Bro, this is very subjective, its depand on the type of headlight you are using and how high is the angle of your beam. Basically projection headlight with proper beam angle should be quite safe as its not too glaring.
Out of curiousity, I came across the discussion regarding ceramic coatings for downpipes and exhaust parts. This triggered a memory flashback where I once saw a random photograph of a ceramic coated rotor housing...