A mate of frontman Mike Kerr's encouraged him to develop this song. He told Kerrang: "We were on tour with a band called Bass Drum of Death and their singer John Barrett is a good friend of ours. One night we were exchanging demos and showing each other ideas we were working on, and I showed him the first idea for this. Initially I wasn't keen on it, but he kinda of convinced me that we should do something on it."
The track has an unexpected influence. "We were going for a Daft Punk thing quite a lot and trying to f--k with the rock thing, I guess," Kerr told NME. "What would Daft Punk do if they wrote a rock tune?"
Mike Kerr sees this as the starting point for the How Did We Get So Dark? album. He told The Sun:
"There were lots of tunes written before this one but when Lights Out revealed itself and came together as a tune, that felt like a breakthrough moment. It felt like we had come up with a tune that had topped anything we'd done before. I guess aesthetically as well - the texture, all the elements of it, the more sophisticated production and the song. That set the tone for the rest of the album."
This was Royal Blood's second #1 on Billboard's Mainstream Rock chart, following "Little Monster" which peaked on the tally in July 2015.
"Pretty In Pink" by Psychedelic Furs was released in 1981. Five years later, it inspired a movie of the same name starring Molly Ringwald, Andrew McCarthy and Jon Cryer. The song was remixed for the re-release to have more Pop appeal.
"Kickstart My Heart" is about all the ways Motley Crue gets their blood flowing without drugs. It was inspired by their bass player Nikki Sixx, who claimed he had to be revived with a shot of adrenaline to the heart after an overdose.