I have used two lights for reading, seemed to work well. When I read on my palm outside, and it was dark, I'd use this clip on light I found at Books a Million. It looks like an Ipod shuffle, forget then name, but it clips on to your lapel, or collar whatever the light focused on the book and it was great for reading. Except when I was lying in bed reading at night. Then I used a headlamp. Works great for me, had a straight stream of light. The hard cover I use would work great for clipping on but it's bulky. Usually the Jetbook seems to work great on reflected light. Good luck!
