diff --git a/homeassistant/components/lifx/light.py b/homeassistant/components/lifx/light.py
index 3d30fcd369e..7a1b51ac8ae 100644
--- a/homeassistant/components/lifx/light.py
+++ b/homeassistant/components/lifx/light.py
@@ -10,6 +10,9 @@ import aiolifx_effects as aiolifx_effects_module
 import voluptuous as vol
 
 from homeassistant.components.light import (
+    ATTR_BRIGHTNESS,
+    ATTR_BRIGHTNESS_STEP,
+    ATTR_BRIGHTNESS_STEP_PCT,
     ATTR_EFFECT,
     ATTR_TRANSITION,
     LIGHT_TURN_ON_SCHEMA,
@@ -234,6 +237,20 @@ class LIFXLight(LIFXEntity, LightEntity):
         else:
             fade = 0
 
+        if ATTR_BRIGHTNESS_STEP in kwargs or ATTR_BRIGHTNESS_STEP_PCT in kwargs:
+            brightness = self.brightness if self.is_on and self.brightness else 0
+
+            if ATTR_BRIGHTNESS_STEP in kwargs:
+                brightness += kwargs.pop(ATTR_BRIGHTNESS_STEP)
+
+            else:
+                brightness_pct = round(brightness / 255 * 100)
+                brightness = round(
+                    (brightness_pct + kwargs.pop(ATTR_BRIGHTNESS_STEP_PCT)) / 100 * 255
+                )
+
+            kwargs[ATTR_BRIGHTNESS] = max(0, min(255, brightness))
+
         # These are both False if ATTR_POWER is not set
         power_on = kwargs.get(ATTR_POWER, False)
         power_off = not kwargs.get(ATTR_POWER, True)
diff --git a/tests/components/lifx/test_light.py b/tests/components/lifx/test_light.py
index d66908c1b1a..edb13c259e8 100644
--- a/tests/components/lifx/test_light.py
+++ b/tests/components/lifx/test_light.py
@@ -30,6 +30,8 @@ from homeassistant.components.lifx.manager import (
 from homeassistant.components.light import (
     ATTR_BRIGHTNESS,
     ATTR_BRIGHTNESS_PCT,
+    ATTR_BRIGHTNESS_STEP,
+    ATTR_BRIGHTNESS_STEP_PCT,
     ATTR_COLOR_MODE,
     ATTR_COLOR_NAME,
     ATTR_COLOR_TEMP_KELVIN,
@@ -1735,6 +1737,48 @@ async def test_transitions_color_bulb(hass: HomeAssistant) -> None:
     bulb.set_color.reset_mock()
 
 
+async def test_lifx_set_state_brightness(hass: HomeAssistant) -> None:
+    """Test lifx.set_state works with brightness, brightness_pct and brightness_step."""
+    config_entry = MockConfigEntry(
+        domain=DOMAIN, data={CONF_HOST: "127.0.0.1"}, unique_id=SERIAL
+    )
+    config_entry.add_to_hass(hass)
+    bulb = _mocked_bulb_new_firmware()
+    bulb.power_level = 65535
+    bulb.color = [0, 0, 32768, 3500]
+    with (
+        _patch_discovery(device=bulb),
+        _patch_config_flow_try_connect(device=bulb),
+        _patch_device(device=bulb),
+    ):
+        await async_setup_component(hass, lifx.DOMAIN, {lifx.DOMAIN: {}})
+        await hass.async_block_till_done()
+
+    entity_id = "light.my_bulb"
+
+    # brightness_step should convert from 8 bit to 16 bit
+    await hass.services.async_call(
+        DOMAIN,
+        "set_state",
+        {ATTR_ENTITY_ID: entity_id, ATTR_BRIGHTNESS_STEP: 128},
+        blocking=True,
+    )
+
+    assert bulb.set_color.calls[0][0][0] == [0, 0, 65535, 3500]
+    bulb.set_color.reset_mock()
+
+    # brightness_step_pct should convert from percentage to 16 bit
+    await hass.services.async_call(
+        DOMAIN,
+        "set_state",
+        {ATTR_ENTITY_ID: entity_id, ATTR_BRIGHTNESS_STEP_PCT: 50},
+        blocking=True,
+    )
+
+    assert bulb.set_color.calls[0][0][0] == [0, 0, 65535, 3500]
+    bulb.set_color.reset_mock()
+
+
 async def test_lifx_set_state_color(hass: HomeAssistant) -> None:
     """Test lifx.set_state works with color names and RGB."""
     config_entry = MockConfigEntry(