An architectural light fixture with a mounting includes a rigid yoke with opposed mounts aligned with external cavities located on a housing. The cavities have conical inner surfaces and bottoms with fastener engagements. Yoke pins include conical outer surfaces to operate as yoke locks. Fastener associated with the yoke pins engage to draw the yoke locks into interfering fit with the truncated conical inner surface of the mounting cavity. The light fixture housing has a port with a plug of porous water repellant material. A cover is employed to protect the plug. The light fixture housing also has a flat mounting surface with a wire access hole. The fixture includes a cover to enclose a photocell biased toward the mounting surface and retains an O-ring against the fixture housing.