T5 lights replace?!?

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Gietz

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I'm not sure when I bought my lights if day about 8 months ago :$. When should I change them out?  I've been noticing a change in my corals extension when white shut off and blues stay on.  Maybe time for a change?  How often do you all swap out your T5 lights?
 
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reeffreak

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ive read with workhorse ballst , bulbs need to be replaced every 6 months , now with the universal ballst once oer year .
IMO 1 per year should be good if there dieing out faster then that I would start putting a fan to cool the unit so your bulbs arent buring out like crazy .
 
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Gietz

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I've got a DIY fixture with the fan.  I've been reading 9-10 on other forums.  It seems to be only the blue lights :/.  Once the whites turn on every just shoots up. 
 
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