Question about Light, gallon, and Bio-Filter - Please Help. Thanks...

[FBNitro]

1) Total for all 8 bulbs
2) 8 T5's should be fine for hard corals assuming they have individual reflectors, otherwise I couldn't tell you.
3) Watts per Gallon means nothing! It's all about lighting levels, PAR readings etc. Compact Florescents and T5's use about the same wattage, but T5's (because of individual reflectors etc) will generally blow Compact Florescents out of the water in lighting levels.
4) Over time, the lights change wavelength and lose brightness. You're going to have to run them ~8-12 hours a day to support your tank, just replace them yearly unless you have an accurate way to determine the bulb status.
5) I would only grow them in the refugium. The overflow should be free of things IMO so it doesn't get clogged accidentally and your tank overflows.

I would have chosen a different bulb mix w/8 bulbs... when you replace them, you should do some research on recommended bulb setups.