For me, with two fixtures and no lenses I was getting max of high 120s at mid-depth, 10" off the water. With lenses I'm getting about 100 more par at same depth and in low 400s at the highest point of aquascape. Unfortunately, coverage drops off very quickly away from center.
I have a 3rd viparspectra and I'm considering running 3 on my 120 48x24x24. If I can get the same par without lenses, I will do that as I much prefer the spread/coverage w/o lenses.
TLDR, w/o lenses on a 48x24x24 I don't think two fixtures would be enough for more than softies. With 3, I would guess (I have no data) that you could grow SPS just fine as they would produce plenty of light.
I have a 3rd viparspectra and I'm considering running 3 on my 120 48x24x24. If I can get the same par without lenses, I will do that as I much prefer the spread/coverage w/o lenses.
TLDR, w/o lenses on a 48x24x24 I don't think two fixtures would be enough for more than softies. With 3, I would guess (I have no data) that you could grow SPS just fine as they would produce plenty of light.