TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Article: The architectural article is installed as part of a building and allows visible light to enter the building through the visible light-transmitting reflector. The visible light-transmitting reflector has an average visible light transmission of at least 30 percent. The multilayer optical film is a color-shifting film having a left band edge in a range from 600 to 750 nanometers. It has an average light reflection of at least 50 percent at a normal angle to the multilayer optical film in a wavelength range selected from the group consisting of 650 nanometers to 1100 nanometers, 650 nanometers to 1500 nanometers, 875 nanometers to 1100 nanometers, and 875 nanometers to 1500 nanometers. The architectural article further comprises an ultraviolet light protective layer on at least one surface of the visible light-transmitting reflector. The ultraviolet light protective layer comprises poly(vinylidene difluoride), poly(methyl methacrylate), and an ultraviolet light absorber. It is a multilayer ultraviolet light reflective mirror. The architectural article also comprises a visible light-transmitting substrate to which at least the multilayer optical film is applied. The multilayer optical film is formed into multiple reflective surfaces that reflect onto multiple photovoltaic cells; or the multilayer optical film is present in multiple parallel ridges separated by multiple land areas, where multiple photovoltaic cells are located in the multiple land areas. The architectural article further comprises multiple parallel ridges each having first and second opposing ridge faces, where the visible light-transmitting reflector is located on each first ridge face, and where the photovoltaic cell is located on each second ridge face. It also comprises at least one of an anti- soiling or a scratch-resistant coating on at least one surface of the visible light-transmitting reflector. The power output of the photovoltaic cell is increased by at least 25 percent in comparison to an equivalent photovoltaic cell in the absence of any concentrating mirrors. The photovoltaic cell is a crystalline silicon single junction cell, a ribbon silicon cell, a copper indium gallium selenide cell, or a gallium arsenide cell.