diff --git a/homeassistant/components/lametric/number.py b/homeassistant/components/lametric/number.py
index c788eb3255e..e66b130b3e2 100644
--- a/homeassistant/components/lametric/number.py
+++ b/homeassistant/components/lametric/number.py
@@ -34,6 +34,18 @@ class LaMetricNumberEntityDescription(
 
 
 NUMBERS = [
+    LaMetricNumberEntityDescription(
+        key="brightness",
+        name="Brightness",
+        icon="mdi:brightness-6",
+        entity_category=EntityCategory.CONFIG,
+        native_step=1,
+        native_min_value=0,
+        native_max_value=100,
+        native_unit_of_measurement="%",
+        value_fn=lambda device: device.display.brightness,
+        set_value_fn=lambda device, bri: device.display(brightness=int(bri)),
+    ),
     LaMetricNumberEntityDescription(
         key="volume",
         name="Volume",
diff --git a/tests/components/lametric/test_number.py b/tests/components/lametric/test_number.py
index 92d4e262bdc..1acf939fc99 100644
--- a/tests/components/lametric/test_number.py
+++ b/tests/components/lametric/test_number.py
@@ -2,18 +2,20 @@
 from unittest.mock import MagicMock
 
 from homeassistant.components.lametric.const import DOMAIN
-from homeassistant.components.number import DOMAIN as NUMBER_DOMAIN, SERVICE_SET_VALUE
-from homeassistant.components.number.const import (
+from homeassistant.components.number import (
     ATTR_MAX,
     ATTR_MIN,
     ATTR_STEP,
     ATTR_VALUE,
+    DOMAIN as NUMBER_DOMAIN,
+    SERVICE_SET_VALUE,
 )
 from homeassistant.const import (
     ATTR_DEVICE_CLASS,
     ATTR_ENTITY_ID,
     ATTR_FRIENDLY_NAME,
     ATTR_ICON,
+    ATTR_UNIT_OF_MEASUREMENT,
 )
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers import device_registry as dr, entity_registry as er
@@ -22,6 +24,58 @@ from homeassistant.helpers.entity import EntityCategory
 from tests.common import MockConfigEntry
 
 
+async def test_brightness(
+    hass: HomeAssistant,
+    init_integration: MockConfigEntry,
+    mock_lametric: MagicMock,
+) -> None:
+    """Test the LaMetric display brightness controls."""
+    device_registry = dr.async_get(hass)
+    entity_registry = er.async_get(hass)
+
+    state = hass.states.get("number.frenck_s_lametric_brightness")
+    assert state
+    assert state.attributes.get(ATTR_DEVICE_CLASS) is None
+    assert state.attributes.get(ATTR_FRIENDLY_NAME) == "Frenck's LaMetric Brightness"
+    assert state.attributes.get(ATTR_ICON) == "mdi:brightness-6"
+    assert state.attributes.get(ATTR_MAX) == 100
+    assert state.attributes.get(ATTR_MIN) == 0
+    assert state.attributes.get(ATTR_STEP) == 1
+    assert state.attributes.get(ATTR_UNIT_OF_MEASUREMENT) == "%"
+    assert state.state == "100"
+
+    entry = entity_registry.async_get(state.entity_id)
+    assert entry
+    assert entry.device_id
+    assert entry.entity_category is EntityCategory.CONFIG
+    assert entry.unique_id == "SA110405124500W00BS9-brightness"
+
+    device = device_registry.async_get(entry.device_id)
+    assert device
+    assert device.configuration_url is None
+    assert device.connections == {(dr.CONNECTION_NETWORK_MAC, "aa:bb:cc:dd:ee:ff")}
+    assert device.entry_type is None
+    assert device.hw_version is None
+    assert device.identifiers == {(DOMAIN, "SA110405124500W00BS9")}
+    assert device.manufacturer == "LaMetric Inc."
+    assert device.name == "Frenck's LaMetric"
+    assert device.sw_version == "2.2.2"
+
+    await hass.services.async_call(
+        NUMBER_DOMAIN,
+        SERVICE_SET_VALUE,
+        {
+            ATTR_ENTITY_ID: "number.frenck_s_lametric_brightness",
+            ATTR_VALUE: 21,
+        },
+        blocking=True,
+    )
+    await hass.async_block_till_done()
+
+    assert len(mock_lametric.display.mock_calls) == 1
+    mock_lametric.display.assert_called_once_with(brightness=21)
+
+
 async def test_volume(
     hass: HomeAssistant,
     init_integration: MockConfigEntry,