If you look at 460-470 nm where the spike is in the LED spectrum, it's much lower in the blue sky spectrum.
I think the concern is something about the relative amounts of blue light. Not sure what exactly but something like, the human perception of brightness and therefore the self protection of the eye is calibrated for natural light, so the pupil contraction, looking away, etc, is not done correctly in with that unnatural distribution. Anyway I don't know if that's a real effect, but that's what people (should) mean when they're talking about "too much blue".
https://en.wikipedia.org/wiki/Diffuse_sky_radiation#/media/F...
If you look at 460-470 nm where the spike is in the LED spectrum, it's much lower in the blue sky spectrum.
I think the concern is something about the relative amounts of blue light. Not sure what exactly but something like, the human perception of brightness and therefore the self protection of the eye is calibrated for natural light, so the pupil contraction, looking away, etc, is not done correctly in with that unnatural distribution. Anyway I don't know if that's a real effect, but that's what people (should) mean when they're talking about "too much blue".