diff --git a/custom_components/fullykiosk/light.py b/custom_components/fullykiosk/light.py
index 856dc38..695b579 100644
--- a/custom_components/fullykiosk/light.py
+++ b/custom_components/fullykiosk/light.py
@@ -61,9 +61,9 @@ def unique_id(self):
     def turn_on(self, **kwargs):
         self.controller.screenOn()
         brightness = kwargs.get(ATTR_BRIGHTNESS)
-        if brightness == None:
+        if brightness is None:
             return
-        if brightness != self._brightness:
+        if brightness != self.coordinator.data["screenBrightness"]:
             self.controller.setScreenBrightness(brightness)
 
     def turn_off(self, **kwargs):