I would either swap those three out for blubs with a higher wattage, or get some Y splitters and double them up. Another thing to take into consideration is venting more bulbs. More/bigger bulbs = more heat.
yea as a minimum .. atlest buy 3 Y splitters and 3 more bulbs and double your light ..
even better get some 23W bulbs insted .. also 3 new insted of them 14W ..
dunno how big you can go with CLFs with the "normal" sockets ?
but try to get some more bulbs and some high`r watts in ther .. its your biggest problem .. rest look good ..
would be kind a foolish to use 200$ on that box and what ever on seeds aso. and then dont use 20-40$ more to upgrade them lights ..
I would mostlikely trash them lights all together .. screew em out and take some mesurments and buy a nice T5HO fixture that can fit the space ..
can allways use them small CLFs later on for side lightning or to start seedlings out side on a table etc.
and its easy to get more lights in ther .. you just open the box and trow em in .. no realy .. come on please .. use commen sens and some logic .. no offend .. I guess you aint working with your hands on daily bases as I am ..
but dont your light/hydro system aso. have a wire going out of the box ? .. conect them ther .. run the wiers out the same spot
or "steal" the power from the wiers allready in ther (remove all plugs from the box .. clip the wire .. fit a wire connector and connect boath lamps to the power cord ..
no problem .. specialy with CLFs .. I have done it with my 3 lamps (2x49W T5HO) so I just have one wire to connect to my plug in the wall ..
just be carefull and remember to unpluk all wires before working with eletricity ..
p.s.
my best guess would be 2 grams per plant with the light you got now ..
with 3 Y splits and 6 23W bulbs I reccon 10-20 grams a plant maybe ...
a nice 4-6 bulb 2 feet T5HO fixture with 2700K bulbs and the CLFs for side lightning and you might be able to get 1-2 oz per plant ..
just guesses .. dont blame me