can anyone out there tell me if there is a dimmer switch for tungsten lighting? I am working in very tight areas so moving the light further back is not enough. I have two units a 1000W unit and a 500W unit. I have a large (42") softbox on the 1000 and a (24") on the Hex softbox on the 500. I could go buy a bunch of different bulbs. What would the pros and cons be if any? Any help would be GREATLY APPRECIATED. Thanks.