This PIC microcontroller Disco Light looks like it produces the same effect as the professional ones costing big dollars.

“This is an early picture of my discolight effect. Because of the AGC circuit theres no need for potentionmeters for sensitivity adjust. I replaced them with trimmers. Now the microphone is on the control electronics because theres no need to place it outside the box and the possible noises from the surroundings are reduced. You have to choose the distance between Lens-Lamp-Parabola to get sharp beams. Its all about optics.That little ΄wall΄(hindrance) before the Lamp doesnt let the white light to pass through the Lens.”