Need Advice

As far as info the seeds were from a mid grade a friend got and gave me the seeds I started the plants in a large pot using a porting mix along with paralite they are about 4 weeks old nutes I'm using is all purpose liquid food nitrogen 8 phosphate 7 and potash 6 I use that in a spray 1-2 times w week and water them only when dry using water with a ph of 6.4 I jus moved them today in their own individual pots they have been kept at 70 degree temp and steady light not sure when I start the flowering but I'm sure its not time yet

I use an 8 bulb t5 reflector similar to the one you linked to for seedling/early veg and a 600w hps that I just bought for bloom (growing autoflower so veg is a very short stage) and I love the combination. I'm in a homebox XXL and the dimension are comparable with the size of your closet (I can look it up if you want exact numbers).

edit:Well, someone linked to it.

you need to invest in a good ballast and light system, these are the cheapest i have seen

http://www.htgsupply.com/

and also plan on drilling an exhaust in tho roof if possible it all really depends what is in the surrounding walls of that closet

if money is no problem, then go to your local hydro shop and ask questions
and if you dont know anythign at all about growing then maybe this isnt a game you should play