I found this lamp at an estate sale, and it didn't have a light in it. I took it apart, but there is no place to plug a lightbulb in to, but there is a hole on the side. It's a ceramic tube with two electric coils. I'm wondering if there is a piece missing, or if this takes a special type of light bulb. I'm attaching pictures so you can see what I'm referring to. Any help would be appreciated.