I collect empty bottles from friends at local restaurants and bars in the Lexington, SC area. I have many dozens completed, with many times that amount to manufacture. I make about 25 per week and have a large collection of various bottles. Most wine bottles become night lights, while most whiskey bottles or unique soft drink bottles become lamps.
Here is a small fraction of the completed ones on a shelf waiting to be pack into carrying boxes so I can display them or deliver them.
These are waiting for my attention. Also the lower pictures show some of my stock of parts that are waiting for installation.
I have several home made jigs to drill and assemble lamps and lights. This is my drill press and diamond hole saw ready to cut a hole in the next bottle. This process usually only takes about two or three minutes. I then cut a hole in the lid of the bottle to allow it to look like an original bottle. (That assumes I have the lid, some bartenders throw them away.)