Lithophane light / holder / stand - 125mm wide slot. The purpose of this is to display swappable lithophanes / lithopanes that are 125mm wide and <3mm thick. Example of inserting lithophane:
https://www.dropbox.com/s/zlp1waoszssc9ac/2018-04-13%2014.52.50.mp4?dl=0

Designed to use the following items:

Bulb:
https://www.cbconcept.com/product-page/back-pin-led-g4-320-lumens-2-watt-20w-equal

Plug:
https://www.amazon.com/gp/product/B015OCV5Y8/

The bulb fits directly into the plug. The bulb is DIMMABLE! Use a 12vdc power supply

Included in this design is a heavily modified "Barrel to DC Adapter Holder" by @drofnas found at https://www.thingiverse.com/thing:2518532

The rest is 100% by me.