I'm an amateur with lighting but I typically am using 4X 10k 54 watt T5s with 2X 420 actinic blue 54 watt t5s on my 120 gal. For the past few weeks I have been running 3 of each and the coral seems to be doing well and I like the look of it so I may stick to this, I will probably get slower growth but the extension seems better and the colors are prettier of course. One really cool feature about LEDs is they can add more of a shimmer to the tank, I get this at night when my moon light blue LEDs are the only things burning.