I have a CatEye Rapid 5 on the Leader. Everyone except motorcycles seem to give me a full lane change. Go figure.

On the 1X8, I have a rear rack. I got a "floatie noodle" in safety green from Wally World and cut it to just a bit over the handle bar width.

Then I zip tied it to the front of the rack, crossways. No good.

I got a rack mount for the Rapid 5. Instant response..............I was passed with a full lane clearance.

Bottom line that I can tell...............bright stuff doesn't work near as good as high quality flashing lights.

YMMV