Great projector from Programmi Sistemi Luce (PSL). This is the Oil Color Effect unit that features a 13.8 volt, 85 watt DED MR16 bulb that acts as the light source. The light shoots through a convex lens then through the oil wheel then finally through an adjustable front convex lens that focuses the beam. The output is constantly changing psychedelic images. Currently the wheel has no color as the oil has lost the pigment. Will require a replacement. This unit was phased out and the PSL Liquid Light took its place. That unit contains better output (100 watt) and adjustable speeds on the rotation. Great unit made in Italy!