diff --git a/homeassistant/components/wiz/number.py b/homeassistant/components/wiz/number.py
index 5ac86fccede..cd5ee7cef83 100644
--- a/homeassistant/components/wiz/number.py
+++ b/homeassistant/components/wiz/number.py
@@ -26,6 +26,9 @@ class WizNumberEntityDescription(NumberEntityDescription):
     required_feature: str
     set_value_fn: Callable[[wizlight, int], Coroutine[None, None, None]]
     value_fn: Callable[[wizlight], int | None]
+    # Optional fallback, checked against runtime state when required_feature is
+    # not advertised by the bulb type.
+    supported_fn: Callable[[wizlight], bool] | None = None
 
 
 async def _async_set_speed(device: wizlight, speed: int) -> None:
@@ -57,11 +60,30 @@ NUMBERS: tuple[WizNumberEntityDescription, ...] = (
         value_fn=lambda device: cast(int | None, device.state.get_ratio()),
         set_value_fn=_async_set_ratio,
         required_feature="dual_head",
+        # Some ratio-based dual-head lights do not advertise this feature.
+        supported_fn=lambda device: (
+            device.state is not None and device.state.get_ratio() is not None
+        ),
         entity_category=EntityCategory.CONFIG,
     ),
 )
 
 
+def _supports_number_description(
+    device: wizlight, description: WizNumberEntityDescription
+) -> bool:
+    """Return whether the device supports a number description.
+
+    When the bulb type does not advertise the required feature, ``supported_fn``
+    is evaluated as a fallback. It inspects the current runtime state (e.g.
+    whether a ratio is present), so the result depends on the device state at
+    call time.
+    """
+    return getattr(device.bulbtype.features, description.required_feature, False) or (
+        description.supported_fn is not None and description.supported_fn(device)
+    )
+
+
 async def async_setup_entry(
     hass: HomeAssistant,
     entry: WizConfigEntry,
@@ -71,9 +93,7 @@ async def async_setup_entry(
     async_add_entities(
         WizSpeedNumber(entry.runtime_data, entry.title, description)
         for description in NUMBERS
-        if getattr(
-            entry.runtime_data.bulb.bulbtype.features, description.required_feature
-        )
+        if _supports_number_description(entry.runtime_data.bulb, description)
     )
 
 
diff --git a/tests/components/wiz/test_number.py b/tests/components/wiz/test_number.py
index 6bbbdd559cc..e09073a4cad 100644
--- a/tests/components/wiz/test_number.py
+++ b/tests/components/wiz/test_number.py
@@ -1,10 +1,13 @@
 """Tests for the number platform."""
 
+from pywizlight import PilotParser
+
 from homeassistant.components.number import (
     ATTR_VALUE,
     DOMAIN as NUMBER_DOMAIN,
     SERVICE_SET_VALUE,
 )
+from homeassistant.components.wiz.const import DOMAIN
 from homeassistant.const import ATTR_ENTITY_ID, STATE_UNAVAILABLE
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers import entity_registry as er
@@ -12,11 +15,27 @@ from homeassistant.helpers import entity_registry as er
 from . import (
     FAKE_DUAL_HEAD_RGBWW_BULB,
     FAKE_MAC,
+    FAKE_TURNABLE_BULB,
+    _mocked_wizlight,
     async_push_update,
     async_setup_integration,
 )
 
 
+async def test_ratio_not_created_without_ratio(
+    hass: HomeAssistant, entity_registry: er.EntityRegistry
+) -> None:
+    """Test the ratio entity is not created for lights that report no ratio."""
+    await async_setup_integration(hass, bulb_type=FAKE_TURNABLE_BULB)
+
+    assert (
+        entity_registry.async_get_entity_id(
+            NUMBER_DOMAIN, DOMAIN, f"{FAKE_MAC}_dual_head_ratio"
+        )
+        is None
+    )
+
+
 async def test_speed_operation(
     hass: HomeAssistant, entity_registry: er.EntityRegistry
 ) -> None:
@@ -47,10 +66,10 @@ async def test_ratio_operation(
     """Test changing a dual head ratio."""
     bulb, _ = await async_setup_integration(hass, bulb_type=FAKE_DUAL_HEAD_RGBWW_BULB)
     await async_push_update(hass, bulb, {"mac": FAKE_MAC})
-    entity_id = "number.mock_title_dual_head_ratio"
-    assert (
-        entity_registry.async_get(entity_id).unique_id == f"{FAKE_MAC}_dual_head_ratio"
+    entity_id = entity_registry.async_get_entity_id(
+        NUMBER_DOMAIN, DOMAIN, f"{FAKE_MAC}_dual_head_ratio"
     )
+    assert entity_id is not None
     assert hass.states.get(entity_id).state == STATE_UNAVAILABLE
 
     await async_push_update(hass, bulb, {"mac": FAKE_MAC, "ratio": 50})
@@ -65,3 +84,36 @@ async def test_ratio_operation(
     bulb.set_ratio.assert_called_with(30)
     await async_push_update(hass, bulb, {"mac": FAKE_MAC, "ratio": 30})
     assert hass.states.get(entity_id).state == "30.0"
+
+
+async def test_ratio_operation_without_dual_head_feature(
+    hass: HomeAssistant, entity_registry: er.EntityRegistry
+) -> None:
+    """Test changing a ratio reported by a light with an unadvertised dual head feature."""
+    bulb = _mocked_wizlight(None, None, FAKE_TURNABLE_BULB)
+    bulb.state = None
+
+    async def _update_state() -> PilotParser:
+        bulb.state = PilotParser({"mac": FAKE_MAC, "ratio": 50})
+        return bulb.state
+
+    bulb.updateState.side_effect = _update_state
+
+    await async_setup_integration(hass, wizlight=bulb)
+
+    bulb.updateState.assert_called_once()
+    entity_id = entity_registry.async_get_entity_id(
+        NUMBER_DOMAIN, DOMAIN, f"{FAKE_MAC}_dual_head_ratio"
+    )
+    assert entity_id is not None
+    assert hass.states.get(entity_id).state == "50.0"
+
+    await hass.services.async_call(
+        NUMBER_DOMAIN,
+        SERVICE_SET_VALUE,
+        {ATTR_ENTITY_ID: entity_id, ATTR_VALUE: 30},
+        blocking=True,
+    )
+    bulb.set_ratio.assert_called_with(30)
+    await async_push_update(hass, bulb, {"mac": FAKE_MAC, "ratio": 30})
+    assert hass.states.get(entity_id).state == "30.0"