...additionally make sure that diffuse value is at 0.85 or lower (I use 0.80) to be in observance of conservation of energy. SnarlyGribbly's SceneFixer script addresses this plus a bunch of other scene related elements; http://orphans.basicwiz.com

Sometimes rendering with too many ray trace bounces is also a culprit, I usually don't render with above 6 bounces. If you are encountering color bleeding onto adjacent surfaces adjusting IDL Intensity within Dimension3D's Render FireFly dialogue (Scripts: Partners: Dimension3D: Render Firefly) to values less than 0.75 will help (bagginsbill suggests 0.65).

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