I purchased a used 45 S Beseler Color Head and checked it out. Yes, each color worked just fine. Later on, I noticed that there was a delay between when power was supplied and when the light came on. This delay could be either a split second or 10 or 12 seconds long. Bummer! Yesterday, I checked out a second 45 S Beseler head, and it had the same problem, though not so pronounced. Again, Bummer! I've heard of others with the same problem. You get the idea; be careful about buying these heads used. Mine's still usable. I plan to swap out the power for the light bulb with a connection to a $60 Variac variable, 600 watt (or so) voltage transformer. That way I can use the same 83 volt bulbs that are intended for the 45 S head. I will also connect the Variac to a voltage stabilizer.