I have the option of using my color head w/dichro filters, or my cold light head and Kodak Polymax Filters, mounted in frames, that slide above the lens. One other option I have is to use 2 Kodak Wratten filters, deep blue (#47B) and green (#56) with a 3x3" view camera filter holder attached to the lens. This set-up is best for precise split-grade printing with cold light. For general production type work I use the Polymax filters (I've been using the same ones for years - no problems). I never use my color head because of the limited filtration range and fiddling with the dials is an added chore that breaks my concentration.