Back of lamp is held by screw (in main body is thread M6) .

The Best solution for lightning the lamp is LED strip (RGB in my case). The cross of back is designed for led strip wide 10mm. And its up to you how the strip will be organize inside.

In my case its powered by 5V adapter so I did a little hole at the bottom of the lamp for cable. But you can insert some battery box or whatever you want.

On the wall is the lamp held by double-sided tape.

So choose wisely where the lamp will be ! :D