Even a bank of flouro's is plenty to keep a mom vegging, I assume for taking cuttings. But unless you're after a 20+ plant grow 2 400's will do the job nicely while only jumping up the elec bill appx 80/mo during a 20/4 veg. I'm using 2 400's at the moment with 20-some plants in 1gal pots (soil) but still waiting on sex to show on 6 from starting a 36 plant grow. I currently have 15 females that have showed and I expect to end up with 18-20 f's before flowering. If you can, keep a 1kw hps around for flowering. They grow plenty fine under the 400's but you'll get a better end result using higher wattage during flowering.