Improve precision of Hue color state

homeassistant/components/light/hue.py

@@ -242,26 +242,16 @@ def _color_mode(self):
     @property
     def hs_color(self):
         """Return the hs color value."""
-        # pylint: disable=redefined-outer-name
         mode = self._color_mode
-
-        if mode not in ('hs', 'xy'):
-            return
-
         source = self.light.action if self.is_group else self.light.state
 
-        hue = source.get('hue')
-        sat = source.get('sat')
+        if mode == 'xy' and 'xy' in source:
+            return color.color_xy_to_hs(*source['xy'])
 
-        # Sometimes the state will not include valid hue/sat values.
-        # Reported as issue 13434
-        if hue is not None and sat is not None:
-            return hue / 65535 * 360, sat / 255 * 100
-
-        if 'xy' not in source:
-            return None
+        if mode == 'hs' and 'hue' in source and 'sat' in source:
+            return source['hue'] / 65535 * 360, source['sat'] / 255 * 100
 
-        return color.color_xy_to_hs(*source['xy'])
+        return None
 
     @property
     def color_temp(self):

tests/components/light/test_hue.py

@@ -237,7 +237,7 @@ async def test_lights(hass, mock_bridge):
     assert lamp_1 is not None
     assert lamp_1.state == 'on'
     assert lamp_1.attributes['brightness'] == 144
-    assert lamp_1.attributes['hs_color'] == (71.896, 83.137)
+    assert lamp_1.attributes['hs_color'] == (36.067, 69.804)
 
     lamp_2 = hass.states.get('light.hue_lamp_2')
     assert lamp_2 is not None
@@ -253,7 +253,7 @@ async def test_lights_color_mode(hass, mock_bridge):
     assert lamp_1 is not None
     assert lamp_1.state == 'on'
     assert lamp_1.attributes['brightness'] == 144
-    assert lamp_1.attributes['hs_color'] == (71.896, 83.137)
+    assert lamp_1.attributes['hs_color'] == (36.067, 69.804)
     assert 'color_temp' not in lamp_1.attributes
 
     new_light1_on = LIGHT_1_ON.copy()
@@ -668,19 +668,6 @@ def test_hs_color():
             'colormode': 'xy',
             'hue': 1234,
             'sat': 123,
-        }),
-        request_bridge_update=None,
-        bridge=Mock(),
-        is_group=False,
-    )
-
-    assert light.hs_color == (1234 / 65535 * 360, 123 / 255 * 100)
-
-    light = hue_light.HueLight(
-        light=Mock(state={
-            'colormode': 'xy',
-            'hue': None,
-            'sat': 123,
             'xy': [0.4, 0.5]
         }),
         request_bridge_update=None,