I can't believe I'm going to starve down here.
If you've found this, I hope you have better luck than me. I was carrying tools for the Death Guard when shadows attacked us. The team outside died while I got pulled in to the Temple and was teleported to this...place.
I've just about given up trying to understand the trees here. They reflect light, and I could rotate them when I first came here, but I just don't have the strength any more.
I hope this helps you: the cores not only reflect, but can be charged. If light enters from behind, it passes through and mixes lights together. As for the receivers, perhaps they have something to do with the colour wheel?