Use Texture – Allows the light to use a texture for its surface. If there are surfaces which are close to a texture-mapped light, it is best to have GI enabled. This allows V-Ray to use combined direct and indirect sampling for the light, reducing the noise for surfaces close to the light.
Tex – Specifies the texture to use. Note: If an RGBA texture file (a file that contains an alpha channel) is used, the file's alpha output must be connected to the Texture Alpha attribute to utilize the alpha channel on the light.
Texture Cache Resolution – Specifies the resolution at which the texture is cached.
Cache Texture – When enabled, V-Ray will sample the texture and produce a lower resolution one to be used for the lighting. This greatly speeds up the rendering of mesh lights with textures.
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Project is used to create a list of objects that can be excluded (or included) from the light's effects such as illumination or shadow casting.
Mode – Specifies whether the objects in the list are considered included or excluded from the light's effects.
Objects – Creates a list of objects to be excluded or included.
