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Photometric lights are designed to simulate a light source's distribution pattern exactly as they behave in real life by loading and using an IES (Illumination Engineering Society) file. An IES profile contains details about the light's behavior, such as how the light passes through fresnel lenses, its intensity , and its and falloff. For more information, see see VRayIES.

 

Mesh Lights 

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The VRayLightMesh can create light sources that have volume and shape defined by geometry in the scene, without the need to use self illuminated objects and global illumination. For more information, see VRayLightMesh.

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