from hypertherm
Less than 40 amps.......shade 5
41-60 amps..................shade 6
61-300 amps................shade 8
I have a 40amp plasma, I use my speedglas 9000x auto darkening helmet with it turned off (shade 5).... A silver sharpie works great for marking for plasma cutting..
Thanks for that info, I'm after some goggles myself.