Which Lights to choose for Lighting a large greenscreen?
 

Say you had a large greenscreen wall that was 20 feet wide and 13 feet tall.
Now what lights would you choose to light it properly? This needs to large enough to greenscreen a car.

Right now im looking at getting 3 of these: ( Ikan fluorescents)

http://www.ikancorp.com/pages/lights/s800/index.htm

Do you think this will work well? Is there a better solution? I haven't done all that much research yet...

What f-stop do you need to light the screen to?