I think I found the fixture
you are looking at.
It makes no mention of what brand 15k MH
or T5 actinic bulbs come with it. I would suggest you replace the bulbs within 3 - 6 months.
Next, it does not state the T5s have highly polished, individual, parabolic reflectors. It is that type of reflector that gives T5 bulbs the advantage. Without individual, parabolic reflectors over each bulb, you will not get the light output you need.
Lastly, these are CE not UL certified. CE is the European equivalent of UL, but leads me to believe this is a Chinese made knock off.
Oh, just noticed the "No guarantees and no insurance coverage on Free Items.", and no mention of any warranty on the fixture or ballasts.