Modular light engine for variable light pattern

A light fixture for illuminating a parking lot or street comprising a post adapted to engage the ground at a first end and receive at least two light engine modules at an opposite end, said modules including a plurality of light emitting diodes disposed on a planar surface, said light emitting diodes being disposed in at least two generally concentric semi-circular arrays, said arrays disposed in a shared plane, said modules being at least substantially identical, each module including a light emitting diode inclusive surface and an opposed surface, said opposed surface including a plurality of vanes, wherein each module includes sides that are bounded by shoulders extending perpendicularly from said opposed surface and wherein said shoulders meet at an edge rigidly mounted to said post and wherein each module is individually secured to said post such that the planar surface of each module permanently resides in a plane perpendicular to a longitudinal axis of the post, said fixture further comprising an electrical path for providing electrical power to said modules, and wherein said light engine modules are spaced from the ground such that the area of the light engine modules is less than an area of the ground lighted by said fixture.