I usually just make lightning as post-work in Photoshop. Dead simple method to use by putting on a layer of clouds, and another layer or two of Difference Clouds, adjust the Levels until it's just practically jagged lightning-like lines, then Invert, and colorize. :) Then just select an area you think looks good, and copy/paste it in.

 

Currently using Poser Pro 2012 (Display Units = feet)

AMD Phenom II 3.2ghz (6 cores)

8gb RAM

Windows 10 Pro 64bit