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SomethingOrOther
@frank9755
I use one of these as my main light:
https://www.bumm.de/en/products/e-bike-beleuchtung/parent/331/produkt/331asdc.html?
It's the e-bike version. Just re-fitted it last week.
I run it off either a 4AA battery pack or a power bank. It lasts for about a week on 4 AAs and I can turn it on/off without stopping.