I commonly use a lighter shade than most, but have filters for my (manual) hood that range from 8-14. For any TIG above about 25 amps, I use a 9. MIG I use a 9 for anything up to about 3/8" plate.
If you're seeing how light you can go, do this: Weld for atleast 5 minutes straight, stop, and look around. If you get the same effect as walking into a building from outside on a very bright day, then you're too light. See blue spots? Not good!
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