Back to Lighting for a moment, here's a photo from another shoot I did in the same small stage I mentioned previously, but wherein you can actually see how much lighting we were using:
Basically, there are four banks of florescents (the large flat black boxes) arrayed to get the greenscreen lit evenly: two above, one to the left one to the right. There are five additional barn-doored stage lights on C-stands to illuminate the players.
Also note the black sound blankets
hanging from the ceiling to help deaden echoes.