I had bought the Ikea NÄVLINGE desk light for reading in bed. The amount of light it produced is too much. To dim the light I drew a simple cap that can be places on the led light. It looks good and gives a nice dimmed light.

Included are the STL file and a FreeCAD model where the parameters can be changed.

I sliced it using 0.20mm speed preset and printed it using white PLA.