Only chiming in because this is a test I was asked to test and got very different results, and was linked this thread as proof I was incorrect in my test results. Here is a screenshot to go along with today's test video. I tested this in Alpha 16 and got the same results as well.
View attachment 26310
I crafted 10 torches from scratch, opened the debug menu and F8 to bring the heatmap up, built a small tower, placed all 10 torches on the small tower and then sat there and watched it. The heat map never left 0.00%, no matter how long I sat there. Never saw anything spawn in.
Even used the "LE" command while sitting there for several in-game hours, waiting to see if anything appeared. Nothing there.
So if I am wrong, I cannot scientifically prove otherwise in my own game worlds. And I did read all of that in the XML files before even trying to test it in today's video.