A downwardly directed fixture is provided which has a fixture face, said face having a first and second annular recess, the first annular recess receiving a reflector flange and the second recess receiving a lens. The reflector flange is then held in position by a removable arc-shaped retention spri...http://www.google.com/patents/US7465077?utm_source=gb-gplus-sharePatent US7465077 - Retention spring for luminaire reflector
