Note the word .. almost , safe ..

B&M 4D senso Plus only has a stand light if you switch it on senso mode 3 stand light is the battery then..
turns on in motion and darkness off after a while stopped ..or run it off the battery in the 2 on mode .& you have to turn it off.

the plus is the Dynamo power switch position 1 was off ..when the battery only predecessor was installed ..

it goes out when I stop.. when paired with the E6 Headlight both go dark when you stop.