Busch & Müller Lumotec IQ-XS vs Busch & Müller IQ-X
Comparison 2026 — Bike Lights
Our verdict
The Busch & Muller IQ-X wins this German dynamo-headlight duel 92 to 85, but the IQ-XS isn't a lesser light — it simply sits in a different price segment and bike type. Both are common on Dutch quality city bikes and e-bikes with hub dynamos (Shimano DH-3N80 or similar) and easily meet the Dutch lighting law (StVZO K-mark). The IQ-XS delivers 70 lux at 10 m, weighs 90 g, has a near-field strip illuminating just ahead of the front wheel, and costs €49.95. The IQ-X trumps with 100 lux, 115 g, a wider beam, 4-minute standlight on dynamo dropout, a refined heat-sink for overheating prevention, an automatic day/night sensor and a USB output to charge your phone while riding — at €139.95. On lighting the IQ-X scores 94 vs 82, on features 95 vs 70, but on value the IQ-XS wins 90 vs 72.
For commuters riding home at 17:00 in winter along poorly lit polder or country roads (think Amstelveen to Schiphol, Houten to Utrecht), that extra 30 lux is a noticeable gain in reaction time to obstacles. The USB output is an underrated feature — no more dead bike computer. For in-town riding with streetlights, 70 lux is plenty.
For most riders we recommend the IQ-XS; it exceeds legal requirements and saving €90 is saving €90. For e-bike commuters on dark country roads, the IQ-X earns its premium with genuinely better lighting and the USB charger.
Busch & Müller IQ-X
The IQ-X wins with 100 lux output, 4-minute standlight, automatic day/night sensor and USB charger — features that genuinely matter on dark Dutch country roads.
Busch & Müller Lumotec IQ-XS
The IQ-XS saves €90, delivers 70 lux with near-field illumination and easily meets the Dutch StVZO lighting law — plenty for urban commuters with streetlights.
Specifications
| Specification | Busch & Müller Lumotec IQ-XS | Busch & Müller IQ-X |
|---|---|---|
| Price | €45.00+100% | €89.95 |
| Rating | ★4.6 (1,820) | ★4.7 (960) |
| Overall | 82/100 | 92/100+12% |
| Lighting | ||
| Brightness | 70 lux | 100 lux+43% |
| Certification | StVZO, CE | StVZO, CE |
| DRL | Ja, automatisch >6 km/u | — |
| Standlight | — | Ja, met condensor |
| Power | ||
| Type | Naafdynamo 6V/3W | Naafdynamo 6V / 3W |
| Standlight | 4 minuten | — |
| Properties | ||
| Weight | 82 g+77% | 145 g |
| Waterproof rating | IPX4 | IP44+1000% |
| Mount | Vork- of kroonsteun | — |
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
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