Going to guess you also ride FJR ?
If not in my Arai Corsair X, I wear Shoei X14. The RF12 and X14 use the same visor, just my 14 visor has tearoff posts needed for my track duties plus the cool vortex generators. I only use the dark smoke on the X14.
Even on cloudy days or getting caught in a thunderstorm or starting or ending the ride at before dawn or dusk, I personally have never struggled or had issues with the dark smoke.
But even riding well into the night and not taking the minute to swap to clear, I just open the visor and adjust the FJR windscreen to manage the airflow.
I did try a light smoke and ended up squinting too much and getting that type of headache.
Went so far as to spend too much on the transition shield and for me, it never got dark enuff. So I now just roll with the dark smoke and carry a clear in the saddlebag.
And I strongly suggest staying with the genuine Shoei brand visors and not the cheaper copies. The cheap ones fit (barely) but distortion is terrible on the ones I've sampled plus they scratch way too easily.
Your results may vary and professional rider on closed course......
ʎɐqǝ uo pɹɐoqʎǝʞ ɐ ʎnq ı ǝɯıʇ ʇsɐן ǝɥʇ sı sıɥʇ
2013 Stone Grey