Yes, I had intermittently noticed that as well, and worried whether it was developing hardware issue, but then it went away again. I might have changed the brightness, not sure. Or maybe my eyes are just more sensitive some times than at others. I have also heard of this being a general issue with LED lighting at low levels. Though that begs the question, since any brightness settings above 70% seem (to me) pointless on the Glo, why not use lower powered LED to begin with (and possibly save battery as well).
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