diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9fa330e778..ed387eaf63 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -33,6 +33,7 @@
     Bug #3788: GetPCInJail and GetPCTraveling do not work as in vanilla
     Bug #3836: Script fails to compile when command argument contains "\n"
     Bug #3876: Landscape texture painting is misaligned
+    Bug #3890: Magic light source attenuation is inaccurate
     Bug #3897: Have Goodbye give all choices the effects of Goodbye
     Bug #3911: [macOS] Typing in the "Content List name" dialog box produces double characters
     Bug #3920: RemoveSpellEffects doesn't remove constant effects
diff --git a/apps/openmw/mwrender/animation.cpp b/apps/openmw/mwrender/animation.cpp
index f165b6bd3d..8463b7bfe5 100644
--- a/apps/openmw/mwrender/animation.cpp
+++ b/apps/openmw/mwrender/animation.cpp
@@ -15,13 +15,13 @@
 
 #include <components/debug/debuglog.hpp>
 
-#include <components/nifosg/nifloader.hpp>
-
 #include <components/resource/resourcesystem.hpp>
 #include <components/resource/scenemanager.hpp>
 #include <components/resource/keyframemanager.hpp>
 #include <components/resource/imagemanager.hpp>
 
+#include <components/misc/constants.hpp>
+
 #include <components/nifosg/nifloader.hpp> // KeyframeHolder
 #include <components/nifosg/controller.hpp>
 
@@ -1789,9 +1789,12 @@ namespace MWRender
         }
         else
         {
-            effect += 3;
-            float radius = effect * 66.f;
-            float linearAttenuation = 0.5f / effect;
+            // TODO: use global attenuation settings
+
+            // 1 pt of Light magnitude corresponds to 1 foot of radius
+            float radius = effect * std::ceil(Constants::UnitsPerFoot);
+            const float linearValue = 3.f; // Currently hardcoded: unmodified Morrowind attenuation settings
+            float linearAttenuation = linearValue / radius;
 
             if (!mGlowLight || linearAttenuation != mGlowLight->getLight(0)->getLinearAttenuation())
             {
@@ -1813,7 +1816,8 @@ namespace MWRender
                 mGlowLight->setLight(light);
             }
 
-            mGlowLight->setRadius(radius);
+            // Make the obvious cut-off a bit less obvious
+            mGlowLight->setRadius(radius * 3);
         }
     }