Aim for 4000 lumens minimal per square foot so I'd say if it grows 3 foot by 3 foot that's 3x3 =9 then 9x 4000 =36000 lumens so if u buy the small cfl bulbs at 6000 lumens you would need 6 bulbs around the plant, I could be wrong but I'm only trying to help.
Those 14 watt led's are barely enough to get clones going, even then it struggles. I have a couple of them that I use for seedlings. I bought them before I knew what I needed. I would get a 400w hps/mh miminum. That way you will have excellent light penetration. If you are dead set on LED's Mars II led's are pretty good for the money. If on a budget and dont mind used, check Craigslist.