It is a three prong light since it has a task light option on it. Here's the thing. I believe the holes have worn a bit and the opening is a hair wider than it should be on all of them. If I wedge the light pole just right and lock it in, the light will come on. Kind of a pain but a new light is 40+ bucks. If there is a way to fix it I'd like to try it. I'm open to suggestions.