"Lights On" is a song performed by British singer Katy B and serves as the second single from her debut album, On a Mission.

It was released in the United Kingdom on 10 December 2010 as a digital download.

Having initially been predicted to debut at number 2 behind The X Factor winner Matt Cardle's "When We Collide",[1] "Lights On" debuted on the UK Singles Chart at number 4 on 26 December 2010.

The single served as the highest new entry that week but was beaten by Cardle, Black Eyed Peas and Rihanna with "When We Collide", "The Time (Dirty Bit)" and "What's My Name?"

"Lights On" also debuted on the Scottish Singles Chart on 26 December at number 11, again serving as the highest new entry for the week ending 1 January 2011.