YouWorkForThem has crafted a brilliant series of Photoshop brushes that allow you to paint with light – digitally!
Spectrum Brush 01 by YouWorkForThem Design Studio
Spectrum Brush 01 is a collection of 50 brushes whose strokes capture the luminous quality of light. With softly-grained edges, the brushes in this series mimic the effect of light rays, making it easy to paint streams of light, reflections and refractions, spotlights, and light patterns.