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  • $\begingroup$ Does this give you exactly the same result as if you had used higher samples in the first place or just an approximation? $\endgroup$ Commented May 9, 2016 at 7:55
  • 1
    $\begingroup$ Short answere: Only an approximation. Longer one: You get (almost, very near, way below significance) the same result as using "clamp direct" and "clamp idirect" with the number of samples of the individual renders (if these values are already set and lower, then no difference). So the light loss will be the same as if you would set claming to 100 for example. $\endgroup$ Commented May 10, 2016 at 21:29
  • $\begingroup$ If you are more interested, look at the end of my edit. $\endgroup$ Commented May 10, 2016 at 21:30