Hi Mike, I hiked last year on a full moon and it kind of depends where you are on the trail and the time you leave. I started at 3:00 A.M in early September. I needed the headlamp for the first three miles or so. But once I got to the logs that cross the creek before Lone Pine Lake, I turned my lamp off for a few minutes to just ingest the wonder of the full moon, the illumination against the granite peaks and the wonderful shadows coming through the trees. For the next mile or so, I just kept playing with the lamp and turning it off from time to time. If you are hiking during a full moon, just make sure you're on stable ground and enjoy the beauty of the Sierra's at night. I cannot express how beautiful it was.
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