Ambient light is easy to create from the basic supplies you’ll already have with you on a camping trip.
Attach your headlamp to a jug full of water. (You don’t have to carry a gallon of water with you–drink up and collapse the empty bottle, then stick it in your backpack, and fill it up at a stream.) Shine the lamp through the water and you’ll have just the right amount of light for a late-night talk, snack, or… whatever you fancy.
Bring a few extra batteries for the headlamp. This is so much more effective than a cell phone lamp app, and definitely safer than a candle!