Hi, this is my first post. My question in short is - does anybody have an idea of how "powerful" a novatron 240ws unit is with 3 lights? The reason I ask is because I plan on shooting a portion of a ballroom for a rich mansion scene with party goers. I'll be shooting at a wall probably 24 feet away, and the width of the scene will probably be 15 feet. This scene will have models in the foreground about 6-10 feet away. I will be shooting with a hasselblad 6x4.5 with a 50mm lens. So I'm thinking F 11-16 would be great. I currently own one vivitar 285 flash and I guesstimate that if I had 4 of them at full power shooting at walls and brollys it would provide enough light. For another power reference: If it were a movie I think I could make it work with an assortment of 2-5k HMI units by shooting at the ceiling and through windows with diffusion. Think of the general ambient light of the ballroom lighting in True Lies, except of course not the whole ballroom. Link: http://www.youtube.com/watch?v=RplvG413xEg&feature=related So there are two references to the kind of power I want. I'm looking into getting a used novatron kit from ebay, and I've heard that AC units are generally A LOT more powerful than battery flash units like my vivitar 285. I've achieved this look before but in a smaller room with hot lights in softboxes and 500watt bulb china balls. I think I ended up at 1/60 at F4. Any ideas? I suspect that I don't need a super powerful Watt Second kit, I plan on shooting the flashes onto white boards and through brollys. Thanks I hope somebody has an idea for how much power these units have.