Abstract: A down light fixture is assembled from parts that are substantially snap engageable and is installed through a ceiling orifice and supported by the ceiling without requiring permanent attachment to an existent support beam or the like. The light fixture comprises a can adapted to receive a lighting unit and installable through the ceiling orifice from its exposed side, and a decorative trim member removably and securely engageable with the can. The can is further provided with a flange on its free end that is positioned adjacent the exposed surface of the ceiling about the insertion orifice after the can has been inserted into the ceiling therethrough. The decorative trim member is rotatingly, removably and securely engageable with the flange to provide an exterior trim to the fixture. Several parts of the lighting fixture are removable and replaceable to vary the appearance of the light fixture without removal of such fixture from the ceiling.