I ride on unlit country lanes with fast moving vehicles and i currently have this set up..
On the front i run..
This as the light for the unlit sections.
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This as a back up/ light for normal roads, i run it on flash .
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On the back i run one of these on the rack(or seat post)
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With one of these on each pannier
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I cannot remember the last time i had a close overtake in the dark.