Nothing is so gratifying as helping people see the light.
It is important to see and be seen in the wilderness. The access to light can mean recovery from underestimating the length or difficulty of a trail and facilitate getting back to the car after “last light”. It can add comfort and psychological warmth to being stuck out overnight. It can illuminate a wound so that first aid can be administered. In a rescue situation the light can guide Search and Rescue to you. Having a light includes light from a fire. That is light and warmth. In short, when something goes wrong, it is nice to have light.
Most of us prefer to use headlamps so that we can work with both hands free. The downside to them is that if you want to talk to someone and look at their face, it will temporarily blind them. Learn to move your head aside when talking to someone. Headlamps have increased in the amount of light they produce and give the user the option of using less than the maximum light. This can save battery life. Use the minimum necessary to accomplish a task and turn it off when not needed.
Headlamps are utilitarian but others can serve different purposes. If you are planning to be out overnight and need to study maps for the next day (or read a good novel) a lantern is convenient and spreads light all around the tent. If you are horse packing or have sherpa support, you might consider heavier, more durable lights that have longer battery life. Either a fire or a candle can provide light in emergency situations. They also add psychological light to difficult situations. But in these days of tinder dry forests and high winds both a fire or a flame can ignite a disaster. We recommend lighting a fire only as a last resort in an emergency.