I ordered the reading light for my Sony PRS-300. For this size, the light is optimal and the reading field lights completely. For the larger models of the reader, it would be only partially recommendable, since the light at the bottom of the page is then probably too weak. My advice: If you have enough space on the reader on the side, I would recommend to attach the reading light on the side. So I make it part of my normal books also. This gives the reading field completely light.
