I worked my way up to a 1000k. I started with CFL's then my brother-in-law saw what I was doing and how well it was going so he gave me an old crappy 400w ballast, used bulb and and air cooled hood w/blower fan. The ballast crapped out so I bought a nice 400w and with that and the old bulb I grew a harvest that paid for my 1000k set-up. You will need to think about your grow space and how you will keep it cool, secret, etc. You may find that you will have to spend at a minimum of $1000 to set up a decent sized 1000w grow. You can get good deals here and there but it is still very expensive to start out. Good luck.