Christmas lights were a common type of Christmas decoration.
Oxford Street was known for having several Christmas lights up during the season. (PROSE: Frontier Worlds)
The Brigadier described the lit-up surveillance devices planted in UNIT HQ by the Master as Christmas decorations. (COMIC: The Heralds of Destruction)
The neurological trackers the Thirteenth Doctor had created for Graham, Ryan, and Yaz resembled Christmas lights. (COMIC: Holiday Special)