diff --git a/homeassistant/components/lutron/light.py b/homeassistant/components/lutron/light.py
index 18b5edd10396b9..eb003fd431ab66 100644
--- a/homeassistant/components/lutron/light.py
+++ b/homeassistant/components/lutron/light.py
@@ -141,7 +141,7 @@ def turn_on(self, **kwargs: Any) -> None:
             else:
                 brightness = self._prev_brightness
             self._prev_brightness = brightness
-            args = {"new_level": brightness}
+            args = {"new_level": to_lutron_level(brightness)}
             if ATTR_TRANSITION in kwargs:
                 args["fade_time_seconds"] = kwargs[ATTR_TRANSITION]
             self._lutron_device.set_level(**args)