home-assistant.io/source/_integrations/light.template.markdown

title, description, ha_category, ha_release, ha_iot_class, ha_quality_scale, ha_domain

title	description	ha_category	ha_release	ha_iot_class	ha_quality_scale	ha_domain
Template Light	Instructions on how to integrate Template Lights into Home Assistant.	Light	0.46	Local Push	internal	template

The template platform creates lights that combine integrations and provides the ability to run scripts or invoke services for each of the on, off, and brightness commands of a light.

To enable Template Lights in your installation, add the following to your configuration.yaml file:

{% raw %}

# Example configuration.yaml entry
light:
  - platform: template
    lights:
      theater_lights:
        friendly_name: "Theater Lights"
        level_template: "{{ state_attr('sensor.theater_brightness', 'lux')|int }}"
        value_template: "{{ state_attr('sensor.theater_brightness', 'lux')|int > 0 }}"
        temperature_template: "{{states('input_number.temperature_input') | int}}"
        color_template: "({{states('input_number.h_input') | int}}, {{states('input_number.s_input') | int}})"
        effect_list_template: "{{ state_attr('light.led_strip', 'effect_list') }}"
        turn_on:
          service: script.theater_lights_on
        turn_off:
          service: script.theater_lights_off
        set_level:
          service: script.theater_lights_level
          data:
            brightness: "{{ brightness }}"
        set_temperature:
          service: input_number.set_value
          data:
            value: "{{ color_temp }}"
            entity_id: input_number.temperature_input
        set_white_value:
          service: input_number.set_value
          data:
            value: "{{ white_value }}"
            entity_id: input_number.white_value_input
        set_color:
          - service: input_number.set_value
            data:
              value: "{{ h }}"
              entity_id: input_number.h_input
          - service: input_number.set_value
            data:
              value: "{{ s }}"
              entity_id: input_number.s_input
          - service: light.turn_on
            data_template:
              entity_id:
                - light.led_strip
              transition: "{{ transition | float }}"
              hs_color:
                - "{{ hs[0] }}"
                - "{{ hs[1] }}"
        set_effect:
          - service: light.turn_on
            data_template:
              entity_id:
                - light.led_strip
              effect: "{{ effect }}"
        supports_transition_template: "{{ true }}"

{% endraw %}

{% configuration %} lights: description: List of your lights. required: true type: map keys: friendly_name: description: Name to use in the frontend. required: false type: string unique_id: description: An ID that uniquely identifies this light. Set this to a unique value to allow customization through the UI. required: false type: string value_template: description: Defines a template to get the state of the light. required: false type: template default: optimistic level_template: description: Defines a template to get the brightness of the light. required: false type: template default: optimistic temperature_template: description: Defines a template to get the color temperature of the light. required: false type: template default: optimistic white_value_template: description: Defines a template to get the white value of the light. required: false type: template default: optimistic color_template: description: Defines a template to get the color of the light. Must render a tuple (hue, saturation) required: false type: template default: optimistic supports_transition_template: description: Defines a template to get if light supports transition. Should return boolean value (True/False). If this value is True transition parameter in a turn on or turn off call will be passed as a named parameter transition to either of the scripts. required: false type: template default: false effect_list_template: description: Defines a template to get the list of supported effects. Must render a list required: inclusive type: template default: optimistic effect_template: description: Defines a template to get the effect of the light. required: inclusive type: template default: optimistic min_mireds_template: description: Defines a template to get the min mireds value of the light. required: false type: template default: optimistic max_mireds_template: description: Defines a template to get the max mireds value of the light. required: false type: template default: optimistic icon_template: description: Defines a template for an icon or picture, e.g., showing a different icon for different states. required: false type: template availability_template: description: Defines a template to get the available state of the entity. If the template either fails to render or returns True, "1", "true", "yes", "on", "enable", or a non-zero number, the entity will be available. If the template returns any other value, the entity will be unavailable. If not configured, the entity will always be available. Note that the string comparison not case sensitive; "TrUe" and "yEs" are allowed. required: false type: template default: true turn_on: description: Defines an action to run when the light is turned on. required: true type: action turn_off: description: Defines an action to run when the light is turned off. required: true type: action set_level: description: Defines an action to run when the light is given a brightness command. The script will only be called if the turn_on call only has brightness, and optionally transition. required: false type: action set_temperature: description: Defines an action to run when the light is given a color temperature command. required: false type: action set_white_value: description: Defines an action to run when the light is given a white value command. required: false type: action set_color: description: Defines an action to run when the light is given a color command. required: false type: action set_effect: description: Defines an action to run when the light is given an effect command. required: inclusive type: action {% endconfiguration %}

Template and action variables

State-based template entities have the special template variable this available in their templates and actions. The this variable aids self-referencing of an entity's state and attribute in templates and actions.

