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What's the suggested time frame to replace T5 actinic & full spectrum bulbs? They become less effective over time, correct?
 

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one year is average. 10 months is probably a little better.

6-8 months for UV sterilizers.
 

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MH are generally suggested on a ~1yr replacement schedule...T5's however are generally good for ~18mos if powered at the recommened wattage (I.E. not over-driven).
 
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