There a few things that I consider critical when I enter the backcountry even on a day hike. Fire, water, shelter, and light. I will not skimp on these as they could save your life. To satisfy the light part, I always carry a reliable flashlight when I dayhike. If going over night, I will also bring a headlamp.
I decided on an HDS flashlight as they are often used by spelunkers who must rely on their flashlight in dark, wet caves. They are costly but will be there and work whenever they are called upon. Multiple lumen settings with a click and it will last 30 hours at 9 lumens which is way more light than I would ever need to extract myself. It is with me whenever I go out in the woods.
They are legendary for taking abuse. Being shot at with a firearm, being dropped from from 30' for two hours, hurled repeated against concrete, etc,. If you absolutely, positively, have to have light, HDS is my advice.
Check out the abuse part of the video starting at 5:01. Also note they remove and put in a new battery all while being underwater and it starts immediately without a hitch.
https://www.hdssystems.com/