I use Lezyne Super Drive (old model) in blinking mode during the day. You can see it a mile away in bright sunlight. It works like a magic wand & I wouldn't ride without it. Plus, it's a great "to see" for riding at night. 18650 batteries are rechargeable in or out of the light and could be replaced under 30 seconds. Cygolite Hotshot (the new model) covers the rear and I'm good to go! P.S. I also have a glasses-mounted rear view mirror to check to check my behind from time to time.