I just went through installing my backlit marquee. I was using 2 of the logisys 15" white CCFL as a backlight. I finally got my reverse printed marquee from Brad here on the fourms and I found the CCFL to be a bit too washed out. I stumbled on the ledenet 5050 warm white that is mentioned in this thread and I can say I prefer it over the CCFL by a far margin. I have foil in my marquee area, but I think it looked the best when it was almost pointed directly out. I couldn't detect any hotspots at all.
edit. My marquee is equally brown, blue, yellow and red and it really doesn't "pop" as much as I would like, but it looks really excellent when the backlight is off.