Abstract: An interchangeable outdoor luminaire includes a housing having a circular top rim and a circular bottom rim with a circumferential recess, a plurality of interchangeable tops, and a plurality of interchangeable light transmissive doors. Each top has a circular rim with a flange that corresponds to the top surface of the housing, and each door has a circular rim with a circular edge that corresponds to the bottom surface of the housing. Because the dimensions of the circular rims of the tops are the same, and the dimensions of the circular rims of the doors are the same, any of the tops for the housing can be used with in conjunction with any of the light transmissive doors.