Another Exposure recommendation here. Don’t think it’s been mentioned so far but their models have several “programme modes” as well as high-medium-low so you can choose the one that gives you most illumination for the time you are expected to be out: a couple of weeks ago I did an all nighter (here in the UK that means darkness from 5pm to 7am) - prior to the ride I set the unit up to give me most light for that time. Actually I had my wife’s unit as a spare so they were both set up to give ten hours on medium. I got 9hrs30 out of mine before it died and I needed to swap.
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