Additional light needed??

So I'm worried I might have too little light for my grow. I'm growing 3 plants in a 4x4 tent. Currently they are under a California Light works 220 and they seem to be doing ok, see picture, this is 16 days after germination pop.
Just for grins because I was worried the CLW 220 wasn't gonna be enough, I just ordered 2 Kessil 150 purples, cuz I got them at a killer price $150 for both. Will this be enough light? My instinct tells me yes, but was says the rest of you?

I think you are borderline on light. 2 plants you are sufficient 3 is a little stretching it. I do three plants with 2 Kessil H350's and 3 H150's. You may want to add one or two of these for some added light cheap.
http://www.amazon.com/gp/aw/d/B002ZPEHZM/ref=mp_s_a_1_6?qid=1410906515&sr=8-6&pi=AC_SX110_SY165_QL70