This tag is about forward facing lights on the front of a bike: on the handle bars; fixed to the front of the frame; on the forks and so on. It is not about lights worn around the head or on a helmet, but clearly the two cases are complimentary.

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Where is the light sensor in Busch&Müller Lumotec Cyo?

My B&M Lumotec Cyo dynamo light seems to be almost always on when in "sensor" mode - also when it's not really dark around. Could it happen that the light sensor opening got soiled? Sounds dumb, ...
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Cygolite Expilion Battery Replacement

Did anyone take apart the replaceable battery of the Expilion headlight? I assume it contains a 18650 like battery, but some have a protection circuit built in and some not. Any knowledge about the ...