Direct illumination option for emissive material (to avoid noise)

As is the case with most render engines, using an emissive material results in a huge amount of noise.

Fstorm render has a nice option in its emissive material, whereby checking a 'direct illumination' checkbox makes the render engine treat the object (or part of the object) with the emissive material assigned, as a true light.

Here's an explanation from the Fstorm manual:

"direct illumination enables direct lighting sampling. It must be switched on for small and bright light sources (like bulbs) because indirect sampling produces strong noise with such light sources. For big and muted light sources (like TV screens and light signboard) it should be switched off."