While it has what can be considered a use case, to increase your visibility in the dark. However it's a terrible solution. Instead wear a high-vis reflective vest, and/or wear some kind of clip-on lights. I've got a high-power clip-on flashlight that I put on my belt for when I have to walk into our dark-ass parking lot, or otherwise need to see where I'm going and don't want to risk getting run over.