I saw the SON rear light and thought it could be a good option. However I can’t info on whether it runs directly off the dynamo output (ac voltage) or 6V dc. Do you know any other website provides this info? I will definitely need a strap to mount it on the rear rack.

Ideally seatpost or saddle mount would be the best position to mount the rear light. But as I have to lower the saddle when taking the bike into trains/buses I’ve to consider the cable management when folded.

I will search around to see if there are local shops or websites selling the SON lights.