THe best color / look for T5 is VERY subjective. MOST ppl have a 6-10 lamp T5 fixture so with mixing and matching that many lamps folks end up with a lot of different looks.
NOW.. are are t5 lamps created equal ? NO.
SOME ARE better (produce better PAR) than others
If you have corals you'll want to balance a good par reading with the look you want.
THE GRIM REEFER has a "famous" thread on RC that has helped me with this comparison. Here are par numbers for popular lamps.
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ATI
Sun Pro 357
Aquablue 336
Blue Plus 311
Actinic 137
D&D/Giesemann
Midday 325
Aquablue 324
Actinic Plus 264
Pure Actinic 157
UVL
Aqua sun 345
Actinic White 293
Super Actinic 210
AquaZ
Sun Pro 285
Ocean Pro 323
Blue Pro 266
Helios
Daylight 309
Super Blue 225
Current Sun Paq
Daylight 10K 272
Blue 252
GE Daylight 340
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Let me know if I can help out in any other way.
B