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A light may comprise a light body having an opening for receiving an electrical power source, and a head including a light source and having an end for engaging the light body. A head for a light may comprise a light source, a reflector, an end for engaging a light body; and an insulating member. At

A light may comprise a light body having an opening for receiving an electrical power source, and a head including a light source and having an end for engaging the light body. A head for a light may comprise a light source, a reflector, an end for engaging a light body; and an insulating member. At least three concentric and/or coaxial electrical contacts of the head are enclosed by the head and light body when the head and light body are engaged. One of the three concentric electrical contacts may provide an electrical connection to the light source and one of the three concentric electrical contacts may be for making an electrical connection to an electrical power source.

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1. A light comprising: a light body having a cavity for receiving a source of electrical power therein, said light body having a threaded opening to the cavity;a head including a light source, said head having a threaded end for engaging the threaded opening of said light body for covering the threa

1. A light comprising: a light body having a cavity for receiving a source of electrical power therein, said light body having a threaded opening to the cavity;a head including a light source, said head having a threaded end for engaging the threaded opening of said light body for covering the threaded opening and the cavity therein;at least three concentric electrical contacts at the threaded end of said head and concentric with the thread thereat, wherein said at least three concentric electrical contacts are enclosed by said head and said light body when said head is threaded to said light body, and wherein at least one of said at least three concentric electrical contacts provides an electrical connection to the light source of said head and wherein at least one of said at least three concentric electrical contacts provides an electrical connection to a source of electrical power when a source of electrical power is disposed in the cavity of said light body,whereby said head may serve as a removable cover for facilitating the placing of a source of electrical power into the cavity of said light body and the removing of a source of electrical power from said light body. 2. The light of claim 1 wherein said light body includes at least two electrical contacts extending toward the threaded end of said light body and disposed radially with respect to the threaded end thereof for making electrical contact with at least two of said at least three concentric electrical contacts of said head. 3. The light of claim 2 wherein: said at least two electrical contacts extend from an electrical circuit structure internal to said light body; orsaid at least two electrical contacts connect to an electronic circuit internal to said light body for controlling electrical power applied to said light source; orsaid at least two electrical contacts extend from an electrical circuit structure internal to said light body providing an electronic circuit internal to said light body for controlling electrical power applied to said light source. 4. The light of claim 1 wherein the light source of said head includes a first electrical lead connecting to one of said at least three concentric electrical contacts and a second electrical lead connecting to another one of said at least three concentric electrical contacts. 5. The light of claim 1 wherein said at least three concentric electrical contacts comprise a central spring contact, a first circular electrical contact surrounding said central spring contact, and a second circular electrical contact surrounding said first circular electrical contact. 6. The light of claim 1 wherein said head comprises a reflector having the light source of said head disposed in an opening therein and having a recess of a given shape in the rear end thereof, an insulating member of the given shape disposed in the recess of said reflector, wherein said insulating member supports a central one of said at least three concentric electrical contacts and a circular one of said at least three concentric electrical contacts. 7. The light of claim 6 wherein said reflector provides a third one of said at least three concentric electrical contacts. 8. The light of claim 6 wherein said reflector and said insulating member are circular, and wherein said light source includes a light emitting diode on a circular circuit board, wherein said insulating member supports said circular circuit board in a circular recess thereof. 9. The light of claim 8 wherein said reflector and the recess therein, said insulating member and the recess therein, said light emitting diode and said circular circuit board, are all concentric. 10. A head for a light comprising: a light source including a light emitting diode on a circuit board;a reflector proximate said light source for reflecting light produced by said light emitting diode;a threaded end for engaging a threaded opening of a light body for covering the threaded opening;at least three concentric electrical contacts at the threaded end and concentric therewith, wherein said at least three concentric electrical contacts are enclosed when said head is threaded to the light body,wherein said at least three concentric electrical contacts include a central spring contact, a first circular electrical contact surrounding said central spring contact, and a second circular electrical contact surrounding said first circular electrical contact;wherein at least one of said at least three concentric electrical contacts provides an electrical connection to said light source, andwherein at least one of said at least three concentric electrical contacts is for making an electrical connection to a source of electrical power of the light body;an insulating member supported by said reflector;wherein said insulating member supports said circuit board and ones of said at least three concentric electrical contacts. 