In the app store you can view the standard available flowcards, to get an impression of the possibilities:
Also:
For the range question, also ask in the official app topic please.
There seem to be no flowcards for that yet.
… source? In common, motion sensors send lux values along with a motion event (to safe battery life).
Yes, but it will just not change until the next motion event AND the illuminance changed in the meantime.
When you want to trigger on certain lux levels, you’d better look for a lux sensor.