Was speaking to a friend earlier about this he told me the most if yield is around 7 gram
if you like fluorescent lighting, I would surgest you get some induction lamps or T5 lamps instead
the 105w 3000k cfls can make buds but you`ll get .25g per watt if your lucky
small led lights make more sense there not even expensive now
cob and smd types seem to be best
you can get BC and E27 cap led lights for almost nothing
or 40w to 400w induction lamps are cheap, I got a 300w induction off ebay for £30 a month or so ago and have seen many on there cheap
there better than cfl`s not quite as good gpw wise as hids are but they are fun lights to use
I mix them with leds as I think florescent lights add a little something nice to have one in a grow space, but I normally use them along side led or hid`s