I have an Aqua Japan 48Ē 54W x 6 6500K T5 HO fixture.
My tank is a 110G and I have 384 Watts 3.5WPG
Make the switch and go for 3WPG and you will be able to grow most anything. But make sure you use CO2 and Ferts, and a good substrate will give you even better results.
Buy the best you can afford and your purpose, Iím glad I did. T8 vs T5 is like comparing a Ferrari to a Toyota Camry, if you want a race car donít buy a family car and expect results.
If you don't mind me asking, what kind of T-5 did you get, 100w 6700k bulbs?
Is your tank 75G as well?
I was always afraid to make the switch, because from what I can understand, is that the watts per gallon for CF is different than for T5... no idea how big of a light i'd need to get.