Oshyan, yeah that one definitely has a pronounced glow, I have some tweaking to do with aurora's (duh!), but that little image at det .45 and AA 6, even with reducing Bob's setup (which I've now scrambled beyond recognition) from cloud quality of 40 to 24, and atmo quality from 256 to 128 took almost 14 hours on my 6 core machine (sheesh!). Here's a cruddy resolution test that has the terrain lit with some of the aurora, that's a definite factor that would be included in any final renders. Thanks for the offer!