FWIW there's a sub forum devoted to lighting and other bike gadgets.
Bike lighting is a big subject in it's own right, and you can spend anything from $10 to hundreds (plural) on bike lighting. If you're serious about lighting the road well enough to ride by, it'll cost real dough. OTOH if you're mainly interested in being seen by oncoming cars then any number of low cost lights will do the trick.
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