Default lightning, or how to adjust materials properties correctly Situation:
I always adjust my materials by hdri environment map. This method work well for me. But what if I want to share my materials, or sell it? 
I search for some default lightning setup and I found this question with link to default scene used for material preview in material panel.

Problem:
When I adjust my material by this default scene, material looks too bright in hdri lighted scenes, just because this default material scene has low lightning compared to hdri lighted scene.

Question:
Is there some general standard how to "calibrating" materials?
I found solution in "Cycles Encyclopedia" written by Blender certified trainers Frederic Steinmetz and Gottfried Hofmann. (Available on blender store or blendermarket.) Authors use this "Blender Material Preview Scene" by Robìn Marin. So I thing this can be considered as default scene for Cycles material settings.