This is what I will be using for some Audax rides: ... cots less that £10 and there are brilliant

15000LM SolarStorm 3 x XM-L T6 LED Rechargeable USB LED Bicycle Bike Light



I have been using the older version (that use the rechargeable battery pack) for the past 3 winters for commuting, but these new ones use a powerbank.... I use this with a headband.

I have several large powerbanks and with my largest powerbank, I will be able to use the light for several days before needing to recharge the powerbank. I prefer using it with a headband, as if I want to light up the road further ahead, I just tilt my head up. If I am on a winding/bendy road, I can light up the sections that I want more light, just by tilting my head

I have an older Cygolite Hotshot for the rear, that also works whilst charged to a powerbank