Dumguy1214 t1_j7o2c6y wrote
Reply to comment by mobugs in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
the blue led needed a phosphorus layer to get white
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they found out 2021 a led that does not need it
I use leds to grow weed
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