as I have adopted a Hub dynamo , wired LED head and taillight setup .
One is sufficient B&M toplight line plus to be precise , capacitor powered standlight
keeps it on at stops ..
RUSA requires one tail light and one reflector if you're going to be out after dark on a brevet. I usually take the reflector off between brevets.
the fresnel lens and 2 LEDs light up a broad line, and the rest of the lens ,
which is a reflector as well, so
dividing them up to remove one would not be possible .
I recently moved to within a couple miles of anywhere in town (which is not large).