Thank you so much for the quick reply and the link.
I wish they have seatstay mount. The rear rack bracket will help, although I wish I could install TWO taillights, hence two brackets, on the rear rack. I think two taillights closely side by side can increase visibility enormously.
Thanks for introducing NiteRider Solas 2w. Will keep watching for any new videos about it
P.S.:
One thing about the Radbot 1k that I haven't found its equal is it is also a reflector.
You can make a seat post mount work on the seat stay or even a rack leg. I have this
rack and currently have a PBSF clone mounted on the NDS (left side) rack leg, on the seat post mount.
Take some a small bit of electrical tape, put one end on the metal and the other on a section of old inner tube*. Wrap the tube around itself until you approximate the diameter of the seat post, then take another section of tape to fix the tube to itself. I've got room on the upper part of the racks "dog leg" to mount 2 lights per side if I wanted, should I chose to make more 'shims'.
As far as the lack of lights that can do double duty as a reflector, well... they are few and far between. The NR Cherrybomb (I have the 0.5w) has a built-in reflector, though it's small in comparison to the Radbot. BUMM out of Germany have a few that have reflectors, but they don't blink, as German law mandates a steady only mode and prohibits strobes. I have a
B&M 4D Toplight mounted on the proper rack mounting point. So right now, I've got the PBSF on the left rack leg, the 4D at the rack center, and the Cherrybomb on the seat post.
*I tried just using the tube by itself, and using the clamp of the mount to keep the tube from unwinding, but it would not stay put. Someone here gave me the tip that I needed the tape to act as a friction agent to ensure that the tube (and the light with it) didn't rotate on every bump.