Yet ANOTHER thread on a reading light. This is why we NEED a generc reader forum for such generic threads.
That being said, have a read of the following thread on lights for readers. It has some pretty good pictures and the buglight is probably the best one. It should work well with a 5", 6", 7", 8", 9.7", & 10" screen.
https://www.mobileread.com/forums/showthread.php?t=12668