I went from 2 X55 PC Super daylight bulbs to a new aqua medic 4X T5 54W and
run only one of the ballasts. The two 54W suspended 8 inches over the top
has done a much better job. The new kelvin rating is 6500 and a little
yellower but the difference is dramatic. Some slow growers are now thriving.

I would not recommend more than that on a standard 55 gallon tank though

Drew

"nikolay_kraltchev" wrote in message
om...
12 (yes, twelve) wpg is possible if you are well "prepared". It's a
question of establsihing a balance. Not a question of wpg, ml of
fertilizers, expensive equipment and such. Watch the plants they will
tell you if you are doing them good.

--Nikolay