When I add new lights, other lights get darker

[allenellis]

Hi all,

Sorry if this is common knowledge, I couldn't find anything useful by searching.

My scene has a few dozen lights in it, mostly texture emission materials but also a few area lights. Their powers are each around the low hundreds.

I'm trying to add 8 more lights (little spotlights inside the vertical truss), but when I do, the existing area lights in the scene all produce less output. The texture emissions are unaffected. I hoped that increasing the samples would help but that just reduced the noise.

Is this expected behavior?

Thanks!