oh boy, not this can of worms again...
It's personal preference.
you will find compelling arguments for pc's, mh and t5's.
Myself, I have 300 watts of DE Halides and 260 watts of PC lighting over my 24' deep 72 bowfront and couldn't be happier.
I had a single 65w 50/50 pc over my old 36 gallon bow (18' deep) and grew just softies, mushrooms and kept the odd LPS with no problem.
Trial and error my friend, but in my opinion you'd be just fine on that tank with either pc or t5, plus you can always upgrade later if you need or want to.
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