a non-diffused, bright, monocromatic red led would still be painful to look at in the dark, it’s just that blue LEDs tend to be brighter + our eyes are more sensitive to blueish green light at night + the damn companies don’t bother putting a diffuser in front of the diode.
Shorter wavelengths hit different though. That’s why we have blue light filtering glasses, Redshift, etc.
a non-diffused, bright, monocromatic red led would still be painful to look at in the dark, it’s just that blue LEDs tend to be brighter + our eyes are more sensitive to blueish green light at night + the damn companies don’t bother putting a diffuser in front of the diode.
Diffusion and overall brightness do make a difference as well.