150watt hps grow box.

So grasscity i was thinking of stepping up to a HID light to get hopefully better buds. heres the design i was planning on, ohh also i was thinking of buying this 150watt hps http://www.shastahydroponics.com/ProductDetails.asp?ProductCode=Ugly-150 has anybody delt with this site/company? input would be helpful, im also gonna put it in my closet to keep it pretty hidden, and im gonna put board across to lower and higher the plants to the light to cut down on streaching. thanks in advance!