I found with the warm-yellow LEDs the posters appeared dull and kind of soft.
With the pure white LEDs the colors looked more natural and overall brighter.
So I have the files from a slightly different version from the OP's post. Where's the best place to drop this so others can contribute too? I'm thinking github. Another site perhaps?
Since posting this, I have got a few PMs requesting the files. I've posted them on my Skydrive if anyone wants it.