I have a sub surface shading material that will receive lighting from nearby light sources even if they are completely blocked off IF the opacity is low enough on the material.
In the example below I have a material with a subsurface profile and opacity set to 0.2
In the first picture a bright spotlight is shining through an open door. In the second picture the door is closed and the room is completely dark, but the subsurface material is oddly bright. This brightness goes away if I raise the opacity above ~0.6
