For me, the taillight with a hub dynamo Shimano Dynamo DH3N20 is operated.
Specifications of the rear light: 0.6 Watts
The taillight looks very good and is very high quality. It shines very bright, so you can be seen clearly. Even from the side, you can clearly see it yet. For durability I can not comment, but I'll add later.
I am very pleased with this tail light, the only thing that bothered me a bit is the rather high price.