I am trying to get my head around physically based lighting in Blender.
I read somewhere the Cycles Sun Lamp is measured in W/m² so assuming that bright sunlight is measured at 120000 lux (https://en.wikipedia.org/wiki/Daylight) my intensitiy for the blender sun will be (given that 1lux = 0.0079 W/m2 for sunlight) around 980 W/m². This matches more or less with the readings from wikipedia, that states that the max sun intensity depending on its distance from the earth is 1050 W/m² (https://en.wikipedia.org/wiki/Sunlight).
Using the filmic Blender add-on I am now way overexposed. Here comes my first question: where do I compensate for that? I found two exposure sliders within Blender. One directly in the color management tab, which I assume doesn't affect the final rendering, but only the viewport lut. Or do I use the exposure slider under the render tab/film?
Second: How does cycles handle the light contribution from environment maps? In what relation do they stand to the sun intensity as they have a seperate intensity slider. Is there a rule of thumb to get them in the right ballpark?