I do not believe the gas itself will change the arc brightness much, if any at all, but if you need to change your amperage to weld quicker because of the gas i.e. more amps to weld overhead using Argon (because its heavier than air) then you would need a darker lens. its best to simply match your amps and shade. A shade 12 is fine for most arc unless you go over 300 amps.
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