For those of you who are wondering, I par tested my tank. These are strong.
Lights hung 14" above the waterline, running 4, 48s over my 8' tank
Ch 3,5,6 100% and others at 50%
roughly 6" from the water, top of the rocks, I was getting 600+ PAR
at the sandbed, 37" down I was averaging 300+ par.
The corners saw about 200+ par.
I got the best growth and coloration down low.
I left it like that for months and some stuff struggled up high. I borrowed a par meter again, had to take them down ALOT to get 400-450 par at the top of the rocks, 200-250 at the sand bed and about 120+ in the corners.
now running 3/5/6 at 70% and others at 18% where they'll stay,