..tiny light source inside the lampshade, is that it creates very hard shadows...
Yes, and a larger light-source inside the boundaries of the model keeps interfering with the model itself. Still, your result is better than I managed so far. But then, I got caught up in getting the bulb to look right as well. Will work with your inspiration exploring the .mtl opacity further at some point, but not tonight. A boat trip around the Oslofjord put me in a different mood - really this hot, this time of year... Not normal. Good luck with the dinner party. Love dinner parties, except the last 10 minutes before when getting everything ready seems impossible (and the tidying up afterwards). Hope your guest tastes well 
ok