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 "launcher"-only in Left 4 Dead and Left 4 Dead 2, so use the following command instead: 
sm_cvar mat_specular <0 or 1> command (with SourceMod installed) or 
script Convars.SetValue("mat_specular", "<0 or 1>") (using VScript).