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
BeatlesTypeBeat t1_j7n6u8y wrote on February 8, 2023 at 12:27 AM Reply to comment by Thelgow in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23 Because it was new and cool! Permalink Parent 1
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