A rotatable luminaire (60a, 60b, 70) comprising: a luminaire housing (52a, 52b); a cardan mechanism rotatably connected to the luminaire housing (52a, 52b); and a light source housing rotatably connected to the cardan mechanism; wherein the cardan mechanism comprises: a generally circular ring having a first inward connector having a through hole and extending inwardly a predetermined distance from the ring component along a first axis; a second inward connector portion having a through hole and extending inwardly a predetermined distance from the circular ring component along the first axis opposite the first inward connector; a first outward connector comprising a through hole and a first tab and extending outwardly a predetermined distance from the ring component along a second axis; and a second outward connector comprising a second through hole and a second tab and extending outwardly a predetermined distance from the circular ring component along the second axis opposite the first outward connector, characterized in that the first tab and the second tab are configured for movement within openings (62a, 62b) having predefined dimensions in walls of the luminaire housing (52a, 52b), such that the predefined dimensions of the openings (62a, 62b) define the rotation range of the light source housing when rotated about the second axis. a luminaire housing (52a, 52b); a cardan mechanism rotatably connected to the luminaire housing (52a, 52b); and a light source housing rotatably connected to the cardan mechanism; wherein the cardan mechanism comprises: a generally circular ring having a first inward connector having a through hole and extending inwardly a predetermined distance from the ring component along a first axis; a second inward connector portion having a through hole and extending inwardly a predetermined distance from the circular ring component along the first axis opposite the first inward connector; a first outward connector comprising a through hole and a first tab and extending outwardly a predetermined distance from the ring component along a second axis; and a second outward connector comprising a second through hole and a second tab and extending outwardly a predetermined distance from the circular ring component along the second axis opposite the first outward connector, characterized in that the first tab and the second tab are configured for movement within openings (62a, 62b) having predefined dimensions in walls of the luminaire housing (52a, 52b), such that the predefined dimensions of the openings (62a, 62b) define the rotation range of the light source housing when rotated about the second axis. a generally circular ring having a first inward connector having a through hole and extending inwardly a predetermined distance from the ring component along a first axis; a second inward connector portion having a through hole and extending inwardly a predetermined distance from the circular ring component along the first axis opposite the first inward connector; a first outward connector comprising a through hole and a first tab and extending outwardly a predetermined distance from the ring component along a second axis; and a second outward connector comprising a second through hole and a second tab and extending outwardly a predetermined distance from the circular ring component along the second axis opposite the first outward connector, characterized in that the first tab and the second tab are configured for movement within openings (62a, 62b) having predefined dimensions in walls of the luminaire housing (52a, 52b), such that the predefined dimensions of the openings (62a, 62b) define the rotation range of the light source housing when rotated about the second axis.