Diffuse Lighting Boost (Material Option)
All point lights in this part have been reset to their default values with Indirect Lighting Intensity of 1.0.
This will specifically control how much of the diffuses color is injected into the scene. Using higher values will increase this injection.
Using a lower value will lower the contribution of the diffuses color into the scene that is using with lightmass for global illumination.
Value = 0
Value = 1 (Default)
Value = 100
I hope this has been helpful.