For V-Ray 6 we worked on updating the model for energy preservation for shaders. Energy preservation determines how the diffuse, reflection, and refraction color affect each other. V-Ray tries to keep the total amount of light reflected off a surface to be less than or equal to the light falling on the surface as this happens in real life.
The reflection level dims the diffuse and refraction levels, and the refraction level dims the diffuse level.
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