Knog Big Cobber Rear Light

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.

In addition to good visibility and long run time, this rear light is especially easy to mount to my bike. Much easier than the Lights and Motion lights I used previously. I also have a Cobber front light ( yellow) , although that one is a bit smaller than the rear red one. The front one mounts the same way, also lasts quite a while, and is another great addition to my bike kit.

I use this light on the flag mast of my recumbent trike. Since the recumbent is quite low relative to vehicle traffic, increasing visibility in terms of both height and side angles is especially important. The Big Cobber allows me to do both.

It's only downside is that in order to connect the charging cable, the attachment bracket must be removed from the light each time.

I bought two of these lights. They were very bright and easy to use so I got a couple more. Two of them died in a rainstorm. The other 2 just stopped working after about a year. I have the Knog Mob blinder lights as well, no problems with that model

Have used this light for less than 6 months riding in southwest. The charge lasts less than an hour even after following manufacturers instructions. Light no longer works even after full charge. This is poorly made overpriced product that I regret buying

First, this light is huge, and can seen from the back and sides. I love the attachment mechanism - it stays in place and is easy to mount and un-mount. I have owned a number of Knog lights over the years and this is on par with those. Put another way, if you like other Knog lights you'll probably like this one as well. It's a little pricey, but can you really put a price on being seen? Worth every penny in my opinion.

I give this light a split star rating. Five stars for the light itself. The light is very bright and well seen from the side and rear. I gave it a four star rating due to the attachment system which is a rubber band. I would prefer a clamp, but it has not been a problem on the gravel roads I travel. Easily charged with the supplied cord or a direct plug into a USB port.

Im on my second one of these since October and now its about to go back. Fits my aero seat post, is Fantastically cool looking and bright but as soon as you hit a little rain, game over. Works again after it dries out but battery life is tremendously shortened. So disappointed.

This is the absolute best light for an aero bike. Get a decent 5-6 hours out of a charge using the mode that slowly flashes around the whole light radius.