My Koga came with a B&M 4D Toplight senso, when I Got the hub Dynamo I replaced It with the 4D Senso+

Big red light able to be easily seen, in Senso Mode it comes on in the dark when you start moving,

in the Off position the + version, it still lights from the dynamo but goes off when you stop..

their other lights add a capacitor, that charges up , then it stays on at stops.. with out battery power..

German lights dont blink But the battery 4D did blink in a day time tunnel situation. left on in S mode, riding into a tunnel
then riding back out in the daylight again..




'/,