A light emitting diode (LED) light engine is provided for use in a light fixture to enable improved and efficient dissipation of heat generated in the light fixture. The light engine includes a circuit board that includes multiple LEDs for emitting light. The light engine includes a chassis that has a plurality of upper fins that extend upward from a central flanged portion to dissipate heat generated by the LEDs into the lighting fixture. The circuit board is mounted to a mounting surface on the chassis that is surrounded by a fin wall that depends from the central flanged portion. The chassis also has a plurality of lower fins that extend outward from an outer surface of the fin wall to dissipate heat out of the fixture and into the ambient air environment.