diff --git a/components/esm4/loadligh.cpp b/components/esm4/loadligh.cpp
index a0d467bafc..32432c97e1 100644
--- a/components/esm4/loadligh.cpp
+++ b/components/esm4/loadligh.cpp
@@ -48,7 +48,11 @@ void ESM4::Light::load(ESM4::Reader& reader)
                 break;
             case ESM::fourCC("DATA"):
             {
-                if (subHdr.dataSize != 32 && subHdr.dataSize != 48 && subHdr.dataSize != 64)
+                // 24: older TES4 records (found in GOG release)
+                // 32: newer TES4 records, FO3/FNV
+                // 48: TES5
+                // 64: FO4/FO76
+                if (subHdr.dataSize != 24 && subHdr.dataSize != 32 && subHdr.dataSize != 48 && subHdr.dataSize != 64)
                 {
                     reader.skipSubRecordData();
                     break;
@@ -57,21 +61,23 @@ void ESM4::Light::load(ESM4::Reader& reader)
                 reader.get(mData.radius);
                 reader.get(mData.colour);
                 reader.get(mData.flags);
-                reader.get(mData.falloff);
-                reader.get(mData.FOV);
-                // TES5, FO4
-                if (subHdr.dataSize >= 48)
+                if (subHdr.dataSize >= 32)
                 {
-                    reader.get(mData.nearClip);
-                    reader.get(mData.frequency);
-                    reader.get(mData.intensityAmplitude);
-                    reader.get(mData.movementAmplitude);
-                    if (subHdr.dataSize == 64)
+                    reader.get(mData.falloff);
+                    reader.get(mData.FOV);
+                    if (subHdr.dataSize >= 48)
                     {
-                        reader.get(mData.constant);
-                        reader.get(mData.scalar);
-                        reader.get(mData.exponent);
-                        reader.get(mData.godRaysNearClip);
+                        reader.get(mData.nearClip);
+                        reader.get(mData.frequency);
+                        reader.get(mData.intensityAmplitude);
+                        reader.get(mData.movementAmplitude);
+                        if (subHdr.dataSize == 64)
+                        {
+                            reader.get(mData.constant);
+                            reader.get(mData.scalar);
+                            reader.get(mData.exponent);
+                            reader.get(mData.godRaysNearClip);
+                        }
                     }
                 }
                 reader.get(mData.value);
diff --git a/components/esm4/loadligh.hpp b/components/esm4/loadligh.hpp
index 5845f3769a..8fc59b7687 100644
--- a/components/esm4/loadligh.hpp
+++ b/components/esm4/loadligh.hpp
@@ -56,9 +56,9 @@ namespace ESM4
 
         struct Data
         {
-            std::int32_t time;
-            std::uint32_t radius;
-            std::uint32_t colour; // RGBA
+            std::int32_t time = 0;
+            std::uint32_t radius = 0;
+            std::uint32_t colour = 0; // RGBA
             // flags:
             // 0x00000001 = Dynamic
             // 0x00000002 = Can be Carried
@@ -70,19 +70,19 @@ namespace ESM4
             // 0x00000100 = Pulse Slow
             // 0x00000200 = Spot Light
             // 0x00000400 = Spot Shadow
-            std::int32_t flags;
+            std::int32_t flags = 0;
             float falloff = 1.f;
             float FOV = 90; // FIXME: FOV in degrees or radians?
-            float nearClip; // TES5+
-            float frequency; // TES5+
-            float intensityAmplitude; // TES5+
-            float movementAmplitude; // TES5+
-            float constant; // FO4
-            float scalar; // FO4
-            float exponent; // FO4
-            float godRaysNearClip; // FO4
-            std::uint32_t value; // gold
-            float weight;
+            float nearClip = 0.f; // TES5+
+            float frequency = 0.f; // TES5+
+            float intensityAmplitude = 0.f; // TES5+
+            float movementAmplitude = 0.f; // TES5+
+            float constant = 0.f; // FO4
+            float scalar = 0.f; // FO4
+            float exponent = 0.f; // FO4
+            float godRaysNearClip = 0.f; // FO4
+            std::uint32_t value = 0; // gold
+            float weight = 0.f;
         };
 
         ESM::FormId mId; // from the header