+ another one for morgies light. It's incredibly small and convenient to strap it to any handlebar. so I can keep it in my bag and easily stick it on any bike I happen to be on after dark. It doesn't cast that much light under streetlights it doesn't do much for seeing, but in blinking mode it's great for being seen. Yesterday morning I took a ride at 5:30 am It was pitch black and foggy. once I got to sections of highway with no streetlights I switched it from blinky to solid and was pleasantly surprised it actually cast some very useful light. I could see the shoulder and road surface. I couldn't read my computer in the dark, but I was probably traveling 15-22. Just a touch slower than I would have been in broad daylight.

For the back I use a clip-on jogging light. I usually clip it to a zip tie which I have between the seat rails on all my bikes for that purpose.