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Brightness settings for my Glo:
0% Reading in good lighting.
10% Reading in total darkness.
20% Reading in poor lighting (indoors, overcast day, etc.)
30% Reading in fair lighting (outside, sunny day in the shade, etc.)
50% Finding my way from tent to camp toilet at night.
75% Lighting the room so everyone can read paper books during a power cut.
100% Signaling passing ships when lost at sea in heavy fog.
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