@mike.maxwell will confirm, but some of the built in drivers work differently with configure / preferences.
- "configure" might set default values only and not respect preferences. Typically only run configure after manually swapping a driver.
- when preferences are set and you "save" - that's when some drivers actually send preferences to the device.
So if you save and then click configure, you might be overwriting the preferences back to defaults.
You can probably confirm the behaviour of the driver by turning on debug logging, then saving. See if the log shows preferences being sent at that point. Then don't touch configure and see if the lux stops reporting.