How to target multiple entities based on their state

[HarvsG]

I vary the colour temperature of my bulbs over the course of the day from the value of a template entity that I use.

At the moment I use node red to target all bulbs that are on. I want to replicate this behaviour in HA automations.

How can I apply an action to all lights that are on?

Similarly when a light turns on I want that to trigger an automation that updates it’s colour temperature. How do I trigger when any light turns on and then use that triggering ID in the action?

Only trigger group members that need to be triggered

Here’s just some templates I’m using in my automations for similar situations. For inspiration. This value template counts the number of lights in a group that are turned on (or off if you change it just a tiny bit). You can use this in a condition of an automation: value_template: > {{ states | selectattr('entity_id', 'in', state_attr('group.colortemplights', 'entity_id')) | selectattr('state', 'equalto', 'on') | map(attribute='entity_id')|list|count > 0}} In the action part of…

Dimming only lights that on

if you just want to dim lights that are currently on with a button press via a script, this would be the action. increase brightness by 5 service: light.turn_on data_template: entity_id: > {{ states.light | selectattr('state','eq','on') | map(attribute='entity_id') | list | join(', ') }} brightnes: > {% set current_levels = states.light | selectattr('state','eq','on') | map(attribute='attributes.brightness') | list %} {% set current_avg = current_levels | sum / c…

[HarvsG]

Looks as if {{'light.none, ' ~ (states.light | selectattr('state','eq','on') | map(attribute='entity_id') | list | join(', ')) }} may do the trick

[petro]

All you need is

target:
  entity_id: >
    {{ states.light | selectattr('state','eq','on') | map(attribute='entity_id') | list }} 

[HarvsG]

If no lights are on, and therefore evaluates to '"", is it true that it will target all lights?

[petro]

it will evaluate to [], but you should put a condition in place to do nothing if all the lights are off prior to running that service. You don’t want to run the service with a fake light, that’s just unnecessary.