Lasers. Once thousands of dollars, now cat's toys from the dollar store. What a time we live in. And now they are on my bike. I purchased the Ampulla C1, it gives you rear-light, turn lights, brake lights, and laser-lines on the road to encourage traffic to give you some space.
Now, the lasers are not incredibly bright, so during daylight they are useless. But, here you can see a picture in my garage, its reasonably bright in there and they still show, so I'm optimistic for the full-on dark.
The unit has an 18650 battery in it, and charges via micro-usb. A hack for another day is to drive it off the main battery. It also comes with a handle-bar mounted remote-control which is wireless.
Will it save my life? If I'm still alive next week the answer was yes!