mat_specular
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mat_specular is a console variable available in all 
Source games.
This boolean cvar enables or disable specular reflections.
Note: This console variable is flagged as development-only in Left 4 Dead and Left 4 Dead 2, so use the following command to bypass this: 
sm_cvar mat_specular <0 or 1> command (with SourceMod installed) or 
script Convars.SetValue("mat_specular", "<0 or 1>") (using VScript).
If a material does not have a diffuse texture (usually due to missing $basetexture), then the environment map will be rendered regardless of this cvar.