I bought a westcot softbox kit that has a 1000 W and a 500 Watt softbox. I set these up in a 20 x 15 room and my camera (Nikon D70) still wants to use the flash and I fluctuate between a shutter speed of 1/30 and 1/60. What's going on?? I then moved it into a smaller room - about 10 x 10 - and got the same problem. Ceilings are 8 feet. How much light do I need to be able to shoot? Should I have got a 3 light kit?