I’m partial to a more complete solution. These little flashlights can go up to 650 lumens, weigh almost nothing, and have a hat clip for use as a headlamp. They also have firefly mode which is less than 1 lumen, for use in reading or sorting through your stuff after bed time. They have decent battery life too when you’re not using the full brightness mode. I’m not trying to detract from your cool idea, just throwing more options out there.