If the corals are still just as colorful, growing and no algae problems then I don't see the need to change a bulb at a fixed interval just because somebody says I have to. Every bulbs life is going to be different based on mfg, hour usage, temperature control, brand of fixture they're in, etc. This were I don't agree with LED mfg's using short bulb life of non-led's to help justify their high prices in their marketing schemes showing how much money you will save every year on bulb changes.
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