This rear light is actually top. Best luminosity. An eighth of a turn of the equipped with a SON-dynamo front wheel enough to the parking lights to power for 4 minutes. You could get 5 stars from me. BUT: This taillight has a design flaw. The GoldCap capacitor which ensures light is at a standstill, spot-welded to 2 straps and hangs in the air. In my wheel with a tire pressure of 6-7 bar, the parking light stops only a few months since dissolved by the vibrations (cobblestones, ...) one of the two solder joints on the condenser surface themselves. After 3 exchange times, I have refrained from buying more lamps of this series. Actually, it would not mean much effort to fix the capacitor itself (gluing, ...). For the manufacturers would have to test the product on a vibrating bench before. Trying to fix the problem itself is not synonymous: the plastic parts of the housing are stuck and can not be separated from one another without damaging them.