All light sources will produce a configurable amount of dust. The dust also has physics! Highly customizable via in game config menu.
Dust created from light coming from the lava pool
What the config screen looks like
Snow dust
Dust created from the campfire at night
Heavier dust that spawns in deserts
Dust created from lanterns in the night
Sporelike dust in lush caves
Modded items work too!
dust created from torches lighting up the dark cave
Guide that shows when you click the format guide button
It shows you which variable you need to add, what it expects and what the delimiter (separator between variables) should be