Fireflies are those tiny burnt out pixels, that ruin an otherwise great Blender render. But how to get rid of them? Here's several tricks that I've picked up over the years... 1. Use Bigger Light Sources This is probably the #1 cause of fireflies. With a tiny light source, Cycles has to work super hard to project light and shadows out of it. And since it's so small, it's very prone to error. Thus: