On the John Peel Stage at Glastonbury Festival 2010, she delivered a concert on June 25th. She played at the Dot to Dot Festival in Bristol on May 29. Throughout the summer, she appeared at a number of events. Goulding backed Passion Pit on their March 2010 tour and John Mayer on his May 2010 British tour in support of Lights. She recorded an original song for the film Life in a Day in early 2011. On July 11, she made her T in the Park debut. The entire collection was eventually released as additional content on the iTunes edition of Bright Lights. Her third EP was a live recording of a portion of her act during the 2010 iTunes Festival. It was originally announced that the lead single from Bright Lights would be the new edit of the title track with a release scheduled for 1 November 2010. In November 2010, Lights was re-released as Bright Lights, with six new tracks added. The album was supported by Nike and was released through Polydor as a running soundtrack in an effort to get her music taken up by the running subculture. In August 2010, she released a second EP, Run into the Light, containing remixes of songs from Lights. As of June 2012, the album had sold over 850,000 copies in the UK and 1.6 million copies worldwide. Its singles "Starry Eyed", "Guns and Horses", and "The Writer" peaked at Nos.?4, 26, and 19. Goulding's debut album Lights was released in March 2010, reaching No.?1 on the UK Albums Chart and No.?6 on the Irish Albums Chart.
"Wish I Stayed" was available as a free download as Single of the Week on iTunes Store UK from 22 to 28 December 2009. with Jools Holland (performing "Under the Sheets" and "Guns and Horses") and a UK tour supporting Little Boots. The single peaked at No.?53 on the UK Singles Chart following a successful appearance on Later. Although Ellie Goulding signed to Polydor Records in July 2009, her debut single, "Under the Sheets", was released through the independent label Neon Gold Records, appearing digitally in the United Kingdom on 15 November 2009. Goulding appeared on Tinie Tempah's debut studio album Disc-hit Overy's "Wonderman" (2010). Lena, a German singer, featured her song "Not Following" on her first album My Cassette Player. Goulding co-wrote "Love Me 'Cause You Want To" for Gabriella Cilmi's second album, Ten, and three songs for Diana Vickers' debut album, Songs from the Tainted Cherry Tree ("Remake Me + You", "Notice", and "Jumping into Rivers"). She also received the Critics' Choice Award at the 2010 Brit Awards, making her the second artist in history to do so. Goulding won the BBC Sound of 2010 vote, which displays the music industry's top selections for upcoming artists, prior to the release of her debut album.