I have that light, and I set up a video camera and shot video of myself riding 
away from the camera and stopping. The light flashes brightly several times 
when your speed drops (it's probably measuring a decrease in voltage as the 
bike slows down). It seemed pretty attention-getting to me.

--Eric N
www.CampyOnly.com
CampyOnlyGuy.blogspot.com
Twitter: @CampyOnlyGuy

> On May 4, 2016, at 10:40 AM, Kainalu <kaiviers...@gmail.com> wrote:
> 
> My toplight rear light supposedly brightens when I brake hard, but I haven't 
> been able to crane my neck hard enough to observe it in action. Figure it 
> can't hurt.
> -Kai
> Brooklyn NY 
> 
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