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Yes, I agree with the notion that it depends on the magnification being used.
For low magnification I use a pair of polarizing filters. By twisting one against the other it is possible to regulate the amount of light. This the only way I am able to sketch the full Moon with an 8" scope.
Now when exploring the terminator, you are using high magnification, and then no filter is necessary. I never use a filter when pushing 200X and over.
Don't forget, when you are looking at the Moon, forget dark adaptation! There is nothing subtle about the Moon. Your eyes will be stunned like coming inside from a sunny day. You DON'T need a feeble red light. On the contrary, just use whatever white light you have, as this will actually make things safer and easier for you. When sketching the Moon, I leave the porch light on and I use a bright white headlight to illuminate my paper - your eye is stunned looking at the brilliant Moon, so it is just dumb trying to use a dim red light to shine your paper... or your way around if you are not sketching.
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