Depends on what voltage protection it has built-in. Some (maybe most) rear lights are fine on their own, some burn out very quickly. SON’s website is rather sparse on information.
SON rear lights have no voltage protection. If you wire them direct to the dynamo hub, they will go pop.
Yeah I think I've proved that. Rear light died on me and couldn't work out why. Now I know.
@Brommers started
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Depends on what voltage protection it has built-in. Some (maybe most) rear lights are fine on their own, some burn out very quickly. SON’s website is rather sparse on information.