diff --git a/homeassistant/components/ambient_station/sensor.py b/homeassistant/components/ambient_station/sensor.py
index a849550a6ee..eb01fd379b2 100644
--- a/homeassistant/components/ambient_station/sensor.py
+++ b/homeassistant/components/ambient_station/sensor.py
@@ -592,7 +592,6 @@ SENSOR_DESCRIPTIONS = (
         key=TYPE_UV,
         name="UV index",
         native_unit_of_measurement="Index",
-        device_class=SensorDeviceClass.ILLUMINANCE,
         state_class=SensorStateClass.MEASUREMENT,
     ),
     SensorEntityDescription(
diff --git a/homeassistant/components/homekit/accessories.py b/homeassistant/components/homekit/accessories.py
index e91a710e4fe..adab539fb30 100644
--- a/homeassistant/components/homekit/accessories.py
+++ b/homeassistant/components/homekit/accessories.py
@@ -214,7 +214,7 @@ def get_accessory(  # noqa: C901
             a_type = "CarbonMonoxideSensor"
         elif device_class == SensorDeviceClass.CO2 or "co2" in state.entity_id:
             a_type = "CarbonDioxideSensor"
-        elif device_class == SensorDeviceClass.ILLUMINANCE or unit in ("lm", LIGHT_LUX):
+        elif device_class == SensorDeviceClass.ILLUMINANCE or unit == LIGHT_LUX:
             a_type = "LightSensor"
 
     elif state.domain == "switch":
diff --git a/homeassistant/components/number/__init__.py b/homeassistant/components/number/__init__.py
index 2f5ebc662a3..5a48d00d4da 100644
--- a/homeassistant/components/number/__init__.py
+++ b/homeassistant/components/number/__init__.py
@@ -143,7 +143,7 @@ class NumberDeviceClass(StrEnum):
     ILLUMINANCE = "illuminance"
     """Illuminance.
 
-    Unit of measurement: `lx`, `lm`
+    Unit of measurement: `lx`
     """
 
     IRRADIANCE = "irradiance"
diff --git a/homeassistant/components/plugwise/sensor.py b/homeassistant/components/plugwise/sensor.py
index d727d611d61..91fd32c92c2 100644
--- a/homeassistant/components/plugwise/sensor.py
+++ b/homeassistant/components/plugwise/sensor.py
@@ -258,7 +258,6 @@ SENSORS: tuple[SensorEntityDescription, ...] = (
         key="illuminance",
         name="Illuminance",
         native_unit_of_measurement=UNIT_LUMEN,
-        device_class=SensorDeviceClass.ILLUMINANCE,
         state_class=SensorStateClass.MEASUREMENT,
     ),
     SensorEntityDescription(
diff --git a/homeassistant/components/sensor/__init__.py b/homeassistant/components/sensor/__init__.py
index fc6f0b60815..9adc1f74cac 100644
--- a/homeassistant/components/sensor/__init__.py
+++ b/homeassistant/components/sensor/__init__.py
@@ -235,7 +235,7 @@ class SensorDeviceClass(StrEnum):
     ILLUMINANCE = "illuminance"
     """Illuminance.
 
-    Unit of measurement: `lx`, `lm`
+    Unit of measurement: `lx`
     """
 
