I'm going to be filming some martial arts videos, and I need a light setup. I need the light to cover a very broad area...maybe 15-20 feet wide and at least 10 feet back...any ideas for a cheap setup for this? I was thinking about maybe trying 2 big construction lights, and then a white posterboard to reflect the light back onto the subject...

I also saw these, would these be powerful enough to light up a big scene?

http://cgi.ebay.com/800-W-STUDIO-VID...d=p4634.c0.m14

I've done a lot of reading, but most of the reccomendations seem to be for mainly close up shots...and mine will be people moving around and fighting etc so it will be hard to maintain a closeup.