A lighting fixture includes a base having a hole in a top surface thereof, at least one retaining member disposed on the top surface of the base proximate the hole, a lamp housing having a top portion and a dome-shaped bottom portion, the bottom portion including a perimeter portion having an essent
A lighting fixture includes a base having a hole in a top surface thereof, at least one retaining member disposed on the top surface of the base proximate the hole, a lamp housing having a top portion and a dome-shaped bottom portion, the bottom portion including a perimeter portion having an essentially planar annular end surface sized to surround the hole, at least one boss extending from the perimeter portion of the lamp housing, and a handle attached to the top portion of the lamp housing, where the retaining member is structured for receiving the boss with the annular end surface of the lamp housing abutting the top surface of the base and surrounding the hole, so that rotation of the handle effects twist-locking attachment or detachment of the lamp housing respectively to or from the base by rotating the boss into or out of engagement with the retaining member.
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What is claimed is: 1. A lighting fixture, comprising: a base having a hole in a top surface thereof; a lamp housing having a top portion and a dome-shaped bottom portion, the bottom portion including a perimeter flange portion having an essentially planar annular end surface sized to surround the
What is claimed is: 1. A lighting fixture, comprising: a base having a hole in a top surface thereof; a lamp housing having a top portion and a dome-shaped bottom portion, the bottom portion including a perimeter flange portion having an essentially planar annular end surface sized to surround the hole, the perimeter flange portion resting on the top surface of the base surrounding the hole; at least one boss extending substantially vertically from the perimeter flange portion of the lamp housing: at least one retaining member disposed on the top surface of the base proximate the hole and structured for receiving the boss; and means for rotating the lamp housing, thereby effecting twist-locking attachment/detachment of the lamp housing to/from the base by rotating the boss into/out of engagement with the retaining member. 2. The lighting fixture of claim 1, wherein the retaining member comprises urging means for urging the annular end surface of the lamp housing against the top surface of the base. 3. The lighting fixture of claim 1, further comprising a reflector disposed in the lamp housing. 4. The lighting fixture of claim 1, wherein the base includes at least one curved guide disposed on the top surface and structured to maintain concentricity between the lamp housing and the hole as the lamp housing is rotated. 5. The lighting fixture of claim 4, wherein the perimeter portion includes a laterally extending section for inhibiting further rotation by abutment with the curved guide. 6. The lighting fixture of claim 1, wherein the retaining member includes a flat spring adapted to be deformed by engagement with the boss. 7. The lighting fixture of claim 1, wherein the base and the lamp housing are each cast metal. 8. The lighting fixture of claim 1, wherein the lamp housing includes at least one lamp socket and at least one corresponding conduit fitting adapted for directly receiving and securing a conduit proximate the lamp socket. 9. The lighting fixture of claim 1, wherein the lamp housing includes a primary lamp socket located t a center of the lamp housing and includes a primary lamp socket access chamber located above the primary lamp socket. 10. The lighting fixture of claim 1. wherein the base and the lamp housing are each cast metal, and wherein the primary lamp socket has a cast metal heat dissipation portion adapted to fit within the primary lamp socket access chamber. 11. The lighting fixture of claim 1, wherein the means for rotating the lamp housing comprise a handle attached to the top portion of the lamp housing. 12. The lighting fixture of claim 1, wherein the means for rotating the lamp housing comprise a tool attachment member disposed on the lamp housing and a tool adapted for securely engaging the tool attachment member, so that rotation of the tool effects the rotating of the lamp housing. 13. The lighting fixture of claim 1, wherein the means for rotating the lamp housing comprise a grip-able surface on the dome shaped bottom portion of the lamp housing. 14. A method of servicing a lighting fixture, comprising: providing a base having a hole in a top surface thereof; providing a lamp housing having a longitudinal axis, a top portion and a dome-shaped bottom portion. the bottom portion including a perimeter portion having an essentially planar annular end surface sized to surround the hole; providing at least one boss extending from the perimeter portion of the lamp housing; providing at least one retaining member disposed on the top surface of the base proximate the hole and structured for receiving the boss with the annular end surface of the lamp housing abutting the top surface of the base and surrounding the hole; and rotating the lamp housing about its longitudinal axis, thereby rotating the boss into or out of engagement with the retaining member and effecting twist-locking attachment/detachment of the lamp housing to/from the base. 15. The method of claim 14, wherein the lamp housing includes a lamp installed therein, the method further comprising: lifting the lamp housing; and relamping the lamp, from a user position above the lighting fixture. 16. A method of relamping a lighting fixture, comprising: providing a base having a hole in a top surface thereof; providing a lamp housing with a bottom surface that rests on the top surface of the base and surrounds the hole, the lamp housing having a top portion and a handle secured to the top portion, the lamp housing having a socketed lamp disposed therein: providing a twist-lock apparatus for rotatably locking the lamp housing to the base; twisting the handle counter-clockwise, thereby unlocking the lamp housing from the base; lifting the lamp housing by the handle and positioning the lamp housing so that the lamp may be accessed from a user position above the top surface of the base; replacing the lamp; lowering the lamp housing having a replaced lamp onto the base using the handle; and twisting the handle clockwise, thereby locking the lamp housing to the base. 17. The method of claim 16, further comprising providing structure for urging the lamp housing against the base when locking the lamp housing. 18. A lighting fixture, comprising: a base having a hole in a top surface thereof; a lamp housing having a top portion and a dome-shaped bottom portion, the bottom portion including a perimeter portion having an essentially planar annular end surface sized to surround the hole; at least one boss extending from the perimeter portion of the lamp housing; at least one retaining member disposed on the top surface of the base proximate the hole and structured for receiving the boss with the annular end surface of the lamp housing abutting the top surface of the base and surrounding the hole, the retaining member having a flat spring adapted to be deformed by engagement with the boss; and means for rotating the lamp housing, thereby effecting twist-locking attachment/detachment of the lamp housing to/from the base by rotating the boss into/out of engagement with the retaining member. 19. A lighting fixture, comprising: a base having a hole in a top surface thereof; a lamp housing having a top portion and a dome-shaped bottom portion, the bottom portion including a perimeter portion having an essentially planar annular end surface sized to surround the hole, the lamp housing further having a primary lamp socket positioned at a center of the lamp housing and a primary lamp socket access chamber positioned above the lamp socket; at least one boss extending from the perimeter portion of the lamp housing; at least one retaining member disposed on the top surface of the base proximate the hole and structured for receiving the boss with the annular end surface of the lamp housing abutting the top surface of the base and surrounding the hole; and means for rotating the lamp housing, thereby effecting twist-locking attachment/detachment of the lamp housing to/from the base by rotating the boss into/out of engagement with the retaining member. 20. The lighting fixture of claim 19, wherein the base and the lamp housing are each cast metal and wherein the primary lamp socket has a cast metal heat dissipation portion adapted to fit within the primary lamp socket access chamber.
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