These lights are designed for your rafters inside Round Houses.

They come in sets of 2. Each one is 1" (25mm) long with a 10mm lamp shade attached.

They take a 1.5mm fiber that you will provide and can be inserted and bent to your own design requirements. See https://www.dwarvin.com/blogs/stories/bending-fibers

These lamps are made from thin-walled metal tubing and a lamp shade.

To change the ambiance/color, add a drop of translucent paint to either end of the fiber. See the video on how to do this. To create an old-world look, I use the Tamiya X-26 Orange Translucent paint; however, you may use whatever paint you like or even a colored marker.