diff --git a/CodeWalker.Shaders/LightPS.hlsli b/CodeWalker.Shaders/LightPS.hlsli
index 95dff93..6866d9a 100644
--- a/CodeWalker.Shaders/LightPS.hlsli
+++ b/CodeWalker.Shaders/LightPS.hlsli
@@ -135,6 +135,9 @@ float4 DeferredLight(float3 camRel, float3 norm, float4 diffuse, float4 specular
     if (ldist > InstFalloff) return 0; //out of range of the light... TODO: capsules!
     if (ldist <= 0) return 0;
     
+    float d = dot(srpos, InstCullingPlaneNormal) - InstCullingPlaneOffset;
+    if (d > 0) return 0;
+    
     float4 rgbi = float4(InstColour, InstIntensity);
     float3 lcol = rgbi.rgb;// * rgbi.a; // * 5.0f;
     float3 ldir = srpos / ldist;
diff --git a/Shaders/LightPS.cso b/Shaders/LightPS.cso
index 9ae7e3b..a03653d 100644
Binary files a/Shaders/LightPS.cso and b/Shaders/LightPS.cso differ
diff --git a/Shaders/LightPS_MS.cso b/Shaders/LightPS_MS.cso
index 3ba9541..9e73d91 100644
Binary files a/Shaders/LightPS_MS.cso and b/Shaders/LightPS_MS.cso differ