im on my 2nd grow with t5 4ft 4 bulb setup
first harvest was what would be expectred for a first timer, it was good, i had maybe 4+ total oz off about 3 plants
my 2nd grow, i have more plants, sAme lights, but i added a 6 bulb 27w cfl setup at the end of my t5, and another 2ft 75w bulb attached to the t5 at other end
7 plants rocvking it and lloving it
if you plant to flower, get the dimmer bulbs, they appear to be orangeish in color when on, to my eyes.
they work great! dont let anybody tellyou something doesnt work, or work well until you do the research and testing yourself