Moving along. First, I was testing the order in which light scans occur by starting dark and getting lighter for each ten "pixels" scanned, the restarting. Working properly, it looked like this, and was pretty cool, so I took a snapshot.
This was closer, but I found 4 points where the light overlapped still, and corrected it. Now i need the bricks underneath to block the light.
Next, I wanted to see where the scans first detect shadow. There seems to be some sort of offset error I need to fix, but it's close to correct. Here's a video that is somewhat interesting!