Speaking about the song to Capital FM, Marvin Humes said: "I think we wanted to go out on a high and I think 'Billion Lights' has just got massive energy to it. I think we're probably most famous for our up-tempo tracks. You know, 'She Makes Me Wanna
', 'Eyes Wide Shut
', 'Beat Again
', so for us we wanted to make sure that the last song we leave people with had that vibe to it."
"So that people can go crazy, dancing and going wild," he added. "'Billion Lights' was the one that when we heard it we were like, 'Yeah, it's wicked!'"