Hi Greg Buchanan, thank you for sharing your query.
You can try resetting LIFX bulb to solve the issue.
Sometimes, even after resetting LIFX bulb, it may not appear in the network list.
To solve this issue, you can try a few steps, but the solution for each LIFX model may differ slightly. Hence, we would request you to visit https://support.lifx.com/hc/en-us/articles/202442544-My-Light-does-not-appear-in-my-network-list to follow the relevant steps for the LIFX smart light you are wanting to setup.
Hope this solves your query.
Please feel free to reach out to us in case you have any more questions.
Happy smart living :)