First of all, congratulations to the Anglican, Personal Ordinariate of the Chair of Peter!
Here are a few photos of St. Peter’s taken a few years back on this feast of the Cathedra of St. Peter.
It is pretty dark in the Basilica, so steady is the name of the game. Here is a shot through the columns over the main altar toward the apse, where you can see the candles arrayed.
A closer view.
The bronze Cathedra is decorated with lighted candles only once a year, today.
The black bronze statue of St. Peter attributed to the marvelous Arnulfo di Cambio was always dressed up in his cope and tiara, with a ring on his finger and pectoral Cross on two days, 29 June and today. Then the modernists in the Fabrica started fooling around. Too triumphalistic. They started cutting out elements. Eventually they were restored except for the griccia alb.