diff --git a/homeassistant/components/lw12wifi/light.py b/homeassistant/components/lw12wifi/light.py
index 7814475b41f..9f520a79ae1 100644
--- a/homeassistant/components/lw12wifi/light.py
+++ b/homeassistant/components/lw12wifi/light.py
@@ -116,7 +116,7 @@ class LW12WiFi(LightEntity):
         """Return True if unable to access real state of the entity."""
         return True
 
-    def turn_on(self, **kwargs):
+    def turn_on(self, **kwargs: Any) -> None:
         """Instruct the light to turn on."""
         self._light.light_on()
         if ATTR_HS_COLOR in kwargs:
@@ -124,7 +124,7 @@ class LW12WiFi(LightEntity):
             self._light.set_color(*self._rgb_color)
             self._effect = None
         if ATTR_BRIGHTNESS in kwargs:
-            self._brightness = kwargs.get(ATTR_BRIGHTNESS)
+            self._brightness = kwargs[ATTR_BRIGHTNESS]
             brightness = int(self._brightness / 255 * 100)
             self._light.set_light_option(lw12.LW12_LIGHT.BRIGHTNESS, brightness)
         if ATTR_EFFECT in kwargs: