Properly adjusted projector lights have a sharp cutoff that will not blind drivers ahead. Problem is that differences in load will misalign the lights, which I assume is why some cars have self leveling lights.
Reflector bulbs tend to scatter light everywhere, so some blinding of drivers ahead will occur.
Speaking of all this, I probably need to lower the projectors slightly on the Mazda since I never adjusted them after installing the hitch.
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