diff --git a/src/knx/dpt.h b/src/knx/dpt.h
index 5fc45fe..f6dcef3 100644
--- a/src/knx/dpt.h
+++ b/src/knx/dpt.h
@@ -357,6 +357,7 @@
 #define DPT_FlaggedScaling Dpt(239, 1)
 #define DPT_CombinedPosition Dpt(240, 800)
 #define DPT_StatusSAB Dpt(241, 800)
+#define DPT_Colour_RGBW Dpt(251, 600)
 
 class Dpt
 {
diff --git a/src/knx/dptconvert.cpp b/src/knx/dptconvert.cpp
index 9942f0a..16dc9e3 100644
--- a/src/knx/dptconvert.cpp
+++ b/src/knx/dptconvert.cpp
@@ -126,6 +126,9 @@ int KNX_Decode_Value(uint8_t* payload, size_t payload_length, const Dpt& datatyp
         // DPT 239.* - Flagged Scaling
         if (datatype.mainGroup == 239 && datatype.subGroup == 1 && datatype.index <= 1)
             return busValueToFlaggedScaling(payload, payload_length, datatype, value);
+        // DPT 251.600 - RGBW
+        if (datatype.mainGroup == 251 && datatype.subGroup == 600 && datatype.index <= 1)
+            return busValueToRGBW(payload, payload_length, datatype, value);
     }
     return false;
 }
@@ -243,6 +246,9 @@ int KNX_Encode_Value(const KNXValue& value, uint8_t* payload, size_t payload_len
     // DPT 239.* - Flagged Scaling
     if (datatype.mainGroup == 239 && datatype.subGroup == 1 && datatype.index <= 1)
         return valueToBusValueFlaggedScaling(value, payload, payload_length, datatype);
+    // DPT 251.600 - RGBW
+    if (datatype.mainGroup == 251 && datatype.subGroup == 600 && datatype.index <= 1)
+        return valueToBusValueRGBW(value, payload, payload_length, datatype);
     return false;
 }
 
@@ -801,6 +807,24 @@ int busValueToRGB(const uint8_t* payload, size_t payload_length, const Dpt& data
     return true;
 }
 
+int busValueToRGBW(const uint8_t* payload, size_t payload_length, const Dpt& datatype, KNXValue& value)
+{
+    ASSERT_PAYLOAD(6);
+    switch (datatype.index) {
+        case 0: // The RGBW value
+            {
+                uint32_t rgbw = (unsigned32FromPayload(payload, 0) >> 8)
+                                + (unsigned8FromPayload(payload, 3) << 24);
+                value = rgbw;
+            }
+            return true;
+        case 1: // The mask bits only
+            value = unsigned8FromPayload(payload,5); 
+            return true;
+    }
+    return false;
+}
+
 int busValueToFlaggedScaling(const uint8_t* payload, size_t payload_length, const Dpt& datatype, KNXValue& value)
 {
     ASSERT_PAYLOAD(2);
@@ -1517,6 +1541,26 @@ int valueToBusValueRGB(const KNXValue& value, uint8_t* payload, size_t payload_l
     return true;
 }
 
+int valueToBusValueRGBW(const KNXValue& value, uint8_t* payload, size_t payload_length, const Dpt& datatype)
+{
+    switch(datatype.index)
+    {
+        case 0: // RGBW
+            {
+                uint32_t rgbw = (uint32_t)value;
+                unsigned16ToPayload(payload, payload_length, 0, rgbw >> 8, 0xffff); // RG
+                unsigned8ToPayload(payload, payload_length, 2, rgbw, 0xff); // B
+                unsigned8ToPayload(payload, payload_length, 3, rgbw >> 24, 0xff);  // W
+            }
+            break;
+        case 1: // Mask bits
+            unsigned8ToPayload(payload, payload_length, 5, (uint8_t)value, 0xff);
+            break;
+
+    }
+    return true;
+}
+
 int valueToBusValueFlaggedScaling(const KNXValue& value, uint8_t* payload, size_t payload_length, const Dpt& datatype)
 {
     switch (datatype.index)
@@ -1545,7 +1589,6 @@ int valueToBusValueActiveEnergy(const KNXValue& value, uint8_t* payload, size_t
     {
         case 0:
         {
-
             if ((int64_t)value < INT64_C(-2147483648) || (int64_t)value > INT64_C(2147483647))
                 return false;
             ENSURE_PAYLOAD(6);
diff --git a/src/knx/dptconvert.h b/src/knx/dptconvert.h
index 9256b51..f341df8 100644
--- a/src/knx/dptconvert.h
+++ b/src/knx/dptconvert.h
@@ -78,6 +78,7 @@ int busValueToScaling(const uint8_t* payload, size_t payload_length, const Dpt&
 int busValueToTariff(const uint8_t* payload, size_t payload_length, const Dpt& datatype, KNXValue& value);
 int busValueToLocale(const uint8_t* payload, size_t payload_length, const Dpt& datatype, KNXValue& value);
 int busValueToRGB(const uint8_t* payload, size_t payload_length, const Dpt& datatype, KNXValue& value);
+int busValueToRGBW(const uint8_t* payload, size_t payload_length, const Dpt& datatype, KNXValue& value);
 int busValueToFlaggedScaling(const uint8_t* payload, size_t payload_length, const Dpt& datatype, KNXValue& value);
 int busValueToActiveEnergy(const uint8_t* payload, size_t payload_length, const Dpt& datatype, KNXValue& value);
 
@@ -116,6 +117,7 @@ int valueToBusValueScaling(const KNXValue& value, uint8_t* payload, size_t paylo
 int valueToBusValueTariff(const KNXValue& value, uint8_t* payload, size_t payload_length, const Dpt& datatype);
 int valueToBusValueLocale(const KNXValue& value, uint8_t* payload, size_t payload_length, const Dpt& datatype);
 int valueToBusValueRGB(const KNXValue& value, uint8_t* payload, size_t payload_length, const Dpt& datatype);
+int valueToBusValueRGBW(const KNXValue& value, uint8_t* payload, size_t payload_length, const Dpt& datatype);
 int valueToBusValueFlaggedScaling(const KNXValue& value, uint8_t* payload, size_t payload_length, const Dpt& datatype);
 int valueToBusValueActiveEnergy(const KNXValue& value, uint8_t* payload, size_t payload_length, const Dpt& datatype);