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Is there a recommended brightness / settings I should be considering or is it each to their own?
Have an older model but mine is set on a lower brightness mode. Tend to run it on low which gives 36 hours. As it's mounted under a garmin out of reach, I use the trigger and tape it to the hoods to turn it up when needed.
Max would, IMO, be a bit much for the city and places on my commute like Richmond park to avoid blinding oncoming riders.
I like how my strada tells me i am good for 12 hours!