A high-output rear mudguard light built for serious daily use. The Union UN-4375 delivers a strong 220 lumens, making it significantly brighter than standard rear lights and ideal for riders who want maximum visibility in traffic.

Designed to run off both hub dynamos and bottle dynamos, this light keeps things simple and reliable. No batteries, no charging, just consistent output whenever the wheels are turning.

It features an integrated standlight function (approx. 4 minutes), so the light stays on when you stop at intersections. That’s where visibility actually matters, and this handles it properly.

Features

• Rear mudguard-mounted dynamo light
• 220 lumen output for high visibility
• Compatible with hub dynamo and bottle dynamo systems
• Standlight (Safe Stop) – stays on for up to 4 minutes when stationary
• LED technology for long life and efficiency
• Clean, integrated mounting on fenders

Best for

• Dutch bikes
• City and commuter bikes
• Cargo and utility bikes
• Riders prioritizing visibility and reliability