CFL's (compact flourescent lights) - Cheapest way

you should by 2-3 30 watt daylight bulbs (CFL) for vegging

and 2-3 40 watt Soft/or Warm bulbs for flowering

thats what im goin with, and it will cost you less then 100 dollars

Goodluck

Edit: I joined up 10 days ago and have learned so much its unbeleivable, when you have the freetime just read up all the threads that can relate to your size of grow in general then you will kno exactly what your looking for, just go from page to page:thumbsup: