I have a blue lens with gold coating, shade 10. Marked "T 10 H" on the gold side.
I used it for a few days of tig welding, ~4hrs actual booth time a day. View is crystal clear, colors are very easy on my eyes. Thing makes NR232 look almost like a white led.
After some thinking I started reading and found what seems like conflicting info.
Some say blue lenses are strictly for O/A welding aluminum and some say they don't block the UV of an arc.
I see the old American Optical blue lenses are highly desired for welding with no mention in those threads of O/A al use only.
I asked the senior instructor at my welding school today and he said as long as its shade 10+ that's all that matters.
I didn't get sore using it but I'm still worried about long term damage.
Can somebody clarify this for me? Are the cobalt lenses for O/A different from the AO weld cool lenses? I don't think my blue lens is an AO but how do I know if this thing is safe for long term daily welding?