diff --git a/homeassistant/components/wiz/light.py b/homeassistant/components/wiz/light.py
index e38d518f6bc..509d40d654d 100644
--- a/homeassistant/components/wiz/light.py
+++ b/homeassistant/components/wiz/light.py
@@ -99,10 +99,13 @@ class WizBulbEntity(WizToggleEntity, LightEntity):
     def _async_update_attrs(self) -> None:
         """Handle updating _attr values."""
         state = self._device.state
-        color_modes = self.supported_color_modes
-        assert color_modes is not None
+
         if (brightness := state.get_brightness()) is not None:
             self._attr_brightness = max(0, min(255, brightness))
+
+        color_modes = self.supported_color_modes
+        assert color_modes is not None
+
         if ColorMode.COLOR_TEMP in color_modes and (
             color_temp := state.get_colortemp()
         ):
@@ -111,12 +114,19 @@ class WizBulbEntity(WizToggleEntity, LightEntity):
         elif (
             ColorMode.RGBWW in color_modes and (rgbww := state.get_rgbww()) is not None
         ):
-            self._attr_rgbww_color = rgbww
             self._attr_color_mode = ColorMode.RGBWW
+            self._attr_rgbww_color = rgbww
         elif ColorMode.RGBW in color_modes and (rgbw := state.get_rgbw()) is not None:
-            self._attr_rgbw_color = rgbw
             self._attr_color_mode = ColorMode.RGBW
-        self._attr_effect = state.get_scene()
+            self._attr_rgbw_color = rgbw
+
+        self._attr_effect = effect = state.get_scene()
+        if effect is not None:
+            if brightness is not None:
+                self._attr_color_mode = ColorMode.BRIGHTNESS
+            else:
+                self._attr_color_mode = ColorMode.ONOFF
+
         super()._async_update_attrs()
 
     async def async_turn_on(self, **kwargs: Any) -> None:
diff --git a/tests/components/wiz/test_light.py b/tests/components/wiz/test_light.py
index c49652825ad..be362585850 100644
--- a/tests/components/wiz/test_light.py
+++ b/tests/components/wiz/test_light.py
@@ -4,6 +4,7 @@ from pywizlight import PilotBuilder
 
 from homeassistant.components.light import (
     ATTR_BRIGHTNESS,
+    ATTR_COLOR_MODE,
     ATTR_COLOR_TEMP_KELVIN,
     ATTR_EFFECT,
     ATTR_RGBW_COLOR,
@@ -109,17 +110,35 @@ async def test_rgbww_light(hass: HomeAssistant) -> None:
     await hass.services.async_call(
         LIGHT_DOMAIN,
         SERVICE_TURN_ON,
-        {ATTR_ENTITY_ID: entity_id, ATTR_EFFECT: "Ocean"},
+        {ATTR_ENTITY_ID: entity_id, ATTR_EFFECT: "Ocean", ATTR_BRIGHTNESS: 128},
         blocking=True,
     )
     pilot: PilotBuilder = bulb.turn_on.mock_calls[0][1][0]
-    assert pilot.pilot_params == {"sceneId": 1}
+    assert pilot.pilot_params == {"dimming": 50, "sceneId": 1}
     await async_push_update(
         hass, bulb, {"mac": FAKE_MAC, "state": True, **pilot.pilot_params}
     )
     state = hass.states.get(entity_id)
     assert state.state == STATE_ON
     assert state.attributes[ATTR_EFFECT] == "Ocean"
+    assert state.attributes[ATTR_COLOR_MODE] == "brightness"
+
+    bulb.turn_on.reset_mock()
+    await hass.services.async_call(
+        LIGHT_DOMAIN,
+        SERVICE_TURN_ON,
+        {ATTR_ENTITY_ID: entity_id, ATTR_EFFECT: "Forest"},
+        blocking=True,
+    )
+    pilot: PilotBuilder = bulb.turn_on.mock_calls[0][1][0]
+    assert pilot.pilot_params == {"sceneId": 7}
+    await async_push_update(
+        hass, bulb, {"mac": FAKE_MAC, "state": True, **pilot.pilot_params}
+    )
+    state = hass.states.get(entity_id)
+    assert state.state == STATE_ON
+    assert state.attributes[ATTR_EFFECT] == "Forest"
+    assert state.attributes[ATTR_COLOR_MODE] == "onoff"
 
     bulb.turn_on.reset_mock()
     await hass.services.async_call(