These are the ones that my grandfather made several years ago. We have them now and they should last for many years to come.
They are metal wall outlets with a spotlight attachment. The stake is a piece of pipe/ conduit flattened at one end and cut to a point. They are held on with conduit fittings to the box. The wire is a 25Ft waterproof extension cord connected to the box with a wire clamp. All places that water could come in are sealed from the inside with silicone caulk. The outlets are covered with a outside outlet weather cover and then a piece of rubber to keep snow, ice and water from getting on the plugs.