An interior mirror system includes an interior rearview mirror assembly having an imaging sensor and a reconfigurable display. Information displayed by the reconfigurable display, when the reconfigurable display is backlit by a plurality of white light light emitting diodes, is viewable through the reflective element by a driver of the vehicle. The mirror assembly includes at least one photo sensor and a control responsive to the photo sensor and operable to distinguish between daytime and nighttime lighting conditions. The control is operable to vary the intensity of information displayed by the display as viewed through the reflective element by the driver of the vehicle. When the reconfigurable display is backlit by the plurality of light emitting diodes during daytime lighting conditions, the control is operable to adjust the intensity of displayed information to at least about 1000 cd/m2 as viewed through the reflective element by the driver of the vehicle.