Enter Lightwedge! http://www.lightwedge.com/ I won this nifty product from a vendor at the Illinois Library Assn. conference last month, just in time to take on vacation. It's page-sized. It uses four AAA batteries. The LED light is bright, bright. It's great!
I made a carrying bag for it. There's a small pocket inside for extra batteries, though it shouldn't need new ones for quite a while. The brightness would show better if I took the picture in a darkened room.