diff --git a/pyfritzhome/devicetypes/fritzhomedevicelightbulb.py b/pyfritzhome/devicetypes/fritzhomedevicelightbulb.py
index 2dbe4aa..6b31010 100644
--- a/pyfritzhome/devicetypes/fritzhomedevicelightbulb.py
+++ b/pyfritzhome/devicetypes/fritzhomedevicelightbulb.py
@@ -1,4 +1,5 @@
 """The light bulb device class."""
+
 # -*- coding: utf-8 -*-
 
 import logging
@@ -20,6 +21,7 @@ class FritzhomeDeviceLightBulb(FritzhomeDeviceBase):
     color_temp = None
     color_mode = None
     supported_color_mode = None
+    fullcolorsupport: bool = False
 
     def _update_from_node(self, node):
         super()._update_from_node(node)
@@ -58,6 +60,10 @@ def _update_lightbulb_from_node(self, node):
                     "supported_modes"
                 )
 
+                self.fullcolorsupport = bool(
+                    colorcontrol_element.attrib.get("fullcolorsupport")
+                )
+
             except ValueError:
                 pass
 
@@ -120,7 +126,7 @@ def set_color(self, hsv, duration=0, wait=False):
 
     def set_unmapped_color(self, hsv, duration=0, wait=False):
         """Set unmapped HSV color (Free color selection)."""
-        if self.has_color:
+        if self.has_color and self.fullcolorsupport:
             self._fritz.set_color(self.ain, hsv, duration, False, wait)
 
     def get_color_temps(self):
diff --git a/pyfritzhome/fritzhome.py b/pyfritzhome/fritzhome.py
index 43e1b51..da1972b 100644
--- a/pyfritzhome/fritzhome.py
+++ b/pyfritzhome/fritzhome.py
@@ -396,7 +396,7 @@ def set_color(self, ain, hsv, duration=0, mapped=True, wait=False):
         if mapped:
             self._aha_request("setcolor", ain=ain, param=params)
         else:
-            # undocumented API method for free color selection
+            # available since Fritz!OS 7.39
             self._aha_request("setunmappedcolor", ain=ain, param=params)
         wait and self.wait_device_txbusy(ain)
 
diff --git a/tests/test_fritzhomedevicelightbulb.py b/tests/test_fritzhomedevicelightbulb.py
index e7ec5c6..f5a4ea5 100644
--- a/tests/test_fritzhomedevicelightbulb.py
+++ b/tests/test_fritzhomedevicelightbulb.py
@@ -38,6 +38,7 @@ def test_device_init(self):
         assert device.state  # Lightbulb is switched on
         assert device.color_mode == "1"
         assert device.supported_color_mode == "5"
+        assert device.fullcolorsupport
         assert device.hue == 358
         assert device.saturation == 180
         assert device.color_temp is None
@@ -66,6 +67,7 @@ def test_device_init_non_color_bulb(self):
         device = self.fritz.get_device_by_ain("12701 0072784-1")
         assert device.has_lightbulb
         assert device.has_level
+        assert not device.fullcolorsupport
         assert device.state  # Lightbulb is switched on
         assert device.name == "Telekom White Dimmable Bulb"
 
@@ -87,6 +89,7 @@ def test_device_init_color_temp_mode(self):
         assert device.state  # Lightbulb is switched on
         assert device.color_mode == "4"
         assert device.supported_color_mode == "5"
+        assert device.fullcolorsupport
         assert device.hue is None
         assert device.saturation is None
         assert device.color_temp == 2800