Well, this is a thing. For those asking why, the answer is 50% why not and 50% I wanted to have a desk lamp that didn't take up desk space. I'm aware its odd, but hey, maybe someone will find it useful. I sized the slot in the back to fit my particular desk lamp, but I've included the solidworks file and a STEP file to allow it to be easily modified to fit any lamp you choose.
The author hasn't provided the model origin yet.