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How do you check your rear lamp on your bicycle is bright while riding your bicycle at night?. Get a fiber optic cable to run from yor rear lamp to the handle bar to indicate the brightness.
You can also use a fiberoptic cable and lamp to indicate which gear you are in. When a small mirror attached
to the gears moves it will illuminate a different fiber for each gear.
A fiber optic cable wrapped around the frame with a cracked outer cover will light up your bicycle.
I nabbed this link from Jutta's 'Broomcycle' idea. [StarChaser, Mar 25 2001]