That would be my recommendation too. Lighting the 3' section of the sump may just lead to nuisance algae growth on that side. Of course, if you plan to use the sump as a frag tank, then go for it. Otherwise, one or two 2' light strips would do for your refugium & then you could leave the light on 24/7.
Just my $.02,
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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