plywood, gooseneck, C clamp, lamp socket and cord roughly 4" x 28"
The Clamp Lamp (did I come up with the name first, then build the lamp? possibly) is a very simple, very useful little light. Plywood base, a gooseneck, a light socket, and a cord are about all you need. Clamp it to a surface using a standard C clamp, and you're good to go.
I had an old construction light cover that I rescued from my grandpa's farm decades ago. Finally have a use for it.
Instead of a lamp, a magnifying glass can also be attached to the end of the gooseneck.