This is a variant of the Lumos or the Wand-Lighting Charm. Lumos Maxima shoots a ball of light at the targeted or pointed place when the wand is swung. It was used by Harry Potter at the Dursley home and by Dumbledore at the cave of one of the Horcruxes. It came from the Latin words "lumen" meaning "light" and "maxima" meaning "greatest."