After testing several we had best luck with Rosco's "Chroma Green"
#389. What we found was the added green lowers the red channel giving more separation. If I had KinoFlos for this I'd probably use their green tubes in the fixtures for the same reason. I don't use gels for head-to-toe because then I'd definitely be splashing green gelled light on the feet. If I left the light on the floor surrounding the feet "white" then the floor green wouldn't match the background/wall green.
By the way, I use Rosco green paint in our studio, A Wescott green screen for small location shots and occasionally a giant roll of green photographer's paper backdrop when I want a seamless floor-to-wall screen on-location,(my least preferred).
Mark D'Agostino
http://www.synergeticproductions.com
