T6 is actually more efficient in terms of lumens per watt, but the larger size means less bulbs able to fit in a given area. You are also significantly limited on bulb choice as only a few cheap ebay sellers sell them...
Stick with T5's I'd highly recommend ATI bulbs (blue plus and aqua blue) and KZ's fiji purple.
Look for a fixture with individual reflectors, the Tek fixture by sunlight supply is a good choice... if you're willing to spend a bit more the ATI powermodule and Sfiligoi stealth are also good choices.
HTH. |