a closet would be better, but you still have to vent heat or leave the door open

go look at bghydrodotcom...peruse their site...look at all the lights and all the different hydro systems

and at the link you showed they are selling a 6 month supply of nutes for 35 bucks...You could purchase GH 3-part, and that would last a year or more at the rate you want to grow.

the site I told you about is a favorite of mine and they have everything. peace