I created all the renderings on Sweet Hall machines. Setting up wasnt too hard.  And most of the files just required playing around with the position and number of lights. For most of the configurations, I first thought, that it is required to do some tone mapping in Photoshop to get the intensities exactly right. But later, found that I needed to do just some more tricks with the scene files.


For Configuration 1, a very small cone angle helped get the black background finally.


For configuration 2, the light needed to be kept close enough to give the desired effect, but that also produced a noisy image. After tweaking the radius and the intensities, I got an image that was quite close.


For Configuration 3, nothing special needed to be done. This was easy.


For Configuration 4, Couldnt really get the first light well. The overall image with the four light looks quite close, however the soft shadows on the actual image gave an impression that area lights were used instead of source lights.