On a small tank, for night-lighting, I'd just get common cheap "high brightness" LEDs in a 3mm or 5mm through-hole package. Don't screw around with true HP LEDs for something like that, you won't be happy. It would be like trying to drink a sip of water from a fire hose.
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Inconveniencing marine life since 1992
"It is my personal belief that reef aquaria should be thriving communities of biodiversity, representative of their wild counterparts, and not merely collections of pretty specimens growing on tidy clean rock shelves covered in purple coralline algae." (Eric Borneman)
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