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believe it or not, watts per gallon doesnt really exists. especially for halides. watts per gallon usually is a general rule of thumb for pc or vho systems where you want to get the most light possible. however, IMO anything other than halides is not your best bet for longevity of the corals. a coral that needs 15,000 lumens needs it whether its in a ten or a 300. i hope that helped
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