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There are several ways to create a V-Ray Mesh Light.

You can use the button in the V-Ray Lights tab of the V-Ray toolbar. Right-clicking the V-Ray Mesh Light toolbar button releases or removes the Mesh Light from the original mesh.

The Asset Editor also offers creation of a Mesh Light from the Lights category. Once the asset is created, use the context menu to apply it to a selection in the scene.

Creating a Mesh Light can be done from the Rhino's Property Panel where the V-Ray Properties reside. Select the object(s) in the scene and press the plus button under the Mesh Light option.

As with all other V-Ray lights, creation of a Mesh Light is possible via the Command line and the V-Ray menu.

Invisible – When enabled, the shape of the light source is not visible in the render result. When disabled, the source is rendered in the current light color. This only affects the visibility of the light when seen directly by the camera or through refractions. The visibility of the light with respect to reflections is controlled by the Affect specular option. See Invisibility example below for illustration.

No Decay – Тhe light intensity is inversely proportional to the square of the distance from the light (surfaces that are farther from the light source receive less than surfaces that are closer to the light). When this option is enabled, the intensity does not decay with distance.

Shadows – When enabled (default), the light casts shadows. When disabled, the light does not cast shadows.

Double Sided – When enabled, light will be emitted from back-facing polygons of the mesh as well.

Affect Diffuse – When enabled, the light affects the diffuse properties of the materials. 

Affect Specular – When enabled, the light affects the specular of the materials.

Affect Reflections – When enabled, the light appears in the reflections of materials.

Affect Atmospherics –  Specifies whether the light influences the atmospheric effects in the scene. The value determines the amount of involvement.

Tex. Resolution – Specifies texture resampling dimensions for importance sampling in order to produce better shadows without affecting how the texture itself is rendered. Note that this parameter is not supported yet in V-Ray GPU.

Caustic Subdivs – Used by V-Ray when calculating Caustics. Lower values produce noisy results but faster rendering. Higher values produce smoother results but take more time.