My standard take on this is every room that will be occupied should have a switch that will turn on the overhead light no matter what happens to the network in case of an emergency. First responders need an easily understandable switch in case a room fills with smoke or worse.

Smart bulbs are great for secondary lighting like lamps and such, but the main room light should be on a switch.

One option might be a POE to 12/9/5v convertor like this. I use one to run a 12v non-POE switch up in my attic from a basement POE switch.