diff --git a/include/vsg/nodes/Light.h b/include/vsg/nodes/Light.h
index a7d4c0d15..6c721892d 100644
--- a/include/vsg/nodes/Light.h
+++ b/include/vsg/nodes/Light.h
@@ -70,6 +70,7 @@ namespace vsg
         DirectionalLight(const DirectionalLight& rhs, const CopyOp& copyop = {});
 
         dvec3 direction = dvec3(0.0, 0.0, -1.0);
+        float angleSubtended = 0.0090f;
 
     public:
         ref_ptr<Object> clone(const CopyOp& copyop = {}) const override { return DirectionalLight::create(*this, copyop); }
diff --git a/src/vsg/nodes/Light.cpp b/src/vsg/nodes/Light.cpp
index 5b2d285c2..8e3b3e149 100644
--- a/src/vsg/nodes/Light.cpp
+++ b/src/vsg/nodes/Light.cpp
@@ -92,7 +92,8 @@ DirectionalLight::DirectionalLight()
 
 DirectionalLight::DirectionalLight(const DirectionalLight& rhs, const CopyOp& copyop) :
     Inherit(rhs, copyop),
-    direction(rhs.direction)
+    direction(rhs.direction),
+    angleSubtended(rhs.angleSubtended)
 {
 }
 
@@ -102,7 +103,8 @@ int DirectionalLight::compare(const Object& rhs_object) const
     if (result != 0) return result;
 
     auto& rhs = static_cast<decltype(*this)>(rhs_object);
-    return compare_value(direction, rhs.direction);
+    if ((result = compare_value(direction, rhs.direction)) != 0) return result;
+    return compare_value(angleSubtended, rhs.angleSubtended);
 }
 
 void DirectionalLight::read(Input& input)
@@ -110,6 +112,7 @@ void DirectionalLight::read(Input& input)
     Light::read(input);
 
     input.read("direction", direction);
+    input.read("angleSubtended", angleSubtended);
 }
 
 void DirectionalLight::write(Output& output) const
@@ -117,6 +120,7 @@ void DirectionalLight::write(Output& output) const
     Light::write(output);
 
     output.write("direction", direction);
+    output.write("angleSubtended", angleSubtended);
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
diff --git a/src/vsg/state/ViewDependentState.cpp b/src/vsg/state/ViewDependentState.cpp
index 205641c90..54352ed39 100644
--- a/src/vsg/state/ViewDependentState.cpp
+++ b/src/vsg/state/ViewDependentState.cpp
@@ -569,7 +569,7 @@ void ViewDependentState::traverse(RecordTraversal& rt) const
         (*light_itr++).set(static_cast<float>(eye_direction.x), static_cast<float>(eye_direction.y), static_cast<float>(eye_direction.z), 0.0f);
 
         uint32_t activeNumShadowMaps = std::min(light->shadowMaps, numShadowMaps - shadowMapIndex);
-        (*light_itr++).set(static_cast<float>(activeNumShadowMaps), 0.0f, 0.0f, 0.0f); // shadow map setting
+        (*light_itr++).set(static_cast<float>(activeNumShadowMaps), std::tan(light->angleSubtended / 2), 0.0f, 0.0f); // shadow map setting
 
         if (activeNumShadowMaps == 0) continue;