A window lighting system may include a frame (1071, 1171, 1271, 1471) defining a perimeter of a window (1070, 1170, 1270, 1470). The frame may have a hollow interior. A driver (30), which may be located within the hollow interior or external to the window lighting system, may be configured to drive one or more light sources (1076, 1176, 1276, 1486). A lens (46) may be disposed along the hollow interior to focus light emitted by the one or more light sources across a surface of the window or into an interior of a building.