Heres a little info on my current tank and lighting:
75gal
1x175w mh 14k bulb
1x54w t5 actanic
1x54w t5 10k
Not sure how many watts the pc set up is
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If your canopy is well ventilated, go for it. But, PC lamps produce a lot of heat. Dare I say almost as much as a Metal Halide does. So, really, it's your choice and your tank. If you don't have a well ventilated canopy, may I suggest cutting a couple of holes and adding an in and out fan? Just something small to keep air circulating...
more options with t5 than pc for color imo
Go to the first link here.
Also a good connected read here. Again go to first link.