04-30-2011, 12:19 PM
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Originally Posted by Byron
A T8 tube should be sufficient for a year, some say 2-3 years; I just replacee my T8's after about 21 months and noticed quite a difference.
I have never seen a difference without replacing the tube, it is usually gradual over time. Tubes loose a lot of intensity during the first few months, though I have never been able to notice this unless I replace the tube.
Thanks. I just came back from vacation so thats how i noticed it was dimmer....today is the first chance I had to actually work on it but no luck.....I'll let it be until I see any signs from my plants that they aren't getting sufficient lighting.