I followed Richards' advice and now the both the -5 & -7 lens, there doesn't seem to be a -6 available.
I've been using the -7 to weld 18ga without any strain or worrisome effects on my eyes. I haven't even tried the -5. I haven't done long periods of welding as yet, hopefully today I'll have fitted a new panel in place and will be able to spend a couple hours under the hood.
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oj higgins
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