I use an undercabinet type 18" flourescent fixture with a growlight bulb in it on my refugium. I got it at Home Depot in the lighting section for about $20 plus $5 for the growlight bulb. I leave the opaque plastic lens off and it sits right on top of the eggcrate nice and close to the water surface. Seems to make the macroalgae grow just fine.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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