Saint-Jean-Baptiste Day
While the cross is usually lit in white, the LED system allows it to be any colour, including the purple traditionally used between the death and election of a new Pope. Before the installation of the fibre-optic lighting, the purple illumination was accomplished by changing all the light bulbs. It is now controlled by computer. On various occasions, the cross has been turned red for AIDS awareness and blue for Saint-Jean-Baptiste Day. The resignation of Pope Benedict XVI presented a bit of a dilemma for how the cross would be lit; it was later announced that the cross would be lit in white during the interregnum preceding the election of Pope Francis on March 13, 2013.