D'oh!!!!!! I am not thinking today. Lightning...not lighting....I get it! In that case I use the method above, but I use a different way of getting the glow. Once you have the base lightning painted, duplicate the terrain. Open the terrain editor and click smooth about 20 times. Then apply the "green lit" material from the complex fx section. Open up the material lab and set transparency to zero, with the color a light blue. Select the first lighting (the one without all the smoothing) and apply the same material. Only this time, make sure "fuzzy" is not checked. This should make it a lot brighter. Then render and see how it looks. What should happen is that the first lightning terrain should be a bright glow, and the second one should have all the right fuzz around the edges. You can see this if you download my lightsaber pack from freestuff.