A framing projector providing for alternatively mounting different optical lighting effect elements is disclosed. The projector includes a housing having a low voltage light source mounted to a removeable rear end-cap at the rear of the housing for directing a beam of light through a removeable optical...http://www.google.com/patents/US4636925?utm_source=gb-gplus-sharePatent US4636925 - Framing projector for use in a track lighting system
