diff --git a/src/NeoPixelBusLg.h b/src/NeoPixelBusLg.h
index c27b0f8..9afaeee 100644
--- a/src/NeoPixelBusLg.h
+++ b/src/NeoPixelBusLg.h
@@ -74,9 +74,16 @@ public:
     protected:
         uint8_t _luminance;
 
-        void setLuminance(uint8_t luminance)
+        bool setLuminance(uint8_t luminance)
         {
-            _luminance = luminance;
+            bool different = (_luminance != luminance);
+
+            if (different)
+            {
+                _luminance = luminance;
+            }
+            
+            return different;
         }
 
         uint8_t getLuminance() const
@@ -135,7 +142,10 @@ public:
         // does NOT affect current pixel data as there is no safe way
         // to reconstruct the original color values after being
         // modified with both luminance and gamma without storing them
-        Shader.setLuminance(luminance);
+        if (Shader.setLuminance(luminance))
+        {
+            this->Dirty();
+        }
     }
 
     uint8_t GetLuminance() const