     IRRADIANCE = "irradiance"
@@ -503,7 +503,7 @@ DEVICE_CLASS_UNITS: dict[SensorDeviceClass, set[type[StrEnum] | str | None]] = {
         UnitOfVolume.CUBIC_METERS,
     },
     SensorDeviceClass.HUMIDITY: {PERCENTAGE},
-    SensorDeviceClass.ILLUMINANCE: {LIGHT_LUX, "lm"},
+    SensorDeviceClass.ILLUMINANCE: {LIGHT_LUX},
     SensorDeviceClass.IRRADIANCE: set(UnitOfIrradiance),
     SensorDeviceClass.MOISTURE: {PERCENTAGE},
     SensorDeviceClass.NITROGEN_DIOXIDE: {CONCENTRATION_MICROGRAMS_PER_CUBIC_METER},
diff --git a/homeassistant/components/switchbot/sensor.py b/homeassistant/components/switchbot/sensor.py
index 342328d470e..f31f7486b72 100644
--- a/homeassistant/components/switchbot/sensor.py
+++ b/homeassistant/components/switchbot/sensor.py
@@ -57,7 +57,6 @@ SENSOR_TYPES: dict[str, SensorEntityDescription] = {
         name="Light level",
         native_unit_of_measurement="Level",
         state_class=SensorStateClass.MEASUREMENT,
-        device_class=SensorDeviceClass.ILLUMINANCE,
     ),
     "humidity": SensorEntityDescription(
         key="humidity",
diff --git a/homeassistant/components/tuya/const.py b/homeassistant/components/tuya/const.py
index 3d325ea48ee..75ccffce685 100644
--- a/homeassistant/components/tuya/const.py
+++ b/homeassistant/components/tuya/const.py
@@ -456,11 +456,6 @@ UNITS = (
         aliases={"lux"},
         device_classes={SensorDeviceClass.ILLUMINANCE},
     ),
-    UnitOfMeasurement(
-        unit="lm",
-        aliases={"lum", "lumen"},
-        device_classes={SensorDeviceClass.ILLUMINANCE},
-    ),
     UnitOfMeasurement(
         unit=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
         aliases={"ug/m3", "µg/m3", "ug/m³"},
diff --git a/homeassistant/components/xiaomi_aqara/sensor.py b/homeassistant/components/xiaomi_aqara/sensor.py
index 54ac3db120f..e114adaa8c4 100644
--- a/homeassistant/components/xiaomi_aqara/sensor.py
+++ b/homeassistant/components/xiaomi_aqara/sensor.py
@@ -42,7 +42,6 @@ SENSOR_TYPES: dict[str, SensorEntityDescription] = {
     "illumination": SensorEntityDescription(
         key="illumination",
         native_unit_of_measurement="lm",
-        device_class=SensorDeviceClass.ILLUMINANCE,
         state_class=SensorStateClass.MEASUREMENT,
     ),
     "lux": SensorEntityDescription(
diff --git a/homeassistant/components/xiaomi_miio/sensor.py b/homeassistant/components/xiaomi_miio/sensor.py
index 3630f3b807a..13344e5044a 100644
--- a/homeassistant/components/xiaomi_miio/sensor.py
+++ b/homeassistant/components/xiaomi_miio/sensor.py
@@ -246,7 +246,6 @@ SENSOR_TYPES = {
         key=ATTR_ILLUMINANCE,
         name="Illuminance",
         native_unit_of_measurement=UNIT_LUMEN,
-        device_class=SensorDeviceClass.ILLUMINANCE,
         state_class=SensorStateClass.MEASUREMENT,
     ),
     ATTR_ILLUMINANCE_LUX: XiaomiMiioSensorDescription(
diff --git a/tests/components/homekit/test_get_accessories.py b/tests/components/homekit/test_get_accessories.py
index 12113ada5cb..320407f480a 100644
--- a/tests/components/homekit/test_get_accessories.py
+++ b/tests/components/homekit/test_get_accessories.py
@@ -258,7 +258,6 @@ def test_type_media_player(type_name, entity_id, state, attrs, config):
             {ATTR_DEVICE_CLASS: "humidity", ATTR_UNIT_OF_MEASUREMENT: PERCENTAGE},
         ),
         ("LightSensor", "sensor.light", "900", {ATTR_DEVICE_CLASS: "illuminance"}),
-        ("LightSensor", "sensor.light", "900", {ATTR_UNIT_OF_MEASUREMENT: "lm"}),
         ("LightSensor", "sensor.light", "900", {ATTR_UNIT_OF_MEASUREMENT: LIGHT_LUX}),
         (
             "TemperatureSensor",
diff --git a/tests/testing_config/custom_components/test/sensor.py b/tests/testing_config/custom_components/test/sensor.py
index 9ec56ad23f6..9b3911313a6 100644
--- a/tests/testing_config/custom_components/test/sensor.py
+++ b/tests/testing_config/custom_components/test/sensor.py
@@ -13,6 +13,7 @@ from homeassistant.const import (
     CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
     CONCENTRATION_PARTS_PER_MILLION,
     FREQUENCY_GIGAHERTZ,
+    LIGHT_LUX,
     PERCENTAGE,
     POWER_VOLT_AMPERE,
     POWER_VOLT_AMPERE_REACTIVE,
@@ -31,7 +32,7 @@ UNITS_OF_MEASUREMENT = {
     SensorDeviceClass.CO: CONCENTRATION_PARTS_PER_MILLION,  # ppm of CO concentration
     SensorDeviceClass.CO2: CONCENTRATION_PARTS_PER_MILLION,  # ppm of CO2 concentration
     SensorDeviceClass.HUMIDITY: PERCENTAGE,  # % of humidity in the air
-    SensorDeviceClass.ILLUMINANCE: "lm",  # current light level (lx/lm)
+    SensorDeviceClass.ILLUMINANCE: LIGHT_LUX,  # current light level lx
     SensorDeviceClass.MOISTURE: PERCENTAGE,  # % of water in a substance
     SensorDeviceClass.NITROGEN_DIOXIDE: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # µg/m³ of nitrogen dioxide
     SensorDeviceClass.NITROGEN_MONOXIDE: CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,  # µg/m³ of nitrogen monoxide