Patent Number: 
Section: claims

1. A replacement light apparatus for a radiation generating device, comprising:a base plate;a grip plate extending from a first surface of the base plate;a bearing member extending from a second surface of the base plate that is opposite the first surface, the bearing member including a bearing surface disposed in a first plane that is perpendicular to a second plane, in which the base plate is disposed; anda light source mounted on the bearing surface of the bearing member and adapted to project a cone of light centered on an illumination axis that extends perpendicular to the bearing surface. 2. The apparatus of claim 1, wherein the light source is mounted flush on the bearing surface. 3. The apparatus of claim 1, wherein the light source comprises a light-emitting-diode centered on the illumination axis. 4. The apparatus of claim 1, wherein the bearing member comprises a bearing plate and a body portion disposed between the base plate and the bearing plate, the bearing plate defining the bearing surface and the body portion including a through-bore for accommodating an electrical connection for the light source. 5. The apparatus of claim 1, further comprising a circuit connected to the light source for driving the light source, the circuit including a pair of drivers connected in parallel. 6. The apparatus of claim 5, wherein each of the pair of drivers includes a 500 mA AC/DC driver. 7. A replacement light apparatus for a radiation generating device, comprising:a base plate;a grip plate extending from a first surface of the base plate;a bearing member extending from a second surface of the base plate that is opposite the first surface, the bearing member including a bearing surface disposed in a first plane that is perpendicular to a second plane, in which the base plate is disposed; anda light-emitting-diode mounted on the bearing surface of the bearing member and adapted to project a cone of light centered on an illumination axis that extends perpendicular to the bearing surfacea power sourced connected to the light-emitting-diode; anda pair of light-emitting-diode drivers connected in parallel between the light-emitting-diode and the power source. 8. The apparatus of claim 7, wherein each of the pair of light-emitting-diode drivers includes a 500 mA AC/DC driver. 9. The apparatus of claim 7, wherein the light-emitting-diode is mounted flush on the bearing surface. 10. The apparatus of claim 7, wherein the light-emitting is centered on the illumination axis. 11. The apparatus of claim 7, wherein the bearing member comprises a bearing plate and a body portion disposed between the base plate and the bearing plate, the bearing plate defining the bearing surface and the body portion including a through-bore for accommodating an electrical connection with the power source and light-emitting-diode drivers. 12. A radiation generating device, comprising:a linear particle accelerator;a collimator arranged in proximity to the linear particle accelerator for aligning the particles departing the accelerator and projecting a radiation field; anda light projector comprising:a housing,an optical assembly carried by the housing and having an optical axis, anda light fixture removably disposed in the housing, the light fixture including a bearing plate defining a bearing surface disposed in a first plane that is perpendicular to the optical axis, and a light source mounted on the bearing surface and centered on the optical axis, the light source adapted to project a cone of light centered on an illumination axis that is coaxial with the optical axis. 13. The device of claim 12, wherein the light projector comprises a field lamp projector for providing an illuminated estimation of the radiation field projected from the collimator. 14. The device of claim 12, wherein the light projector comprises an optical distance indicator and the optical assembly includes a lens carrying a plurality of numbers for being projected on a radiation target for indicating a distance between the collimator and the target. 15. The device of claim 12, wherein the light source is mounted flush on the bearing surface. 16. The device of claim 12, wherein the light source comprises a light-emitting-diode centered on the illumination axis. 17. The device of claim 12, wherein the bearing member comprises a bearing plate and a body portion disposed between the base plate and the bearing plate, the bearing plate defining the bearing surface and the body portion including a through-bore for accommodating an electrical connection for the light source. 18. The device of claim 12, further comprising a circuit connected to the light source for driving the light source, the circuit including a power source and a pair of drivers connected in parallel between the power source and the light source. 19. The device of claim 18, wherein each of the pair of drivers includes a 500 mA AC/DC driver. 20. A method of upgrading a radiation generating device, the method comprising:removing a cover from a collimator of the radiation generating device; andreplacing an existing light fixture with an upgraded light fixture, including:disconnecting the existing light fixture from a power source,removing the existing light fixture from a light fixture housing by sliding the existing light fixture out along a linear axis of a socket of the housing, in which the existing light fixture resides,connecting the upgraded light fixture to the power source, andcentering a light source of the upgraded light fixture on an optical axis of an optical assembly carried by the housing by sliding the upgraded light fixture into the socket of the housing along the linear axis, the optical axis being perpendicular to the linear axis of the socket. 21. The method of claim 20, wherein the light source of the upgraded light fixture comprises a light-emitting-diode and wherein connecting the upgraded light fixture to the power source comprises connecting a pair of light-emitting-diode drivers in parallel between the power source and the light-emitting-diode. 22. A method of projecting a pattern of light on a target of a radiation generating device, the method comprising:emitting a cone of light to produce a pattern of light on the target, wherein the cone of light is emitted along an illumination axis with a light source, the light source being carried by and removably disposed in a projector housing of the radiation generating device and the illumination axis being disposed coaxially with an optical axis of an optical assembly carried by the projector housing. 23. The method of claim 22, wherein emitting the cone of light to produce a pattern of light comprises estimating a pattern of radiation on the target. 24. The method of claim 22, wherein emitting the cone of light comprises emitting the cone of light through a lens carrying a plurality of numbers such that the pattern of light comprises one or more numbers projected on the target, the one or more numbers indicating a distance between the radiation generating device and the target. 25. The method of claim 22, wherein emitting the cone of light comprises energizing a light-emitting-diode. 26. The method of claim 22, further comprising projecting a radiation field onto the target with the radiation generating device.