light_deferred_global
light_deferred_global is a point entity available in the following 
Source games or engine branches:
Alien Swarm Deferred and 
Lambda Wars.
…
It is also available in other games that use it's source code.
It creates real-time shadows and lighting coming from the sun. Similar to env_cascade_light. While this entity can be edited in Hammer, it's preferable to use the games light editor as you can see what you are doing.
In code, it is represented by theCDeferredLightGlobalclass, defined in theCDefLightGlobal.cppfile.
Confirm:Does this entity also exists in 
Portal 2: Desolation?Keyvalues
Light
- Fade interval time
(fadetime)<float> 
Todo: What does this do?
Base
- Name
(targetname)<string> - The name that other entities use to refer to this entity.
- Pitch Yaw Roll
(X Y Z)<angle> - 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.
Flags
- [
1] : Enabled
Turns the light on.
- [
2] : Enable shadow
Enables dynamic shadows.
- [
4] : Enable transitionsTodo: what does this do?
Inputs
Base:
AddContext<string>- Adds to the entity's list of response contexts. See Context.
AddOutput<string>- Assigns a new keyvalue/output on this entity. For keyvalues, some rely on extra necessary code to be ran and won't work if its simply just changed through this input. There is a strict format that must be followed:
// Format of changing KeyValues: "AddOutput [key] [value]"
//// Raw text:
"OnUser1" "!self,AddOutput,targetname new_name"
// Format of adding an Output: "AddOutput {targetname}:{inputname}:{parameter}:{delay}:{max times to fire, -1 means infinite}"
//// Raw text:
"OnUser1" "!self,AddOutput,OnUser1:SetParent:!activator:0.0:-1"
// Arguments can be left blank, but the empty blank should still be contained.
//// Raw text:
"OnUser1" "!self,AddOutput,OnUser1:ClearParent::0.0:-1"
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ClearContext- Removes all contexts from this entity's list.
ClearParent- Removes this entity from the the movement hierarchy, leaving it free to move independently.
FireUser1toFireUser4- Fires the respective
OnUseroutputs; see User Inputs and Outputs.
Kill- Removes this entity and any entities parented to it from the world.
KillHierarchy- Functions the same as
Kill, although this entity and any entities parented to it are killed on the same frame, being marginally faster thanKillinput.
RemoveContext<string>- Remove a context from this entity's list. The name should match the key of an existing context.
SetParent<string>- Move with this entity. See Entity Hierarchy (parenting).
SetParentAttachment<string>- Change this entity to attach to a specific attachment point on its parent. The entity will teleport so that the position of its root bone matches that of the attachment. Entities must be parented before being sent this input.
SetParentAttachmentMaintainOffset<string>- As above, but without teleporting. The entity retains its position relative to the attachment at the time of the input being received.
Outputs
Base:
OnUser1toOnUser4- These outputs each fire in response to the firing of the like-numbered
FireUser1toFireUser4Input; see User Inputs and Outputs.
