Last weekend our bike club had permission to do a night ride on The Tunnel Hill Road (Rails to Trails). Unfortunely it was in the low 50s and only 4 people beside me showed up and they all were wearing shorts. The club Pres and his wife said they were too cold and that their Trek double C light wasn't bright enough so they weren't riding. The other two were man and wife and he had 2 Trek lights on his bike and she had 1 Trek on hers. We got about 5 miles into a 20 mile round trip when we noticed her light was out. We stopped and he fiddled with it a while and next thing we knew one of his lights went out. He messed with that one awhile and 'poof' his 2nd light went out. He'd get one working and another would go out until all 3 were dead. Fairly new lights with new batteries he said and they were not dim when they came on. Strangest thing I ever seen. He had a old generator light and she rode beside me and we high tailed it home before something else went wrong. Bad night for Treks?