So everybody knows about the American Electric stuff and how it would turn purple. But I recall that being an issue well before American American Electric Autobahns did it. Those eBay LED floodlights that used to be very popular, parts of the diodes would would flake off and they would emit a purple color. Or a lot of Walmart stores at 1 point over the produce section had 8' indirect linear LED lights, I think they were made by either GE or Cree if I remember correctly and those would either shift to green or purple. Some of the early 3/5 mm LEDs in hand held Flash lights would also slowly shift to purple, but not as extreme as the other stuff memtioned. The city of Ann Arbor Michigan on their own poles also installed these LED lights which I have no clue what they are,those things also would shift to purple before the AEL ones.
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The future is scary, so I'm gonna hold on to the old stuff if I can. That's mainly why I collect these things.