First off the lens of the helmet should filter the UV rays even when full open, you just get blinded by the light. That's the way it's supposed to work anyway. I had an HF helmet and with TIG it would always flash so I took it back. I traded for the next price up and had no more problems. I also have a Longevity helmet and I never get flashes with that.
Units owned
Longevity WeldPro LS200PI (IGBT)
Force Cut LP80 plasma cutter
Longevity auto dark welding helmet
Atlas 10x36" lathe
Craftsman 5HP 30 Gal compressor
Home made CNC router/plasma/hot wire foam cutting table powered by Longevity Force Cut LP80
Home built aluminum foundry, HF 4x6 bandsaw, O/A torch
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