The spell for light in Harry Potter is Lumos. It creates light at the end of the casters wand, illuminating dark areas. In the Harry Potter series, Lumos 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. It is worth noting that Lumos is a relatively safe spell and used only practically. Additionally, there are some iPhone hacks that allow users to cast Lumos and Nox spells to turn on and off the flashlight feature of their phones.