11. The head of claim 10 wherein the light source includes a first electrical lead connecting to one of said at least three concentric electrical contacts and a second electrical lead connecting to another one of said at least three concentric electrical contacts. 12. The head of claim 10 further comprising: a light body having a cavity for receiving a source of electrical power therein, said light body having a threaded opening for engaging the threaded end of said head. 13. The head of claim 12 wherein the threaded opening of said light body provides an opening to the cavity of the light body, and wherein a source of electrical power may pass through the threaded opening. 14. A light comprising: a light body having a cavity for receiving a source of electrical power therein, said light body having a threaded opening to the cavity;a head including a light source, said head having a threaded end for engaging the threaded opening of said light body for covering the threaded opening and the cavity therein;at least three coaxial electrical contacts near the threaded end of said head and coaxial with the thread thereat, wherein said at least three coaxial electrical contacts are enclosed by said head and said light body when said head is threaded to said light body, and wherein at least one of said at least three coaxial electrical contacts provides an electrical connection to the light source of said head and wherein at least one of said at least three coaxial electrical contacts provides an electrical connection to a source of electrical power when a source of electrical power is disposed in the cavity of said light body,whereby said head may serve as a removable cover for facilitating the placing of a source of electrical power into the cavity of said light body and the removing of a source of electrical power from said light body. 15. The light of claim 14 wherein said light body includes at least two electrical contacts extending toward the threaded end of said light body and disposed for respectively making electrical contact with at least two of said at least three coaxial electrical contacts of said head. 16. The light of claim 15 wherein: said at least two electrical contacts extend from an electrical circuit structure internal to said light body; orsaid at least two electrical contacts connect to an electronic circuit internal to said light body for controlling electrical power applied to said light source; orsaid at least two electrical contacts extend from an electrical circuit structure internal to said light body providing an electronic circuit internal to said light body for controlling electrical power applied to said light source. 17. The light of claim 14 wherein the light source of said head includes a first electrical lead connecting to one of said at least three coaxial electrical contacts and a second electrical lead connecting to another one of said at least three coaxial electrical contacts. 18. The light of claim 14 wherein said at least three coaxial electrical contacts comprise a central spring contact, a first circular electrical contact surrounding said central spring contact, and a second circular electrical contact surrounding said first circular electrical contact. 19. The light of claim 14 wherein said head comprises a reflector having the light source of said head disposed in an opening therein and having a recess of a given shape in the rear end thereof, an insulating member of the given shape disposed in the recess of said reflector, wherein said insulating member supports a central one of said at least three coaxial electrical contacts and a circular one of said at least three coaxial electrical contacts. 20. The light of claim 19 wherein said reflector provides a third one of said at least three coaxial electrical contacts. 21. The light of claim 19 wherein said reflector and said insulating member are circular, and wherein said light source includes a light emitting diode on a circuit board having a given peripheral shape, wherein said insulating member supports said circular circuit board in a recess thereof having the given peripheral shape. 22. The light of claim 21 wherein said reflector and the recess therein, said insulating member and the recess therein, said light emitting diode and said circuit board, are coaxial. 23. The light of claim 21 wherein said reflector and the recess therein, said insulating member and the recess therein, said light emitting diode and said circuit board, are circular and coaxial. 24. A head for a light comprising: a light source including a light emitting diode on a circuit board;a reflector proximate said light source for reflecting light produced by said light emitting diode;a cylindrical end for engaging a cylindrical opening of a light body for covering the cylindrical opening;at least three coaxial electrical contacts at the cylindrical end and coaxial therewith, wherein said at least three coaxial electrical contacts are enclosed when said head engages the light body,wherein said at least three coaxial electrical contacts include a central spring contact, a first circular electrical contact surrounding said central spring contact, and a second circular electrical contact surrounding said first circular electrical contact;wherein at least one of said at least three coaxial electrical contacts provides an electrical connection to said light source, andwherein at least one of said at least three coaxial electrical contacts is for making an electrical connection to a source of electrical power;an insulating member disposed in said head,wherein said insulating member supports at least one of said at least three coaxial electrical contacts. 25. The head of claim 24 wherein the light source includes a first electrical lead connecting to one of said at least three coaxial electrical contacts and a second electrical lead connecting to another one of said at least three coaxial electrical contacts. 26. The head of claim 24 wherein: said insulating member is supported by said reflector; orsaid insulating member supports said circuit board; orsaid insulating member is supported by said reflector and supports said circuit board. 