And here is another test I made last night. The thingy on the right is hollow (a sphere was carved out of the inside with a boolean operation. The thingy on the left is 'full'. One light bulb is placed behind each thingy. This is to experiment with the idea of carving out a skeleton from the inside of the object to simulate the mass blocking light. Not conclusive so far... howver, when I placed the lightbulbs inside the thingies, the one on the right was definitely brighter (but I lost the scene before I could save it).
