Lupine Mono SL Cover & Adapter

Cover with Logo to protect the glass while in your bag and an adapter to keep the quick clamp in place. 

The Adapter can pe placed inside the cover while not in use.

Here a link to the lamp:
https://www.lupine.de/produkte/fahrradbeleuchtung/fahrradbeleuchtung-(stvzo)/sl-mono

Edit: Added a25.4mm version