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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@user20714
I use this one from Halfords which has been surprisingly reliable and works well mounted under my out-front stem mount
https://www.halfords.com/cycling/bike-accessories/bike-lights/halfords-advanced-1600-lumen-front-bike-light-253334.html