that is correct, i had 10x xr15pros g5 over a 48x36 tank. at one point i had 12 xr15s just for fun.I'm slowly going to raise up the PAR, since I'm currently running these lights at only about 65%. I just don't want to bake my torches just yet.
EDIT: IIRC, he had XR15s (not XR30s) and G5s vs G6. I'd argue that 10x XR15s outpeform 4x XR30s, but the light spread is noticeably better on the G6s so it's probably not *too* bad once I bump it up a bit more after getting more acros.
Quantas are a pretty good option too. 6' bar is like $300i recommend 2 led bars, great coverage, helps with shadowing of sps and coral (later on), and par increase also nice coral pop. Good one is OR3 Blue bar from orphrek or reef bright. at price of one xr15 you get two OR3 Blue light bars (48inch bar $200/ 60inch $325)