diff --git a/homeassistant/components/homewizard/number.py b/homeassistant/components/homewizard/number.py
index 58e0b02a06c..ced870d7072 100644
--- a/homeassistant/components/homewizard/number.py
+++ b/homeassistant/components/homewizard/number.py
@@ -6,6 +6,7 @@ from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import PERCENTAGE, EntityCategory
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.util.color import brightness_to_value, value_to_brightness
 
 from .const import DOMAIN
 from .coordinator import HWEnergyDeviceUpdateCoordinator
@@ -45,7 +46,9 @@ class HWEnergyNumberEntity(HomeWizardEntity, NumberEntity):
     @homewizard_exception_handler
     async def async_set_native_value(self, value: float) -> None:
         """Set a new value."""
-        await self.coordinator.api.state_set(brightness=int(value * (255 / 100)))
+        await self.coordinator.api.state_set(
+            brightness=value_to_brightness((0, 100), value)
+        )
         await self.coordinator.async_refresh()
 
     @property
@@ -61,4 +64,4 @@ class HWEnergyNumberEntity(HomeWizardEntity, NumberEntity):
             or (brightness := self.coordinator.data.state.brightness) is None
         ):
             return None
-        return round(brightness * (100 / 255))
+        return brightness_to_value((0, 100), brightness)
diff --git a/tests/components/homewizard/snapshots/test_number.ambr b/tests/components/homewizard/snapshots/test_number.ambr
index 436abc70ac1..5c7e71ea9ac 100644
--- a/tests/components/homewizard/snapshots/test_number.ambr
+++ b/tests/components/homewizard/snapshots/test_number.ambr
@@ -14,7 +14,7 @@
     'entity_id': 'number.device_status_light_brightness',
     'last_changed': <ANY>,
     'last_updated': <ANY>,
-    'state': '100',
+    'state': '100.0',
   })
 # ---
 # name: test_number_entities[HWE-SKT].1
diff --git a/tests/components/homewizard/test_number.py b/tests/components/homewizard/test_number.py
index 08154614833..a54f98899c6 100644
--- a/tests/components/homewizard/test_number.py
+++ b/tests/components/homewizard/test_number.py
@@ -41,7 +41,7 @@ async def test_number_entities(
     assert snapshot == device_entry
 
     # Test unknown handling
-    assert state.state == "100"
+    assert state.state == "100.0"
 
     mock_homewizardenergy.state.return_value.brightness = None
 
@@ -64,7 +64,7 @@ async def test_number_entities(
     )
 
     assert len(mock_homewizardenergy.state_set.mock_calls) == 1
-    mock_homewizardenergy.state_set.assert_called_with(brightness=127)
+    mock_homewizardenergy.state_set.assert_called_with(brightness=129)
 
     mock_homewizardenergy.state_set.side_effect = RequestError
     with pytest.raises(