1) Leds as stated have a narrow frontal area of illumination, which makes them ideal as indicator lights on electrical equipment. The lateral output is zilch, which is what we need for the dashboard illumination. This same problem occurs when you try to convert the Technics sl1200 turntable illumination. the fix here is to use very small blue leds mounted at 90degs on a small sub circuit board. Might need major surgery to illuminate from behind the dials.
About 25 years ago I used a blue plastic perspex filter on my Vx Royale with limited results.
2)Blue is the worst color for an instrument panel. Red (and green) allow the eyes the re-focus more quickly when looking alternately from distance to near, and back to distance. Notice how "fuzzy" the blue can appear on VW's.
Ask why no other manufacturer uses blue.
Now why do you think that is.
?
3) HU's used to have alternate color illuminations. Denon did this years ago.
Blue was cool. agree now a bit "gay"
is white the new blue?