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
sysable t1_j7lu94h wrote on February 7, 2023 at 7:05 PM They were extremely expensive when they first became available. The blue LED power indicator in a preamp added $200.00 to the cost (including markup) according to the design engineer. Permalink 1
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