>> ... Mighty Bright XtraFlex 2 ...
That was my FIRST purchase, too. But slap that sucker on the top of an eReader and hold it for an hour, and it gets heavy ...
I broke my OWN rule (purchase a lamp that uses commonly-available AA or AAA alkaline cells) and snagged a Barnes&Noble nook light. Uses two 2032 batteries - easy to find in the U.S. Photos at ...
http://gallery.me.com/clintbradford#...&bgcolor=black
It is lighter (pun intended) and I am using it now instead of the MightyLight.