Knog Cobber Big
Knog · 360° achterlicht· €49.95
Our verdict
If you want a single rear light that stands out sideways and finally offers USB-C, the Knog Cobber Big at 50 euros is hard to beat. Only buyers in the ultra-budget segment will find a better deal at Lezyne.
Detailed review
The Knog Cobber Big tackles a problem every Dutch cyclist knows but few lights solve: side visibility at junctions. A standard rear light like the Lezyne Strip Drive Pro in this list beams mainly backwards; at a crossing like Stadionplein or a roundabout in Groningen an approaching driver only spots you once they're almost on top of you. The Cobber Big spreads its 170 lumens across 330° via a curved LED strip, making you conspicuous from almost any angle. That's the difference between being 'seen in time' and 'spotted too late'. Dutch law mandates a steady red rear light (RBL); riding unlit costs €55 plus €9 admin fees.
Caveat: flashing or pulsing modes are explicitly illegal as a primary rear light in the Netherlands. Thankfully the Cobber has a steady mode too, running 3 hours on high or up to 50 hours on eco — ample for a week of commuting in December's 7-8 hours of daylight. USB-C has finally arrived (earlier Knog generations used a weird built-in USB-A plug that stuck half out of the housing and broke quickly). 170 lumens is deliberately over-spec for night use — it's enough for daytime grey-rain riding, where ordinary rear lights simply disappear against wet tarmac.
Compare that to the Bookman in our list (40 lumens, largely aesthetic) and you see the Cobber plays in a different league. The silicone housing flexes around round and aero seatposts alike, but after 2-3 Dutch frosty winters you'll notice the strap stretching. Survivable at this price. The Cobber is IP67 waterproof — it survives an IJssel splash without blinking.
Who is this for?
- City riders who navigate frequent junctions and roundabouts
- Commuters who want daytime visibility in rain and fog
- Users with aero seatposts where standard clamp lights don't fit
What to watch out for
- Use only the steady mode on public roads — flashing is illegal in the NL
- Silicone strap stretches over time — replacement band costs about €8
Specifications
Lighting
| Brightness | 170 lumen |
| Beam angle | 330° |
| Modes | 8 (incl. steady) |
Battery
| Type | USB-C Li-ion |
| Runtime | 3 u (hoog) / 50 u (eco) |
Properties
| Weight | 39 g |
| Waterproof rating | IP67 |
| Mount | Siliconen band |
What does the ART certification mean and which level do you need for your bike or e-bike? Compare ART-1 through ART-5 and the requirements of Univé, ENRA, Centraal Beheer and Unigarant.
Pros and cons
Pros
- 330° visibility — you're seen from the side at junctions too
- USB-C charging port (Knog finally caught up)
- 170 lumens, bright enough for daytime riding
- Silicone housing — no fragile hinges or brittle clamps
Cons
- Flash modes are not legal as sole rear light in the Netherlands
- Silicone strap wears after 2-3 years of daily use
Use case fit
How well does this product fit different bike types?
| City Bikes | 94 |
| Electric Bikes | 88 |
| Folding Bikes | 86 |
| Trekking Bikes | 82 |
Where to buy
Amazon.nl
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