The plugin will turn on the LifX light when the print starts and will turn it off when it ends.
Install manually for now by going to Settings/Plugin Manager/Get More. Enter the URL below into the ...from URL box and click Install.
https://github.com/rgelb/OctoPrint-LifxSwitch-Plugin/archive/master.zip
Go to LIFX Cloud, obtain Access Token and Light ID and enter them into the Lifx Switch section of the Setting screen.