“Heartlight” is a song written by Neil Diamond, Carole Bayer Sager and her then-husband Burt Bacharach, and recorded by Diamond in 1982. It is the first track on Diamond’s 1982 album, also titled Heartlight, and reached number five on the Billboard Hot 100, becoming his eighth (and last) top 5 hit on the chart. It also spent four weeks atop the adult contemporary chart in late 1982, and was the last of his eight #1s on that chart.
The song is inspired by the blockbuster movie E.T. the Extra-Terrestrial, which Diamond, Bayer Sager and Bacharach had all seen together. When E.T. leaves Earth, his heart glows a luminous red, hence the song title.