The Glow Charm (inc: Luminos) is a spell used to make a target luminesce.
Such a spell was created by Alexandra Quick in May of 2011. Quick first tested the spell on inanimate objects, then on insects, then on frogs, and finally on herself, with the intention of demonstrating the Charm during her end-of-year SPAWN exams.
Quick used the spell to cause her familiar Nigel to glow.