diff --git a/homeassistant/components/lifx/const.py b/homeassistant/components/lifx/const.py
index f0505f9a4fd..2959f958aab 100644
--- a/homeassistant/components/lifx/const.py
+++ b/homeassistant/components/lifx/const.py
@@ -73,6 +73,3 @@ LIFX_CEILING_PRODUCT_IDS = {176, 177, 201, 202}
 LIFX_128ZONE_CEILING_PRODUCT_IDS = {201, 202}
 
 _LOGGER = logging.getLogger(__package__)
-
-# _ATTR_COLOR_TEMP deprecated - to be removed in 2026.1
-_ATTR_COLOR_TEMP = "color_temp"
diff --git a/homeassistant/components/lifx/manager.py b/homeassistant/components/lifx/manager.py
index e9beb1d8cc7..0cb5e7f56c7 100644
--- a/homeassistant/components/lifx/manager.py
+++ b/homeassistant/components/lifx/manager.py
@@ -33,7 +33,7 @@ from homeassistant.helpers.target import (
     async_extract_referenced_entity_ids,
 )
 
-from .const import _ATTR_COLOR_TEMP, ATTR_THEME, DOMAIN
+from .const import ATTR_THEME, DOMAIN
 from .coordinator import LIFXUpdateCoordinator
 from .util import convert_8_to_16, find_hsbk
 
@@ -135,8 +135,6 @@ LIFX_EFFECT_PULSE_SCHEMA = cv.make_entity_service_schema(
         vol.Exclusive(ATTR_COLOR_TEMP_KELVIN, COLOR_GROUP): vol.All(
             vol.Coerce(int), vol.Range(min=1500, max=9000)
         ),
-        # _ATTR_COLOR_TEMP deprecated - to be removed in 2026.1
-        vol.Exclusive(_ATTR_COLOR_TEMP, COLOR_GROUP): cv.positive_int,
         ATTR_PERIOD: vol.All(vol.Coerce(float), vol.Range(min=0.05)),
         ATTR_CYCLES: vol.All(vol.Coerce(float), vol.Range(min=1)),
         ATTR_MODE: vol.In(PULSE_MODES),
diff --git a/homeassistant/components/lifx/util.py b/homeassistant/components/lifx/util.py
index c99880891d2..4dc498a5ee4 100644
--- a/homeassistant/components/lifx/util.py
+++ b/homeassistant/components/lifx/util.py
@@ -26,7 +26,6 @@ from homeassistant.helpers import device_registry as dr
 from homeassistant.util import color as color_util
 
 from .const import (
-    _ATTR_COLOR_TEMP,
     _LOGGER,
     DEFAULT_ATTEMPTS,
     DOMAIN,
@@ -115,17 +114,6 @@ def find_hsbk(hass: HomeAssistant, **kwargs: Any) -> list[float | int | None] |
         saturation = int(saturation / 100 * 65535)
         kelvin = 3500
 
-    if ATTR_COLOR_TEMP_KELVIN not in kwargs and _ATTR_COLOR_TEMP in kwargs:
-        # added in 2025.1, can be removed in 2026.1
-        _LOGGER.warning(
-            "The 'color_temp' parameter is deprecated. Please use 'color_temp_kelvin' for"
-            " all service calls"
-        )
-        kelvin = color_util.color_temperature_mired_to_kelvin(
-            kwargs.pop(_ATTR_COLOR_TEMP)
-        )
-        saturation = 0
-
     if ATTR_COLOR_TEMP_KELVIN in kwargs:
         kelvin = kwargs.pop(ATTR_COLOR_TEMP_KELVIN)
         saturation = 0
diff --git a/tests/components/lifx/test_light.py b/tests/components/lifx/test_light.py
index 636ec87dee4..c520df3832f 100644
--- a/tests/components/lifx/test_light.py
+++ b/tests/components/lifx/test_light.py
@@ -9,7 +9,7 @@ import pytest
 
 from homeassistant.components import lifx
 from homeassistant.components.lifx import DOMAIN
-from homeassistant.components.lifx.const import _ATTR_COLOR_TEMP, ATTR_POWER
+from homeassistant.components.lifx.const import ATTR_POWER
 from homeassistant.components.lifx.light import ATTR_INFRARED, ATTR_ZONES
 from homeassistant.components.lifx.manager import (
     ATTR_CLOUD_SATURATION_MAX,
@@ -1900,15 +1900,6 @@ async def test_lifx_set_state_kelvin(hass: HomeAssistant) -> None:
     assert bulb.set_color.calls[0][0][0] == [32000, 0, 25700, 2700]
     bulb.set_color.reset_mock()
 
-    await hass.services.async_call(
-        DOMAIN,
-        "set_state",
-        {ATTR_ENTITY_ID: entity_id, ATTR_BRIGHTNESS: 255, _ATTR_COLOR_TEMP: 400},
-        blocking=True,
-    )
-    assert bulb.set_color.calls[0][0][0] == [32000, 0, 65535, 2500]
-    bulb.set_color.reset_mock()
-
 
 async def test_infrared_color_bulb(hass: HomeAssistant) -> None:
     """Test setting infrared with a color bulb."""