclosing said light module, the first and second complementary housing parts cooperating when together to define at a first end of the outer light housing a second cavity configured to correspond to the size and shape of a trigger guard of the handgun and to define at an upper part of said outer light housing a rail recess configured to correspond in size and shape to a mounting rail of the handgun;whereby said light is mountable to the handgun when the first and second complementary housing parts of the outer light housing are attached together with the trigger guard of the handgun in the second cavity thereof and with the mounting rail of the handgun in the rail recess thereof;said outer light housing having one or more openings at a second end thereof through which light produced by said illumination light source and said laser aiming light source may be emitted;said outer light housing having an opening through which the at least one electrical switch of said light module is actuatable from outside said outer light housing;said outer light housing including an access cover on an exterior surface thereof that is not adjacent the handgun, said access cover being openable when said light is mounted on a handgun for placing a source of electrical power into the light module and for removing the source of electrical power from the light module; anda movable member disposed between said access cover and a side of the source of electrical power, wherein said movable member is not an electrical contact and biases the source of electrical power against an electrical contact of said light module. 11. The light mountable on a handgun of claim 10 wherein: said access cover is closable to retain the source of electrical power in said light module; orsaid access cover is pivotably attached to one of the first and second complementary housing parts of said outer light housing; orsaid access cover is closable to retain the source of electrical power in said light module and is pivotably attached to one of the first and second complementary housing parts of said outer light housing. 12. The light mountable on a handgun of claim 10 wherein said movable member biases the source of electrical power against the electrical contact of said light module so that the side of the source of electrical power makes an electrical connection to the electrical contact. 13. The light mountable on a handgun of claim 10 wherein the first and second complementary housing parts of said outer light housing are attached together by one or more threaded fasteners, wherein tightening the one or more threaded fasteners clamps the trigger guard of the handgun in the second cavity defined by said first and second complementary housing parts and clamps the mounting rail in the rail recess defined by said first and second complementary housing parts. 14. The light mountable on a handgun of claim 10 in combination with at least a second outer light housing having first and second complementary housing parts for enclosing said light module, the first and second complementary housing parts of said second outer light housing cooperating when together to define at a first end of the outer light housing a cavity configured to correspond to the size and shape of a trigger guard of a different handgun than does the outer light housing of claim 10 and to define at an upper part thereof a rail recess configured to correspond to a mounting rail of the different handgun. 15. The light mountable on a handgun of claim 10 wherein said light module includes an azimuth adjusting screw and an elevation adjusting screw for aiming said laser light source in azimuth and elevation, respectively, said outer light housing having one or more openings through which the azimuth adjusting screw and the elevation adjusting screw can be adjusted. 16. The light mountable on a handgun of claim 10 wherein each of said first and second complementary housing parts has an inwardly directed flange at the upper part thereof, the respective inwardly directed flanges of said first and second complementary housing parts cooperating to define at the upper part of said outer light housing the rail recess configured to correspond in size and shape to the mounting rail of the handgun. 17. A light mountable on a handgun comprising: a light housing having first and second complementary housing parts that cooperate when together to define at a first end of said light housing a first cavity configured to correspond in size and shape to a trigger guard of the handgun and to define at an upper part of said light housing a rail recess configured to correspond in size and shape to a mounting rail of the handgun;said light housing including therein an illumination light source or a laser aiming light source or both, at least one electrical switch, and a control circuit for selectively energizing said illumination light source, said laser aiming light source, or both said illumination and laser aiming light sources, said light housing defining a second cavity for receiving a source of electrical power;whereby said light is mountable to the trigger guard and mounting rail of the handgun when the first and second complementary housing parts of said light housing are attached together with the trigger guard of the handgun in the first cavity thereof and with the mounting rail in the rail recess thereof;said light housing having one or more openings at a second end thereof through which light produced by said illumination light source, by said laser aiming light source, or by both said illumination and said laser aiming light sources may be emitted;said light housing having an opening through which the at least one electrical switch is actuatable from outside said light housing;said light housing including an access cover on an exterior surface thereof that is not adjacent the handgun, said access cover being openable when said light is mounted on a handgun for placing a source of electrical power into the second cavity of said light housing and for removing the source of electrical power from the second cavity of said light housing; anda movable member disposed between said access cover and a side of the source of electrical power, wherein said movable member is not an electrical contact and biases the source of electrical power against an electrical contact of said control circuit. 