i use 150w hps in 2x4x5 tall.3 weeks in. 60%top soil and 40%manure.about to start feeding them with recipe for success i found on amazon.here are some pics.good luck.http://www.amazon.com/Recipe-Success-Starter-Fertilizer-Kit/dp/B0001XGP32/ref=sr_1_1?ie=UTF8&qid=1306200512&sr=8-1