The Harry Potter spell for light is Lumos. It is a charm that creates light by illuminating the tip of the spell caster’s wand. Lumos is a basic spell that is used frequently by witches and wizards, particularly when trying to navigate darker landscapes such as Hogwarts Forbidden Forest. The counter spell used to extinguish the magical light is ‘Nox’, the Wand-extinguishing Charm. Lumos is a relatively safe spell and used only practically. It is worth noting that some Harry Potter fans have discovered a hack that allows them to use the Lumos spell on their iPhones to turn on the flashlight feature by saying "Hey Siri, Lumos".