I am leaning toward 3 or 4 Mars aqua.
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The Mars lights will do in a pinch, but they are very limited on capabilities. No real way to set individual channels, or ramp up/down profiles. You have two dials one for the blues and one for the W,R,G channel and that's about it. They will grow coral, but their lack of control-ability hinders them. Not to mention the light dispersal on these isn't all that great. They create a very narrow beam almost like a laser of sorts where you have a very bad hot spot directly under them, but the light intensity falls off very quickly as you move just a few inches away. And to get a decent light coverage across the entire sand bed you need to mount them at least 12" or more above the waterline.
I got the Par readings on the ReefBreeders Photon V2+. The light is currently mounted 8.5" above the waterline on the supplied light stand, power output set at 45% on the UV, Royal, and Atinic blue, 17% on white, and 9% on Red and 6% Green they are as follows.
On the sand bed of the at 20" depth I'm getting 125 Par directly under the light across the entire length.
At 5" off center towards the front on sand bed the numbers fall to 95-105 Par across the length of the tank.
Along the back the readings at 5" from center the readings were 75 Par across the length of the tank.
At the front next to the glass I was getting 75-80 PAR with 65 in the very corners and 65-70 across the back and 45 in the back corners. The back glass is painted black so the PAR readings tends to be lower.
At the top of the rockwork 2/3 up on both right and left sides about 6" from the surface I am getting 180-200 Par from left side to the right since the right side is a couple inches higher.
Moving to the front 5" the PAR reading fell slightly to 160-180 across the length of the tank.
Moving to the back 5" the PAR reading match the front.
Against the glass 6" down from the surface the PAR readings fell to 90 in the front and 70 in the back.
Overall the PAR readings were fairly consistent across the tank at any given depth I tested with a slight fall off at the ends of the tank, but this is the same as most LED lighting systems on the market.
