Here's what Omnium has to say:

The Omnium Dynamo Rack Mount, featuring a single pivot point, is the perfect solution for attaching a dynamo light securely and precisely. This pivot design allows easy adjustment of the light’s angle, ensuring optimal visibility without obstructing the rack’s cargo area.

The ideal solution for reliable lighting while carrying loads.

This mount is both practical and streamlined for urban and adventure cycling.

Compatible with most upside-down mounted lights like the Supernova E3 Pure 3 Up-side Sown and the Son Edelux II Upside Down, there are definitely more lights out there but these are our favourites.

• • • Weight 20g
    • Matt Black Anodised
    • Mounting bolt included
    • Single pivot design

Specifications

Disclaimer: Make sure to only use the mount with dynamo lights that have an upside-down mounting point, to not have the wires turn upwards and exposed to rain and always follow the manufactures guidelines.