if you're in USA here`s a 150w HPS for 20 bucks.
http://www.e-conolight.com/Product/EProductDetail.asp?ProductFamilyID=7&FGNumber=E-MT6H151G
That thing`s going to put out a bit of heat so you`re going to need some fans to exhaust the hot air around the lamp. so you put the fan blowing out of...