I am about to set up a small frag tank, for sps corals. The corals are gonna be under 20cm of water (more or less), and the measure ments is 45x32cm, how many lightbars would be needed to grow sps there?

i was thinking about getting 2x Mitras Lightbar Actinic as they have a kelvin at about 14k. Would that be enought or?