Answers

2016-02-12T20:00:17+05:30
Advantages include: low initial costhigh reliabilityeffectivesimple control of motor speed
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2016-02-13T00:06:33+05:30
Unlimited burn timeAlways availableHigh-efficiency optics designed to maximize the available power for the lamp (optimised for road use)Reliable (see below for known issues with bottle dynamos)Environmentally friendly and inexpensive to runUnattractive to thieves, due to difficult removal
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