An improved heat sink for a lighting fixture includes an inner heat sink conductively coupled to a lighting subassembly, a plurality of cooling fins conductively coupled to and extending away from the inner heat sink, and an outer heat sink coupled to the cooling fins and offset from the inner heat sink. The outer heat sink includes a lower heat sink coupled to a first set of cooling fins mounted on the inner heat sink, and an upper heat sink coupled to a second set of cooling fins. A plurality of air vents extend through the outer heat sink and are aligned with a corresponding plurality of the first set of cooling fins.