I'm looking into some cost effective LEDs for a 40 gal tank (36"). Someone suggested the Zetlights LEDs, but I cannot find any substantial reviews on them. Has anyone used these, and if so, how did they do?
you can try the black box led. I think it's less than $100. I have hung one fixture over my 40B before and had good success, albeit there's some shadowing on the corners.