Have them tally the candies over the whole grid, not just for each source. Have each color of candy represent a different energy. Have the students graph how many candies are at each energy. This is the spectrum for your sources. Next, pretend that your detector can see both how many photons are at each energy, and where they fall spatially.
Light Curves Fill one of the boxes with candies.
Plug the bottom. When you unplug it, time the candies draining out for six ten-second intervals. Have the students count how many candies fall out in each ten-second interval.