Busch + Müller IQ-X
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Facts
Summary of Reviews
We have read all expert and user reviews on the Busch + Müller IQ-X. In summary, this is what cyclists think.
7 reasons to buy
- The IQ-X is StVZO-compliant, so the beam is shaped to avoid blinding other road users.
- Owners and experts praise the IQ-X's brightness, one saying it's brighter than their 1,500-lumen Lezyne Super Drive XXL.
- Experts praise the wide beam spread, long reach, and uniform illumination.
- The IQ-X provides good daytime visibility, according to owners.
- Buyers and experts say the slits on each side of the light offer good side-on visibility.
- Owners and testers appreciate the versatile mounting options, including sideways mounting.
- A long-term tester deems the IQ-X durable after two years of regular use.
8 reasons not to buy
- Busch + Müller hasn’t tested this light to define its resistance against water ingress (IP rating).
- Several owners report water ingress through the cable inlet, resulting in broken lights.
- Testers and owners complain that the IQ-X isn’t as bright at low speeds as competing dynamo lights.
- Owners say the plastic lens scratches easily.
- This light doesn’t have a flashing mode.
- The part of the mount arm that connects to the bike is plastic, and multiple owners say it breaks easily.
- The IQ-X is not compatible with rim (bottle) dynamos or electric bikes.
- Busch + Müller states the brightness in lux, not lumens, making it difficult to compare with other lights.
Bottom line
Busch + Müller’s IQ-X is a 100-lux StVZO-compliant hub dynamo headlight. Owners and testers praise the brightness, beam spread and reach, side-on visibility, and versatile mounting. However, the weak light output at low speeds, fragile plastic mount, scratch-prone plastic lens, and limited water resistance are worrying. Multiple owners report broken mounts and failed lights due to water ingress, meaning the IQ-X isn’t suitable for use on bumpy terrain, on very wet roads, or in heavy rain. Most experts and owners praise the IQ-X’s quality and value, but its apparent susceptibility to water damage and fragile mount reduce its appeal.Expert Reviews
86/100 based on 1 rated expert reviewBusch & Müller IQ-X: Long-Term Review
Busch + Müller IQ-X Dynamo Headlight Review
Busch + Müller IQ-X Installation, Test Run, Review [Japanese]
Supernova M99 Dy Pro Test | + Comparison With B&M IQ-X [German]
Busch + Müller IQ-X – Headlight for Dynamos [German]
Excellent Illumination, Very Good Workmanship – In the Test: Busch + Müller IQ-X Dynamo Led Headlight [German]
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