i kept my blue gig for over a year under my constilation 7 bulb 48" unit on my five foot tank. more than enough light for anything. i grow clams on the sand in 24inches with this light. my nem was on the outside corner and stayed there for the whole time. only reason i got rid of it was i got sick of having to keep buying dimond gobys and then it ate my 3 year old pair of manderians and that was it.
so you will have no problem with that sunpower. you might find that it is too much light. they really are a very bright fixture.
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