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Even at fairly high PWM frequencies, strobing can be visible when either the eyes or the source are moving. Which, in a car, they are! You don't need to have exceptional vision. Just glancing from left to right can be enough to leave a confusing and distracting trail of multiple images on your retina.

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Motion must explain why I find these LCDs in my home office so offensive. Normally they're not a bother, but when my ceiling fan is on and I look at the lights (below the fan), I swear there is some strobing.

also, peripheral vision is more sensitive to movements/flicker than central vision.

Ford's marker lights are an example of this. The huge consistently illuminated panels are simply amazing. The huge light source is perfect for maximum visibility without presenting a blinding spot source like the majority of automotive lights.

But that practically singular investment in automotive optical engineering and innovation is let down by the low frequency PWM driver baling wired into the final design to cut cost by perhaps a dollar or two.

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