Lighow much light for flowering...

I currently use 2 27W CFL's for my plant that is 18incs. (Streached). It has been really healthy and is now starting to flower, day 4 (4 Female 1 unknown, all bagseed). I know i need more light, but what could the miniumum i could get by with? My plants have about 9 nodes strached up to 19 inchs. How much yeild, if any will i be looking at?

you might get a few joints...lmao. ok maybe a little more. You really need to get as much light in there as possible. I used 7 cfl's for 1 plant.

4 plants at what you decribed might give you an ounce total...but it's really hard to tell...not easy to guesstimate on just words...well just hard to guess what any plant will give you.