More lights = more noise?

[maru]

I'm not sure if it's a bug. If not, I'd like to know why this happens.

Same settings, bucket rendering, one pass. Same happens in progressive mode.

Also happens with non-ies lights.

[Polymax]

It was always like that, and not only with IES. Sampling is divided into many copies of the light sources.

[Ondra]

This is perfectly normal, more complicated scene, more noise. When using 3 times more lights you can increase light sampling multiplier by 3 times to get (approximately) same amount of noise at cost of rendertime increase.

[maru]

Ok, I somehow never noticed this before. :)

Delete this thread or move somewhere else please.

[Ludvik Koutny]

Ok, I somehow never noticed this before. :)

Delete this thread or move somewhere else please.

Just to be sure, if you have time, i would compare it with Alpha 4 and Alpha 5...  just to be sure :)