My family uses colored spot lights for decorating the house at Christmas.
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.