diff --git a/homeassistant/components/light/__init__.py b/homeassistant/components/light/__init__.py
index 10463172700..5855dbfe1c2 100644
--- a/homeassistant/components/light/__init__.py
+++ b/homeassistant/components/light/__init__.py
@@ -993,26 +993,13 @@ class LightEntity(ToggleEntity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
         supported_color_modes: set[ColorMode],
     ) -> None:
         """Validate the supported color modes."""
-        if self.__color_mode_reported:
-            return
-
         try:
             valid_supported_color_modes(supported_color_modes)
-        except vol.Error:
-            # Warning added in 2024.3, reject in 2025.3
-            if not self.__color_mode_reported and self.__should_report_light_issue():
-                self.__color_mode_reported = True
-                report_issue = self._suggest_report_issue()
-                _LOGGER.warning(
-                    (
-                        "%s (%s) sets invalid supported color modes %s, this will stop "
-                        "working in Home Assistant Core 2025.3, please %s"
-                    ),
-                    self.entity_id,
-                    type(self),
-                    supported_color_modes,
-                    report_issue,
-                )
+        except vol.Error as err:
+            raise HomeAssistantError(
+                f"{self.entity_id} ({type(self)}) sets invalid supported color modes "
+                f"{supported_color_modes}"
+            ) from err
 
     @final
     @property
diff --git a/tests/components/light/test_init.py b/tests/components/light/test_init.py
index 08f6021d851..1b06c152867 100644
--- a/tests/components/light/test_init.py
+++ b/tests/components/light/test_init.py
@@ -2438,7 +2438,7 @@ async def test_report_invalid_color_mode(
 
 
 @pytest.mark.parametrize(
-    ("color_mode", "supported_color_modes", "platform_name", "warning_expected"),
+    ("color_mode", "supported_color_modes", "platform_name", "error_expected"),
     [
         (
             light.ColorMode.ONOFF,
@@ -2464,12 +2464,6 @@ async def test_report_invalid_color_mode(
             "test",
             False,
         ),
-        (
-            light.ColorMode.ONOFF,
-            {light.ColorMode.ONOFF, light.ColorMode.BRIGHTNESS},
-            "philips_js",  # We don't log issues for philips_js
-            False,
-        ),
     ],
 )
 def test_report_invalid_color_modes(
@@ -2478,7 +2472,7 @@ def test_report_invalid_color_modes(
     color_mode: str,
     supported_color_modes: set[str],
     platform_name: str,
-    warning_expected: bool,
+    error_expected: bool,
 ) -> None:
     """Test a light setting an invalid color mode."""
 
@@ -2490,9 +2484,13 @@ def test_report_invalid_color_modes(
         platform = MockEntityPlatform(hass, platform_name=platform_name)
 
     entity = MockLightEntityEntity()
-    entity._async_calculate_state()
-    expected_warning = "sets invalid supported color modes"
-    assert (expected_warning in caplog.text) is warning_expected
+    raised_error = ""
+    try:
+        entity._async_calculate_state()
+    except HomeAssistantError as err:
+        raised_error = str(err)
+    expected_error = "sets invalid supported color modes"
+    assert (expected_error in raised_error) is error_expected
 
 
 @pytest.mark.parametrize(