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I've been using this light the past few weeks for commuting home around midnight and I'm really impressed.
Mainly riding on cycle paths and a mixture of A roads and unlit back roads and the lowest setting is plenty bright enough to see and be seen with. The brighter settings are great but not sure motorists would enjoy them being used on lit roads.
Don't forget to fit the little rubber sticker inside the bracket so that it stays tight on your bars otherwise it will slip.
The only very slightly negative point is that the light does rattle a bit in the mount.