diff --git a/homeassistant/components/light/__init__.py b/homeassistant/components/light/__init__.py
index 06b6829d31c49..107ed80b0ddd1 100644
--- a/homeassistant/components/light/__init__.py
+++ b/homeassistant/components/light/__init__.py
@@ -74,6 +74,20 @@
 COLOR_MODES_BRIGHTNESS = VALID_COLOR_MODES - {COLOR_MODE_ONOFF}
 COLOR_MODES_COLOR = {COLOR_MODE_HS, COLOR_MODE_RGB, COLOR_MODE_XY}
 
+
+def validate_supported_color_modes(color_modes):
+    """Validate the given color modes."""
+    color_modes = set(color_modes)
+    if (
+        not color_modes
+        or COLOR_MODE_UNKNOWN in color_modes
+        or (COLOR_MODE_BRIGHTNESS in color_modes and len(color_modes) > 1)
+        or (COLOR_MODE_ONOFF in color_modes and len(color_modes) > 1)
+    ):
+        raise vol.Error(f"Invalid supported_color_modes {sorted(color_modes)}")
+    return color_modes
+
+
 # Float that represents transition time in seconds to make change.
 ATTR_TRANSITION = "transition"
 
@@ -609,9 +623,16 @@ def capability_attributes(self):
         if supported_features & SUPPORT_EFFECT:
             data[ATTR_EFFECT_LIST] = self.effect_list
 
-        data[ATTR_SUPPORTED_COLOR_MODES] = sorted(
-            self._light_internal_supported_color_modes
-        )
+        supported_color_modes = self._light_internal_supported_color_modes
+        try:
+            supported_color_modes = validate_supported_color_modes(
+                supported_color_modes
+            )
+        except vol.Error as ex:
+            _LOGGER.warning("Light %s: %s", self.entity_id, ex)
+            supported_color_modes = {COLOR_MODE_ONOFF}
+
+        data[ATTR_SUPPORTED_COLOR_MODES] = sorted(supported_color_modes)
 
         return data
 
diff --git a/tests/components/light/test_init.py b/tests/components/light/test_init.py
index 3adb146a22515..c77974796937f 100644
--- a/tests/components/light/test_init.py
+++ b/tests/components/light/test_init.py
@@ -1099,6 +1099,57 @@ async def test_light_backwards_compatibility_color_mode(hass):
     assert state.attributes["color_mode"] == light.COLOR_MODE_HS
 
 
+async def test_invalid_color_modes(hass, caplog):
+    """Test invalid combinations of color modes."""
+    platform = getattr(hass.components, "test.light")
+    platform.init(empty=True)
+
+    platform.ENTITIES.append(platform.MockLight("Test_0", STATE_ON))
+    platform.ENTITIES.append(platform.MockLight("Test_1", STATE_ON))
+    platform.ENTITIES.append(platform.MockLight("Test_2", STATE_ON))
+    platform.ENTITIES.append(platform.MockLight("Test_3", STATE_ON))
+
+    entity0 = platform.ENTITIES[0]
+    entity0.supported_color_modes = []
+
+    entity1 = platform.ENTITIES[1]
+    entity1.supported_color_modes = [light.COLOR_MODE_ONOFF, light.COLOR_MODE_RGB]
+
+    entity2 = platform.ENTITIES[2]
+    entity2.supported_color_modes = [light.COLOR_MODE_BRIGHTNESS, light.COLOR_MODE_RGB]
+
+    entity3 = platform.ENTITIES[3]
+    entity3.supported_color_modes = [light.COLOR_MODE_UNKNOWN]
+
+    assert await async_setup_component(hass, "light", {"light": {"platform": "test"}})
+    await hass.async_block_till_done()
+
+    assert "Light light.test_0: Invalid supported_color_modes []" in caplog.text
+    assert (
+        "Light light.test_1: Invalid supported_color_modes ['onoff', 'rgb']"
+        in caplog.text
+    )
+    assert (
+        "Light light.test_2: Invalid supported_color_modes ['brightness', 'rgb']"
+        in caplog.text
+    )
+    assert (
+        "Light light.test_3: Invalid supported_color_modes ['unknown']" in caplog.text
+    )
+
+    state = hass.states.get(entity0.entity_id)
+    assert state.attributes["supported_color_modes"] == [light.COLOR_MODE_ONOFF]
+
+    state = hass.states.get(entity1.entity_id)
+    assert state.attributes["supported_color_modes"] == [light.COLOR_MODE_ONOFF]
+
+    state = hass.states.get(entity2.entity_id)
+    assert state.attributes["supported_color_modes"] == [light.COLOR_MODE_ONOFF]
+
+    state = hass.states.get(entity3.entity_id)
+    assert state.attributes["supported_color_modes"] == [light.COLOR_MODE_ONOFF]
+
+
 async def test_light_service_call_rgbw(hass):
     """Test backwards compatibility for rgbw functionality in service calls."""
     platform = getattr(hass.components, "test.light")