I haven't found a battery powered light that I like better for randonneuring than the
B&M IXON IQ Premium. I run mine with a fork-crown-mount so it's out of the way and carry as many batteries as I need for the ride so I never have to recharge. I carry an IXON pure as a backup since it's smaller and uses the same mount and batteries, but it looks like they stopped making the pure.