Here are a few points to consider: How fast can a lens darken compared to the speed of light? How much do you value your eyesight? These are good for tricky positions where you can't flip your helmet, like under a car or something but if you are doing a lot of welding, stay with a solid lens #11 with mirror finish. We had a bunch of auto helmets at the shop I worked at and they would give us fits if you didn't keep them in a room with the light on. They were the solar kind but guys would get flashed all the time with these. One time is too many!
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