Originally Posted by
fietsbob
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.
That is weird, are you sure they're working correctly? My understanding is that nearly all dynamo lights sold today have a standlight built in. 8 years ago, before modern dynamo technology made dynamo lighting feasible, you used to commonly be able to buy dynamo lights without a standlight. But as far as I can tell, that is no longer the case today.
Are you sure your light is not defective? This is what the Peter White site has to say about that -
Bicycle taillights for dynamo
"Plus" is Busch & Müller's designation for a light with a standlight; "Standlicht" in German. The "Standlight" provides light for several minutes when you stop. The power for the light comes from a capacitor inside the taillight which is charged while the bike is moving. The Toplight Line Plus, Toplight Line Brake Plus, DToplight XS Plus, Toplight Mini, Seculite Plus and 4DLite Plus all have the same "Standlight" feature as the many B&M headlights, except that the light is as bright when you're stopped as when you're riding, since it's the same LED. We sell one dynamo powered taillight that does not have a standlight, the DToplight XS. We sell it for those people who would like to save money. It still has a large reflector area for added safety. So if you think you need to use a battery taillight in order to have a functioning taillight when you're stopped, that's just not the case. The "Plus" taillights remain lit for six or seven minutes after you stop, plenty of time for the light to turn green.