Manufacturer specs the bulbs for 4500 hrs. At 8 hrs/day, that's 562 days. Personally, I like to swap them at no more than 1 year.
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-Mark
29 Gal Bowfront w/24" LED Lights. DIY HOB Sump (5.4 Gal) MP40. Orange Spotted Watchman Goby, 2 Clownfish and a few hermits.
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