I have mostly LIFX bulbs and noticed that when power returns after power outages they are all ON - is there a power restore state setting for LIFX bulbs like some of the others bulbs I have seen?
This is not currently a LIFX feature and depending on the age of the bulb it never will be. For the few LIFX bulbs that aren’t on a smart switch i use an automation that detects that power has been restored and turns the lights back off.
How do you detect power has been restored after an outage?
Lots of different ways that the community does this. Here are a few.
https://community.hubitat.com/search?q=detect%20power%20outage%20order%3Alatest
As a last resort I checked in the LIFX app - no luck.
I'll be checking on power restore options 
What firmware are your LIFX bulbs? Most should have the feature in the app (https://support.lifx.com/hc/en-us/articles/37787076098071-Light-Restore-What-happens-after-power-changes).