lighting a 20X20 eefx or chroma-key.com green screen...

For a 20X20 you are going to need alot more light or shoot outside. For something like that I use 3 6K space lights or two 10k's bounced at a 45 degree angle. I suppose 5k's might work. You might also consider Mole Sky Pans.

Of course, none of this is a budget solution. Possibly some Home Depot 4 foot florescents with good daylight tubes. The problem is rigging them so they light the center of a 20X20 as equal as the sides. Florescent light falls off very fast.
 
One 6k space light is more than enough to light a 20x20 chroma screen. Then you need to front light your talent and add a little back light to taste.
 
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