any reason not to use a few (or a handful) of these to light the marquee? easy to daisy chain and automatic on/off with the computer, led so they won't burn out, much less heat, less likely to discolor or melt the marquee.
http://www.newegg.com/Product/Product.aspx?Item=N82E16812551004
If it's bright enough, go for it. I got something similar like that from a friend that came from IKEA. It was like 4 bars like that and I already had a connection from my 5V that fit it and it works great.
It's this one, but I got it free, probably not worth $30
http://www.ikea.com/us/en/catalog/products/20119418/