03-31-2011, 12:44 PM
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This is pushing it, but for those plants it may suffice, though the Frogbit is going to have difficulty. However, tubes do wear out fast. T12 is basically useless within a year and should be replaced at least every year though some have suggested every 6 months. However, T12 is being phased out, and the T8 tubes are more efficient and will last some say 2-3 years. You can't wait until they "burn out" as by then they would be useless, having lost so much light intensity as they burn.
T refers to the tube diameter, in eighths of an inch. So a T12 is 12/8 or 1.5 inches in diameter, a T8 is 8/8 or 1 inch. But the same tubes only in |T8. m Most manufacturers are now making tubes in T8 and not T12 anyway, since they are more efficient.
What is the brand of tube? I may have comments on this. And what is your fertilizer?