I don't know much about the Odyssea T5's, but a friend got a 175W DE, dual fixture with PC's a few years back (only DE 175W I've ever seen) and it left a lot to be desired. The T5's may be fine, though. Check out Hellolights, too and see what they have. It seems like they had a decent set up for $100 or so a few months back. When looking at T5's, the W reflectors are the best way to go. The ones with flat reflectors (one solid flat back for all bulbs) don't put nearly as much light down to the tank as individual reflectors (or W shapes), but you are using the same amount of elec and same heat... Tek lighting has a good fixture (for an idea of what I mean by W reflectors, if you aren't sure), and I think the Hellolights fixtures were similar.