I had a farmer on my commute (mostly rural commute) who was out at his mailbox as I went by, call to me today, I pulled over to chat, and he had nothing but praise my MagicShine. He complained about "most cyclists must have a death wish, riding around with no lights and black clothes - it's impossible to see them sometimes." He said he saw me a half mile off - this was in the daylight, though it was getting towards evening (4PM) and was overcast. "Damn, that thing is bright." Then I said "this is on its lowest mode. Here's bright (click click click)." "Yeah, that will do the job" (as he turned his head away).
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Work: the 8 hours that separates bike rides.