Knog Cobber Big vs Busch & Müller IQ-X
Comparison 2026 — Bike Lights
VS
Our verdict
Based on our weighted scoring, the Busch & Müller IQ-X edges out the Knog Cobber Big with an overall score of 92/100 against 80/100. It scores particularly well on brightness (90/100) and battery life (100/100), making it the better all-round pick in Bike Lights.
The Knog Cobber Big remains a sensible alternative if price is your main concern — it lands at €49.95 versus €89.95.
Brightness winner
Busch & Müller IQ-X
6% higher than its rival
Specifications
| Specification | Knog Cobber Big | Busch & Müller IQ-X |
|---|---|---|
| Price | €49.95+80% | €89.95 |
| Rating | ★4.5 (2,140) | ★4.7 (960) |
| Overall | 80/100 | 92/100+15% |
| Lighting | ||
| Brightness | 170 lumen+70% | 100 lux |
| Beam angle | 330° | — |
| Modes | 8 (incl. steady) | — |
| Certification | — | StVZO, CE |
| Standlight | — | Ja, met condensor |
| Battery | ||
| Type | USB-C Li-ion | — |
| Runtime | 3 u (hoog) / 50 u (eco) | — |
| Properties | ||
| Weight | 39 g+272% | 145 g |
| Waterproof rating | IP67+52% | IP44 |
| Mount | Siliconen band | — |
| Power | ||
| Type | — | Naafdynamo 6V / 3W |
Pros and cons
Knog Cobber Big
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
Busch & Müller IQ-X
Pros
- 100 lux with the widest, most even beam in its class
- Hub-dynamo powered: no more charging or battery swaps ever
- Standlight with capacitor — stays lit at traffic lights
- Fully weather resistant and virtually maintenance free
Cons
- Requires a hub dynamo — not an option for bikes without one
- Permanent mount: not easily swapped between bikes