Riding the trails late at night without lights is actually pretty neat. Especially if there is a full moon and a clear sky.
We used to go night riding on mountain bikes with a full moon when I was in Colorado. Since most of the trails were out in the open, visibility was pretty good. It was a cool way to ride.
I have one of those cheapo Bike Arlington dual-led dealies that i keep on my handlebars for when my main light inevitably fails due to the malevolent charging spirits (i.e. when I forget to plug it in).
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