There’s no need to look like a freaking funfair ride
Well if you ride a trike that looks like it came from one, you may as well 😉
Road bike always has two lights; one steady and one flashing. For redundancy. Both Cateye Rapid minis, which are great lights.
Trike has three lights, two steady (normally the minis) and one flashing (Cateye TLD-650) on a rear rack. Plus a fenderbot back up mounted on the rear mudguard.
For those with one light, do you check it is still working? I see a lot of very dim rear lights on my rides.
EDIT: And I ride with lights on the trike in daylight, along with a front flashing Joystick, because it is low and I need to be seen.