18. The light mountable on a handgun of claim 17 wherein: said access cover is closable to retain the source of electrical power in said light housing; orsaid access cover is pivotably attached to one of the first and second complementary housing parts of said light housing; orsaid access cover is closable to retain the source of electrical power in said light housing and is pivotably attached to one of the first and second complementary housing parts of said light housing. 19. The light mountable on a handgun of claim 17 wherein said movable member biases the source of electrical power against the electrical contact of said control circuit so that the side of the source of electrical power makes an electrical connection to the electrical contact. 20. The light mountable on a handgun of claim 17 wherein the first and second complementary housing parts of said light housing are attached together by one or more fasteners, wherein tightening the one or more fasteners clamps the trigger guard of the handgun in the first cavity defined by said first and second complementary housing parts and clamps the mounting rail of the handgun in the rail recess defined by said first and second complementary housing parts. 21. The light mountable on a handgun of claim 17 wherein said light housing further includes an azimuth adjusting screw and an elevation adjusting screw for aiming said laser light source in azimuth and elevation, respectively, said light housing having one or more openings through which the azimuth adjusting screw and the elevation adjusting screw can be adjusted. 22. The light mountable on a handgun of claim 17 wherein said light housing includes: a light module including a light module housing supporting the illumination light source and the laser aiming light source, the at least one electrical switch, and the control circuit for selectively energizing said illumination light source and said laser aiming light source, and wherein said light module housing defines the second cavity for receiving a source of electrical power; andwherein said first and second complementary housing parts enclose said light module. 23. The light mountable on a handgun of claim 17 in combination with at least a second light housing having first and second complementary housing parts for enclosing therein the illumination light source or the laser aiming light source or both, the at least one electrical switch, and the control circuit for selectively energizing the illumination light source, the laser aiming light source, or both the illumination and laser aiming light sources, the second light housing defining a second cavity for receiving a source of electrical power, the first and second complementary housing parts of said second light housing cooperating when together to define at a first end of the light housing a cavity configured to correspond to the size and shape of a trigger guard of a different handgun than does the light housing of claim 19 and to define at an upper part thereof a rail recess configured to correspond to a mounting rail of the different handgun. 24. A light mountable on a handgun comprising: a light housing having first and second complementary housing parts that define a first cavity configured to correspond in size and shape to a trigger guard of the handgun and define a rail recess configured to correspond in size and shape to a mounting rail of the handgun;said light housing including an illumination light source or a laser aiming light source or both, at least one electrical switch, and a control circuit for selectively energizing said illumination light source, said laser aiming light source, or both;whereby said light is mountable to the trigger guard and mounting rail of the handgun when the first and second complementary housing parts of said light housing are attached together with the trigger guard of the handgun in the first cavity thereof and with the mounting rail in the rail recess thereof;said light housing having one or more openings through which light produced by said illumination light source, by said laser aiming light source, or by both, may be emitted;said light housing having an opening through which the at least one electrical switch is actuatable from outside said light housing;said light housing including an access cover on an exterior surface thereof configured to be openable when said light is mounted on a handgun for placing and removing a source of electrical power into said light housing; anda movable member disposed between said access cover and a side of the source of electrical power, wherein said movable member is not an electrical contact and biases the source of electrical power against an electrical contact of said control circuit. 25. The light mountable on a handgun of claim 24 wherein the first and second complementary housing parts of said light housing are attached together by one or more fasteners, wherein tightening the one or more fasteners clamps the trigger guard of the handgun in said first and second complementary housing parts and clamps the mounting rail of the handgun in the rail recess of said first and second complementary housing parts. 26. The light mountable on a handgun of claim 24 wherein said light housing includes: a light module including a light module housing supporting the illumination light source and the laser aiming light source, the at least one electrical switch, and the control circuit, and wherein said light module housing defines a cavity for receiving a source of electrical power; andwherein said first and second complementary housing parts enclose said light module. 27. The light mountable on a handgun of claim 24 in combination with at least a second light housing having first and second complementary housing parts for enclosing therein the illumination light source or the laser aiming light source or both, the at least one electrical switch, and the control circuit, the first and second complementary housing parts of said second light housing cooperating when together to define a cavity configured to correspond to the trigger guard of a different handgun than does the light housing of claim 24 and to define a rail recess configured to correspond to a mounting rail of the different handgun.