Considerations

If you are using the state of a platform that takes extra time to load, the Template Light may get an unknown state during startup. This results in error messages in your log file until that platform has completed loading. If you use is_state() function in your template, you can avoid this situation. For example, you would replace {% raw %}{{ states.switch.source.state == 'on' }}{% endraw %} with this equivalent that returns true/false and never gives an unknown result: {% raw %}{{ is_state('switch.source', 'on') }}{% endraw %} Transition doesn't have its own script, it will instead be passed as a named parameter transition to the turn_on, turn_off, brightness, color_temp, effect, hs_color or white_value scripts. Brightness will be passed as a named parameter brightness to either of turn_on, color_temp, effect, hs_color or white_value scripts if the corresponding parameter is also in the call. In this case the brightness script (set_level) will not be called. If only brightness is passed to light.turn_on service call then set_level script is called.

Examples

In this section you will find some real-life examples of how to use this light.

Theater Volume Control

This example shows a light that is actually a home theater's volume. This component gives you the flexibility to provide whatever you'd like to send as the payload to the consumer including any scale conversions you may need to make; the Media Player component needs a floating point percentage value from 0.0 to 1.0.

{% raw %}

light:
  - platform: template
    lights:
      theater_volume:
        friendly_name: "Receiver Volume"
        value_template: >-
          {% if is_state('media_player.receiver', 'on') %}
            {% if state_attr('media_player.receiver', 'is_volume_muted') %}
              off
            {% else %}
              on
            {% endif %}
          {% else %}
            off
          {% endif %}
        turn_on:
          service: media_player.volume_mute
          target:
            entity_id: media_player.receiver
          data:
            is_volume_muted: false
        turn_off:
          service: media_player.volume_mute
          target:
            entity_id: media_player.receiver
          data:
            is_volume_muted: true
        set_level:
          service: media_player.volume_set
          target:
            entity_id: media_player.receiver
          data:
            volume_level: "{{ (brightness / 255 * 100)|int / 100 }}"
        level_template: >-
          {% if is_state('media_player.receiver', 'on') %}
            {{ (state_attr('media_player.receiver', 'volume_level')|float * 255)|int }}
          {% else %}
            0
          {% endif %}

{% endraw %}

Change The Icon

This example shows how to change the icon based on the light state.

{% raw %}

light:
  - platform: template
    lights:
      theater_volume:
        friendly_name: "Receiver Volume"
        value_template: >-
          {% if is_state('media_player.receiver', 'on') %}
            {% if state_attr('media_player.receiver', 'is_volume_muted') %}
              off
            {% else %}
              on
            {% endif %}
          {% else %}
            off
          {% endif %}
        icon_template: >-
          {% if is_state('media_player.receiver', 'on') %}
            {% if state_attr('media_player.receiver', 'is_volume_muted') %}
              mdi:lightbulb-off
            {% else %}
              mdi:lightbulb-on
            {% endif %}
          {% else %}
            mdi:lightbulb-off
          {% endif %}
        turn_on:
          service: media_player.volume_mute
          target:
            entity_id: media_player.receiver
          data:
            is_volume_muted: false
        turn_off:
          service: media_player.volume_mute
          target:
            entity_id: media_player.receiver
          data:
            is_volume_muted: true

{% endraw %}

Change The Entity Picture

This example shows how to change the entity picture based on the light state.

{% raw %}

light:
  - platform: template
    lights:
      theater_volume:
        friendly_name: "Receiver Volume"
        value_template: >-
          {% if is_state('media_player.receiver', 'on') %}
            {% if state_attr('media_player.receiver', 'is_volume_muted') %}
              off
            {% else %}
              on
            {% endif %}
          {% else %}
            off
          {% endif %}
        icon_template: >-
          {% if is_state('media_player.receiver', 'on') %}
            {% if state_attr('media_player.receiver', 'is_volume_muted') %}
              /local/lightbulb-off.png
            {% else %}
              /local/lightbulb-on.png
            {% endif %}
          {% else %}
            /local/lightbulb-off.png
          {% endif %}
        turn_on:
          service: media_player.volume_mute
          target:
            entity_id: media_player.receiver
          data:
            is_volume_muted: false
        turn_off:
          service: media_player.volume_mute
          target:
            entity_id: media_player.receiver
          data:
            is_volume_muted: true

{% endraw %}