This is one of the limitations I have found with IFTTTT. I have exterior Lifx lights that are turned on 1 hour before sunset and then off at 11:10 pm. I run this through Apple HomeKit automations.
One of the lights in the mix is my front porch with also has a Ring version 2 doorbell. In IFTTT I have a trigger set up much like the one jymbob described. You are correct that the IFTTT automation for Lifx bulbs is limited to a dimming to off option. I wanted the same thing: on for 10 minutes at 100% then OFF. I can only do a dim over 10 minutes.
The other limitation of IFTTT was that I could not put a time constraint around the trigger that limited it to ONLY trigger between 11:10 pm (when my exterior light shut down) and dawn. That way all my lights stay on until 11:10, and the front porch light is only triggered by motion at night after HomeKit turns it off. Simple set of logical constraints; unfortunately, that is not supported.
So now, all my exterior lights go one hour before sunset (I’ll shorten that in the summer), but as soon Ring detects motion, the porch light starts it’s 10 minute fade cycle. The rest of my outdoor lights stay on.
I describe this limitation as the lack of IFTTT’s ability to nest automations.
Hope this helps. If you find an answer, please let me know.