I use plural here because you can never have enough light. I like to bring a good, reliable flashlight as well as a headlamp on all my camping adventures. A headlamp allows you to have hands-free light, which makes working on bikes, digging through saddlebags, and blinding your buddies while you BS with them that much easier. It's also important to bring extra batteries, just in case you pass out with the light on. It's never happened to me. Maybe.