ok I'm updating my experience here. I had 2- 2x4 tents with T5 8 bulb fixtures. Had a really nice mix of Red sun, 6500k, Floragrow(I think that's the name, but got at PetCo and a nice general red blend, Actinic blue, and 10k bulbs. and one of the german Purples. Looking at the cast of light on walls I tried to tune it very similar to my LED's so try to mimic the color as best as possible.
2 runs in each tent. Ok results, but after now switching to Area51 LED's in one of the 2x4 tents the results of the LED blow away the t5's. the LED's are also drawing less watts. Running two of the older AF100's ie 100x3w diodes with true draw of ~185w ea. or about 365-370 total. The T5 setup was drawing about 440w from what I recall. Where I can really tell is how nicely the nodes are stacking, and how much more even the canopy is and not as patchy as with the T5's. Buds are also looking way denser, and the T5 buds were a fair bit fluffy too. Not horrible, and if this was my only option or I spent more time refining the T5's they are a legit option, but the LED's are better IMO. Plus I had these as "extra" after upgrading my main flower room with new Area51 LEDs.
IMO the T5's are awesome veg lights and I'll use my spare bulbs and t5 fixtures for that from now on. I have the LED's I can use for all my flowering needs now. Makes me wonder what I'm missing with HID, but for me HID was not an option, or one I felt comfortable with anyway.