high-lumen LED flashlight that basically turns night into day, with a modern batttery that can power it for 6+ hours

Do high lumen flashlights last that long? (Edit: Yeah, Google says they only last 45 - 90 minutes. Admittedly, that would get you most of the way through most horror games.)

It might be a cool game mechanic to balance brightness and field of vision against battery life, though.