Originally Posted by
rollagain
I have two favorites for tail lights: the Planet Bike Grateful Red, and this:
https://www.modernbike.com/sunlite-t...-.5w-taillight
Both are very powerful and run on AAA batteries. DO carry spare batteries for these; the Sunlite model goes through them fast, but you'll definitely be seen.
I have a Grateful Red that I use for riding around town and touring. Really like it. There is a USB rechargeable version. I bought the AAA battery version because of the chance that I would leave it on and deplete the charge and have to worry about charging it. (On tour, I always carry a few extra batteries for the headlamp.) On flash mode, the batteries last a good while.