Marking the installation date on the bulbs with a felt tip marker would be an easy way to determine which bulbs are the oldest.
The cost of LED fixtures will continue to drop. If you already have 50 new florescent bulbs that you need to use up, I totally agree with installing four new bulbs every time you go up the tall ladder to work on a fixture. If you have some lower fixtures you could play around with the old bulbs to get some additional life out of them, but florescent bulbs do seem to get dimmer as they age. If you don't have any lower fixtures, I'd toss the old bulbs, especially any with black rings around the ends.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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