diff --git a/gazebo/rendering/Light.cc b/gazebo/rendering/Light.cc
index 9752bf9a00..4aa059217f 100644
--- a/gazebo/rendering/Light.cc
+++ b/gazebo/rendering/Light.cc
@@ -318,8 +318,8 @@ void Light::CreateVisual()
 
     double angles[2];
     double range = 0.2;
-    angles[0] = range * tan(outerAngle);
-    angles[1] = range * tan(innerAngle);
+    angles[0] = range * tan(outerAngle / 2);
+    angles[1] = range * tan(innerAngle / 2);
 
     unsigned int i = 0;
     this->dataPtr->line->AddPoint(ignition::math::Vector3d(0, 0, 0));