Knog

This a good light to be seen, but not to see in dark conditions. It has a 180-degree view, but the light isn't focused so you can't use it for night riding. That's fine as I bought this to be seen. The only criticism I have is the battery. As it's winter, I haven't used this on a long ride, but it seems like 5-6 hours is the max battery life on even lower setting. It also takes a long time to charge. So don't use it at night and don't expect it to last on a long ride and it's fine.

As far as lighting goes this Knog is great. About 180' visibility, numerous flash modes, holds a charge well.

The mounting setup is a little finicky. It took a while, including contacting Knog to figure out how to separate the light from the mounting clip. To be fair Knog was responsive and helpful. The normal seatpost mount works well. The other mount for narrower mounting points is awkward since the charging tab sticks out and the body of the light is on the big side.

The light itself is by far the best rear light I've ever seen. It makes me feel significantly safer. I've had multiple cyclist friends comment on how bright it is, and another friend in a car say that the "rolling flash" makes me look like something other than a cyclist and it really grabbed their attention. The light is bright enough that I don't have to look around much to see if it's on, as it's evident by how much of my bike and the ground around me it's illuminating. You can also plug it into the computer to change, delete, and customize (brightness, speed) lighting modes, as well as make your own. I found this useful for removing modes I don't use and changing the speed of the rolling flash, the mode I use most at night.

My only complaints are the male USB-A port for charging. You can use their included short extension cable, but without it, this means plugging the light itself directly into a USB-A port, which is less convenient (and charges slower) than something like having a female USB-C port. Getting the light off the mount can also be tough, but at least that means it's secure.

This is an update to my previous review, where I noted the primary weakness of this product: it's clasp. I wanted to note that Knog made good on its warranty, by sending me TWO replacement clasps, so kudos to them. My plan going forward is to always remove this headlight from the handlebar whenever I'm not actually riding the bike. This way, the pressure on the clasp will be minimized and I think I may get a reasonable span of use for this product. Perhaps in a future iteration of this light they can improve the mechanism of attachment.