Hey guys,
little update from my testings 
First of all, when I start thinking about my lighting, I always use the “sunny 16” rule as a baseline for my work. This has a couple advantages, mostly though, it helps me to set up a rough lighting in seconds and it provides context and relationship for real-world lumen values you get from light manufacturers. Also, since there are measured values like around 125 000 lux for full bright sunlight on a flat surface, if all these values line up nicely, you can work in a very convenient way.
Here is an example of a “sunny 16” chart:
The problem here is, when I use any of these values, I should clearly see a light with 1000 lumens and I don’t if I use manual exposure. So that’s what I am not understanding.
The whole story turns around though if I treat min and max brightness in the exposure section like they are 20 EV stops. It doesn’t feel accurate as well, but it seems to get the job done pretty well until I have a better idea XD
Here are some examples from I quick scene I just threw together. Skylight has intensity 1, Directional has intensity 50 and the spotlight has 800 lumens. The EXR file on the skydome uses a multiplier of 40. Exposure is locked to min 8, for cloudy daylight/interior and max 12 for something that is a bit stronger than soft sun.
This is by no means perfect, but maybe it helps someone to get usable results 
Cheers!
