Conducted with a single craftsman 500w work light and a frost white shower curtain slung between stands. Canon XL1s with zebras set to 85 f-stop set so zebras just appeared on the keylight side of the subject's (my) face. We did this test to try to figure out how to get rid of the "Hotspot" that happens so often in lower budget indie films. I just read somewhere that Hollywood favors larger lights farther from the subject and wanted to find out how much difference distance made. The shower curtain ends up as about a 6'x6' light once the light from the worklight is intercepted. Enjoy!
Full results at http://yafiunderground.com/index.php?page=lighting_distances
Full results at http://yafiunderground.com/index.php?page=lighting_distances