Cfl's (compact floresent light)are one of the cheapest ways to go if you are on a tight budget.When you go in to wal-mart they will say the lumens on it.Look for the ones with 2700 lumens or better.And depending on how many plants you got going is depending on how many cfl's you will need.During you veg. state you should keep the light on either 24/7 or 18 on and 6 off.Then during flowering you will set your lights at 12 on and 12 off.If you have any other questions,ask away.Hope this helps,Keep it GREEN:hubba: