Hi André
Your welcome.
No haven’t had this one yet.
Currently you can’t do what your asking in just this one blueprint, but there is a work around.
This is how you would do it. In this blueprint (sensor Light) create a scene with 100% lights and put it into “Lights - Switches - Scenes”, then create another scene with 20% lights an put it in “Scenes To Turn OFF”. Now set your option, sun goes down OR a specific lux value.
Now you will need to get another one of my blueprints called Turn Light, Switch or Scene On & Off with Trigger Conditions. This will turn it on and off on a trigger condition when the sun goes down OR a specific lux value. Once you got the other blueprint enter your scene of 20% in “Lights - Switches - Entities - Scenes” then create another scene that turns everything off and enter it in “Scenes To Turn OFF”. Now set your option, sun goes down OR a specific lux value.
The 2 blueprints will work together and give you what your asking
Hope this helps
Edit: Let us know how you go.
Blacky