diff --git a/homeassistant/components/deconz/light.py b/homeassistant/components/deconz/light.py
index 044c9bf203b..27038a07ac3 100644
--- a/homeassistant/components/deconz/light.py
+++ b/homeassistant/components/deconz/light.py
@@ -212,6 +212,10 @@ class DeconzBaseLight(DeconzDevice[_LightDeviceT], LightEntity):
             color_mode = ColorMode.BRIGHTNESS
         else:
             color_mode = ColorMode.ONOFF
+        if color_mode not in self._attr_supported_color_modes:
+            # Some lights controlled by ZigBee scenes can get unsupported color mode
+            return self._attr_color_mode
+        self._attr_color_mode = color_mode
         return color_mode
 
     @property
diff --git a/tests/components/deconz/test_light.py b/tests/components/deconz/test_light.py
index d38c65526c2..d1d5b983956 100644
--- a/tests/components/deconz/test_light.py
+++ b/tests/components/deconz/test_light.py
@@ -1179,9 +1179,19 @@ async def test_non_color_light_reports_color(
         await setup_deconz_integration(hass, aioclient_mock)
 
     assert len(hass.states.async_all()) == 3
+    assert hass.states.get("light.group").attributes[ATTR_SUPPORTED_COLOR_MODES] == [
+        ColorMode.COLOR_TEMP,
+        ColorMode.HS,
+        ColorMode.XY,
+    ]
+    assert (
+        hass.states.get("light.group").attributes[ATTR_COLOR_MODE]
+        == ColorMode.COLOR_TEMP
+    )
     assert hass.states.get("light.group").attributes[ATTR_COLOR_TEMP] == 250
 
-    # Updating a scene will return a faulty color value for a non-color light causing an exception in hs_color
+    # Updating a scene will return a faulty color value
+    # for a non-color light causing an exception in hs_color
     event_changed_light = {
         "e": "changed",
         "id": "1",
@@ -1200,7 +1210,9 @@ async def test_non_color_light_reports_color(
     await mock_deconz_websocket(data=event_changed_light)
     await hass.async_block_till_done()
 
-    # Bug is fixed if we reach this point, but device won't have neither color temp nor color
+    assert hass.states.get("light.group").attributes[ATTR_COLOR_MODE] == ColorMode.XY
+    # Bug is fixed if we reach this point
+    # device won't have neither color temp nor color
     with pytest.raises(AssertionError):
         assert hass.states.get("light.group").attributes.get(ATTR_COLOR_TEMP) is None
         assert hass.states.get("light.group").attributes.get(ATTR_HS_COLOR) is None