The lights in the second image look brighter. Did you try to reduce their power?
I forgot to mention an other change that may change the rendering: the size of the light has an effect only on the new Light source added to the catalog. I will have to create a new SH3F lights file to make this feature available in the other lights too (at this moment, they will always have a 6.5 cm diameter).
I don't understand the problem you have with light coming through windows at night time. Do you use a bright texture in the sky? Do you still experience some problems if you use a color for the sky?
Thank you for your feedback.
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Emmanuel Puybaret, Sweet Home 3D creator
