I'm using a new auto-darkening welding mask/helmet deal, and it just doesn't seem dark enough. The lens is spec'd as: Light state: Shade 4 Shade: Fixed at Shade 10.5 Ultraviolet/Infared: Protection to Shade 12 at all times Northern Tool specs for the helmet I'm doing MIG welding, using flux core wire without gas. When i flip the mask up, i see spots for a while, which never happened with the old non-auto darkening helmet i had. Does anyone have a suggestion of what shade to run for MIG? Any help is greatly appreciated!