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I do 2x13W 6700k CFL's over my 10gals no problem, grows things fine, not too much to make algae. They work nice in the 10gal hoods.

what I did was take some that aluminum foil tape and taped all behind the lights, to A, protect the plastic a bit from the small heat CFL's do give off, and create a bit of a reflector in there, to at least bounce some of the light back. May not be super effective but even only bouncing back 20% light is still 20% more light. I took my time and applied the foil tape straight so it wasn't crumpled anywhere and gives a decent reflection.
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