If you compare the prices between HO T5 replacement bulbs & 96w PC bulbs, (ie. OA) there's only a few dollars difference. Seriously, if you're going to spend that kind of money "upgrading" your lights, consider a MH system, since 2 HO T5s will still not be really upgrading anything but the LFS's bottom line. A single 150 DE or 175w Mogul would give you much more bang for the buck if you're doing corals in a 3' tank.
JMO & JME,
Anthony
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