A beam shaper module and an automated luminaire are provided. The beam shaper can be installed on or removed from an automated luminaire that produces a plurality of beams of light. The beam shaper module includes a housing, a beam shaper, one or more motors, and a control circuit. The housing detachably couples to a light emitting face of a head of the luminaire. The beam shaper includes an array of ribbed lenses, each lens extending across the beam shaper and receiving light from fewer than all of the light beams. The motor(s) rotate the beam shaper about an axis of rotation coincident with an optical axis of the luminaire. The control circuit receives power and control signals from the luminaire and, in response to the control signals, controls rotation of the beam shaper using the motor(s).