The ones I like are made with a square metal exterior junction box. 2 exterior plugs for things like electric skillets or such. A dimmer switch for the lamp. A short section of rigid conduit out the top, up to a socket for a bulb. Some type of lampshade, some made from plastic flower pots. A long exterior cord (16G if possible) to plug into power at the power post. Sorry, no pictures, but a c-clamp was welded to the box so it could be clamped on the edge of a picnic table. Some of out club members made several of these a number of years ago, but the pots they used for shades are no longer available.