diff --git a/smx-config/Helpers.cs b/smx-config/Helpers.cs
index aab0853..590d52a 100644
--- a/smx-config/Helpers.cs
+++ b/smx-config/Helpers.cs
@@ -518,7 +518,7 @@ namespace smx_config
                     color = config.stepColor;
                 for( int iPanel = 0; iPanel < 9; ++iPanel )
                 {
-                    for( int i = 0; i < 16; ++i )
+                    for( int i = 0; i < 25; ++i )
                     {
                         // Auto-lights colors in the config packet are scaled so the firmware
                         // doesn't have to do it, but here we're setting the panel color to
@@ -531,7 +531,7 @@ namespace smx_config
                 }
             }
 
-            SMX.SMX.SetLights(cmd.Get());
+            SMX.SMX.SetLights2(cmd.Get());
         }
     };
 
diff --git a/smx-config/SMX.cs b/smx-config/SMX.cs
index 60ec7be..c2bbecd 100644
--- a/smx-config/SMX.cs
+++ b/smx-config/SMX.cs
@@ -273,7 +273,7 @@ namespace SMX
         [DllImport("SMX.dll", CallingConvention = CallingConvention.Cdecl)]
         private static extern bool SMX_GetTestData(int pad, out SMXSensorTestModeData data);
         [DllImport("SMX.dll", CallingConvention = CallingConvention.Cdecl)]
-        private static extern bool SMX_SetLights(byte[] buf);
+        private static extern bool SMX_SetLights2(byte[] buf, int lightDataSize);
         [DllImport("SMX.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
         private static extern IntPtr SMX_Version();
 
@@ -441,13 +441,11 @@ namespace SMX
             SMX_ForceRecalibration(pad);
         }
 
-        public static void SetLights(byte[] buf)
+        public static void SetLights2(byte[] buf)
         {
             if(!DLLAvailable()) return;
 
-            if(buf.Length != 9*16*3*2)
-                throw new Exception("SetLights buffer has an invalid length: " + buf.Length);
-            SMX_SetLights(buf);
+            SMX_SetLights2(buf, buf.Length);
         }
 
         // SMXPanelAnimation