Moon - Cerberus Rechargeable Seatpost Mounted Rear Bike Light 150 Max Lumens, Daytime Mode, USB Type C, 140 Hours Max Runtime

Product Information

The light comes pre-set with five different light modes which you can easily switch between including two constant, two flashing, and a Day Flash mode which can keep you seen in direct sunlight. Also included is the VLS system which allows you to set any lumen you want – simply press and hold the VLS button. With the VLS feature, each mode can also be adjusted between the minimum and maximum settings pertaining to the mode. Constant modes are limited to 5-50 lumen while flash and steady flash are limited to 10-100 lumen. Daytime flash can be adjusted to the full range of 10-150 lumen which can push the runtime all the way to 140 hours in the lowest 10 lumen setting. Although the three COB LED design of the Cerberus improves side visibility, due to the narrow profile of the taillight side visibility is limited to around 270°. If you’re looking for better side visibility, larger lights like the NiteRider Bullet 200 should be considered. Also while the COB LED design looks more visually attractive and is visible during daytime, the beam is less focused than lights like the Bontrager Ion RT or Light and Motion Vya Switch which means the Cerberus isn’t as visible from longer distances. THE VERDICT

Das Licht an sicht ist sehr wertig aufgebaut, hat nen abgedichteten USB-C Anschluss, die Halterung des Lampenkörpers selbst ist hervorragend flexibel durch die kleinen in Scharnieren gelagerten "Ohren" und die Leuchtleistung sowie die Möglichkeit, Blinken einzustellen ist ganz wunderbar. Side visibility is an afterthought for most light manufacturers, but the Moon Cerberus supplies genuine 270-degree coverage and is as bright from the left or right as it is from the rear. Instead of a curved lens or cutout that is supposed to spread the light from rear-facing LEDs sideways, the Cerberus has three separate LED strips with two of them dedicated to sideways light. For those heart-in-mouth moments when you're passing a junction that's full of dozy drivers ready to SMIDSY you, it's game changing. Inspired by Greek mythology, the Moon Sport Cerberus uses a 150 lumen three COB LED design for daytime visibility and excellent side visibility. Retail PriceDo you need to abide by these rules? If you live in Germany then yes, of course! For the rest of us, we can use our own judgement to decide which beam shape and style is best for us. It is perhaps polite and common sense to use front and rear lights that don't dazzle other cyclists, motorists and pedestrians, and if you want to make sure of this then you can look for beams that are StVZO-compliant. The problem is that not many manufacturers outside of Germany make them, with Lezyne and Cateye being two rare examples of brands that sell StVZO-compliant lights in the UK. Some brands such as Ravemen and Moon use refractive lenses to shape the beam so less of it's going into the sky, and we've found Ravemen's version with refractive elements to spread and lower the beam to be especially effective.

Pros: Best-in-class side visibility, fits any seatpost, aerodynamic shape, modes sensibly limited to five With its genuine 270-degree visibility, compatibility with aero seatposts, powerful output (especially impressive is the retina-searing day flash), extendable run-times, aerodynamic shape and low weight there aren't many lights that can shade the Moon Cerberus at this price point. I predict it will be particularly popular with time triallists now that rear lights in CTT time trials are compulsory as of 1st January 2020. It misses a perfect 10 because of the rubber bung that can be easily lost and the USB-C cable it uses. VerdictRaleigh UK Ltd, Church Street, Nottingham, NG16 3HT is authorised and regulated by the Financial Conduct Authority ( Company number: 00139076) and acts as a credit intermediary and not a lender, offering credit products provided [exclusively by Klarna Bank AB (publ)] [by a limited number of finance providers, including Klarna Bank AB (publ)]. Please note that [Pay in 3 instalments] [and] [Pay in 30 days] agreements are not regulated by the FCA. Finance is only available to permanent UK residents aged 18+, subject to status, T&Cs and late fees apply. Klarna.com/uk/terms-and-conditions

Consider what settings you will need. Most modern bike lights come with a number of steady, flashing and pulse modes, so go for some that have options if you're not sure what is best. A popular combination is a steady front light with a rear light on flash mode in urban environments; although, use your judgement to decide on how bright your rear light needs to be if you're running it on flash. Dazzling drivers and other cyclists doesn't really improve anyone's safety, so get a second opinion from friends or relatives if you're in doubt about how bright your beams are to others. You should also consider what environments you will be riding in and how much power you'll need (more on that in a minute). If you only ride on roads and never really stray onto unlit paths, you won't need to splash out on any front lights that are suitable for trail use. The sheer number of lumens isn't everything, as beam shapes have a big influence on how dazzling lights can be, but you're unlikely to need a front light with more than 800 lumens as the max setting if you only ride in town; even then, the highest setting will rarely need to be deployed.

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The second buttonis primarily used to vary the lumens. A long press activates the VLS mode and ramps the output from minimum to maximum, just release it at the required setting. And unlike most lights, the Cerberus is not just designed for a round-profile seatpost. The clamp has a clever system whereby two hinged wings and a flexible rubber pad make it fit both round-section and the sharpest bladed seatposts. You choose from three supplied rubber bands in the box to get the right fit, but any rubber band will do, such as the ones that come with Garmin stem mounts. Any light worth buying nowadays is rechargeable via USB (we only recommend rechargeable lights in this guide other than our dynamo option) so run time is less important for most cyclists nowadays; but of course, if you plan on doing multi-day adventures without access to electricity very often, you'll want lights with decent battery life unless you go down the dynamo route.