I agree that the Bolt Texture and Bolt Width seem to be hard coded in the part of the program that creates the random branching shape.

The code does include a routine that dims the lightning with distance, but the lightning does not seem to create any visual effect on the surrounding environment.

The timing, and duration of the lightning can be adjusted in the Lightning.xml, as well as switching the Flash Texture that is used on the top of the bolt at the base of the cloud.

The size of the flash in game is independent from the size of the texture being called for in the xml.

There does not appear to be anything in AnKor's Shaders or the Effects.xml related to lightning.