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The Luxos U has a terrible reputation for failure though. Plus the arrangement for the handlebar button went through 3 different revisions (plug in, captive, captive with a spindly dangly USB socket) none of which were good. I wouldn’t recommend anyone buy one, especially out of warranty.
Maybe SON will get it right.
B&M have had a light with switch and USB for years if you can live without the uber powerful blinding light
https://www.bumm.de/en/products/dynamo-scheinwerfer/produkt/179u.html