IR is the culprit...
All that Chad has said is absolutely true -- that said, what I'd recommend is an inexpensive pair of welders clip on lenses. My supplier is on backorder right now, but I've got some expected in fairly soon. (Our part number is 7520.)
The clip on's will work just fine - however, be aware that they do fade over time and exposure to IR - usually about 6 months is the time to replace them.
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