TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. en.wikipedia.org Submitted by j-merc23 t3_10w8qi9 on February 7, 2023 at 6:12 PM in todayilearned 69 comments 789
OccamsMallet t1_j7oanvo wrote on February 8, 2023 at 5:48 AM I remember buying blue LED Christmas lights back in the day ... they were so expensive but looked so cool. Now they are stuck in throw-away plastic signs. Permalink 1
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