Portable lighting is a thing. Cars have lights on them. I carry a flashlight when I go out at night. The light I carry is under 1x4" in size and can provide en

Portable lighting is a thing. Cars have lights on them. I carry a flashlight when I go out at night. The light I carry is under 1x4" in size and can provide enough light to see well enough to walk comfortably and to be seen by cars (70 lumens) for 15 hours on a single charge of its rechargeable battery. Should I want more light, it can match the output of a car headlight (1000 lumens) for an hour. Lights with this kind of performance can be had for $15, plus another $10 or so for the battery and charger. It's not a binary choice between life in the dark and illuminating a bunch of mostly-unused space.