diff --git a/homeassistant/components/knx/light.py b/homeassistant/components/knx/light.py
index a2ce8f8d2cb..0caa3f0a799 100644
--- a/homeassistant/components/knx/light.py
+++ b/homeassistant/components/knx/light.py
@@ -226,7 +226,7 @@ def _create_ui_light(xknx: XKNX, knx_config: ConfigType, name: str) -> XknxLight
     group_address_color_temp_state = None
     color_temperature_type = ColorTemperatureType.UINT_2_BYTE
     if ga_color_temp := knx_config.get(CONF_GA_COLOR_TEMP):
-        if ga_color_temp[CONF_DPT] == ColorTempModes.RELATIVE:
+        if ga_color_temp[CONF_DPT] == ColorTempModes.RELATIVE.value:
             group_address_tunable_white = ga_color_temp[CONF_GA_WRITE]
             group_address_tunable_white_state = [
                 ga_color_temp[CONF_GA_STATE],
@@ -239,7 +239,7 @@ def _create_ui_light(xknx: XKNX, knx_config: ConfigType, name: str) -> XknxLight
                 ga_color_temp[CONF_GA_STATE],
                 *ga_color_temp[CONF_GA_PASSIVE],
             ]
-            if ga_color_temp[CONF_DPT] == ColorTempModes.ABSOLUTE_FLOAT:
+            if ga_color_temp[CONF_DPT] == ColorTempModes.ABSOLUTE_FLOAT.value:
                 color_temperature_type = ColorTemperatureType.FLOAT_2_BYTE
 
     _color_dpt = get_dpt(CONF_GA_COLOR)
diff --git a/tests/components/knx/test_light.py b/tests/components/knx/test_light.py
index 04f849bb555..e2e4a673a0d 100644
--- a/tests/components/knx/test_light.py
+++ b/tests/components/knx/test_light.py
@@ -5,6 +5,7 @@ from __future__ import annotations
 from datetime import timedelta
 
 from freezegun.api import FrozenDateTimeFactory
+import pytest
 from xknx.core import XknxConnectionState
 from xknx.devices.light import Light as XknxLight
 
@@ -1174,3 +1175,46 @@ async def test_light_ui_create(
     await knx.receive_response("2/2/2", True)
     state = hass.states.get("light.test")
     assert state.state is STATE_ON
+
+
+@pytest.mark.parametrize(
+    ("color_temp_mode", "raw_ct"),
+    [
+        ("7.600", (0x10, 0x68)),
+        ("9", (0x46, 0x69)),
+        ("5.001", (0x74,)),
+    ],
+)
+async def test_light_ui_color_temp(
+    hass: HomeAssistant,
+    knx: KNXTestKit,
+    create_ui_entity: KnxEntityGenerator,
+    color_temp_mode: str,
+    raw_ct: tuple[int, ...],
+) -> None:
+    """Test creating a switch."""
+    await knx.setup_integration({})
+    await create_ui_entity(
+        platform=Platform.LIGHT,
+        entity_data={"name": "test"},
+        knx_data={
+            "ga_switch": {"write": "1/1/1", "state": "2/2/2"},
+            "ga_color_temp": {
+                "write": "3/3/3",
+                "dpt": color_temp_mode,
+            },
+            "_light_color_mode_schema": "default",
+            "sync_state": True,
+        },
+    )
+    await knx.assert_read("2/2/2", True)
+    await hass.services.async_call(
+        "light",
+        "turn_on",
+        {"entity_id": "light.test", ATTR_COLOR_TEMP_KELVIN: 4200},
+        blocking=True,
+    )
+    await knx.assert_write("3/3/3", raw_ct)
+    state = hass.states.get("light.test")
+    assert state.state is STATE_ON
+    assert state.attributes[ATTR_COLOR_TEMP_KELVIN] == pytest.approx(4200, abs=1)