Lumos is a spell from the Harry Potter series, created by author J.K. Rowling. It produces a beam of light from the caster's wand, illuminating dark areas. The spell is often used by wizards and witches to navigate through dark places or to read in low light. In the magical world, Lumos is a fundamental spell taught to young witches and wizards at Hogwarts School of Witchcraft and Wizardry. The incantation is simple, making it accessible for beginners. The spell can be countered by the Nox spell, which extinguishes the light.