diff --git a/homeassistant/components/plugwise/const.py b/homeassistant/components/plugwise/const.py
index c1f759622fa..dd13e0e5092 100644
--- a/homeassistant/components/plugwise/const.py
+++ b/homeassistant/components/plugwise/const.py
@@ -20,7 +20,6 @@ PW_TYPE: Final = "plugwise_type"
 SMILE: Final = "smile"
 STRETCH: Final = "stretch"
 STRETCH_USERNAME: Final = "stretch"
-UNIT_LUMEN: Final = "lm"
 
 PLATFORMS_GATEWAY: Final[list[str]] = [
     Platform.BINARY_SENSOR,
diff --git a/homeassistant/components/plugwise/sensor.py b/homeassistant/components/plugwise/sensor.py
index 91fd32c92c2..51cf27a2591 100644
--- a/homeassistant/components/plugwise/sensor.py
+++ b/homeassistant/components/plugwise/sensor.py
@@ -9,6 +9,7 @@ from homeassistant.components.sensor import (
 )
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (
+    LIGHT_LUX,
     PERCENTAGE,
     UnitOfEnergy,
     UnitOfPower,
@@ -20,7 +21,7 @@ from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity import EntityCategory
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
-from .const import DOMAIN, UNIT_LUMEN
+from .const import DOMAIN
 from .coordinator import PlugwiseDataUpdateCoordinator
 from .entity import PlugwiseEntity
 
@@ -257,7 +258,8 @@ SENSORS: tuple[SensorEntityDescription, ...] = (
     SensorEntityDescription(
         key="illuminance",
         name="Illuminance",
-        native_unit_of_measurement=UNIT_LUMEN,
+        native_unit_of_measurement=LIGHT_LUX,
+        device_class=SensorDeviceClass.ILLUMINANCE,
         state_class=SensorStateClass.MEASUREMENT,
     ),
     SensorEntityDescription(