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code/entities/LightEntity.cs

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+using Sandbox;
+
+[Library( "ent_light", Title = "Light", Spawnable = true )]
+public partial class LightEntity : PointLightEntity, IUse
+{
+	public override void Spawn()
+	{
+		base.Spawn();
+
+		SetModel( "models/light/light_tubular.vmdl" );
+		SetupPhysicsFromModel( PhysicsMotionType.Dynamic, false );
+	}
+
+	public bool IsUsable( Entity user )
+	{
+		return true;
+	}
+
+	public bool OnUse( Entity user )
+	{
+		Enabled = !Enabled;
+
+		PlaySound( Enabled ? "flashlight-on" : "flashlight-off" );
+
+		return false;
+	}
+
+	public void Remove()
+	{
+		PhysicsGroup?.Wake();
+		Delete();
+	}
+}