Can someone help explain the layers in this document
These layers exist in a document I am working on but I have do not recognize how these were created. I've stripped out all most of the stuff I understand and just left the layers that I do not get. The layers are used for lighting effects. I understand the gradient map layer. The curves layer I know what it is, but can't seem to reproduce the same settings, and the layer under backlight I cannot figure out what it is.
This file has the layers in question
https://drive.google.com/open?id=1p0iO38C58obB1Y__1gml9VrChzb4o1dL
This is the original sample file
3d glass window logo mockup copy3.psd - Google Drive
Thank you


