hello Duane, and welcome to the GMB. Regret I know very little about night lights, and probably an equal amount on opaline, but........
Your attractive piece looks more akin to simply opaque pale blue glass, or perhaps what you might even call milk glass - if you hold it up to the light, does it show the 'sunset glow' typical of opaline?
Does the piece come apart in any sense, or is it a single picece of glass?