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The V-Ray Light Mix Render Element provides adjustment control to the lights in the scene from project from inside the New V-Ray Frame Buffer.

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  1. Add the LightMix Render Element to your sceneproject. (Settings > Channel tab > LightMix rollout).
  2. Then, render the sceneproject.
  3. In the new VFB > Layers, set the Source to LightMix. 
  4. Now you can tweak your lights.
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Before rendering, set your lights to white (neutral) color and boost their intensity.

Rendering with lower intensity and then increasing it from the LightMix might produce noise in your render. If this happens, use the "To Scene" option and re- render the scene.

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Group by – Specifies how to group the lights into VFB channels:

Family Type – All instances of the same Revit family type are put in a separate channel in the VFB. This means that unique lights are distinguished in separate VFB channels indicating the respective family name and type. 
Individual lights – Each light goes to a separate channel in the VFB indicating the respective family name + element ID. This mode is recommended only for scenes projects with a small amount of lights. 
Light Groups – Creates a separate channel for each group of lights using that light group name. 

Exclude linked lights – When enabled, all lights from a linked Revit file go to an individual VFB channel. When disabled (default), the grouping rule is applied to lights in linked files too.

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When the Source is set to LightMix, you can enable/disable lights and adjust light intensity and color during and after the render. The modifications can be saved as light mix presets and reused. Light Mix automatically creates Environment and Self Illumination render elements.

Reset – Resets all changes made to default values.

Save – Saves the changes as light mix preset.

Load – Loads a light mix preset.To scene – Applies the current Light Mix changes to the scene. This sends all changes to colors/intensities back to the scene lights.

To Composite – Sends the Light Selects from Light Mix to Composite for additional post adjustments.

Recent – Shows a list of recent light mix presets.

Checkbox – Enables/Disables the selected light.

Multiplier – Specifies an intensity multiplier.

Color Slot – Specifies a color for the selected light.

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