I forgot to ask but how deep is your tank?
Even if you cant tell a diffence you still have the option of overdriving the lamps.. Im assuming your tank is plenty deep enough for that.. IceCap ballasts with there program start, and getting good active ventilation will allow the lamps to survive the overdriving process better.. just a side note.. (4-54w T-5 HO
's can be overdrivin to put out roughly about the equivelnt to 500 Watts of the best output MH
lighing, 6500K Iwasaki with PFO HQI electroinc ballast kind of output, to give you an idea of the potential there)
.. I personaly couldn't fathoum the need to overdrive that much T-5 HO
lighting.. but man your tank is big..