That’s a very interesting take on white LEDs. The general consensus as far as I’m aware is that white ‘daylight’ LEDs offer major benefits because our eyes are naturally attuned to pick out things illuminated by daylight. The LEDs in car headlamps are designed to emit at 445-475nm. It is a blue light that is emitted by the diode and a phosphor coating makes it emit white light. The lenses on the LED headlamps cause small amounts of blue light to be visible.
The new laser headlamps are even more tightly defined and I believe the Osram laser diodes fitted to BMWs, Audis and Range Rovers is a 460nm emitter and they are staggeringly good to drive with.
So we definitely see better with whiter, more daylight like light.
If it makes the eye more tired then that’s not so good. Having had LEDs on my last 3 cars I wouldn’t go back to halogens now. It was actually the main reason I picked my Kona over the eNiro as at the time the eNiro wasn’t available with LED headlamps.
I don't think the idea that the blue content of white LED light can be tiring is particularly new, this abstract from a study published in 2013 indicates the same conclusion :
"This study evaluated the effect of short-wavelength content of headlamps on discomfort glare, in order to provide guidance regarding spectral compositions that would minimize driver complaints. Three light-emitting diode (LED) headlamps were tested (with correlated color temperatures of 4000, 4800, and 6600 K), as well as a tungsten-halogen headlamp and a high-intensity discharge (HID) headlamp. Subjects, seated in a stationary vehicle, rated discomfort from brief presentations of stimuli that produced illuminances of 0.25, 0.5, and 1 lx. As predicted in our previous analytical study, we found that—when they appear bluer than current tungsten-halogen or HID headlamps—LED headlamps tend to produce more discomfort glare. The effect is probably due to the color appearance of the LED lamps used in this study rather than to any inherent characteristic of LED sources, and it could probably be altered or reversed with different sources. For the data reported here, ratings of discomfort glare were linearly related to the amount of short-wavelength content in the light output as weighted by the spectral sensitivity of the short-wavelength cone photoreceptors. Thus, the present study provides support for the hypothesis that the short-wavelength content of the headlamp output could be used heuristically to select colors of headlamps to minimize driver complaints about glare."
From
Short-Wavelength Content of LED Headlamps and Discomfort Glare | Request PDF