What lighting is in the viewport in an empty scene?

Development Asset Creation
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1

I create an empty scene and place a mesh inside it. The mesh is illuminated, however, there are no lights in the scene just the mesh (can be either bsp or one of my imported meshes). What type of lighting is occurring in the viewport when the scene is empty?

I have set the scene to fully lit mode. If I set it to unlit the screen goes black and remains black even if return it back to fully lit mode. Question is what is illuminating the mesh in the fully lit mode in the first place?

2

The editor will silently switch to unlit under the hood when there are no light sources. If you go into game, it should be all black.