I would try the 8 setting if you are welding out in the sunlight.
The lens has uv protection so welding flash is near impossible.
However, prolonged exposure may cause damage, headaches are also possible.
Honestly i would try welding at night, with a bright light directed at the area you are welding.
I will try 8 and see if it helps. I just worry because I wear contacts I have had flash burn when I was in trade school it was awful I couldn't imagine it with contacts in.
