Suggestions for DIY refugium grow lights

I've seen plenty of Aquarists using Flood lights as a Refugium plant growing light. Is that the best route? cost wise and quality? Would anyone give me some tips on effective ways to build? I was going to buy a LED kessil amazon sun light but im thinking it may be over kill for a cpr HOB Refugium. Im planning on adding more mangroves and Chaeto.

I found a zoomed compact fluorescent UVB light originally for my lizard. would this work just as good?
 

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