diff --git a/homeassistant/components/mqtt/light/schema_basic.py b/homeassistant/components/mqtt/light/schema_basic.py
index d58d52377dd..a4d3ecb5f21 100644
--- a/homeassistant/components/mqtt/light/schema_basic.py
+++ b/homeassistant/components/mqtt/light/schema_basic.py
@@ -261,8 +261,16 @@ class MqttLight(MqttEntity, LightEntity, RestoreEntity):
 
     def _setup_from_config(self, config: ConfigType) -> None:
         """(Re)Setup the entity."""
-        self._attr_min_mireds = config.get(CONF_MIN_MIREDS, super().min_mireds)
-        self._attr_max_mireds = config.get(CONF_MAX_MIREDS, super().max_mireds)
+        self._attr_min_color_temp_kelvin = (
+            color_util.color_temperature_mired_to_kelvin(max_mireds)
+            if (max_mireds := config.get(CONF_MAX_MIREDS))
+            else super().min_color_temp_kelvin
+        )
+        self._attr_max_color_temp_kelvin = (
+            color_util.color_temperature_mired_to_kelvin(min_mireds)
+            if (min_mireds := config.get(CONF_MIN_MIREDS))
+            else super().max_color_temp_kelvin
+        )
         self._attr_effect_list = config.get(CONF_EFFECT_LIST)
 
         topic: dict[str, str | None] = {
diff --git a/homeassistant/components/mqtt/light/schema_json.py b/homeassistant/components/mqtt/light/schema_json.py
index 703117190eb..5901967610a 100644
--- a/homeassistant/components/mqtt/light/schema_json.py
+++ b/homeassistant/components/mqtt/light/schema_json.py
@@ -639,7 +639,7 @@ class MqttLightJson(MqttEntity, LightEntity, RestoreEntity):
                 message["color"]["s"] = hs_color[1]
 
             if self._optimistic:
-                self._attr_color_temp = None
+                self._attr_color_temp_kelvin = None
                 self._attr_hs_color = kwargs[ATTR_HS_COLOR]
                 should_update = True