I have to agree with another review - it's almost too bright for nighttime viewing with both lights on. Fortunately you can turn a single LED on and it works fine. Because the clamp holds 3 AAA batteries, it's rather large. It works better to clamp it on a surface other than the book, like the back of a car seat. I like having standard batteries and will use rechargables in the future. Back to the 2 LED discussion, with both lit, it's good as a small flashlight.