"Lights" debuted at number one on the UK Albums Chart, selling 36,854 copies in its first week. The following week, the album dropped to number 16 with 19,398 copies sold—the third biggest fall from number one ever in the UK, after Christina Aguilera's "Bionic" (2010), which fell to number 29, and George Harrison's "All Things Must Pass" (1971), which fell to number 18 (although the latter had already spent eight weeks at the summit and was partially affected by a postal strike). Following the release of "Bright Lights" in late November 2010, the album re-entered the top 100 at number 24, selling 23,629 copies. It was the 24th best-selling album of 2010 in the UK, having sold nearly 300,000 copies by late November 2010. In early January 2011, the album returned to the top 10, where it continued for six weeks. Following Goulding's performance at the reception party of Prince William and Catherine Middleton's wedding on 29 April 2011, the album returned once again to the top 10 on 8 May after an absence of 13 weeks, jumping from number 23 to number 10 on sales of 11,981 units. "Lights" was certified double platinum by the British Phonographic Industry (BPI) on 22 July 2013. By April 2020, the album had sold over 840,000 copies in the UK.