Not dim-able, but incandescent.
http://www.amazon.com/Zelco-itty-bit...tty+book+light I have used them for years, love them. I bought flashlight bulbs as replacement bulbs instead of their bulbs, worked just fine and way cheaper.
I don't see why it wouldn't slip between the ereader and cover, or maybe to the cover itself? Depending on your cover.
S