Trigger Rule when Thing initializes?

Setup, Configuration and Use Scripts & Rules
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I have two LIFX bulbs that are on a physical switch in my home, and a third that is also in the same room on a different switch.

I am turning the two bulbs on with the physical switch like so:

  • LIFX bulbs are off via OpenHab, physical switch is on
  • Flip switch to off, LIFX bulbs lose power
  • Flip switch to on, LIFX bulbs regain power and default to on

I’d like to capture the moment when the LIFX bulbs regain power, and setup a rule which switches the third bulb on.

I’ve tried tried monitoring item.lastUpdate and item.state, but neither seem to capture the moment of initialization.

Any suggestions?