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Clip-on lights for various devices are already available, most handheld gaming devices need them. From memory they work on anything from button cells to one or two AAA cells, and would be easily modified for Iliad use.
BTW, I'm lighting a glass-fronted bookcase, and settled on "medium" brightness LEDs in the 500mCd range. They have a spread of almost 180 degrees, rather than the 25 degree 10000mCd LEDs I'll be using for my camera ringlight. ;-)
Each shelf has four LEDs wired in parallel and set into a wood strip attached to the bottom of the shelf above. Each strip only draws 15mA, and it lights up the room at night.
The most difficult problem with these devices is not making them low power, it's getting the light spread and positioning right so it's useable. Most solutions tend to have a bright spot which falls off rapidly toward the edges. I've even seen a Nintendo DS light which uses a CCFL, to make the lens design easier.
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