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-I've heard that for max. efficiency u shud change them every 10 months
but then u absolutely have 2 take into consideration lighting schedule, for me it's only 5-7 hours a day, but if u have sps corals then ur probably @ about
8+ hours/day so that cud reduce the bulbs span 2 only 6-8 months-mind you bigger bulbs (in wattage) tend to last longer, so good luck with that-
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