It seems using a 'flash-light on a welding mask" is a new technique.
It also seems that people put their mask as close to the weld as possible 
as if there is a strange fascination with occularation (occular pleasure) rather than practical application.
It is also interesting that most welding masks trap gases, with a few actually providing powered ventilation.
I started welding last year, I choose to use glasses because I was concerned about having gases trapped and condensed in a mask. I use glasses because it’s easier to just glance over them than to snap the mask open or closed.
For more intense stuff I have a clear full head helmet.
I use lights when welding and after a quick study online for welding helmets with lights the only thing I did get was a lead within the hyperbaric welding universe.
I also did my first upside down weld recently…never thought that was possible.
I have yet to try out an automated dimming helmets, I doughnut like.
over all the welding tutorials I have gone over noOne has mentioned just melting metals together (ie throwing a bunch of melted nails in an arch).
Only up-state N.Y. (Broome county) mentions brazzing the metal as opposed to grinding it down.
And no-one has ever mentioned properly lighting a weld.
I mean sure, the ‘flame’ itself is the source of light…