wut the hell is a brick?I'd say at least 10 bricks.
My lamp takes both mh and hps bulbs if u cant use hps buy a full light spectrum daylight bulb that will fit in ur light socket or most desk lamps. The bulbs are relatively cheap and have a full colour spectrum light. I use that and led lights and focus the light on the bottom of my plants. So the bottom of my plants get some light. Good luck and i will keep an eye on ur grow might try a sog grow next year just so i can grow many different strains at once. I got loads of different seeds want to try them all at once.im using MH because that is all i have right now i know i need HPS but i dont have the money for it i didnt pay for these lights so thats what im using for now will hps create a higher potency also or just more weight?