I've got a Cateye Luminux fitted to the bar. It gives a reasonable light
about 3 metres in front of the bike, but not fantastic. Main purpose is
to be seen by those pesky motorists, riders without lights and
pedestrians on cycle paths.
Also get a good rear light. You don't want to get rear ended!
I also use reflectors in the spokes and wear irridescent straps on my
legs when riding at night. I'm lit up like a Xmas tree in the headlights
of a car, from any direction. But it's better to be safe than squashed.
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