Add set_zones service to flux_led (#20584)

Co-authored-by: Franck Nijhof <git@frenck.dev>

source/_integrations/flux_led.markdown

@@ -193,3 +193,30 @@ colors:
 speed_pct: 80
 transition: "jump"
 ```
+
+### Set Zones - Service `flux_led.set_zones`
+
+The Addressable v3 (0xA3) models allow setting a color effect per zone. The length of each zone is the number of pixels per segment divided by the number of colors. If the device is turned off, setting the zones will not turn it on. A separate call to `light.turn_on` is needed to turn on the device.
+
+| Service data attribute | Description |
+| ---------------------- | ----------- |
+| `entity_id` | The entity_id of the LED light to set the effect on. |
+| `colors` | List of colors for each zone (RGB). (Max 2048 Colors) |
+| `speed_pct` | The speed of the effect in % (0-100. Default 50) |
+| `effect` | The effect you would like. Valid options are `static`, `running_water`, `strobe`, `jump`, or `breathing`. (Default `static`) |
+
+```yaml
+#Example Service Call
+service: flux_led.set_zones
+target:
+  entity_id:
+    - light.addressable_v3_8e2f7f
+    - light.addressable_v3_8ebdeb
+data:
+  colors:
+    - [255, 0, 0]
+    - [0, 255, 0]
+    - [0, 0, 255]
+    - [255, 255, 255]
+  speed_pct: 80
+```