I am reviving a thread if anyone cares to respond. I am wondering as well, does anyone know if the MonsterRay is at all beneficial for plants at a 18" depth, for ex. or is it just intended to enhance fish and invert colours and that's all. Because at 37w's for a 48" fixture, it seems like 25 PAR @18" is pretty low. Makes sense only if the fixture is the totally wrong spectrum for plant growth, I think. Has anyone figured things out for sure?