You don't always need a light. One of my great memories was fixing a flat on a back road in NE Olympia, WA in the early morning hours. I just had a lumotec headlight powered by a dynohub and a rear blinkie but there was a full moon in the Western sky, bright enough to cast a shadow & some coyotes were calling as they hunted the fields nearby. I pumped up & got my wheel back into place with no problems, then rode on in to work. With no moon, it would have taken a lot more time to change the tube. Don