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
SeraxOfTolos t1_j7lmiix wrote on February 7, 2023 at 6:14 PM Blue light was so rare, we didn't have glasses Permalink 0
Viewing a single comment thread. View all comments