I think most autodimming helmets react in 100 microseconds or less, mine does and it's not a fancy one at all. After years of struggling trying to get somewhere under a car and then see where your wire is, I'm not giving up my autodimmer. I wear sunglasses and safety glasses religiously to protect my sight, but I figure with the response rate of these helmets I'd have to continue welding for many years to reach the UV exposure I'd get on one afternoon on the beach if I'd forgotten my sunglasses

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.