would four t-8 or t-12 flouros be enough to veg for a mother plant

i want to start a perpetual grow. but to do so i know that i need at least 2 or 3 mother plants.i have 2 400wt hps lights for flowering and i built a grow cabinet for the mothers and clones. i am currently in the middle of flowering some plants and i wanted to use the cabinet on a 24 hr basis,but im worried about heat that's why i'm leaning towards the flouros. so hears my question:Would four t-8 or t-12 4ft tubes be enough to grow some mother plants, if so which is better the 8's or the 12's. i know that either would be enough for the clones, i'm just curios about whether they would be enough to grow a healthy strong plant or plants.


grow cabinet is 4ftx3ftx6ft