One of the rules for doing Randonneurs is that the bike needs to have a fender mounted taillight. For my application i.e. Fender mount, steady state and to comply with the reflector rule most states have PDW Radbot 1000 rear light narrows my options I also like using a rear light during the day
From the RAO Rule book
- Bicycles ridden at night must be equipped with a front light visible and operating from 100 meters (300ft.) and steady-state (not-blinking) rear red light or incandescent red light visible from 150 meters (500ft.).
- Reflective tape or plastic reflectors must be installed on the back of pedals, cranks, seat stays, wheels, and forks.
- Night riding shall be considered that time of day between 7:00PM and 6:00AM and at any time when automobiles would normally have their headlights on. If you have any doubt about the visibility conditions, operate as if it is night time.