Abstract: A lighting system, having a housing including an opening; a lamp configured to emit a light beam having a first width through the opening; and an adjustable iris system configured to define the first dimension of the light beam, the iris system having a first roller having a generally cylindrical shape having a first radial volute shaped groove defined in a lateral surface of the first roller; and a second roller having generally cylindrical shape having a second radial volute shaped groove defined in a lateral surface of the second roller, wherein the first and second shaped grooves define an iris aperture therebetween when aligned, wherein the first and second rollers are rotatable relative to one another, and wherein the defined iris aperture space has a second dimension that changes in response to rotation of the first and second rollers relative to one another, the first dimension corresponding to the second dimension when the light beam is emitted by the lamp.

Abstract: A stage light comprising a reflector, an incandescent source, a variable iris and an objective lens system, the position of the lamp and the iris opening being variable individually or in ganged fashion.