Prince Harry has revealed the household "obsession" he now lives by after it was drummed into him and Prince William by his environmentalist father King Charles.
The duke admitted that at first his strange habit was something that baffled his wife Meghan Markle who was left confused by his behaviour, the Mirror reports.
He has since explained his reasoning behind his eco-friendly manner in the 2018 documentary 'Prince, Son and Heir: Charles at 70'. The father-of-two shared that he has an obsession with turning off all the lights in rooms when they are not in use and only using limited lighting when it's dark — a trait shared by his older brother William.