Lots of great suggestions, thanks! I'm going with the PDW Danger Zone for the rear rack. I also have an old PB tail light mounted on the back of my helmet, I think it's called the Mars. I like the high/low combo of lights, and honestly I can't feel the weight of a small light on my helmet... probably too many years wearing heavy helmets in the army

Just finished washing the bike, time to add some reflective tape to the rear rack while it's still clean.