The XTEINK is a really small and neat e-book reader, but it could possibly do with some lighting. Here is an adapter that allows you to easily attach an OSDUE LED Book-light to the XTEINK using the magnetic ring supplied with the XTEINK.
The model isn't very attractive yet, but it works very well.
The adapter and OSDUE LED are designed to fit together so that the light is securely held in the adapter without any adhesive or other fasteners.
I've also included CAD data in case anyone wants to tinker with it. I'm very excited to see what you come up with ;)