BUT: repeatedly the light has failed when the wheel had stopped in the rain. The housing is offenstichtlich not tight and the electronics then clearly offended. Times have the joint glued with silicone glue, and hope that helps. Only actually be a sealed housing with a product expected to "Made in Germany".
To mount yet: works well with both standard Lochabstaenden. About I geraetselt for a while because I did not see the enclosed small cable connector and correctly understood the lead attachment. A small sketch could simple minds like me save some puzzles.
PS: After approximately 1 year Use: gluing the joints with silicone seems to have helped, now lights regardless of the weather.