My light died mid ride and I had to call on my girlfriend to come and pick me up from the freezing cold middle of nowhere and by the time she got there I was borderline hypothermic and still shivering the next morning!
So, what back up emergency lights that are bright enough to ride by.
Exposure Flash? Considdered a joystick as a backup helmet light as well, but probably overkill.
Nothing from China, I need it now and I want it to work after a month in a cold/wet/warm/sweaty jersey pocket.