Great classic units from Show Pro! These are the Dichro Flower flower units that feature a HTI 150 discharge bulb in front of a large white and multi-color dichoric dish. The units produce super rich - concentrated colors due to the arc lamps. Each unit features a highly complex control system where you can use no controller (Self Operated), dedicated 19" rack mount controller or black out controller to operate. These units have blackout shutters that prevent you from having to turn the units on and off thus lowering the life of the lamp. With operation with the 19" controller you have the option to control direction, speed and audio response of the dichro dishes. Super great units made here in the US!