Well, aeroponics is the most efficient way because it gives your plant oxygenated water and thats great, but as a beginner you are better off trying a soil grow first until you get the hang of it.....Oh and on the lights, HPS are the most efficient lighting for growth but a 1000W may be to overpowering for a closet, depending on the size. You would also def. want a ballast and some type of way to circulate fresh air in the closet because it could get really hot....I too have a closet project in about a 4x4 closet of some dank silver haze and i usually run a small oscillating fan for circulation, and temperature and humidty gage are a must, specially with the HPS heat....with my project i bought two 48in flourescent grow lights and grow flood lights from wal-mart ($20 for all three) and experimenting to see how they affect growth....But HPS def. is the way too go, a 400W will do you just fine prolly and if you could get some type of CO2 aeration that will also optimize yield....but they're plenty of ebooks out on the internet to help you....AND if you can get "High Times: Jorge Cervantes Ultimate Grow 1" that DVD is very good insight...should help out a lot if ya can get your hands on it....If ya want to know anymore, i have endless books on this that may help... :rasta: