Need opinions from the veterans

[Myka]

I'd try to find a 8-bulb dimmable ATI fixture if the cost doesn't scare you away. That would be my number one choice...then you could dim the bulbs but still get coverage over the 24" width. If that isn't feasible I'd go with (2) 2-bulb AquaticLife fixtures and mount them with a gap between. You'd get enough output from these for the LPS but you'd need two fixtures for the coverage. Much cheaper option.