[Ron Reefman]

Is this for a display refugium, a sump based refugium or a regular display tank?

I don't think macro algae has the kind of powerful light requirements that corals do, so that fixture probably would work (but that's the opinion of somebody who has very little experience with them). On the other hand, for a refugium, do you need the kind of control that fixture offers? Why not look at a black box led grow light for about $100. Or an led grow light from Lowes with a cheap fixture, mine cost about $35.