I just bought one of these at a garage sale, and I don't really know anything about it. It has 3 flash heads; 2 of them work and the third has a broken flash lamp. Can I buy a replacement, or do I just have to buy a whole new flash head? Can I use any lightbulb I want for modeling lamps? Only one of them has a modeling lamp bulb in it. It has a switch that says 440 and 220. Are these line voltages? Cause here in Texas we have 120V mains. I paid $50, is that a decent price?