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Light Cut-off | emLightsCutoff – This is a V-Ray specific control that works the same as the VRayLight cutoff parameter. This parameter specifies a threshold for the light intensity, below which the light will not be computed. This can be useful to limit the effect of the Phoenix light to some distance around the simulator. Larger values cut away more light; lower values make the light range larger. At 0.0, the light will be calculated for all surfaces, but the rendering could slow down significantly. Note that you need to reduce this parameter is sharp circular banding artifacts become visible.

Decay Type | emLightsDecayType – Controls how quickly the simulator's emissive light fades when travelling away from the fire light sources:

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