Lightbulb Sun is the sixth studio album by British progressive rock band Porcupine Tree, first released in May 2000, and later reissued in 2008. This album, along with their prior album Stupid Dream, is considered to have a more commercial, poppier sound, as opposed to the abstract instrumental sound of their prior albums, or the heavier metal sound in their subsequent albums of the 2000s. The album is divided into two parts between "Rest Will Flow" and "Hatesong". The first part concentrates more on melodic, pop elements of Porcupine Tree's style, while the second has a more experimental character.