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@LWaB
The vast majority of bottle dynamos are cheap and nasty and won’t hold up in intensive service. The exceptions are expensive and fairly rare.
Are you aiming to run the bottle dynamo on the tyre or the rim? Slipping in wet weather can be an issue.
Most front mudguards are too flexible to support a front light without fracturing from fatigue.
Take account of those issues and you will have a reliable system.