If you can get by with using a small flashlight then this is a good philosophy to know:
Light discipline can be minimal and one
does not get to demanding on power because it is the same thing with a SAK. If you can use a small blade without damaging it then you know correct use.
LED rescue update
A small LED flashlight can be used in many different situations and for rescue. A small LED can be attached to a life vest or it can be used on a rope.
In a situation in the dark with rope then it is possible to attach one on the rope to mark it. If you throw a rope in the water then It can be difficult for a person in the water to see the rope even if you have a flashlight in your hand pointing.
A “tactical stick” device can also be used in water and as a helpful tool on the ice. A tactical stick can be used for medical uses. It is a long list.