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UI Path: ||Select PhoenixFDSim|| > Attribute Editor > Rendering rollout > Smoke Color rollout

• This option refers to the internal Phoenix Light Cache, which is not related to the V-Ray Light Cache.
• This option is ignored when using V-Ray GPU or Corona. It works with V-Ray CPU.
• When using V-Ray Progressive Rendering, the Volume Light Cache option might slow down rendering startup or the overall render speed. 
• This option might produce artifacts when the smoke is very dense.
• This option might produce artifacts when objects cast shadows through the smoke.
• Rendering multiple copies or instances of the Simulator node with this option turned on might lead to slow-downs.
• This option will consume additional memory, so beware of high RAM usage when rendering very large cache files or a large number of copied or instanced volumes.
• When rendering in Volumetric Geometry mode, for any of these Render Elements: [ Shadow ], [ Raw Shadow ], [ Global Illumination ], [ Raw Global Illumination ] , the Volume Light Cache will require additional memory to produce the correct result.
• Some V-Ray render elements might not work when Volume Light Cache is enabled. Please consult this table.