Not looking for USB charging.

Exposure flare
Cateye

Anything else ?

Thanks

Moon comet. Mounts to the seat rails. I have a couple of genuine moon ones and 3 Aldi ones which are the same but different. All have been good but the battery life isn’t great for multiple rides without charging even on the lowest setting.

Fizik do a saddle / light integrated combo.

Fizik do….I just got one.its shit.

Fizik saddle and Cateye mount. Or a Cateye seatrail mount. The Cateye square rear mount is ubiquitous for all their rear lights and generally excellent.

Moon works the same way as the rail mount but I’ve seen one break and there aren’t as many options for other mounting points (Cateye have seatpost, rack and seatstay as well)

Four4th scorpion!

It is quite pricey but IMHO worth every penny!