go to WalMart and buy yourself some CFLs ... until you are acclimated, and know how deeply you want to get into growing, avoid the HPS and MH lights ... without proper knowledge, and maintenance, you can burn your house down ... you will have enough to learn about growing without worrying about the ventilation and cooling requirements of the big lamps ... I personally have grown since 1976, and still only use a large bank of flourescents ... I don't get the huge yields I could have with the sodiums, but I also have none of the worry or hassle ... and since I can legally grow only 6 plants at a time, I go for Quality, not Quantity ... :rasta: