Here is a link that explains the florescent light spectrum's:
Color and Mood : ENERGY STAR
P.S.
I don't know what your paying for the T5's to order them, but here I can get them at Home Depot and Lowe's. I forget which has the ones I was looking at, but a twin 4 foot long T5 light fixture sells for about $35, and that includes the
bulbs. But they have 2 and 3 foot fixtures as well. Also Wal-mart usually has even cheaper prices if you can find the fixtures you want. I was looking for twin 4 foot T8 fixtures and found them at Wal-mart for $10, I'm sure you could find T5 there too.