Not to add to more confusion, but I too purchased the XR15's, but paired it with AI Grow blades on my Waterbox 230.6
I'm currently running 3x XR15 & 2 AI Grow blades. The major benefit i see is the light dispersant as i can angle the blades for broader distribution under corals & rock work. With AI @60% and Radions at 80% i'm getting 350 at the top of the rockscape, 1-170 on the sandbed. Closer to the rocks, you'll get around 100 PAR, as i move to the edge and closer to the glass, i get 170-180.
I'm currently running 3x XR15 & 2 AI Grow blades. The major benefit i see is the light dispersant as i can angle the blades for broader distribution under corals & rock work. With AI @60% and Radions at 80% i'm getting 350 at the top of the rockscape, 1-170 on the sandbed. Closer to the rocks, you'll get around 100 PAR, as i move to the edge and closer to the glass, i get 170-180.

