IES light source radius / rendertime?

[RRIS]

Hi all, I'm currently going through a queue of several interior renders and I'm noticing a few renders where the IES lights cast harsh shadows. I just found out that the IES light radius does affect shadow sharpness and now I'm wondering if it's doable to re-render some of my work.
I don't have much time to experiment though, so I'm asking here.. does the light radius affect render times a lot? I have scenes with 12 or more IES lights and can't really afford render times to suddenly triple or something.

[RRIS]

Btw, is there a limit on the number of (IES) light sources in a scene? I just cloned a few lights and one of them just wouldn't turn on, unless I deleted a different light...

[KeyShot]

There is no limit on the number of lights you can have in a scene. Does it matter if you use product or interior mode? If the problem persists please contact support@luxion.com or post your scene here, so we can investigate the issue you are seeing.