diff --git a/KeepersCompound.Lightmapper/Program.cs b/KeepersCompound.Lightmapper/Program.cs
index 77a46bf..13d3136 100644
--- a/KeepersCompound.Lightmapper/Program.cs
+++ b/KeepersCompound.Lightmapper/Program.cs
@@ -1,4 +1,4 @@
-using System.Numerics;
+using System.Numerics;
 using KeepersCompound.LGS.Database;
 using KeepersCompound.LGS.Database.Chunks;
 using TinyEmbree;
@@ -257,6 +257,15 @@ class Program
                         continue;
                     }
 
+                    // If there aren't *any* points on the plane that are in range of the light
+                    // then none of the lightmap points will be so we can discard.
+                    // The more compact a map is the less effective this is
+                    var planeDist = MathUtils.DistanceFromPlane(plane, light.position);
+                    if (planeDist > light.radius)
+                    {
+                        continue;
+                    }
+
                     for (var y = 0; y < lightmap.Height; y++)
                     {
                         for (var x = 0; x < lightmap.Width; x++)