A luminaire comprising: a heat sink

A luminaire comprising: a heat sink comprising a sidewall and a base that, in combination, define a recess;a light source carried by the heat sink and configured to emit a source light, the light source comprising a heat spreader that is fittedly disposed in the recess of the heat sink and has an inner surface and an outer surface, the heat spreader comprising a printed circuit board, and a plurality of light-emitting diodes (LEDs) disposed generally along an outer peripheral perimeter portion of the inner surface of the heat spreader, and positioned in thermal communication with the heat spreader; a reflector disposed generally coextensive with the plurality of LEDs and comprising an aperture formed in a medial region thereof, an outer edge of the aperture defining an inner rim of the reflector; and light guide positioned between the reflector and the light source, the light guide comprising a propagation region and light spreader, defined as at least one of a plurality of deformations and a plurality of lens portions, wherein the light spreader and the propagation region, in combination, are configured to change the source light into a first shaped light; wherein the source light is emitted from the light source incident upon the reflector, and is changed by the light spreader and the propagation region of the light guide into the first shaped light that is directed by the light guide through the aperture; and wherein a combination of the light source, the heat sink, and the reflector has a overall outside height H and an overall outside dimension D such that the ratio of H/D is equal to or less than 0.25.