A luminaire comprising: a heat spre

A luminaire comprising: a heat spreader and a heat sink thermally coupled to the heat spreader; an outer optic retained relative to at least one of the heat spreader and the heat sink; a light source disposed in thermal communication with the heat spreader, the light source comprising a plurality of light emitting diodes (LEDs) that are disposed on the heat spreader such that the heat spreader dissipates heat from the plurality of LEDs; and a power conditioner configured to receive AC voltage and to deliver DC voltage to the plurality of LEDs, the power conditioner being disposed on a same side of the heat spreader as the plurality of LEDs;wherein a combination defined by the heat spreader, the heat sink and the outer optic is so dimensioned so as to: cover an opening defined by a nominally sized can light fixture, and cover an opening defined by a nominally sized electrical junction box.