27. The head of claim 24 further comprising: a light body having a cavity for receiving a source of electrical power therein, said light body having a cylindrical opening for engaging the cylindrical end of said head. 28. The head of claim 27 wherein the cylindrical opening of said light body provides an opening to the cavity of the light body, and wherein a source of electrical power may pass through the cylindrical opening. 29. A light comprising: a light body having a cavity for receiving a source of electrical power therein, said light body having a cylindrical opening to the cavity through which the source of electrical power may pass;a head including a light source, said head having a cylindrical end for removably engaging the cylindrical opening of said light body for covering the cylindrical opening and the cavity therein;at least three coaxial electrical contacts near the cylindrical end of said head and coaxial therewith, wherein said at least three coaxial electrical contacts are enclosed by said head and said light body when said head is removably engaging said light body, and wherein at least one of said at least three coaxial electrical contacts provides an electrical connection to the light source of said head and wherein at least one of said at least three coaxial electrical contacts provides an electrical connection to a source of electrical power when a source of electrical power is disposed in the cavity of said light body,whereby said head may serve as a removable cover for facilitating the placing of a source of electrical power into the cavity of said light body and the removing of a source of electrical power from said light body. 30. The light of claim 29 wherein said light body includes at least two electrical contacts extending toward the cylindrical end of said light body and disposed for respectively making electrical contact with at least two of said at least three coaxial electrical contacts of said head. 31. The light of claim 30 wherein: said at least two electrical contacts extend from an electrical circuit structure internal to said light body; orsaid at least two electrical contacts connect to an electronic circuit internal to said light body for controlling electrical power applied to said light source; orsaid at least two electrical contacts extend from an electrical circuit structure internal to said light body providing an electronic circuit internal to said light body for controlling electrical power applied to said light source. 32. The light of claim 29 wherein the light source of said head includes a first electrical lead connecting to one of said at least three coaxial electrical contacts and a second electrical lead connecting to another one of said at least three coaxial electrical contacts. 33. The light of claim 29 herein said at least three coaxial electrical contacts comprise a central spring contact, a first circular electrical contact surrounding said central spring contact, and a second circular electrical contact surrounding said first circular electrical contact. 34. The light of claim 29 wherein said head comprises a reflector having the light source of said head disposed in an opening therein and having a recess of a given shape in the rear end thereof, an insulating member of the given shape disposed in the recess of said reflector, wherein said insulating member supports a central one of said at least three coaxial electrical contacts and a circular one of said at least three coaxial electrical contacts. 35. The light of claim 34 wherein said reflector provides a third one of said at least three coaxial electrical contacts. 36. The light of claim 34 wherein said reflector and said insulating member are circular, and wherein said light source includes a light emitting diode on a circuit board having a given peripheral shape, wherein said insulating member supports said circular circuit board in a recess thereof having the given peripheral shape. 37. The light of claim 36 wherein said reflector and the recess therein, said insulating member and the recess therein, said light emitting diode and said circuit board, are all coaxial. 38. The light of claim 36 wherein said reflector and the recess therein, said insulating member and the recess therein, said light emitting diode and said circuit board, are all circular and coaxial. 39. A head for a light comprising: a light source;a reflector proximate said light source for reflecting light produced by the light source;an end for engaging a light body;three coaxial electrical contacts at the end of said head, wherein said three coaxial electrical contacts are enclosed when said head engages the light body,wherein at least one of said three coaxial electrical contacts provides an electrical connection to said light source, andwherein at least one of said three coaxial electrical contacts is for making an electrical connection to a source of electrical power; andan insulating member disposed in said head,wherein said insulating member supports at least one of said three coaxial electrical contacts. 40. The head of claim 39 wherein said three coaxial electrical contacts include a central spring contact, a first circular electrical contact surrounding said central spring contact, and a second circular electrical contact surrounding said first circular electrical contact. 41. The head of claim 39 wherein the light source includes a first electrical lead connecting to one of said three coaxial electrical contacts and a second electrical lead connecting to another one of said three coaxial electrical contacts. 42. The head of claim 39 wherein: said insulating member is supported by said reflector; orsaid insulating member supports said light source; orsaid insulating member is supported by said reflector and supports said light source. 43. The head of claim 39 further comprising: a light body having a cavity for receiving a source of electrical power therein, said light body having an opening for engaging the end of said head. 44. The head of claim 43 wherein the opening of said light body provides an opening to the cavity of said light body, and wherein a source of electrical power may pass through the opening of said light body.