Set zones

The Set zones action assigns a color to each zone of an Addressable v3 (0xA3) light strip. The length of each zone is the number of pixels per segment divided by the number of colors you provide.

This is handy for splitting a single strip into sections, for example lighting one part of a shelf red and another part blue.

Using this action from the user interface

If you prefer building automations and scripts visually, Home Assistant walks you through this action step by step. You pick what to target, tweak a few options, and save. No YAML knowledge required.

To set strip zones from an automation or a script:

1. Go to Settings > Automations & scenes.
2. Open an existing automation or script, or select Create automation > Create new automation.
3. If you’re setting up a new automation, add a trigger in the When section. Scripts don’t need a trigger. They run when something else calls them.
4. In the Then do section, select Add action.
5. From the search box, search for and select Magic Home: Set zones.
6. Under Targets, choose the lights to apply the zones to.
7. Enter the Colors, and optionally a Speed and Effect.
8. Select Save.

Targets of the action

This action requires a target. The target is the object of the action. You can point the action at a single entityAn entity represents a sensor, actor, or function in Home Assistant. Entities are used to monitor physical properties or to control other entities. An entity is usually part of a device or a service. [Learn more], a device, an area, a floor, or a label, and Home Assistant will run the action on every matching light entity behind that target.

• Entity: one specific light entity, such as light.living_room.
• Device: every light entity that belongs to a device.
• Area: every light entity in a room or area.
• Floor: every light entity on a floor.
• Label: every light entity that shares a label.

You can also select different target types in one action. For example, you can add a specific entity and an area as targets in the same action to run the action on both of them at once.

Options in the UI

Using this action in YAML

If you work directly in YAML, or you want to know exactly what Home Assistant does under the hood, this section has the technical reference. It lists the field names you use in YAML, their types, and which ones are required.

In YAML, refer to this action as flux_led.set_zones. A basic example looks like this:

action: flux_led.set_zones
target:
  entity_id: light.addressable_v3_8e2f7f
data:
  colors:
    - [255, 0, 0]
    - [0, 255, 0]
    - [0, 0, 255]
    - [255, 255, 255]
  speed_pct: 80

Options in YAML

Good to know

• If the light is off, setting zones does not turn it on. Turn the light on separately to see the effects of this action.

Try it yourself

Ready to test this? Open Developer tools > Actions, search for this action, fill in the fields, and select Perform action. You see what happens on your actual entitiesAn entity represents a sensor, actor, or function in Home Assistant. Entities are used to monitor physical properties or to control other entities. An entity is usually part of a device or a service. [Learn more] without writing a line of YAML.

More examples

Real scenarios where this action shows up in automations and scripts. Copy any example and adapt it to your setup.

Automation: highlight only the active desk zone to avoid lighting the whole strip

When someone sits down at the desk, set only the zone above the desk to a neutral white and leave the rest of the strip off. This avoids powering the full strip when only a small area needs illumination.

• Trigger: Binary sensor turns on (desk occupancy sensor)
• Action: Magic Home: Set zones

alias: ""Light only the desk zone when occupied"
triggers:
- trigger: state
  entity_id: binary_sensor.desk_occupancy
  to: "on"
actions:
- action: flux_led.set_zones
  target:
    entity_id: light.addressable_v3_desk
  data:
    colors:
      - [0, 0, 0]
      - [200, 200, 180]
      - [0, 0, 0]
    speed_pct: 0
    effect: static

Still stuck?

The Home Assistant community is quick to help: join Discord for real-time chat, post on the community forum with the action you’re calling and what you expected to happen, or share on our subreddit /r/homeassistant.

Related actions

These actions work well alongside this one:

• Set custom effect: Sets a custom light effect on a Magic Home light.

• Set music mode: Configures music mode on Magic Home lights with a built-in microphone.