Metal hydride switchable windows and mirrors

The metal hydrides I am trying to make solar cells of, can also be used to make switchable windows. When hydrogen is added to a thin film of some of the metal hydrides, an abrupt transition from metallic or black to transparent can be observed. It has not yet reached any high grade of commercialization, but switchable windows are believed to become tomorrow's curtains for offices and lazy people wanting to shut the curtains with an application on their iPad.