Flash: A sudden bright light that shines for a moment and then dissapears.
Flicker: A light that shines in an unsteady way.
Sparkle: A series of flashes of light produced by light hitting a shiny surface.
Beam: A line of light, electric waves or particle.
Twinckle: A small light that keeps changing from bright to faint to bright again.
Glow: A dull steay light, especially from a fire that has stopped producing flames.
Aureole: A bright circle of light.
Halo: A bright circle that is often shown above or around the heads of holy people in religious art. A circle of light or something bright.
Glint: A flash of light from a shiny surface.
Gleam or glimmer: A light that is not very bright.
Penumbra: An area of slight darkness.
Prism : A transparent block of glass that breaks up white light into different colours.