Usage:
   Renderer.DiffuseColor gray or r/g/b

Argument values:

This property is not a part of any defined type of object.

Used in a total of 35 .con files: Init.con

Parent directory of these .con files: Bf1942/Levels

Example: (from Bf1942/Levels/Wake/Init.con)
   rem
   rem **** Initialize level specific rendering settings.
   rem
   ShaderManager.SetTextureParam envmap bf1942\levels\Wake\Textures\ENVMAP_G_.rcm
   Renderer.VertexFogEnable 1
   Renderer.FogColorVec 0.71/0.74/0.79
   Renderer.GlobalLodPercent 1
   Renderer.GlobalAmbientColor 0.14/0.12/0.13
   Renderer.AmbientColor 0.1/0.1/0.1
   Renderer.DiffuseColor 0.4/0.38/0.36
   Renderer.SpecularColor 0.3/0.3/0.3
   Renderer.AnimatedMeshDiffuseFactor 0.8
   Renderer.AnimatedMeshAmbientColor 0.25

Go to the Renderer properties list page, Renderer page, All Properties list, or Main scripting page.