Photolithotrophs (photoautotrophs) obtain energy from

Photolithotrophs (photoautotrophs) obtain energy from radiations and carbon from inorganic compounds.
Lithotrophs are a diverse group of organisms using an inorganic substrate to obtain reducing equivalents for use in biosynthesis or energy conservation via aerobic or anaerobic respiration.
The term "lithotroph" was created from the Greek terms 'lithos' (rock) and 'troph' (consumer), meaning "eaters of rock".