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I have an SP dyno and a Supernova front/rear light combo, plus a D1 Igaro USB charger.
You can run the lights and charge at the same time but you do lose light power. So, my preferred method is to charge a cache battery (any Anker, etc will do) during the day and then use that for gadgets during the night.
It's fine if you just need a 'be seen' light but I like full power when riding lanes/unknown roads in pitch black.
I'm a complete novice with Dynamos and their associated kit but I just got myself a SP PD-8 dynamo wheel and want to kit out my commuter bike with a decent front light, back light with potential to use USB power from the front light.
I think I read you can't have the lights and charge from the USB output??
99% of my use will be on lit roads in and out of central london but I'm planning on doing some late evening jaunts for training in the winter.
Q's are:
thanks