From what I have read, I plan to change mine around the 10-12 month mark. Totally necessary? Maybe not, but you will get the most from the lights that way I figure. Plus the price of bulbs arent too* bad. You could always do one at a time over say a month till they are all new.
HTH!
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60 Gallon rimless, internal Herbie overflow, ATI Powermodule, Eheim 1250, 2X Tunze 6055, Tunze ATO, Euroreef RS100, Profilux controller, TLF Reactor.
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