www.kraytracing.com

here test with QMC render.
but i've noise and bad AA (WHYYYYYYY???????????)

1 area light for windows
1 hdr low brithness
1 physical

low resolution 800x400
there's noise in left image.

Help please!!

identic noise witout hdr.

other test
area light threshold 4-8
blurring threshold 500/1000

AA
Quadratic G3 - Filter 1.2 - FSAA

I fast tip shoot:
- use Area Light Inverse ^1 instead ^2 - will be no noise! You can put Area Light exactly size windows and still will be no noise. I know this type of light has not physical behaviour but apparently it works great with Kray. These renders from corona are based on that solution.
- also because these area lights has a bit different behaviour the setting of FG can be lower so you can try Final Gathering with stronger setup.