diff --git a/homeassistant/components/deconz/light.py b/homeassistant/components/deconz/light.py
index bba868b9ea48..9080160c76fe 100644
--- a/homeassistant/components/deconz/light.py
+++ b/homeassistant/components/deconz/light.py
@@ -1,4 +1,7 @@
 """Support for deCONZ lights."""
+
+from pydeconz.light import Light
+
 from homeassistant.components.light import (
     ATTR_BRIGHTNESS,
     ATTR_COLOR_TEMP,
@@ -105,21 +108,22 @@ class DeconzBaseLight(DeconzDevice, LightEntity):
         super().__init__(device, gateway)
 
         self._features = 0
+        self.update_features(self._device)
 
-        if self._device.brightness is not None:
+    def update_features(self, device):
+        """Calculate supported features of device."""
+        if device.brightness is not None:
             self._features |= SUPPORT_BRIGHTNESS
             self._features |= SUPPORT_FLASH
             self._features |= SUPPORT_TRANSITION
 
-        if self._device.ct is not None:
+        if device.ct is not None:
             self._features |= SUPPORT_COLOR_TEMP
 
-        if self._device.xy is not None or (
-            self._device.hue is not None and self._device.sat is not None
-        ):
+        if device.xy is not None or (device.hue is not None and device.sat is not None):
             self._features |= SUPPORT_COLOR
 
-        if self._device.effect is not None:
+        if device.effect is not None:
             self._features |= SUPPORT_EFFECT
 
     @property
@@ -251,6 +255,11 @@ class DeconzGroup(DeconzBaseLight):
 
         super().__init__(device, gateway)
 
+        for light_id in device.lights:
+            light = gateway.api.lights[light_id]
+            if light.ZHATYPE == Light.ZHATYPE:
+                self.update_features(light)
+
     @property
     def unique_id(self):
         """Return a unique identifier for this device."""
diff --git a/tests/components/deconz/test_light.py b/tests/components/deconz/test_light.py
index 5935769d6e2b..20fb50247eeb 100644
--- a/tests/components/deconz/test_light.py
+++ b/tests/components/deconz/test_light.py
@@ -521,3 +521,62 @@ async def test_non_color_light_reports_color(hass):
     with pytest.raises(KeyError):
         assert hass.states.get("light.all").attributes[ATTR_COLOR_TEMP]
         assert hass.states.get("light.all").attributes[ATTR_HS_COLOR]
+
+
+async def test_verify_group_supported_features(hass):
+    """Test that group supported features reflect what included lights support."""
+    data = deepcopy(DECONZ_WEB_REQUEST)
+    data["groups"] = deepcopy(
+        {
+            "1": {
+                "id": "Group1",
+                "name": "group",
+                "type": "LightGroup",
+                "state": {"all_on": False, "any_on": True},
+                "action": {},
+                "scenes": [],
+                "lights": ["1", "2", "3"],
+            },
+        }
+    )
+    data["lights"] = deepcopy(
+        {
+            "1": {
+                "id": "light1",
+                "name": "Dimmable light",
+                "state": {"on": True, "bri": 255, "reachable": True},
+                "type": "Light",
+                "uniqueid": "00:00:00:00:00:00:00:01-00",
+            },
+            "2": {
+                "id": "light2",
+                "name": "Color light",
+                "state": {
+                    "on": True,
+                    "bri": 100,
+                    "colormode": "xy",
+                    "effect": "colorloop",
+                    "xy": (500, 500),
+                    "reachable": True,
+                },
+                "type": "Extended color light",
+                "uniqueid": "00:00:00:00:00:00:00:02-00",
+            },
+            "3": {
+                "ctmax": 454,
+                "ctmin": 155,
+                "id": "light3",
+                "name": "Tunable light",
+                "state": {"on": True, "colormode": "ct", "ct": 2500, "reachable": True},
+                "type": "Tunable white light",
+                "uniqueid": "00:00:00:00:00:00:00:03-00",
+            },
+        }
+    )
+    await setup_deconz_integration(hass, get_state_response=data)
+
+    assert len(hass.states.async_all()) == 4
+
+    group = hass.states.get("light.group")
+    assert group.state == STATE_ON
+    assert group.attributes[ATTR_SUPPORTED_FEATURES] == 63