Abstract: An improved extruded track lighting system having a support rail with a pair of cylindrical conductors exposed on an insulating extrusion. Various light fixtures having clamp brackets may be easily snapped on and off the support rails. Each of the clamp brackets includes a pair of parallel flat legs having gripping portions to conform with exposed cylindrical conductors on either side of the support rail. Alternatively, the clamp brackets may include outwardly extending tangs which can be forced between a pair of conductors on the interior of the extrusion. The brackets are simply swiveled with respect to the rail to couple or remove. No independent fastening means are needed to tighten the clamp brackets to the support rails. In one embodiment a light fixture includes a single swivel axis, while in another embodiment a light fixture includes a universal joint providing two orthogonal swivel axes between the lamp and the support rail.