Plenty bright, and I don't find myself ever worrying about the charge--I plug it in every couple of days and it's all good. The screw which allows for angular adjustment on the mount does need to be tightened; at the default, most bumps are able to kick the light down to a lower angle. You're able to change the tension yourself with a small Philips head.
I was skeptical of it being very bright. However, the darn thing is blinding. Now in all fairness, it needs to be bright and blinding to someone looking at it from 6 feet away. This light is easily seen by cagers approaching and it has several different patterns which are good to have. Longevity? Who knows as it is new to me and I will have to see. As to what it is intended to be, bright and noticeable, that it is!