Invisible – Controls whether the shape of the VRayLightRect source is visible in the render result. When this option is enabled, the light source is not visible in the rendering. When this option is disabled, if the light source is seen directly by the camera or through refractions, it appears in renderings in the current light color.
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The visibility of the light with respect to reflections is controlled by the Affect Specular and Affect Reflections options rather than the Invisible parameter.
Occlude Other Lights – Controls the behavior of invisible lights in relation to other light sources. When enabled, the light blocks the lighting from other lights as if it's visible. Also in reflections the light behaves as it's visible and occludes other lights. When disabled, the light is transparent for other lights and does not occlude them. This option doesn't affect visible lights (as they always occlude other lights) and dome lights (which are always additive).
Affect Diffuse – Determines whether the light affects the diffuse properties of the materials.
Affect Specular – Determines whether the light affects the specular of the materials. This means glossy reflections.
Affect Reflections – Determines whether the light appears in reflections of materials, both perfect and glossy reflections.
Affect Atmospherics– When enabled, the light influences the atmospheric effects in the scene.
Diffuse contribution – A multiplier for the effect of the light on the diffuse component.
Specular contribution – A multiplier for the effect of the light on the specular component.
Atmospherics contribution – Determines the amount of influence the light has on the atmospheric effects such as VRayEnvironmentFog, VRayVolumeGrid or Phoenix effects. This option is not available when rendering with V-Ray GPU.
