this is for the NiteRider 250..
I have been running a NiteRider 650 for over 4 years now, without problem and am very happy with it. This is a smaller output, and I really don't have any experience with it. But REI has it on closeout and I am springing for one.. Auxiliary lighting is nice in the winter.. be seen and see ..
NiteRider Lumina Micro 250 Front Bike Light - 2014 Closeout - REI.com