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Name – The text added to the end of the rendered file, when saved as a separate file (e.g. myrender.lightselect.vrimg).

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 Type– Sets what type of lighting contribution is generated in the element as follows:

Direct Illumination – Lighting within the Light Select element behaves as normal and contains diffuse and specular information. 
Direct Raw – Lighting within the Light Select element behaves as a raw render element.
Direct Diffuse – Lights within the Light Select element output only their diffuse contribution and contain no specular information.
Direct Specular – Lights within the Light Select element output only their specular contribution and contain no diffuse information.
Full – Lights within the VRayLightSelect element provide full output for all information available in the scene such as GI, SSS, reflection, refraction, etc.
Indirect –  Lights within the VRayLightSelect element output only the indirect scene lighting.
Indirect Diffuse – Lights within the VRayLightSelect element output only indirect scene lighting that originated from the diffuse contribution of the specified lights.
Indirect Specular – Lights within the VRayLightSelect element output indirect scene lighting that originated from the specular contribution of the specified lights.
Light Path Expressions – Allows capturing custom light transport paths with regular expressions.

LPE – Specifies a light path expression (LPE) string based on the OSL syntax. It can be used to filter certain light contributions.

Lights – Selects which lights will be affected by the Light Select render element.

Color Mapping – Applies the color mapping options specified in the Color Mapping tab of the Renderer tab of the V-Ray Renderer node. This option is enabled by default.

Denoise – Enables the render element's denoising, if V-Ray Denoiser render element is present.

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

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The With V-Ray Next for Houdini the LPE is enabled by setting the VFH_LPE_ENABLE variable to 1. With V-Ray 5 for Houdini the LPE is enabled by default.

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