I have a 120*50*50 tank - please see my build thread. I run mitras lightbar 2. I use two 120 deep actinic, one 120 actinic and on 120 deep blue. Total around 300 W. I have a mixed reef. I have grown 4 clams from around 6 cm to around 20-25 cm in this tank and mostly with this light.
Here is mine on full blast. I use nastural white (4500 K) as moonlight - hence it zero here.
The lightbar 3 comes with a little higher wattage compared with lightbar 2.
I would recommend at least three lightbar 3 in the start. If it was lightbar 2 - I had recommend 2 deep actinic and 1 actinic. The RGB Leds make it possible to get a rather white appearance in spite of the fact that this combination is heavy, heavy blue. However the RGB Leds of Lightbar 2 is 4 in every module compared with only 2 of the lightbar 3.
It gives this spectrum (LB 2 - 2 deep actinic - 1 actinic
Compared with LB 3 1 coral pop 2 deep Ocean
LB3 1 Coral pop, 1 deep Ocean and 1 Ocean blue
Its difficult to recommend because its lesser RGB in LB 3 and the RGB is the secret of LB 2:s whitish aperance even with mostly deep actinic.
If you have P4 and GCC - you can go to Light composer - chose empty and press OK
Highlight an combination - press arrow - if two (or more) of the sam sort press multiple times on the arrow. Press OK
Here chose + and 100 % on all and you get the spectra. You can play with the slide bars and at which time i should be active
You can play with this and get a theoretical spectra through the day - but how it looks in real life - you have to test.
If you start with LB3 1 colour pop, 1 deep ocean and 1 ocean blue - you get a spectra most like mine.
BuY a PSU that manage 4 LB 3, a splitter needs for both 3 an 4 bars
Sincerely Lasse