diff --git a/homeassistant/components/light/__init__.py b/homeassistant/components/light/__init__.py
index dfe2e6909b4..4f3240d7b31 100644
--- a/homeassistant/components/light/__init__.py
+++ b/homeassistant/components/light/__init__.py
@@ -747,7 +747,7 @@ class LightEntity(ToggleEntity):
     _attr_rgb_color: tuple[int, int, int] | None = None
     _attr_rgbw_color: tuple[int, int, int, int] | None = None
     _attr_rgbww_color: tuple[int, int, int, int, int] | None = None
-    _attr_supported_color_modes: set[ColorMode | str] | None = None
+    _attr_supported_color_modes: set[ColorMode] | set[str] | None = None
     _attr_supported_features: int = 0
     _attr_xy_color: tuple[float, float] | None = None
 
@@ -978,32 +978,32 @@ class LightEntity(ToggleEntity):
         return {key: val for key, val in data.items() if val is not None}
 
     @property
-    def _light_internal_supported_color_modes(self) -> set:
+    def _light_internal_supported_color_modes(self) -> set[ColorMode] | set[str]:
         """Calculate supported color modes with backwards compatibility."""
-        supported_color_modes = self.supported_color_modes
+        if self.supported_color_modes is not None:
+            return self.supported_color_modes
 
-        if supported_color_modes is None:
-            # Backwards compatibility for supported_color_modes added in 2021.4
-            # Add warning in 2021.6, remove in 2021.10
-            supported_features = self.supported_features
-            supported_color_modes = set()
+        # Backwards compatibility for supported_color_modes added in 2021.4
+        # Add warning in 2021.6, remove in 2021.10
+        supported_features = self.supported_features
+        supported_color_modes: set[ColorMode] = set()
 
-            if supported_features & SUPPORT_COLOR_TEMP:
-                supported_color_modes.add(ColorMode.COLOR_TEMP)
-            if supported_features & SUPPORT_COLOR:
-                supported_color_modes.add(ColorMode.HS)
-            if supported_features & SUPPORT_WHITE_VALUE:
-                supported_color_modes.add(ColorMode.RGBW)
-            if supported_features & SUPPORT_BRIGHTNESS and not supported_color_modes:
-                supported_color_modes = {ColorMode.BRIGHTNESS}
+        if supported_features & SUPPORT_COLOR_TEMP:
+            supported_color_modes.add(ColorMode.COLOR_TEMP)
+        if supported_features & SUPPORT_COLOR:
+            supported_color_modes.add(ColorMode.HS)
+        if supported_features & SUPPORT_WHITE_VALUE:
+            supported_color_modes.add(ColorMode.RGBW)
+        if supported_features & SUPPORT_BRIGHTNESS and not supported_color_modes:
+            supported_color_modes = {ColorMode.BRIGHTNESS}
 
-            if not supported_color_modes:
-                supported_color_modes = {ColorMode.ONOFF}
+        if not supported_color_modes:
+            supported_color_modes = {ColorMode.ONOFF}
 
         return supported_color_modes
 
     @property
-    def supported_color_modes(self) -> set[ColorMode | str] | None:
+    def supported_color_modes(self) -> set[ColorMode] | set[str] | None:
         """Flag supported color modes."""
         return self._attr_supported_color_modes
 
diff --git a/homeassistant/components/overkiz/light.py b/homeassistant/components/overkiz/light.py
index 77b8f9bad92..0ad6cb0d9c5 100644
--- a/homeassistant/components/overkiz/light.py
+++ b/homeassistant/components/overkiz/light.py
@@ -45,7 +45,7 @@ class OverkizLight(OverkizEntity, LightEntity):
         """Initialize a device."""
         super().__init__(device_url, coordinator)
 
-        self._attr_supported_color_modes = set()
+        self._attr_supported_color_modes: set[ColorMode] = set()
 
         if self.executor.has_command(OverkizCommand.SET_RGB):
             self._attr_supported_color_modes.add(ColorMode.RGB)
diff --git a/homeassistant/components/tradfri/light.py b/homeassistant/components/tradfri/light.py
index 161c7d8f25d..32160c6a130 100644
--- a/homeassistant/components/tradfri/light.py
+++ b/homeassistant/components/tradfri/light.py
@@ -71,7 +71,7 @@ class TradfriLight(TradfriBaseEntity, LightEntity):
         self._hs_color = None
 
         # Calculate supported color modes
-        self._attr_supported_color_modes = set()
+        self._attr_supported_color_modes: set[ColorMode] = set()
         if self._device.light_control.can_set_color:
             self._attr_supported_color_modes.add(ColorMode.HS)
         if self._device.light_control.can_set_temp:
diff --git a/homeassistant/components/tuya/light.py b/homeassistant/components/tuya/light.py
index 6b8329701aa..7ba8acdc0fe 100644
--- a/homeassistant/components/tuya/light.py
+++ b/homeassistant/components/tuya/light.py
@@ -409,7 +409,7 @@ class TuyaLightEntity(TuyaEntity, LightEntity):
         super().__init__(device, device_manager)
         self.entity_description = description
         self._attr_unique_id = f"{super().unique_id}{description.key}"
-        self._attr_supported_color_modes = set()
+        self._attr_supported_color_modes: set[ColorMode] = set()
 
         # Determine DPCodes
         self._color_mode_dpcode = self.find_dpcode(