I used the itty bitty booklight for a while, but the battery pack was clunky and the bulb seemed to get hot.  Then I found the LightWedge booklight.  This booklight uses LED lights to illuminate the whole page with a "page" of clear acrylic.  The book light offers 2 brightness levels and uses 4 AAA batteries power the light up to 40 hours.  Really neat and easy on your eyes.  Great gift for an avid reader.  They make hardcover and paperback sizes, as well as night reading and mini sizes.  There is even a Harry Potter version of the LightWedge!