Do you carry a flashlight with you all the time? If so, what do you carry?
No, I prefer to be in the dark. Literally and figuratively. Or rely on my phone, which fuels my super-human night vision that most people don't have. The "light" on the phone sucks for most people, and is really slow to employ, but that doesn't effect me.
If need be, I rely on my underlings who will hand me a real flashlight (not a phone) when ordered. Or I'll fumble around in the shop, garage, or vehicle looking for one.
Being able to see is very overrated.