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Affect Diffuse – Determines whether the light affects the diffuse properties of the materials.

Affect Specular – Determines whether the light affects the specular properties of the materials. This means glossy reflections.

Affect Atmospherics – When enabled, the light influences the atmospheric effects in the scene. This option is not available with V-Ray GPU.

Diffuse Contribution – Specifies a multiplier for the effect of the light on the diffuse. 

Specular Contribution – Specifies a multiplier for the effect of the light on the specular.

Atmospherics Contribution – Determines the amount of influence the light has on the atmospheric effects. This option is not available with V-Ray GPU

Area Speculars – When enabled, the specular highlights are computed with the real light shape, as defined in the .ies files. For this to work, you also have to enable Soft Shadows. When this parameter is disabled, the specular highlights are computed using a point light approximation instead of the real shape. This option is not available with V-Ray GPU.

LPE Label – Allows a label to be assigned, which can be used to reference the light in a Light Path Expression. This is especially useful when working with the Light Select render element to evaluate custom light contribution in the scene.