A process and apparatus reversibly converts an ellipsoidal stage lamp into a
projector for projecting light with
special effects onto a stage. The apparatus includes a replacement for the
shutter section, which is a cabinet for disposition within the ellipsoidal stage lamp to replace the
shutter section. The cabinet defines a first opening disposed along and around the
optical axis of the ellipsoidal stage lamp and which is open to the base and lamp having a filament. The cabinet has one open side for permitting the sliding
insertion of a drawer. The drawer, which is mountable to the cabinet, has a second opening disposed along and around the
optical axis of the ellipsoidal stage lamp and open to the base and lamp when the drawer is inserted to the cabinet. A movable
projector plane is mounted to the drawer across the second opening for
insertion to the cabinet at the open side.