The lighting sure is finicky. The HDR processing makes it more so. It's pretty much done, though. We're getting reasonably consistent results, and keep going back to the same set-up. It's not as simple as making it look good; there's other considerations too. A great deal of the backgrounds that'l constitute most of the footage will be just the back wall, up close. I've found that too much contrast in the back wall is distracting when you stick a puppet image in there. For example. We're also not really sure exactly how warm or cool the thing is going to be overall. Probably pretty cool. It's more evil.