I used a standard "movie light". Its a 6" X 12" 25-watt wall light plate that has down-directional slots. It looks great, and creates a "light zone" which does not interfere with viewing on any screen. It's mounted about 18" off the floor.
It also creates an area of light on the floor that prevents falling from a riser (I have stadium seating myself), as well as showing the way out of a row of seats, if you want. I went so far as to include this lighting in my wireless Lutron lighting, so that I can adjust it even further.
My guests really like it - its non-intrusive, yet quite functional. Last, its very inexpensive!
Here's a photo - the light plate is directly below the wall sconce....
