In earlier pages of this thread, the "Sand Demon" was mentioned.
Yesterday I noticed that in the "seeds" mission (the one where you have to use the seeker droid) on Tatooine, there does actually exist a Sand Demon - albeit an "corrupted" one.
I wondered whether this had anything to do with the "Sand Demon" from the first pages of this discussion ?
I have a couple theories on where that special ray of light might be. It could be within an exhaustion zone or around that area having some hidden cave.