Red was the first color for LEDs. Later, yellow and green followed. But blue took a long time to develop, and early blue LEDs were very expensive. So now, I think, it‘s a fashion thing. Because red and green LEDs look so „1990“, manufacturers put blue LEDs everywhere to scream „Look how modern I am!“.
(In Germany, it goes so far that electric cars have to have blue lights on the outside and everywhere on the dashboard so that everyone can be sure that, yes, this is innovative technology. That there‘s actually a reason to favor red in settings where it‘s important to protect one‘s night vision doesn‘t seem to matter.)
(In Germany, it goes so far that electric cars have to have blue lights on the outside and everywhere on the dashboard so that everyone can be sure that, yes, this is innovative technology. That there‘s actually a reason to favor red in settings where it‘s important to protect one‘s night vision doesn‘t seem to matter.)