diff --git a/bundles/org.openhab.binding.deconz/src/main/java/org/openhab/binding/deconz/internal/handler/GroupThingHandler.java b/bundles/org.openhab.binding.deconz/src/main/java/org/openhab/binding/deconz/internal/handler/GroupThingHandler.java
index 1d3c85b0e3472..62f9977ca40e0 100644
--- a/bundles/org.openhab.binding.deconz/src/main/java/org/openhab/binding/deconz/internal/handler/GroupThingHandler.java
+++ b/bundles/org.openhab.binding.deconz/src/main/java/org/openhab/binding/deconz/internal/handler/GroupThingHandler.java
@@ -14,7 +14,6 @@
 
 import static org.openhab.binding.deconz.internal.BindingConstants.*;
 import static org.openhab.binding.deconz.internal.Util.constrainToRange;
-import static org.openhab.binding.deconz.internal.Util.kelvinToMired;
 
 import java.util.Collection;
 import java.util.Map;
@@ -36,7 +35,9 @@
 import org.openhab.core.library.types.HSBType;
 import org.openhab.core.library.types.OnOffType;
 import org.openhab.core.library.types.PercentType;
+import org.openhab.core.library.types.QuantityType;
 import org.openhab.core.library.types.StringType;
+import org.openhab.core.library.unit.Units;
 import org.openhab.core.thing.Channel;
 import org.openhab.core.thing.ChannelUID;
 import org.openhab.core.thing.Thing;
@@ -139,9 +140,15 @@ public void handleCommand(ChannelUID channelUID, Command command) {
                 }
             }
             case CHANNEL_COLOR_TEMPERATURE -> {
-                if (command instanceof DecimalType decimalCommand) {
-                    int miredValue = kelvinToMired(decimalCommand.intValue());
-                    newGroupAction.ct = constrainToRange(miredValue, ZCL_CT_MIN, ZCL_CT_MAX);
+                QuantityType<?> miredQuantity = null;
+                if (command instanceof QuantityType<?> genericQuantity) {
+                    miredQuantity = genericQuantity.toInvertibleUnit(Units.MIRED);
+                } else if (command instanceof DecimalType decimal) {
+                    miredQuantity = QuantityType.valueOf(decimal.intValue(), Units.KELVIN)
+                            .toInvertibleUnit(Units.MIRED);
+                }
+                if (miredQuantity != null) {
+                    newGroupAction.ct = constrainToRange(miredQuantity.intValue(), ZCL_CT_MIN, ZCL_CT_MAX);
                     newGroupAction.on = true;
                 }
             }
diff --git a/bundles/org.openhab.binding.deconz/src/main/java/org/openhab/binding/deconz/internal/handler/LightThingHandler.java b/bundles/org.openhab.binding.deconz/src/main/java/org/openhab/binding/deconz/internal/handler/LightThingHandler.java
index 2e035dd1374d8..58c0e24eea2ab 100644
--- a/bundles/org.openhab.binding.deconz/src/main/java/org/openhab/binding/deconz/internal/handler/LightThingHandler.java
+++ b/bundles/org.openhab.binding.deconz/src/main/java/org/openhab/binding/deconz/internal/handler/LightThingHandler.java
@@ -245,9 +245,15 @@ public void handleCommand(ChannelUID channelUID, Command command) {
                 }
             }
             case CHANNEL_COLOR_TEMPERATURE -> {
-                if (command instanceof DecimalType) {
-                    int miredValue = kelvinToMired(((DecimalType) command).intValue());
-                    newLightState.ct = constrainToRange(miredValue, ctMin, ctMax);
+                QuantityType<?> miredQuantity = null;
+                if (command instanceof QuantityType<?> genericQuantity) {
+                    miredQuantity = genericQuantity.toInvertibleUnit(Units.MIRED);
+                } else if (command instanceof DecimalType decimal) {
+                    miredQuantity = QuantityType.valueOf(decimal.intValue(), Units.KELVIN)
+                            .toInvertibleUnit(Units.MIRED);
+                }
+                if (miredQuantity != null) {
+                    newLightState.ct = constrainToRange(miredQuantity.intValue(), ctMin, ctMax);
                     newLightState.on = true;
                 }
             }