What is Soft Source Radius supposed to do?

What is Soft Source Radius supposed to do? the source Radius softens the shadows but the Soft source radius doesn’t seem to do anything. Strangely enough I have just been looking thru the Docs and I cant even find a mention of the Soft Source Radius parameter.

Hi!

If I remember well with source radius you set the size of your light source (like the size of a light bulb), this is why you get softer shadows… soft source radius is visible on reflections: you can set how full/gradient your light is (inside what you set for source radius).