Changing bulbs

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What kind of bulb?? PC I am guessing from the watts..... they say 12-16 months from what Ive read. Reef or FO tank. Fish tank then lighting is not that big of a deal and u can run them longer.
I change mine out every 9 months when it comes to PC bulbs. I have found the specitrum and intensity drops off around the 7-8 month timeframe. Going a full year can be a detriment to my corals.
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