Opal glass is mouth-blown to form Windham’s detailed diffusers. Stepping along the canopy, backplate, Base, Bulb Base, and arms adds subtle decoration. A hang-straight canopy makes Windham adaptable to various mounting surfaces.,Opal glass is mouth-blown to form Windham’s detailed diffusers. Stepping along the canopy, backplate, Base, Bulb Base, and arms adds subtle decoration. A hang-straight canopy makes Windham adaptable to various mounting surfaces.