---
title: "VRayLightMtl"
canonical: "https://documentation.chaos.com/space/VMAYA/111742834/VRayLightMtl"
format: markdown
---
This page provides some details on the settings available for the Light Material in V-Ray.

 

## **Overview**

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<details>
<summary>UI Path: ||Right-click on the geometry|| > Assign New Material...</summary>

||Right-click on the geometry|| **>** Assign New Material... **> VRay** section **> VRay Light Mtl**

 

![image](media://00aea47f-81e5-4793-9c5a-cc8df8b87167)


||V-Ray Shelf|| **> **Right-click to** Create V-Ray Materials **button **> VRay Light Mtl**


![maya2025_72010_Shelf_VRayMtls.png](media://d232cb88-4ef4-40c8-ad89-4ad96b258881)


||Hypershade||** > Window** tab** >** **Create... > VRay **section **> VRay Light Mtl**


![image](media://4991079c-ed85-430b-8787-f780949627d8)
</details>

 

## **Parameters**

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> Macro (anchor)



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### **Example: Default Color and Multiplier Values**

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For the examples below, the interior cube is the default VRayLightMtl. The exterior cube and ground plane have the default VRayMtl with Reflection. The rest of the scene is shaded with a basic diffuse VRayMtl.

This scene is rendered without any direct light sources.

 


 

 

> Macro (anchor)



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### **Example: Textures**

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This example shows using the VRayLightMtl with a texture in the Color slot. In order to control the strength of the light we will need to adjust the value of the Color Multiplier.

For the following examples, Emit on Back Side and GI are enabled.

 

 

 

> Macro (anchor)



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### **Example: Emit On Back Side**  


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In the examples below, the VRayLightMtl is applied to the curved plane.

 

## **Direct Illumination Settings**

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> Macro (anchor)



## **Notes**

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- You can use the VRayLightMtl as a light source assigned to an object. Increasing the Value of the color affects the **GI** solution and produces more light. Note that overbright colors may look the same as pure white but the GI results are different.
- If you know the photometric power of a self-illuminated object in lumens (e.g. 1700 lm for a 100-watt bulb) you can calculate the multiplier for VRayLightMtl if you divide the lumens by the surface area of the object in meters, provided that the self-illuminated color is pure white.
- The direct illumination option will only work properly if VRayLightMtl is the only material applied to the object. It will not work if the material is part of a complex material like VRayBlendMtl. This restriction will probably be removed in a future release.
- Enabling direct illumination effectively turns the object with VRayLightMtl into a mesh light. All lights have their camera and refraction visibility linked, i.e. if primary (camera) visibility is disabled, this also disables visibility in refractions, although reflection visibility will be unaffected. If you need more control over the visibility for primary and secondary rays, please consider using a light object instead.