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.
