Abstract: A laminated glazing unit is disclosed having controllable transparency to visible light and a solar load reduction element which preferentially excludes infrared radiation while being substantially transparent to visible light. The solar load reduction element comprises a Fabry-Perot interference filter which includes a film stack deposited on the laminated surface of the outer ply of the glazing unit. The film stack includes at least a zinc oxide film followed by a silver metal film followed by a second zinc oxide film followed by a second silver metal film followed by a dielectric film which provides good long term adhesion durability to an adjacent laminating layer of PVB or like material. The dielectric film preferably is zinc oxide with a thin overcoat of chromium oxide, SiO.sub.2 or, alternatively, is tantalum pentoxide.