I have so enjoyed my Noxgear light vest that I bought last year. The Tracer2 is a lightweight and waterproof vest of small tubing that lights up in a variety of colors (your choice) for visibility at night. I also bought the extra add-in front lamp that snaps into the vest's buckles, so I can walk without a flashlight. No batteries in this model, just charges through a regular outlet.
It is easy to use - we just got one for my aunt (88 yo) who had trouble seeing the uneven sidewalk near her house on her evening walks. She had no problem getting it charged up and headed out. Then she showed it to all her friends when they came over.
Anyway, check out Noxgear's website. They are having a fall sale now and will have a Black Friday sale, too, I think. This would be a nice holiday gift for a family member who exercises outside in the dark hours. They also make a dog visibility collar that is pretty sweet, too.