On Thu, 3 Oct 2019 17:33:19 +0100, Martin Brownnoser, another troll-feeding,
senile idiot, blathered:


There was a prehistoric dim blue LED based on silicon carbide used as
indicators in a handful of expensive 1970's power amplifiers. They were
very dim even by the dim standards of LEDs of that era, but blue.

They couldn't possibly have been as dim as you two blithering idiots!