Moon Cerberus rear light

I bought this light for commuting to replace my Moon Meteor. It has a good selection of modes including a "pulse" one that I wanted, and you can change the brightness to make the battery last longer, but I agree with others it's tricky to navigate the options with the buttons.

What does drive me nuts (and I am surprised the reviewer did not pick up on this) is the mounting. It really is designed for no other option but a seat post - if like me you have a saddle bag permanently on your bike (essential to hold commuting spares) you are in trouble: I eventually managed to get it secure on one of the verticals on my rack but needed to use a couple of cable ties beneath it to stop it sliding, and if I didn't have the rack I'd have had no options at all. The other Moon lights I've had have been well designed and I assumed it was also going to be possible to do some other mounting option, maybe clipped to my saddle bag, but nope.

I'm also not a fan of how the light splits into 3 different parts (the light, the rubber backing and the rubber band) when you want to charge it - way more chance of losing something, especially the rubber band.

While the electronics and LEDs in lights is getting better, the outer case and mounting design seems to be going backwards.

I bought on this recommendation. But for me it's pants. **using and navigating the lamp functions, once you’ve found the largely invisible buttons, is complex and annoying**

Lamp could not be made secure on 8mm-diameter rear rack support, my chosen location – it wanted to rotate come what may. So it was seat post on my Trek Crossrip or nothing. There the lamp ended up a bit wobbly and angled downwards with no way of adjusting the angle – but that did not make much difference to light intensity, which was fairly good. But flashing in daytime was nowhere near as bright or effective as with my now eight-year-old **Moon Shield 60** (which I shall now have to keep going for a bit longer). The Cerberus attaches via a tabbed silicone ‘’O’’ ring (3 supplied) that hooks around your chosen stanchion and onto swivel clips at top third of the lamp, leaving the top of the lamp secure but not the lower section. Begging the question, why are the clips not central so the lamp is held squarely and tight? The back of the lamp consists of a removable silicone gasket that fits over three hex-bolt heads, seals the USB-C socket, and is held between the mounting surface and lamp by the ‘’O’’ ring. Therefore, to charge the lamp you have to dismount it - and not lose the ‘’O’’ ring or gasket. In the dark. Wearing gloves. It’s cold and raining. So, it’s just a matter of time before you lose one or the other and if it’s the eminently loseable gasket the lamp becomes useless, because obviously replacements are not readily available. The lamp charges - quickly - via USB-C socket behind lamp body. Chunkier USB-C plugs go into the socket but not enough to make contact, so you have to use the skinny lead / plug supplied, or other one you may have. The controls consist of two buttons at left top of the unit that are difficult to find by touch even without gloves, especially when lamp is on.

You really should review this bit about USB-C. That is actually pro, not con. 

Maybe time to reverse the "con" awarded for USB-C charging? After all, like you say, "it's not very convenient to have to use a specific cable"; increasingly that means USB-C now has the advantage.

A bit pricy considering that its based on a design thats been available from Chinese manufacturers for nigh on 5 years and you can buy them at Amazon for £8.99 - just search for Cocopa Bike Tail Light and your quids in. You can see them from the side just like this one. They come with a USC C cable also. They can be awkward to switch off if you wear gloves, but hey they designed gloves so you can take them off too specifically address this first world issue. They even have a rubber base that is for some reason seperate from the rest of the light, but they invented super glue to correcct this tragic design failure. Had 4 sets of them for 5 years and not one's failed me yet and still going strong - love the way the chinese make such great products and keep the price sensible.

Moon lights are excellent and USB c is ace, no more fumbling around trying to get the sodding end the right way round

I have a moon front light and it also is USB C and my rear light is micro. I am so glad everything is moving over to USB C - less cables to ferry around.

My Gopro, Samsung S9+ are all USB-C. Not a problem.

Garmin forerunner 45, not sure what proprietary little bugger of a cable that is, if I lose that I am stonked.

USB-C is a definite improvement over USB-B if only because you can't try to plug it in the wrong way round. (It's also better as it can handle more power etc.)

Its not the end of the earth USB C as I guess you can get an adapter but my garmin/lights/phone are all Micro USB B so I wouldn't be rushing out to buy one.  I guess that's where the reviewer is comming from.

They should be applauded for switching to USB C if they're doing it across the board - Unlike my Exposure lights which use a Mini USB on the TraceR and a Barrel plug on the Sirius

Don't quite a few smartphones come with usb-c? Mine did. Perhaps the reviewer is better off than  me and can afford an iPhone? 

Cable has standard usb A end

But what do you plug the cable into unless you purchase an adaptor?

Knocked for usb-c in this day and age - really?  Especially as a cable comes in the box.