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The parameters for this render element appear in the Attribute Editor under Extra V-Ray Attributes.

Enable – When enabled, the render element is included in the render output.

Deep output – Specifies whether to include this render element in deep images.

Filename suffix – – The explicit channel name. The text will be used as a channel name for multi-channel images or as a suffix in the rendered file, for single-channel images (e.g. myrender.lightselect.exr).

Apply color mapping – Applies the Color mapping options to the element.

Consider for Anti-Aliasing – When enabled, anti-aliasing is used where possible.

Direct illumination – Outputs all direct light bounces, including diffuse and specular information.
Direct raw – Outputs only the raw direct light bounces. No diffuse or specular information is included.
Direct diffuse – Outputs only the direct diffuse light bounces. No specular information is included. This mode is similar to the Lighting render element.
Direct specular – Outputs only the direct specular lighting information. No diffuse information is included. This mode is similar to the Specular render element.
Full – Outputs all available information in the scene, such as GI, SSS, reflection, refraction, etc. This essentially creates a Beaуty render for just the included light(s).
Indirect – Outputs all indirect light bounces, including indirect diffuse and specular information.
Indirect diffuse – Outputs only the indirect diffuse light bounces. This mode is similar to the GI render element. 
Indirect specular – Outputs only the indirect specular light bounces. This mode is similar to the Reflection render element.
Light path expression – Allows capturing custom light transport paths with regular expressions. Right-click in the field for a list of presets. See the Light Path Expressions page for more information. When enabled, an LPE Builder button becomes available.

LPE Builder – Opens the https://lpe-builder.chaosgroup.com/ webpage, available to help you compose expressions and track exactly which ray paths they capture.

Denoise – When enabled, the element will be denoised if a Denoiser render element is added to the scene.