diff --git a/homeassistant/components/wled/light.py b/homeassistant/components/wled/light.py
index 3d2c9d6ef2c..8bc1a56b205 100644
--- a/homeassistant/components/wled/light.py
+++ b/homeassistant/components/wled/light.py
@@ -10,11 +10,13 @@ from homeassistant.components.light import (
     ATTR_EFFECT,
     ATTR_HS_COLOR,
     ATTR_TRANSITION,
+    ATTR_WHITE_VALUE,
     SUPPORT_BRIGHTNESS,
     SUPPORT_COLOR,
     SUPPORT_COLOR_TEMP,
     SUPPORT_EFFECT,
     SUPPORT_TRANSITION,
+    SUPPORT_WHITE_VALUE,
     Light,
 )
 from homeassistant.config_entries import ConfigEntry
@@ -79,6 +81,7 @@ class WLEDLight(Light, WLEDDeviceEntity):
         self._color: Optional[Tuple[float, float]] = None
         self._effect: Optional[str] = None
         self._state: Optional[bool] = None
+        self._white_value: Optional[int] = None
 
         # Only apply the segment ID if it is not the first segment
         name = wled.device.info.name
@@ -107,10 +110,15 @@ class WLEDLight(Light, WLEDDeviceEntity):
         """Return the brightness of this light between 1..255."""
         return self._brightness
 
+    @property
+    def white_value(self) -> Optional[int]:
+        """Return the white value of this light between 0..255."""
+        return self._white_value
+
     @property
     def supported_features(self) -> int:
         """Flag supported features."""
-        return (
+        flags = (
             SUPPORT_BRIGHTNESS
             | SUPPORT_COLOR
             | SUPPORT_COLOR_TEMP
@@ -118,6 +126,11 @@ class WLEDLight(Light, WLEDDeviceEntity):
             | SUPPORT_TRANSITION
         )
 
+        if self._rgbw:
+            flags |= SUPPORT_WHITE_VALUE
+
+        return flags
+
     @property
     def effect_list(self) -> List[str]:
         """Return the list of supported effects."""
@@ -163,11 +176,21 @@ class WLEDLight(Light, WLEDDeviceEntity):
         if ATTR_EFFECT in kwargs:
             data[ATTR_EFFECT] = kwargs[ATTR_EFFECT]
 
-        # Support for RGBW strips
-        if self._rgbw and any(x in (ATTR_COLOR_TEMP, ATTR_HS_COLOR) for x in kwargs):
-            data[ATTR_COLOR_PRIMARY] = color_util.color_rgb_to_rgbw(
-                *data[ATTR_COLOR_PRIMARY]
-            )
+        # Support for RGBW strips, adds white value
+        if self._rgbw and any(
+            x in (ATTR_COLOR_TEMP, ATTR_HS_COLOR, ATTR_WHITE_VALUE) for x in kwargs
+        ):
+            # WLED cannot just accept a white value, it needs the color.
+            # We use the last know color in case just the white value changes.
+            if not any(x in (ATTR_COLOR_TEMP, ATTR_HS_COLOR) for x in kwargs):
+                hue, sat = self._color
+                data[ATTR_COLOR_PRIMARY] = color_util.color_hsv_to_RGB(hue, sat, 100)
+
+            # Add requested or last known white value
+            if ATTR_WHITE_VALUE in kwargs:
+                data[ATTR_COLOR_PRIMARY] += (kwargs[ATTR_WHITE_VALUE],)
+            else:
+                data[ATTR_COLOR_PRIMARY] += (self._white_value,)
 
         try:
             await self.wled.light(**data)
@@ -186,6 +209,9 @@ class WLEDLight(Light, WLEDDeviceEntity):
             if ATTR_COLOR_TEMP in kwargs:
                 self._color = color_util.color_temperature_to_hs(mireds)
 
+            if ATTR_WHITE_VALUE in kwargs:
+                self._white_value = kwargs[ATTR_WHITE_VALUE]
+
         except WLEDError:
             _LOGGER.error("An error occurred while turning on WLED light.")
             self._available = False
@@ -198,9 +224,9 @@ class WLEDLight(Light, WLEDDeviceEntity):
         self._state = self.wled.device.state.on
 
         color = self.wled.device.state.segments[self._segment].color_primary
+        self._color = color_util.color_RGB_to_hs(*color[:3])
         if self._rgbw:
-            color = color_util.color_rgbw_to_rgb(*color)
-        self._color = color_util.color_RGB_to_hs(*color)
+            self._white_value = color[-1]
 
         playlist = self.wled.device.state.playlist
         if playlist == -1:
diff --git a/tests/components/wled/test_light.py b/tests/components/wled/test_light.py
index 185a25b0507..037081608af 100644
--- a/tests/components/wled/test_light.py
+++ b/tests/components/wled/test_light.py
@@ -8,6 +8,7 @@ from homeassistant.components.light import (
     ATTR_HS_COLOR,
     ATTR_RGB_COLOR,
     ATTR_TRANSITION,
+    ATTR_WHITE_VALUE,
     DOMAIN as LIGHT_DOMAIN,
 )
 from homeassistant.components.wled.const import (
@@ -164,7 +165,8 @@ async def test_rgbw_light(
 
     state = hass.states.get("light.wled_rgbw_light")
     assert state.state == STATE_ON
-    assert state.attributes.get(ATTR_HS_COLOR) == (0.0, 64.706)
+    assert state.attributes.get(ATTR_HS_COLOR) == (0.0, 100.0)
+    assert state.attributes.get(ATTR_WHITE_VALUE) == 139
 
     await hass.services.async_call(
         LIGHT_DOMAIN,
@@ -177,3 +179,17 @@ async def test_rgbw_light(
     state = hass.states.get("light.wled_rgbw_light")
     assert state.state == STATE_ON
     assert state.attributes.get(ATTR_HS_COLOR) == (28.874, 72.522)
+    assert state.attributes.get(ATTR_WHITE_VALUE) == 139
+
+    await hass.services.async_call(
+        LIGHT_DOMAIN,
+        SERVICE_TURN_ON,
+        {ATTR_ENTITY_ID: "light.wled_rgbw_light", ATTR_WHITE_VALUE: 100},
+        blocking=True,
+    )
+    await hass.async_block_till_done()
+
+    state = hass.states.get("light.wled_rgbw_light")
+    assert state.state == STATE_ON
+    assert state.attributes.get(ATTR_HS_COLOR) == (28.874, 72.522)
+    assert state.attributes.get(ATTR_WHITE_VALUE) == 100