Luminous energy is a type of energy associated with the Divination skill. It can be collected from Luminous wisps, located south of Sophanem, at level 90 of Divination. Each harvest of a Luminous wisp yields 22 Divination experience if an Enriched luminous memory is harvested, and 11 Divination experience otherwise. Luminous memories can be converted to Luminous energy for 1 experience each, with the exact amount of energy per memory depending on your Divination level.
One luminous memory and 5 luminous energy can be converted for 52.5 experience, while one enriched luminous memory and 10 energy can be converted for 105 experience.