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The Light Mix render element provides adjustment control to the lights in the scene from inside the New V-Ray Frame Buffer (VFB2). When a Light Mix render element has been added before rendering, the intensity and color of the lights and light emitting materials can be changed directly from the VFB during and after rendering; lights can be enabled or disabled on the go, without the need of re-rendering your final output, or navigating to individual lights parameters during IPR. Furthermore, modifications made in the LightMix can be transferred back to the actual lights in the scene with a single click. This feature can handle individual lights as easily as light groups or custom selections.

Read more about LightMix on the Chaos blog and the V-Ray 5 for Maya Courseware dedicated page. 

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. VRayLightMix 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 VRayLightMix changes to the scene. This sends all changes to colors/intensities back to the scene lights.

To Composite – Sends the Light Selects from LightMix 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.

Right-clicking on an item in the LigtMix list allows you to select that item in the viewport.

Select lights in the scene – Selects the current item in the viewport.
Add lights to the selection – Adds the current item to the selection in the viewport.
Remove lights from the selection – Removes the current item from the selection in the viewport.

When the lights are grouped in any way, depending on the setting of the Group by parameter, selecting a group, selects all the lights included in it.

There are some general groups that are automatically created by the Light Mix RE, which allow you to control groups of lights:

All – Turns on/off all lights.

Environment – Contains the emitting effect of any map placed in Maya's Environment overrides (Render Setup > Overrides tab > Environment rollout).

Self Illumination – Contains either all parts of the scene which have a self illumination material, or only the parts of the scene which haven't been included in any groups specified by Light Selects. Some parts of the scene might also be present in this category if the individual number of self emitting materials exceeds the maximum range of 62 for all the Light Selects.

Rest – Includes all the individual lights that are not part of any group defined by a Light Select or exceeding the limit of the list (the limit of the list is 62 individual lights or Light Selects).