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120 gallon
I guess that's a 4x2x2?
What's the highest intensity you running now and for how low?
If you running WA lenses and they are 7" or more above tank you will get light spill.
With the standard TIR lenses on 12" you have plenty of spread when it hits the rocks and corals.
You always will have on the underside of the corals no PE, especially with SPS even the WA lenses are not going to change that.
I have 5 PRO's with the TIR, we did ran a test a while back for ECOtech on the WA but I removed the WA lenses as I had to much light spill, my lights are 15" above water level.

