Busch & Müller Lumotec IQ-XS vs Knog Cobber Big
Comparison 2026 — Bike Lights
VS
Our verdict
Based on our weighted scoring, the Busch & Müller Lumotec IQ-XS edges out the Knog Cobber Big with an overall score of 82/100 against 80/100. It scores particularly well on brightness (78/100) and battery life (98/100), 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 €45.00.
Brightness winner
Knog Cobber Big
6% higher than its rival
Value winner
Busch & Müller Lumotec IQ-XS
6% better value for money
Specifications
| Specification | Busch & Müller Lumotec IQ-XS | Knog Cobber Big |
|---|---|---|
| Price | €45.00+11% | €49.95 |
| Rating | ★4.6 (1,820) | ★4.5 (2,140) |
| Overall | 82/100+3% | 80/100 |
| Lighting | ||
| Brightness | 70 lux | 170 lumen+143% |
| Certification | StVZO, CE | — |
| DRL | Ja, automatisch >6 km/u | — |
| Beam angle | — | 330° |
| Modes | — | 8 (incl. steady) |
| Power | ||
| Type | Naafdynamo 6V/3W | — |
| Standlight | 4 minuten | — |
| Properties | ||
| Weight | 82 g | 39 g+110% |
| Waterproof rating | IPX4 | IP67+1575% |
| Mount | Vork- of kroonsteun | Siliconen band |
| Battery | ||
| Type | — | USB-C Li-ion |
| Runtime | — | 3 u (hoog) / 50 u (eco) |
Pros and cons
Busch & Müller Lumotec IQ-XS
Pros
- 70 lux dynamo-powered — no battery to charge, ever
- StVZO approved with sharp cut-off, no dazzling
- Daytime running light (DRL) boosts daytime visibility by 30%
- Standlight stays on for 4 minutes after stopping at traffic lights
Cons
- Requires an existing hub dynamo — not a plug-and-play retrofit
- Wired installation is more involved than clipping on a USB light
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