Mounting tail lights on bikes

Closeup of European (Tubus) rack with integrated 80mm & 50mm mount point

Nearly every bicycle tail light sold seems to come with hardware to mount it to the seat post, and observation would show that is in fact the most common location for people to put them.  However, if you put a cargo rack on the back of your bike, this location can become impractical for a number of reasons.  The rack itself may block visibility of the light from the rear of your bike.  And if not, any cargo you may actually want to carry on the rack surely will.

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