T8's lower light output over time with no use?
Do T8 bulbs loose light output over time even if they are not in use?
I dug out some old T8's recently and they look awfully dim, though they haven't been used even once IIRC.
I've never read of this happening. All fluorescent tubes decrease their intensity as they burn, because the phosphors inside the tube are literally burning. But without being on,...
Perhaps you used the tubes in the past longer than you remember. The intensity diminishes considerably after only three months of daily use, and after that it's a steady decline in intensity. Some authors suggest replacing tubes every six months, but as this is expensive, they recommend 12 months but alternating so one tube is replaced every six months to maintain a better intensity long-term.
Not all T-8 tubes are the same. Some are 32watts and others are 40. If the bulb has a Lumens rating that may help. Most T-8's these days are rated around 2700-3000 for 32 watts and 3400-3600 for 40 watts. But I agree with Byron. They only wear out with use.
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