light_directional
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light_directional is an internal point entity available in all 
Source games since 
Left 4 Dead.(also in 
Slammin' Source Map Tools) It is a directional light with no falloff, similar to the direct lighting of light_environment.
Note:As with a light_environment, a light_directional is only emitted from geometry covered with the skybox tool texture.
Bug:
In Counter-Strike: Global Offensive, after the Wildfire update, this entity does not seem to be working properly or has to be set differently. It can create excessively dark shadows tinged with the color of the light_environment ambient color plus the setting of the light_directional. It appears to boost these colors tremendously now. [todo tested in ?]Keyvalues
- Pitch (pitch) ([todo internal name (i)]) <integer>
- The downward pitch of the light from the sun. 0 is horizontal, -90 is straight down.
- Brightness (_light) ([todo internal name (i)]) <color255 + int>
- The RGB color and brightness of the light. Colors must be between 0 and 255; brightness can be anything.
- BrightnessHDR (_lightHDR) ([todo internal name (i)]) <color255 + int>
- Brightness override used in HDR mode. Default is
-1 -1 -1 1, which means no change. 
Warning:The fourth digit must be positive. Otherwise all light will be sucked out of your map!
- BrightnessScaleHDR (_lightHDRscale) ([todo internal name (i)]) <float>
- Amount to scale the light by when compiling for HDR.
- SpreadAngle (SunSpreadAngle) ([todo internal name (i)]) <float>
- The angular extent of the light for casting soft shadows. Higher numbers are more diffuse. 5 is a good starting value.
- Pitch Yaw Roll (Y Z X) (angles) <QAngle>
- This entity's orientation in the world. Pitch is rotation around the Y axis, yaw is the rotation around the Z axis, roll is the rotation around the X axis.