Hmmnn. Interesting personal variations. I tend to keep it at 17 or 18 in bright rooms to keep the white look. At 2-3 when my eyes are very dark adapted and at 6-8 when they are still not very dark adapted. Outside in full daylight (Florida very bright), sometimes I just turn the light off sometimes I have it at 18 to 20 if it is a bit overcast.
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