I was so impressed with this light, I bought two in white and two in red. The Thunderbolt casts a wide, short throw beam, not quite 180 degrees but close to it. The white Thunderbolt serves as a great fog lamp, and that's exactly why I mount it up front on either my front rack or my stem extension. Other bike lights blind me in misty conditions. The red Thunderbolt serves as one of my flashing beacon lamps. I mount it to my my rear rack or stay. The Thunderbolt has two steady modes and two flashing modes. In bright steady mode, the charge lasts more than two hours. In flashing mode, the charge has lasted quite a long time, like for weeks. But like all rechargeable lights, when battery power runs low, the light suddenly cuts out and shuts off. So I also carry a backup light for each Thunderbolt, which runs on disposable batteries. The Thunderbolt is easy to mount and remove so swapping lights is no issue. The Thunderbolt has been both useful and reliable. I recommend it for use within its limitations.
