I think the picture speaks a thousand words:

enter image description here

  • $\begingroup$ More samples and using indirect clamp would help. Start with a value of around 10 and work down unti your happy with the results. $\endgroup$ – Timaroberts Apr 10 '16 at 13:37
  • $\begingroup$ blender.stackexchange.com/questions/4980/… $\endgroup$ – user1853 Apr 10 '16 at 16:36
  • $\begingroup$ meybe related: blender.stackexchange.com/questions/42908/… $\endgroup$ – user1853 Apr 10 '16 at 16:38
  • $\begingroup$ I think words are better when we don't know much else about your project... or post a thousand images worth of settings for your scene. But If you want a single worthwhile answer please upload a file so others can help you find the problem... you an use blend-exchange.giantcowfilms.com/help $\endgroup$ – user1853 Apr 11 '16 at 23:32

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