get a 250 watt Mh or Hps, it's meant to cover exactly 2x2 so you got it perfect, a 400 mite cook them, get a fan in their. you can grow under fluoros, but i would still recomend mh or hps. I don't think it makes a huge difference between mh and hps, some say Hps some say MH. dont feed when really young, after a week or two after germination start with low strength ferts and gradually build up as it grows. If you live in USA you can get a light from www.insidesun.com for really cheap. I saw an advert for a 250HPS only $85 or somethin. When buyig a light look at the watts not the length