The promo features footage of frontwoman Florence Welch as the band tour across America.
The clip, which is shot in the style of the old Super 8 film format, was directed by Tabitha Denholm, who has previously worked with Florence + the Machine on the videos for 'Cosmic Love' and 'Never Let Me Go'.
Welch recently told Digital Spy that she is working on a dance music project under a secret alias.
"We actually have a dance outfit side project called Side Project. We made this weird house track that sounded quite churchy - to be confirmed! As yet it has never seen the light of day," she said.
Florence + the Machine officially release 'Spectrum' as the fourth single from Ceremonials today (July 2).
Watch the video for 'Spectrum' below: