Depends on the space in which you are growing I guess, they say the rule of thumb is 60-80watts per plant. I run 5 27watt 5000k cfls for my veg (I'm switching to 6500k when I get more money lol) thats for 2 plants. They have higher what cfls, 1001bulbs.com or something like that have lots of cfls. But if your tight on money, most lowes, home depot, and menards all have 26w-27w cfls both daylight (6500k - veg) and soft white (2700k - flower - I think its called soft white). Hope this helps you some, I'm still very new to growing myself.