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.