Automate turn off lights after power outage and HA server restart

Configuration
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1

So I have this issue that happens neraly twice a week. At my location there are power outages that last for like 2 seconds. Since I have lights that don’t support last state behaviour, they all turn on after power is restored. I wish to write an automation that will change those lights to their last known state (or just turn off those lights).

I don’t have UPS, so my server and HA also restart. I wonder how to solve this issue and have come up with this idea:

When HA turns on (some state that identifies that HA is powered on) it turns off all lights. How could I do that, so that my house doesn’t lit up? I have ikea tradfri bulbs that don’t have the “power restore” function so this is happening for them. I also have philips hue lights, that have the “power restore” function and they properly turn to their last state (mostly off) during the power restore.

2

There is an automation trigger ‘home assistant’ which can fire when HA is powered up.

3

Thanks. It seems to be working, I tried restarting HASS and lights turned off with a delay (I thought there is a need for it to be sure that every light connected properly). This isn’t the most ideal way, but unless someone comes up with better idea, I will stick with that. Here’s my config:

- alias: HA startup
  trigger:
    platform: homeassistant
    event: start
  action:
  - delay: 00:01:00
  - service: light.turn_off
    data:
      entity_id: group.ikea_lights_all
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