Busch & Müller IQ-X

The Busch & Müller IQ-X is quite simply the best bike light you can buy if your bike matches the factory spec of a Dutch city bike: a hub dynamo in the front wheel. That sounds like a niche detail but it isn't — most Gazelles, Batavuses, Kogas and Union city bikes ship from the factory with a Shimano DH-series or Shutter Precision hub dynamo, and this Busch & Müller IQ-X makes full use of it. You never again charge a battery, swap cells, or come home in winter to find the light dead. For a daily commuter that alone is gold. At 100 lux it matches the Trelock LS 660, but the beam shape is extraordinary.

The patented Busch & Müller reflector system throws a strikingly wide beam with a gentle intensity gradient — no hotspot, no dark corners. On unlit Dutch polders and dikes that makes a big difference: you clearly see the verges left and right, something the Sigma and even the Trelock do less well. Naturally StVZO certified (Busch & Müller is German and practically co-wrote the standard): the sharp horizontal cut-off prevents dazzling oncoming riders. Crucial for Dutch traffic where four bike paths meet at a roundabout and everyone is coming at each other.

The standlight with capacitor is a classic Busch & Müller feature: stop at a traffic light and the lamp keeps glowing for a few minutes on stored charge so drivers still see you. The IP44 rating sounds lower than the Lezyne's IPX7, but remember: dynamo lights don't need immersion protection — they're permanently mounted on a bike left in the rain and have done so for 50 years without issue. The only real downside: your bike must have a hub dynamo. It makes no sense for an e-bike with its own battery-powered lighting, and if you prefer USB-rechargeable detachable lights, look elsewhere.