diff --git a/homeassistant/components/blinksticklight/light.py b/homeassistant/components/blinksticklight/light.py
index 621bd01f874..8373d2990a1 100644
--- a/homeassistant/components/blinksticklight/light.py
+++ b/homeassistant/components/blinksticklight/light.py
@@ -1,6 +1,8 @@
 """Support for Blinkstick lights."""
 from __future__ import annotations
 
+from typing import Any
+
 from blinkstick import blinkstick
 import voluptuous as vol
 
@@ -57,15 +59,15 @@ class BlinkStickLight(LightEntity):
         self._stick = stick
         self._attr_name = name
 
-    def update(self):
+    def update(self) -> None:
         """Read back the device state."""
         rgb_color = self._stick.get_color()
         hsv = color_util.color_RGB_to_hsv(*rgb_color)
         self._attr_hs_color = hsv[:2]
-        self._attr_brightness = hsv[2]
-        self._attr_is_on = self.brightness > 0
+        self._attr_brightness = int(hsv[2])
+        self._attr_is_on = self.brightness is not None and self.brightness > 0
 
-    def turn_on(self, **kwargs):
+    def turn_on(self, **kwargs: Any) -> None:
         """Turn the device on."""
         if ATTR_HS_COLOR in kwargs:
             self._attr_hs_color = kwargs[ATTR_HS_COLOR]
@@ -73,13 +75,15 @@ class BlinkStickLight(LightEntity):
             self._attr_brightness = kwargs[ATTR_BRIGHTNESS]
         else:
             self._attr_brightness = 255
+        assert self.brightness is not None
         self._attr_is_on = self.brightness > 0
 
+        assert self.hs_color
         rgb_color = color_util.color_hsv_to_RGB(
             self.hs_color[0], self.hs_color[1], self.brightness / 255 * 100
         )
         self._stick.set_color(red=rgb_color[0], green=rgb_color[1], blue=rgb_color[2])
 
-    def turn_off(self, **kwargs):
+    def turn_off(self, **kwargs: Any) -> None:
         """Turn the device off."""
         self._stick.turn_off()