I was able to dial it in perfectly (just the right brightness, great uniformity around the set) for my 50" 85PZU, so the shutter adjustment should be good enough for a bigger set. Will play with it this weekend and post a picture.
I personally avoided the rope light idea because I wanted a perfectly neutral 6500k color temperature lamp. The rope lights at my local Home Depot were VERY yellow (YMMV). Pay all that money for a calibration and then screw up color perception by using a yellow lamp. Eeek.
The Antec bias light does NOT have a perfectly neutral color temperature like the Ideal Lume light. However, in the pictures posted online, it looks fairly neutral and I'm not sure how much of a difference it makes in practice. Especially if your wall is not a neutral shade.
My Antec bias light is looks a lot like the light reflecting off of the floor, from the window, in ArcticHaze's post (bottom left corner of the pic). White, with a very slight push towards blue, if at all. Its a lot like those lamps which are supposed to mimic "sunlight" for your office, etc. I mainly like my because it does not produce that "halo" look around the set. Not sure if that's the way its "supposed" to look, but I find that with the uniform brightness on the wall, its much easier on "my" eyes, while also providing enough ambient lighting for a darkened room.