When I used florescent lighting several years ago, I was able to get 6 adult plants under 4 of the dual bulb florescent tube fixtures. I might have been able to get 8 but didn't want to over crowd the area since light depth is a bit of an issue with floros. The lights were also a mix of the cool whites and the warm whites, depending on cycle. I used 2 warm white for every 1 cool white for flowering and 2 cool white for every 1 warm white when vegging.
The lights were kept about 2" above the canopy and yields were approximately 15 oz. from 6 adult ladies. Canopy penetration is not much more than 12" so maintaining an even canopy is beneficial. Since I had little access to do any training in the flower area, they would get a topping just before they went into flower and I would hope that the canopy would stay even. It didn't always work out.
The stuff within those first 12" was good quality bud. You won't get donkey dick density ... you'll get flowers about the size of a healthy grape.
