That's a big ass light, friend! what is that, like 8 ft long?
you'd probably be better off buying a smaller T5. I can't rightly tell the light output from the photos. I usually try to give the little ones about 8000 lumens while they veg initially. after about 4 weeks though I want them under at least 750W Metal Halide. tens of thousands of lumens with those babies.
If you intend to grow Vertically however, this light might be a real winner. Check out the vert forums. the length of the light might be a good thing.I've only just started reading about Vert techniques so tke what I give you in this regard with a gran of salt.. for short squat grows though this will work for a while in early veg, but not for very long.
you can veg under that for a while but id get something better for flower or your end product will suck. i wouldnt do it. return that thing if your plan was to grow anything more than clones or vegetable seed starts under it.
not to flower. 4 ft, 2 bulb t8s will accommodate two seed trays under them. so if you want to run 150 clones under there it would be good, or like i said, start your vegetable garden under it which i do recommend.
I've run six bulb t8 4 ft lights and had plants veg nicely to three and a half feet and bushy, but those floro tubes just don't have the penetration that hid lighting provides for flowering. two low riders, 400 w hps. theres no rule that says you can't veg under an hps just because the spectrums not perfect. I'm vegging under them right now just because i ran out of room under my 4 ft 6 bulb t5 hos.
the problem with buyng a light that you think might just cut it is that you usually have to buy twice. i started small too, leds, t8s, floro pig tails, 600s. if you have the space just bite the bullet and get a double ended 1000w and giver. if not get whatever the footprint you want to cover will handle. 4x4 for a 600w, and 5x5 for a 1000w.