"Put out the lights" is a common phrase used to signify the end of the day or to request that someone turn off the lights. However, if you want to switch up your language, there are plenty of synonym alternatives to choose from. For example, you could tell someone to "extinguish the lights," "dim the lights," "switch off the lights," "shut down the lights," or "power down the lights." Each of these synonyms can be used interchangeably, and choosing different words can add variation and style to your communication. Whatever synonym you choose, just make sure to communicate clearly so that the person you're speaking with knows exactly what you want them to do.